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|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<!-- SECTION: Programming -->
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<title>HTTP and IPP APIs</title>
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<body>
<div class='body'>
<!--
"$Id: api-httpipp.html 9121 2010-04-23 18:57:00Z mike $"
HTTP and IPP API header for the Common UNIX Printing System (CUPS).
Copyright 2007-2009 by Apple Inc.
Copyright 1997-2006 by Easy Software Products, all rights reserved.
These coded instructions, statements, and computer programs are the
property of Apple Inc. and are protected by Federal copyright
law. Distribution and use rights are outlined in the file "LICENSE.txt"
which should have been included with this file. If this file is
file is missing or damaged, see the license at "http://www.cups.org/".
-->
<h1 class='title'>HTTP and IPP APIs</h1>
<div class='summary'><table summary='General Information'>
<thead>
<tr>
<th>Header</th>
<th>cups/cups.h</th>
</tr>
</thead>
<tbody>
<tr>
<th>Library</th>
<td>-lcups</td>
</tr>
<tr>
<th>See Also</th>
<td>Programming: <a href='api-overview.html'>Introduction to CUPS Programming</a><br>
Programming: <a href='api-cups.html'>CUPS API</a><br>
References: <a href='spec-ipp.html'>CUPS Implementation of IPP</a></td>
</tr>
</tbody>
</table></div>
<h2 class="title">Contents</h2>
<ul class="contents">
<ul class="subcontents">
<li><a href="#OVERVIEW">Overview</a><ul class="subcontents">
<li><a href="#CREATING_URI_STRINGS">Creating URI Strings</a></li>
<li><a href="#SENDING_REQUESTS_WITH_FILES">Sending Requests with Files</a></li>
<li><a href="#ASYNCHRONOUS_REQUEST_PROCESSING">Asynchronous Request Processing</a></li>
</ul></li>
<li><a href="#FUNCTIONS">Functions</a><ul class="code">
<li><a href="#cupsDoAuthentication" title="Authenticate a request.">cupsDoAuthentication</a></li>
<li><a href="#cupsDoFileRequest" title="Do an IPP request with a file.">cupsDoFileRequest</a></li>
<li><a href="#cupsDoIORequest" title="Do an IPP request with file descriptors.">cupsDoIORequest</a></li>
<li><a href="#cupsDoRequest" title="Do an IPP request.">cupsDoRequest</a></li>
<li><a href="#cupsEncodeOptions" title="Encode printer options into IPP attributes.">cupsEncodeOptions</a></li>
<li><a href="#cupsEncodeOptions2" title="Encode printer options into IPP attributes for a group.">cupsEncodeOptions2</a></li>
<li><a href="#cupsGetDevices" title="Get available printer devices.">cupsGetDevices</a></li>
<li><a href="#cupsGetFd" title="Get a file from the server.">cupsGetFd</a></li>
<li><a href="#cupsGetFile" title="Get a file from the server.">cupsGetFile</a></li>
<li><a href="#cupsGetResponse" title="Get a response to an IPP request.">cupsGetResponse</a></li>
<li><a href="#cupsPutFd" title="Put a file on the server.">cupsPutFd</a></li>
<li><a href="#cupsPutFile" title="Put a file on the server.">cupsPutFile</a></li>
<li><a href="#cupsReadResponseData" title="Read additional data after the IPP response.">cupsReadResponseData</a></li>
<li><a href="#cupsSendRequest" title="Send an IPP request.">cupsSendRequest</a></li>
<li><a href="#cupsWriteRequestData" title="Write additional data after an IPP request.">cupsWriteRequestData</a></li>
<li><a href="#httpAddrAny" title="Check for the "any" address.">httpAddrAny</a></li>
<li><a href="#httpAddrEqual" title="Compare two addresses.">httpAddrEqual</a></li>
<li><a href="#httpAddrLength" title="Return the length of the address in bytes.">httpAddrLength</a></li>
<li><a href="#httpAddrLocalhost" title="Check for the local loopback address.">httpAddrLocalhost</a></li>
<li><a href="#httpAddrLookup" title="Lookup the hostname associated with the address.">httpAddrLookup</a></li>
<li><a href="#httpAddrString" title="Convert an address to a numeric string.">httpAddrString</a></li>
<li><a href="#httpAssembleURI" title="Assemble a uniform resource identifier from its
components.">httpAssembleURI</a></li>
<li><a href="#httpAssembleURIf" title="Assemble a uniform resource identifier from its
components with a formatted resource.">httpAssembleURIf</a></li>
<li><a href="#httpBlocking" title="Set blocking/non-blocking behavior on a connection.">httpBlocking</a></li>
<li><a href="#httpCheck" title="Check to see if there is a pending response from the server.">httpCheck</a></li>
<li><a href="#httpClearCookie" title="Clear the cookie value(s).">httpClearCookie</a></li>
<li><a href="#httpClearFields" title="Clear HTTP request fields.">httpClearFields</a></li>
<li><a href="#httpClose" title="Close an HTTP connection.">httpClose</a></li>
<li><a href="#httpConnect" title="Connect to a HTTP server.">httpConnect</a></li>
<li><a href="#httpConnectEncrypt" title="Connect to a HTTP server using encryption.">httpConnectEncrypt</a></li>
<li><a href="#httpDecode64" title="Base64-decode a string.">httpDecode64</a></li>
<li><a href="#httpDecode64_2" title="Base64-decode a string.">httpDecode64_2</a></li>
<li><a href="#httpDelete" title="Send a DELETE request to the server.">httpDelete</a></li>
<li><a href="#httpEncode64" title="Base64-encode a string.">httpEncode64</a></li>
<li><a href="#httpEncode64_2" title="Base64-encode a string.">httpEncode64_2</a></li>
<li><a href="#httpEncryption" title="Set the required encryption on the link.">httpEncryption</a></li>
<li><a href="#httpError" title="Get the last error on a connection.">httpError</a></li>
<li><a href="#httpFlush" title="Flush data from a HTTP connection.">httpFlush</a></li>
<li><a href="#httpFlushWrite" title="Flush data in write buffer.">httpFlushWrite</a></li>
<li><a href="#httpGet" title="Send a GET request to the server.">httpGet</a></li>
<li><a href="#httpGetAuthString" title="Get the current authorization string.">httpGetAuthString</a></li>
<li><a href="#httpGetBlocking" title="Get the blocking/non-block state of a connection.">httpGetBlocking</a></li>
<li><a href="#httpGetCookie" title="Get any cookie data from the response.">httpGetCookie</a></li>
<li><a href="#httpGetDateString" title="Get a formatted date/time string from a time value.">httpGetDateString</a></li>
<li><a href="#httpGetDateString2" title="Get a formatted date/time string from a time value.">httpGetDateString2</a></li>
<li><a href="#httpGetDateTime" title="Get a time value from a formatted date/time string.">httpGetDateTime</a></li>
<li><a href="#httpGetFd" title="Get the file descriptor associated with a connection.">httpGetFd</a></li>
<li><a href="#httpGetField" title="Get a field value from a request/response.">httpGetField</a></li>
<li><a href="#httpGetHostByName" title="Lookup a hostname or IPv4 address, and return
address records for the specified name.">httpGetHostByName</a></li>
<li><a href="#httpGetHostname" title="Get the FQDN for the connection or local system.">httpGetHostname</a></li>
<li><a href="#httpGetLength" title="Get the amount of data remaining from the
content-length or transfer-encoding fields.">httpGetLength</a></li>
<li><a href="#httpGetLength2" title="Get the amount of data remaining from the
content-length or transfer-encoding fields.">httpGetLength2</a></li>
<li><a href="#httpGetStatus" title="Get the status of the last HTTP request.">httpGetStatus</a></li>
<li><a href="#httpGetSubField" title="Get a sub-field value.">httpGetSubField</a></li>
<li><a href="#httpGetSubField2" title="Get a sub-field value.">httpGetSubField2</a></li>
<li><a href="#httpGets" title="Get a line of text from a HTTP connection.">httpGets</a></li>
<li><a href="#httpHead" title="Send a HEAD request to the server.">httpHead</a></li>
<li><a href="#httpInitialize" title="Initialize the HTTP interface library and set the
default HTTP proxy (if any).">httpInitialize</a></li>
<li><a href="#httpMD5" title="Compute the MD5 sum of the username:group:password.">httpMD5</a></li>
<li><a href="#httpMD5Final" title="Combine the MD5 sum of the username, group, and password
with the server-supplied nonce value, method, and
request-uri.">httpMD5Final</a></li>
<li><a href="#httpMD5String" title="Convert an MD5 sum to a character string.">httpMD5String</a></li>
<li><a href="#httpOptions" title="Send an OPTIONS request to the server.">httpOptions</a></li>
<li><a href="#httpPost" title="Send a POST request to the server.">httpPost</a></li>
<li><a href="#httpPut" title="Send a PUT request to the server.">httpPut</a></li>
<li><a href="#httpRead" title="Read data from a HTTP connection.">httpRead</a></li>
<li><a href="#httpRead2" title="Read data from a HTTP connection.">httpRead2</a></li>
<li><a href="#httpReconnect" title="Reconnect to a HTTP server.">httpReconnect</a></li>
<li><a href="#httpSeparate" title="Separate a Universal Resource Identifier into its
components.">httpSeparate</a></li>
<li><a href="#httpSeparate2" title="Separate a Universal Resource Identifier into its
components.">httpSeparate2</a></li>
<li><a href="#httpSeparateURI" title="Separate a Universal Resource Identifier into its
components.">httpSeparateURI</a></li>
<li><a href="#httpSetAuthString" title="Set the current authorization string.">httpSetAuthString</a></li>
<li><a href="#httpSetCookie" title="Set the cookie value(s).">httpSetCookie</a></li>
<li><a href="#httpSetExpect" title="Set the Expect: header in a request.">httpSetExpect</a></li>
<li><a href="#httpSetField" title="Set the value of an HTTP header.">httpSetField</a></li>
<li><a href="#httpSetLength" title="Set the content-length and content-encoding.">httpSetLength</a></li>
<li><a href="#httpStatus" title="Return a short string describing a HTTP status code.">httpStatus</a></li>
<li><a href="#httpTrace" title="Send an TRACE request to the server.">httpTrace</a></li>
<li><a href="#httpUpdate" title="Update the current HTTP state for incoming data.">httpUpdate</a></li>
<li><a href="#httpWait" title="Wait for data available on a connection.">httpWait</a></li>
<li><a href="#httpWrite" title="Write data to a HTTP connection.">httpWrite</a></li>
<li><a href="#httpWrite2" title="Write data to a HTTP connection.">httpWrite2</a></li>
<li><a href="#ippAddBoolean" title="Add a boolean attribute to an IPP message.">ippAddBoolean</a></li>
<li><a href="#ippAddBooleans" title="Add an array of boolean values.">ippAddBooleans</a></li>
<li><a href="#ippAddCollection" title="Add a collection value.">ippAddCollection</a></li>
<li><a href="#ippAddCollections" title="Add an array of collection values.">ippAddCollections</a></li>
<li><a href="#ippAddDate" title="Add a date attribute to an IPP message.">ippAddDate</a></li>
<li><a href="#ippAddInteger" title="Add a integer attribute to an IPP message.">ippAddInteger</a></li>
<li><a href="#ippAddIntegers" title="Add an array of integer values.">ippAddIntegers</a></li>
<li><a href="#ippAddOctetString" title="Add an octetString value to an IPP message.">ippAddOctetString</a></li>
<li><a href="#ippAddRange" title="Add a range of values to an IPP message.">ippAddRange</a></li>
<li><a href="#ippAddRanges" title="Add ranges of values to an IPP message.">ippAddRanges</a></li>
<li><a href="#ippAddResolution" title="Add a resolution value to an IPP message.">ippAddResolution</a></li>
<li><a href="#ippAddResolutions" title="Add resolution values to an IPP message.">ippAddResolutions</a></li>
<li><a href="#ippAddSeparator" title="Add a group separator to an IPP message.">ippAddSeparator</a></li>
<li><a href="#ippAddString" title="Add a language-encoded string to an IPP message.">ippAddString</a></li>
<li><a href="#ippAddStrings" title="Add language-encoded strings to an IPP message.">ippAddStrings</a></li>
<li><a href="#ippDateToTime" title="Convert from RFC 1903 Date/Time format to UNIX time
in seconds.">ippDateToTime</a></li>
<li><a href="#ippDelete" title="Delete an IPP message.">ippDelete</a></li>
<li><a href="#ippDeleteAttribute" title="Delete a single attribute in an IPP message.">ippDeleteAttribute</a></li>
<li><a href="#ippErrorString" title="Return a name for the given status code.">ippErrorString</a></li>
<li><a href="#ippErrorValue" title="Return a status code for the given name.">ippErrorValue</a></li>
<li><a href="#ippFindAttribute" title="Find a named attribute in a request...">ippFindAttribute</a></li>
<li><a href="#ippFindNextAttribute" title="Find the next named attribute in a request...">ippFindNextAttribute</a></li>
<li><a href="#ippLength" title="Compute the length of an IPP message.">ippLength</a></li>
<li><a href="#ippNew" title="Allocate a new IPP message.">ippNew</a></li>
<li><a href="#ippNewRequest" title="Allocate a new IPP request message.">ippNewRequest</a></li>
<li><a href="#ippOpString" title="Return a name for the given operation id.">ippOpString</a></li>
<li><a href="#ippOpValue" title="Return an operation id for the given name.">ippOpValue</a></li>
<li><a href="#ippPort" title="Return the default IPP port number.">ippPort</a></li>
<li><a href="#ippRead" title="Read data for an IPP message from a HTTP connection.">ippRead</a></li>
<li><a href="#ippReadFile" title="Read data for an IPP message from a file.">ippReadFile</a></li>
<li><a href="#ippReadIO" title="Read data for an IPP message.">ippReadIO</a></li>
<li><a href="#ippSetPort" title="Set the default port number.">ippSetPort</a></li>
<li><a href="#ippTagString" title="Return the tag name corresponding to a tag value.">ippTagString</a></li>
<li><a href="#ippTagValue" title="Return the tag value corresponding to a tag name.">ippTagValue</a></li>
<li><a href="#ippTimeToDate" title="Convert from UNIX time to RFC 1903 format.">ippTimeToDate</a></li>
<li><a href="#ippWrite" title="Write data for an IPP message to a HTTP connection.">ippWrite</a></li>
<li><a href="#ippWriteFile" title="Write data for an IPP message to a file.">ippWriteFile</a></li>
<li><a href="#ippWriteIO" title="Write data for an IPP message.">ippWriteIO</a></li>
</ul></li>
<li><a href="#TYPES">Data Types</a><ul class="code">
<li><a href="#http_addr_t" title="Socket address union, which
makes using IPv6 and other
address types easier and
more portable. ">http_addr_t</a></li>
<li><a href="#http_addrlist_t" title="Socket address list, which is
used to enumerate all of the
addresses that are associated
with a hostname. ">http_addrlist_t</a></li>
<li><a href="#http_auth_t" title="HTTP authentication types">http_auth_t</a></li>
<li><a href="#http_encoding_t" title="HTTP transfer encoding values">http_encoding_t</a></li>
<li><a href="#http_encryption_t" title="HTTP encryption values">http_encryption_t</a></li>
<li><a href="#http_field_t" title="HTTP field names">http_field_t</a></li>
<li><a href="#http_keepalive_t" title="HTTP keep-alive values">http_keepalive_t</a></li>
<li><a href="#http_state_t" title="HTTP state values; states
are server-oriented...">http_state_t</a></li>
<li><a href="#http_status_t" title="HTTP status codes">http_status_t</a></li>
<li><a href="#http_t" title="HTTP connection type">http_t</a></li>
<li><a href="#http_uri_coding_t" title="URI en/decode flags">http_uri_coding_t</a></li>
<li><a href="#http_uri_status_t" title="URI separation status ">http_uri_status_t</a></li>
<li><a href="#http_version_t" title="HTTP version numbers">http_version_t</a></li>
<li><a href="#ipp_attribute_t" title="Attribute">ipp_attribute_t</a></li>
<li><a href="#ipp_finish_t" title="Finishings">ipp_finish_t</a></li>
<li><a href="#ipp_iocb_t" title="IPP IO Callback Function ">ipp_iocb_t</a></li>
<li><a href="#ipp_jstate_t" title="Job states">ipp_jstate_t</a></li>
<li><a href="#ipp_op_t" title="IPP operations">ipp_op_t</a></li>
<li><a href="#ipp_orient_t" title="Orientation values">ipp_orient_t</a></li>
<li><a href="#ipp_pstate_t" title="Printer states">ipp_pstate_t</a></li>
<li><a href="#ipp_quality_t" title="Qualities">ipp_quality_t</a></li>
<li><a href="#ipp_request_t" title="Request Header">ipp_request_t</a></li>
<li><a href="#ipp_res_t" title="Resolution units">ipp_res_t</a></li>
<li><a href="#ipp_state_t" title="IPP states">ipp_state_t</a></li>
<li><a href="#ipp_t" title="Attribute Value">ipp_t</a></li>
<li><a href="#ipp_uchar_t" title="IPP status codes">ipp_uchar_t</a></li>
<li><a href="#ipp_tag_t" title="Format tags for attributes">ipp_tag_t</a></li>
<li><a href="#ipp_value_t" title="Attribute Value">ipp_value_t</a></li>
</ul></li>
<li><a href="#STRUCTURES">Structures</a><ul class="code">
<li><a href="#http_addrlist_s" title="Socket address list, which is
used to enumerate all of the
addresses that are associated
with a hostname. ">http_addrlist_s</a></li>
<li><a href="#ipp_attribute_s" title="Attribute">ipp_attribute_s</a></li>
<li><a href="#ipp_s" title="IPP Request/Response/Notification">ipp_s</a></li>
</ul></li>
<li><a href="#UNIONS">Unions</a><ul class="code">
<li><a href="#ipp_request_u" title="Request Header">ipp_request_u</a></li>
<li><a href="#ipp_value_u" title="Attribute Value">ipp_value_u</a></li>
</ul></li>
<li><a href="#ENUMERATIONS">Constants</a><ul class="code">
<li><a href="#http_auth_e" title="HTTP authentication types">http_auth_e</a></li>
<li><a href="#http_encoding_e" title="HTTP transfer encoding values">http_encoding_e</a></li>
<li><a href="#http_encryption_e" title="HTTP encryption values">http_encryption_e</a></li>
<li><a href="#http_field_e" title="HTTP field names">http_field_e</a></li>
<li><a href="#http_keepalive_e" title="HTTP keep-alive values">http_keepalive_e</a></li>
<li><a href="#http_state_e" title="HTTP state values; states
are server-oriented...">http_state_e</a></li>
<li><a href="#http_status_e" title="HTTP status codes">http_status_e</a></li>
<li><a href="#http_uri_coding_e" title="URI en/decode flags">http_uri_coding_e</a></li>
<li><a href="#http_uri_status_e" title="URI separation status ">http_uri_status_e</a></li>
<li><a href="#http_version_e" title="HTTP version numbers">http_version_e</a></li>
<li><a href="#ipp_finish_e" title="Finishings">ipp_finish_e</a></li>
<li><a href="#ipp_jstate_e" title="Job states">ipp_jstate_e</a></li>
<li><a href="#ipp_op_e" title="IPP operations">ipp_op_e</a></li>
<li><a href="#ipp_orient_e" title="Orientation values">ipp_orient_e</a></li>
<li><a href="#ipp_pstate_e" title="Printer states">ipp_pstate_e</a></li>
<li><a href="#ipp_quality_e" title="Qualities">ipp_quality_e</a></li>
<li><a href="#ipp_res_e" title="Resolution units">ipp_res_e</a></li>
<li><a href="#ipp_state_e" title="IPP states">ipp_state_e</a></li>
<li><a href="#ipp_status_e" title="IPP status codes">ipp_status_e</a></li>
<li><a href="#ipp_tag_e" title="Format tags for attributes">ipp_tag_e</a></li>
</ul></li>
<!--
"$Id: api-httpipp.html 9121 2010-04-23 18:57:00Z mike $"
HTTP and IPP API introduction for the Common UNIX Printing System (CUPS).
Copyright 2007-2008 by Apple Inc.
Copyright 1997-2006 by Easy Software Products, all rights reserved.
These coded instructions, statements, and computer programs are the
property of Apple Inc. and are protected by Federal copyright
law. Distribution and use rights are outlined in the file "LICENSE.txt"
which should have been included with this file. If this file is
file is missing or damaged, see the license at "http://www.cups.org/".
-->
<h2 class='title'><a name='OVERVIEW'>Overview</a></h2>
<p>The CUPS HTTP and IPP APIs provide low-level access to the HTTP and IPP
protocols and CUPS scheduler. They are typically used by monitoring and
administration programs to perform specific functions not supported by the
high-level CUPS API functions.</p>
<p>The HTTP APIs use an opaque structure called
<a href='#http_t'><code>http_t</code></a> to manage connections to
a particular HTTP or IPP server. The
<a href='#httpConnectEncrypt'><code>httpConnectEncrypt</code></a> function is
used to create an instance of this structure for a particular server.
The constant <code>CUPS_HTTP_DEFAULT</code> can be used with all of the
<code>cups</code> functions to refer to the default CUPS server - the functions
create a per-thread <a href='#http_t'><code>http_t</code></a> as needed.</p>
<p>The IPP APIs use two structures for requests (messages sent to the CUPS
scheduler) and responses (messages sent back to your application from the
scheduler). The <a href='#ipp_t'><code>ipp_t</code></a> structure holds a
complete request or response and is allocated using the
<a href='#ippNew'><code>ippNew</code></a> or
<a href='#ippNewRequest'><code>ippNewRequest</code></a> functions and
freed using the <a href='#ippDelete'><code>ippDelete</code></a> function.</p>
<p>The second structure is called
<a href='#ipp_attribute_t'><code>ipp_attribute_t</code></a> and holds a
single IPP attribute which consists of a group tag (<code>group_tag</code>), a
value type tag (<code>value_tag</code>), the attribute name (<code>name</code>),
and 1 or more values (<code>values[]</code>). Attributes are added to an
<a href='#ipp_t'><code>ipp_t</code></a> structure using one of the
<code>ippAdd</code> functions. For example, use
<a href='#ippAddString'><code>ippAddString</code></a> to add a
"requesting-user-name" string attribute to a request:</p>
<pre class='example'>
<a href='#ipp_t'>ipp_t</a> *request = <a href='#ippNewRequest'>ippNewRequest</a>(IPP_GET_JOBS);
<a href='#ippAddString'>ippAddString</a>(request, IPP_TAG_OPERATION, IPP_TAG_NAME, "requesting-user-name",
NULL, cupsUser());
</pre>
<p>Once you have created an IPP request, use the <code>cups</code>
functions to send the request to and read the response from the server.
For example, the <a href='#cupsDoRequest'><code>cupsDoRequest</code></a>
function can be used for simple query operations that do not involve files:</p>
<pre class='example'>
#include <cups/cups.h>
<a href='#ipp_t'>ipp_t</a> *<a name='get_jobs'>get_jobs</a>(void)
{
<a href='#ipp_t'>ipp_t</a> *request = <a href='#ippNewRequest'>ippNewRequest</a>(IPP_GET_JOBS);
<a href='#ippAddString'>ippAddString</a>(request, IPP_TAG_OPERATION, IPP_TAG_NAME, "requesting-user-name",
NULL, cupsUser());
return (<a href='#cupsDoRequest'>cupsDoRequest</a>(CUPS_HTTP_DEFAULT, request, "/"));
}
</pre>
<p>The <a href='#cupsDoRequest'><code>cupsDoRequest</code></a> function frees
the request structure and returns an IPP response structure or NULL pointer if
the request could not be sent to the server. Once you have a response from
the server, you can either use the
<a href='#ippFindAttribute'><code>ippFindAttribute</code></a> and
<a href='#ippFindNextAttribute'><code>ippFindNextAttribute</code></a> functions
to find specific attributes, for example:</p>
<pre class='example'>
<a href='#ipp_t'>ipp_t</a> *response;
<a href='#ipp_attribute_t'>ipp_attribute_t</a> *attr;
attr = <a href='#ippFindAttribute'>ippFindAttribute</a>(response, "printer-state", IPP_TAG_ENUM);
</pre>
<p>You can also walk the list of attributes with a simple <code>for</code> loop
like this:</p>
<pre class='example'>
<a href='#ipp_t'>ipp_t</a> *response;
<a href='#ipp_attribute_t'>ipp_attribute_t</a> *attr;
for (attr = response->attrs; attr != NULL; attr = attr->next)
if (attr->name == NULL)
puts("--SEPARATOR--");
else
puts(attr->name);
</pre>
<p>The <code>for</code> loop approach is normally used when collecting
attributes for multiple objects (jobs, printers, etc.) in a response. Attributes
with <code>NULL</code> names indicate a separator between the attributes of
each object. For example, the following code will list the jobs returned from
our previous <a href='#get_jobs'><code>get_jobs</code></a> example code:</p>
<pre class='example'>
<a href='#ipp_t'>ipp_t</a> *response = <a href='#get_jobs'>get_jobs</a>();
if (response != NULL)
{
<a href='#ipp_attribute_t'>ipp_attribute_t</a> *attr;
int job_id = 0;
char *job_name = NULL;
char *job_originating_user_name = NULL;
puts("Job ID Owner Title");
puts("------ ---------------- ---------------------------------");
for (attr = response->attrs; attr != NULL; attr = attr->next)
{
/* Attributes without names are separators between jobs */
if (attr->name == NULL)
{
if (job_id > 0 && job_name != NULL && job_originating_user_name != NULL)
printf("%5d %-16s %s\n", job_id, job_originating_user_name, job_name);
job_id = 0;
job_name = NULL;
job_originating_user_name = NULL;
continue;
}
else if (!strcmp(attr->name, "job-id") && attr->value_tag == IPP_TAG_INTEGER)
job_id = attr->values[0].integer;
else if (!strcmp(attr->name, "job-name") && attr->value_tag == IPP_TAG_NAME)
job_name = attr->values[0].string.text;
else if (!strcmp(attr->name, "job-originating-user-name") &&
attr->value_tag == IPP_TAG_NAME)
job_originating_user_name = attr->values[0].string.text;
}
if (job_id > 0 && job_name != NULL && job_originating_user_name != NULL)
printf("%5d %-16s %s\n", job_id, job_originating_user_name, job_name);
}
</pre>
<h3><a name='CREATING_URI_STRINGS'>Creating URI Strings</a></h3>
<p>To ensure proper encoding, the
<a href='#httpAssembleURIf'><code>httpAssembleURIf</code></a> function must be
used to format a "printer-uri" string for all printer-based requests:</p>
<pre class='example'>
const char *name = "Foo";
char uri[1024];
<a href='#ipp_t'>ipp_t</a> *request;
<a href='#httpAssembleURIf'>httpAssembleURIf</a>(HTTP_URI_CODING_ALL, uri, sizeof(uri), "ipp", NULL, cupsServer(),
ippPort(), "/printers/%s", name);
<a href='#ippAddString'>ippAddString</a>(request, IPP_TAG_OPERATION, IPP_TAG_URI, "printer-uri", NULL, uri);
</pre>
<h3><a name='SENDING_REQUESTS_WITH_FILES'>Sending Requests with Files</a></h3>
<p>The <a href='#cupsDoFileRequest'><code>cupsDoFileRequest</code></a> and
<a href='#cupsDoIORequest'><code>cupsDoIORequest</code></a> functions are
used for requests involving files. The
<a href='#cupsDoFileRequest'><code>cupsDoFileRequest</code></a> function
attaches the named file to a request and is typically used when sending a print
file or changing a printer's PPD file:</p>
<pre class='example'>
const char *filename = "/usr/share/cups/data/testprint.ps";
const char *name = "Foo";
char uri[1024];
char resource[1024];
<a href='#ipp_t'>ipp_t</a> *request = <a href='#ippNewRequest'>ippNewRequest</a>(IPP_PRINT_JOB);
<a href='#ipp_t'>ipp_t</a> *response;
/* Use httpAssembleURIf for the printer-uri string */
<a href='#httpAssembleURIf'>httpAssembleURIf</a>(HTTP_URI_CODING_ALL, uri, sizeof(uri), "ipp", NULL, cupsServer(),
ippPort(), "/printers/%s", name);
<a href='#ippAddString'>ippAddString</a>(request, IPP_TAG_OPERATION, IPP_TAG_URI, "printer-uri", NULL, uri);
<a href='#ippAddString'>ippAddString</a>(request, IPP_TAG_OPERATION, IPP_TAG_NAME, "requesting-user-name",
NULL, cupsUser());
<a href='#ippAddString'>ippAddString</a>(request, IPP_TAG_OPERATION, IPP_TAG_NAME, "job-name",
NULL, "testprint.ps");
/* Use snprintf for the resource path */
snprintf(resource, sizeof(resource), "/printers/%s", name);
response = <a href='#cupsDoFileRequest'>cupsDoFileRequest</a>(CUPS_HTTP_DEFAULT, request, resource, filename);
</pre>
<p>The <a href='#cupsDoIORequest'><code>cupsDoIORequest</code></a> function
optionally attaches a file to the request and optionally saves a file in the
response from the server. It is used when using a pipe for the request
attachment or when using a request that returns a file, currently only
<code>CUPS_GET_DOCUMENT</code> and <code>CUPS_GET_PPD</code>. For example,
the following code will download the PPD file for the sample HP LaserJet
printer driver:</p>
<pre class='example'>
char tempfile[1024];
int tempfd;
<a href='#ipp_t'>ipp_t</a> *request = <a href='#ippNewRequest'>ippNewRequest</a>(CUPS_GET_PPD);
<a href='#ipp_t'>ipp_t</a> *response;
<a href='#ippAddString'>ippAddString</a>(request, IPP_TAG_OPERATION, IPP_TAG_NAME, "ppd-name",
NULL, "laserjet.ppd");
tempfd = cupsTempFd(tempfile, sizeof(tempfile));
response = <a href='#cupsDoIORequest'>cupsDoIORequest</a>(CUPS_HTTP_DEFAULT, request, "/", -1, tempfd);
</pre>
<p>The example passes <code>-1</code> for the input file descriptor to specify
that no file is to be attached to the request. The PPD file attached to the
response is written to the temporary file descriptor we created using the
<code>cupsTempFd</code> function.</p>
<h3><a name='ASYNCHRONOUS_REQUEST_PROCESSING'>Asynchronous Request Processing</a></h3>
<p>The <a href='#cupsSendRequest'><code>cupsSendRequest</code></a> and
<a href='#cupsGetResponse'><code>cupsGetResponse</code></a> support
asynchronous communications with the server. Unlike the other request
functions, the IPP request is not automatically freed, so remember to
free your request with the <a href='#ippDelete'><code>ippDelete</code></a>
function.</p>
<p>File data is attached to the request using the
<a href='#cupsWriteRequestData'><code>cupsWriteRequestData</code></a>
function, while file data returned from the server is read using the
<a href='#cupsReadResponseData'><code>cupsReadResponseData</code></a>
function. We can rewrite the previous <code>CUPS_GET_PPD</code> example
to use the asynchronous functions quite easily:</p>
<pre class='example'>
char tempfile[1024];
int tempfd;
<a href='#ipp_t'>ipp_t</a> *request = <a href='#ippNewRequest'>ippNewRequest</a>(CUPS_GET_PPD);
<a href='#ipp_t'>ipp_t</a> *response;
<a href='#ippAddString'>ippAddString</a>(request, IPP_TAG_OPERATION, IPP_TAG_NAME, "ppd-name",
NULL, "laserjet.ppd");
tempfd = cupsTempFd(tempfile, sizeof(tempfile));
if (<a href='#cupsSendRequest'>cupsSendRequest</a>(CUPS_HTTP_DEFAULT, request, "/") == HTTP_CONTINUE)
{
response = <a href='#cupsGetResponse'>cupsGetResponse</a>(CUPS_HTTP_DEFAULT, "/");
if (response != NULL)
{
ssize_t bytes;
char buffer[8192];
while ((bytes = <a href='#cupsReadResponseData'>cupsReadResponseData</a>(CUPS_HTTP_DEFAULT, buffer, sizeof(buffer))) > 0)
write(tempfd, buffer, bytes);
}
}
/* Free the request! */
<a href='#ippDelete'>ippDelete</a>(request);
</pre>
<p>The <a href='#cupsSendRequest'><code>cupsSendRequest</code></a> function
returns the initial HTTP request status, typically either
<code>HTTP_CONTINUE</code> or <code>HTTP_UNAUTHORIZED</code>. The latter status
is returned when the request requires authentication of some sort. The
<a href='#cupsDoAuthentication'><code>cupsDoAuthentication</code></a> function
must be called when your see <code>HTTP_UNAUTHORIZED</code> and the request
re-sent. We can add authentication support to our example code by using a
<code>do ... while</code> loop:</p>
<pre class='example'>
char tempfile[1024];
int tempfd;
<a href='#ipp_t'>ipp_t</a> *request = <a href='#ippNewRequest'>ippNewRequest</a>(CUPS_GET_PPD);
<a href='#ipp_t'>ipp_t</a> *response;
http_status_t status;
<a href='#ippAddString'>ippAddString</a>(request, IPP_TAG_OPERATION, IPP_TAG_NAME, "ppd-name",
NULL, "laserjet.ppd");
tempfd = cupsTempFd(tempfile, sizeof(tempfile));
/* Loop for authentication */
do
{
status = <a href='#cupsSendRequest'>cupsSendRequest</a>(CUPS_HTTP_DEFAULT, request, "/");
if (status == HTTP_UNAUTHORIZED)
{
/* Try to authenticate, break out of the loop if that fails */
if (<a href='#cupsDoAuthentication'>cupsDoAuthentication</a>(CUPS_HTTP_DEFAULT, "POST", "/"))
break;
}
}
while (status != HTTP_CONTINUE && status != HTTP_UNAUTHORIZED);
if (status == HTTP_CONTINUE)
{
response = <a href='#cupsGetResponse'>cupsGetResponse</a>(CUPS_HTTP_DEFAULT, "/");
if (response != NULL)
{
ssize_t bytes;
char buffer[8192];
while ((bytes = <a href='#cupsReadResponseData'>cupsReadResponseData</a>(CUPS_HTTP_DEFAULT, buffer, sizeof(buffer))) > 0)
write(tempfd, buffer, bytes);
}
}
/* Free the request! */
<a href='#ippDelete'>ippDelete</a>(request);
</pre>
<h2 class="title"><a name="FUNCTIONS">Functions</a></h2>
<h3 class="function"><span class="info"> CUPS 1.1.20/Mac OS X 10.4 </span><a name="cupsDoAuthentication">cupsDoAuthentication</a></h3>
<p class="description">Authenticate a request.</p>
<p class="code">
int cupsDoAuthentication (<br>
<a href="#http_t">http_t</a> *http,<br>
const char *method,<br>
const char *resource<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server or <code>CUPS_HTTP_DEFAULT</code></dd>
<dt>method</dt>
<dd class="description">Request method ("GET", "POST", "PUT")</dd>
<dt>resource</dt>
<dd class="description">Resource path</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">0 on success, -1 on error</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function should be called in response to a <code>HTTP_UNAUTHORIZED</code>
status, prior to resubmitting your request.
</p>
<h3 class="function"><a name="cupsDoFileRequest">cupsDoFileRequest</a></h3>
<p class="description">Do an IPP request with a file.</p>
<p class="code">
<a href="#ipp_t">ipp_t</a> *cupsDoFileRequest (<br>
<a href="#http_t">http_t</a> *http,<br>
<a href="#ipp_t">ipp_t</a> *request,<br>
const char *resource,<br>
const char *filename<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server or <code>CUPS_HTTP_DEFAULT</code></dd>
<dt>request</dt>
<dd class="description">IPP request</dd>
<dt>resource</dt>
<dd class="description">HTTP resource for POST</dd>
<dt>filename</dt>
<dd class="description">File to send or <code>NULL</code> for none</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Response data</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function sends the IPP request to the specified server, retrying
and authenticating as necessary. The request is freed with <a href="#ippDelete"><code>ippDelete</code></a>
after receiving a valid IPP response.</p>
<h3 class="function"><span class="info"> CUPS 1.3/Mac OS X 10.5 </span><a name="cupsDoIORequest">cupsDoIORequest</a></h3>
<p class="description">Do an IPP request with file descriptors.</p>
<p class="code">
<a href="#ipp_t">ipp_t</a> *cupsDoIORequest (<br>
<a href="#http_t">http_t</a> *http,<br>
<a href="#ipp_t">ipp_t</a> *request,<br>
const char *resource,<br>
int infile,<br>
int outfile<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server or <code>CUPS_HTTP_DEFAULT</code></dd>
<dt>request</dt>
<dd class="description">IPP request</dd>
<dt>resource</dt>
<dd class="description">HTTP resource for POST</dd>
<dt>infile</dt>
<dd class="description">File to read from or -1 for none</dd>
<dt>outfile</dt>
<dd class="description">File to write to or -1 for none</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Response data</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function sends the IPP request to the specified server, retrying
and authenticating as necessary. The request is freed with ippDelete()
after receiving a valid IPP response.<br>
<br>
If "infile" is a valid file descriptor, cupsDoIORequest() copies
all of the data from the file after the IPP request message.<br>
<br>
If "outfile" is a valid file descriptor, cupsDoIORequest() copies
all of the data after the IPP response message to the file.
</p>
<h3 class="function"><a name="cupsDoRequest">cupsDoRequest</a></h3>
<p class="description">Do an IPP request.</p>
<p class="code">
<a href="#ipp_t">ipp_t</a> *cupsDoRequest (<br>
<a href="#http_t">http_t</a> *http,<br>
<a href="#ipp_t">ipp_t</a> *request,<br>
const char *resource<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server or <code>CUPS_HTTP_DEFAULT</code></dd>
<dt>request</dt>
<dd class="description">IPP request</dd>
<dt>resource</dt>
<dd class="description">HTTP resource for POST</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Response data</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function sends the IPP request to the specified server, retrying
and authenticating as necessary. The request is freed with ippDelete()
after receiving a valid IPP response.</p>
<h3 class="function"><a name="cupsEncodeOptions">cupsEncodeOptions</a></h3>
<p class="description">Encode printer options into IPP attributes.</p>
<p class="code">
void cupsEncodeOptions (<br>
<a href="#ipp_t">ipp_t</a> *ipp,<br>
int num_options,<br>
cups_option_t *options<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">Request to add to</dd>
<dt>num_options</dt>
<dd class="description">Number of options</dd>
<dt>options</dt>
<dd class="description">Options</dd>
</dl>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function adds operation, job, and then subscription attributes,
in that order. Use the cupsEncodeOptions2() function to add attributes
for a single group.</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="cupsEncodeOptions2">cupsEncodeOptions2</a></h3>
<p class="description">Encode printer options into IPP attributes for a group.</p>
<p class="code">
void cupsEncodeOptions2 (<br>
<a href="#ipp_t">ipp_t</a> *ipp,<br>
int num_options,<br>
cups_option_t *options,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> group_tag<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">Request to add to</dd>
<dt>num_options</dt>
<dd class="description">Number of options</dd>
<dt>options</dt>
<dd class="description">Options</dd>
<dt>group_tag</dt>
<dd class="description">Group to encode</dd>
</dl>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function only adds attributes for a single group. Call this
function multiple times for each group, or use cupsEncodeOptions()
to add the standard groups.
</p>
<h3 class="function"><span class="info"> CUPS 1.4/Mac OS X 10.6 </span><a name="cupsGetDevices">cupsGetDevices</a></h3>
<p class="description">Get available printer devices.</p>
<p class="code">
ipp_status_t cupsGetDevices (<br>
<a href="#http_t">http_t</a> *http,<br>
int timeout,<br>
const char *include_schemes,<br>
const char *exclude_schemes,<br>
cups_device_cb_t callback,<br>
void *user_data<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server or <code>CUPS_HTTP_DEFAULT</code></dd>
<dt>timeout</dt>
<dd class="description">Timeout in seconds or <code>CUPS_TIMEOUT_DEFAULT</code></dd>
<dt>include_schemes</dt>
<dd class="description">Comma-separated URI schemes to include or <code>CUPS_INCLUDE_ALL</code></dd>
<dt>exclude_schemes</dt>
<dd class="description">Comma-separated URI schemes to exclude or <code>CUPS_EXCLUDE_NONE</code></dd>
<dt>callback</dt>
<dd class="description">Callback function</dd>
<dt>user_data</dt>
<dd class="description">User data pointer</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Request status - <code>IPP_OK</code> on success.</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function sends a CUPS-Get-Devices request and streams the discovered
devices to the specified callback function. The "timeout" parameter controls
how long the request lasts, while the "include_schemes" and "exclude_schemes"
parameters provide comma-delimited lists of backends to include or omit from
the request respectively.
</p>
<h3 class="function"><span class="info"> CUPS 1.1.20/Mac OS X 10.4 </span><a name="cupsGetFd">cupsGetFd</a></h3>
<p class="description">Get a file from the server.</p>
<p class="code">
<a href="#http_status_t">http_status_t</a> cupsGetFd (<br>
<a href="#http_t">http_t</a> *http,<br>
const char *resource,<br>
int fd<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server or <code>CUPS_HTTP_DEFAULT</code></dd>
<dt>resource</dt>
<dd class="description">Resource name</dd>
<dt>fd</dt>
<dd class="description">File descriptor</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">HTTP status</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function returns <code>HTTP_OK</code> when the file is successfully retrieved.
</p>
<h3 class="function"><span class="info"> CUPS 1.1.20/Mac OS X 10.4 </span><a name="cupsGetFile">cupsGetFile</a></h3>
<p class="description">Get a file from the server.</p>
<p class="code">
<a href="#http_status_t">http_status_t</a> cupsGetFile (<br>
<a href="#http_t">http_t</a> *http,<br>
const char *resource,<br>
const char *filename<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server or <code>CUPS_HTTP_DEFAULT</code></dd>
<dt>resource</dt>
<dd class="description">Resource name</dd>
<dt>filename</dt>
<dd class="description">Filename</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">HTTP status</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function returns <code>HTTP_OK</code> when the file is successfully retrieved.
</p>
<h3 class="function"><span class="info"> CUPS 1.4/Mac OS X 10.6 </span><a name="cupsGetResponse">cupsGetResponse</a></h3>
<p class="description">Get a response to an IPP request.</p>
<p class="code">
<a href="#ipp_t">ipp_t</a> *cupsGetResponse (<br>
<a href="#http_t">http_t</a> *http,<br>
const char *resource<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server or <code>CUPS_HTTP_DEFAULT</code></dd>
<dt>resource</dt>
<dd class="description">HTTP resource for POST</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Response or <code>NULL</code> on HTTP error</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">Use this function to get the response for an IPP request sent using
cupsSendDocument() or cupsSendRequest(). For requests that return
additional data, use httpRead() after getting a successful response.
</p>
<h3 class="function"><span class="info"> CUPS 1.1.20/Mac OS X 10.4 </span><a name="cupsPutFd">cupsPutFd</a></h3>
<p class="description">Put a file on the server.</p>
<p class="code">
<a href="#http_status_t">http_status_t</a> cupsPutFd (<br>
<a href="#http_t">http_t</a> *http,<br>
const char *resource,<br>
int fd<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server or <code>CUPS_HTTP_DEFAULT</code></dd>
<dt>resource</dt>
<dd class="description">Resource name</dd>
<dt>fd</dt>
<dd class="description">File descriptor</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">HTTP status</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function returns <code>HTTP_CREATED</code> when the file is stored
successfully.
</p>
<h3 class="function"><span class="info"> CUPS 1.1.20/Mac OS X 10.4 </span><a name="cupsPutFile">cupsPutFile</a></h3>
<p class="description">Put a file on the server.</p>
<p class="code">
<a href="#http_status_t">http_status_t</a> cupsPutFile (<br>
<a href="#http_t">http_t</a> *http,<br>
const char *resource,<br>
const char *filename<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server or <code>CUPS_HTTP_DEFAULT</code></dd>
<dt>resource</dt>
<dd class="description">Resource name</dd>
<dt>filename</dt>
<dd class="description">Filename</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">HTTP status</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function returns <code>HTTP_CREATED</code> when the file is stored
successfully.
</p>
<h3 class="function"><span class="info"> CUPS 1.4/Mac OS X 10.6 </span><a name="cupsReadResponseData">cupsReadResponseData</a></h3>
<p class="description">Read additional data after the IPP response.</p>
<p class="code">
ssize_t cupsReadResponseData (<br>
<a href="#http_t">http_t</a> *http,<br>
char *buffer,<br>
size_t length<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server or <code>CUPS_HTTP_DEFAULT</code></dd>
<dt>buffer</dt>
<dd class="description">Buffer to use</dd>
<dt>length</dt>
<dd class="description">Number of bytes to read</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Bytes read, 0 on EOF, -1 on error</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function is used after cupsGetResponse() to read the PPD or document
files for CUPS_GET_PPD and CUPS_GET_DOCUMENT requests, respectively.
</p>
<h3 class="function"><span class="info"> CUPS 1.4/Mac OS X 10.6 </span><a name="cupsSendRequest">cupsSendRequest</a></h3>
<p class="description">Send an IPP request.</p>
<p class="code">
<a href="#http_status_t">http_status_t</a> cupsSendRequest (<br>
<a href="#http_t">http_t</a> *http,<br>
<a href="#ipp_t">ipp_t</a> *request,<br>
const char *resource,<br>
size_t length<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server or <code>CUPS_HTTP_DEFAULT</code></dd>
<dt>request</dt>
<dd class="description">IPP request</dd>
<dt>resource</dt>
<dd class="description">Resource path</dd>
<dt>length</dt>
<dd class="description">Length of data to follow or <code>CUPS_LENGTH_VARIABLE</code></dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Initial HTTP status</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">Use httpWrite() to write any additional data (document, PPD file, etc.)
for the request, cupsGetResponse() to get the IPP response, and httpRead()
to read any additional data following the response. Only one request can be
sent/queued at a time.<br>
<br>
Unlike cupsDoFileRequest(), cupsDoIORequest(), and cupsDoRequest(), the
request is not freed.
</p>
<h3 class="function"><span class="info"> CUPS 1.4/Mac OS X 10.6 </span><a name="cupsWriteRequestData">cupsWriteRequestData</a></h3>
<p class="description">Write additional data after an IPP request.</p>
<p class="code">
<a href="#http_status_t">http_status_t</a> cupsWriteRequestData (<br>
<a href="#http_t">http_t</a> *http,<br>
const char *buffer,<br>
size_t length<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server or <code>CUPS_HTTP_DEFAULT</code></dd>
<dt>buffer</dt>
<dd class="description">Bytes to write</dd>
<dt>length</dt>
<dd class="description">Number of bytes to write</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description"><code>HTTP_CONTINUE</code> if OK or HTTP status on error</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function is used after <a href="#cupsSendRequest"><code>cupsSendRequest</code></a> to provide a PPD and
after <a href="#cupsStartDocument"><code>cupsStartDocument</code></a> to provide a document file.
</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpAddrAny">httpAddrAny</a></h3>
<p class="description">Check for the "any" address.</p>
<p class="code">
int httpAddrAny (<br>
const <a href="#http_addr_t">http_addr_t</a> *addr<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>addr</dt>
<dd class="description">Address to check</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">1 if "any", 0 otherwise</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpAddrEqual">httpAddrEqual</a></h3>
<p class="description">Compare two addresses.</p>
<p class="code">
int httpAddrEqual (<br>
const <a href="#http_addr_t">http_addr_t</a> *addr1,<br>
const <a href="#http_addr_t">http_addr_t</a> *addr2<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>addr1</dt>
<dd class="description">First address</dd>
<dt>addr2</dt>
<dd class="description">Second address</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">1 if equal, 0 if not</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpAddrLength">httpAddrLength</a></h3>
<p class="description">Return the length of the address in bytes.</p>
<p class="code">
int httpAddrLength (<br>
const <a href="#http_addr_t">http_addr_t</a> *addr<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>addr</dt>
<dd class="description">Address</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Length in bytes</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpAddrLocalhost">httpAddrLocalhost</a></h3>
<p class="description">Check for the local loopback address.</p>
<p class="code">
int httpAddrLocalhost (<br>
const <a href="#http_addr_t">http_addr_t</a> *addr<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>addr</dt>
<dd class="description">Address to check</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">1 if local host, 0 otherwise</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpAddrLookup">httpAddrLookup</a></h3>
<p class="description">Lookup the hostname associated with the address.</p>
<p class="code">
char *httpAddrLookup (<br>
const <a href="#http_addr_t">http_addr_t</a> *addr,<br>
char *name,<br>
int namelen<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>addr</dt>
<dd class="description">Address to lookup</dd>
<dt>name</dt>
<dd class="description">Host name buffer</dd>
<dt>namelen</dt>
<dd class="description">Size of name buffer</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Host name</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpAddrString">httpAddrString</a></h3>
<p class="description">Convert an address to a numeric string.</p>
<p class="code">
char *httpAddrString (<br>
const <a href="#http_addr_t">http_addr_t</a> *addr,<br>
char *s,<br>
int slen<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>addr</dt>
<dd class="description">Address to convert</dd>
<dt>s</dt>
<dd class="description">String buffer</dd>
<dt>slen</dt>
<dd class="description">Length of string</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Numeric address string</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpAssembleURI">httpAssembleURI</a></h3>
<p class="description">Assemble a uniform resource identifier from its
components.</p>
<p class="code">
<a href="#http_uri_status_t">http_uri_status_t</a> httpAssembleURI (<br>
<a href="#http_uri_coding_t">http_uri_coding_t</a> encoding,<br>
char *uri,<br>
int urilen,<br>
const char *scheme,<br>
const char *username,<br>
const char *host,<br>
int port,<br>
const char *resource<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>encoding</dt>
<dd class="description">Encoding flags</dd>
<dt>uri</dt>
<dd class="description">URI buffer</dd>
<dt>urilen</dt>
<dd class="description">Size of URI buffer</dd>
<dt>scheme</dt>
<dd class="description">Scheme name</dd>
<dt>username</dt>
<dd class="description">Username</dd>
<dt>host</dt>
<dd class="description">Hostname or address</dd>
<dt>port</dt>
<dd class="description">Port number</dd>
<dt>resource</dt>
<dd class="description">Resource</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">URI status</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function escapes reserved characters in the URI depending on the
value of the "encoding" argument. You should use this function in
place of traditional string functions whenever you need to create a
URI string.
</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpAssembleURIf">httpAssembleURIf</a></h3>
<p class="description">Assemble a uniform resource identifier from its
components with a formatted resource.</p>
<p class="code">
<a href="#http_uri_status_t">http_uri_status_t</a> httpAssembleURIf (<br>
<a href="#http_uri_coding_t">http_uri_coding_t</a> encoding,<br>
char *uri,<br>
int urilen,<br>
const char *scheme,<br>
const char *username,<br>
const char *host,<br>
int port,<br>
const char *resourcef,<br>
...<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>encoding</dt>
<dd class="description">Encoding flags</dd>
<dt>uri</dt>
<dd class="description">URI buffer</dd>
<dt>urilen</dt>
<dd class="description">Size of URI buffer</dd>
<dt>scheme</dt>
<dd class="description">Scheme name</dd>
<dt>username</dt>
<dd class="description">Username</dd>
<dt>host</dt>
<dd class="description">Hostname or address</dd>
<dt>port</dt>
<dd class="description">Port number</dd>
<dt>resourcef</dt>
<dd class="description">Printf-style resource</dd>
<dt>...</dt>
<dd class="description">Additional arguments as needed</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">URI status</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function creates a formatted version of the resource string
argument "resourcef" and escapes reserved characters in the URI
depending on the value of the "encoding" argument. You should use
this function in place of traditional string functions whenever
you need to create a URI string.
</p>
<h3 class="function"><a name="httpBlocking">httpBlocking</a></h3>
<p class="description">Set blocking/non-blocking behavior on a connection.</p>
<p class="code">
void httpBlocking (<br>
<a href="#http_t">http_t</a> *http,<br>
int b<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>b</dt>
<dd class="description">1 = blocking, 0 = non-blocking</dd>
</dl>
<h3 class="function"><a name="httpCheck">httpCheck</a></h3>
<p class="description">Check to see if there is a pending response from the server.</p>
<p class="code">
int httpCheck (<br>
<a href="#http_t">http_t</a> *http<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">0 = no data, 1 = data available</p>
<h3 class="function"><span class="info"> CUPS 1.1.19/Mac OS X 10.3 </span><a name="httpClearCookie">httpClearCookie</a></h3>
<p class="description">Clear the cookie value(s).</p>
<p class="code">
void httpClearCookie (<br>
<a href="#http_t">http_t</a> *http<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
</dl>
<h3 class="function"><a name="httpClearFields">httpClearFields</a></h3>
<p class="description">Clear HTTP request fields.</p>
<p class="code">
void httpClearFields (<br>
<a href="#http_t">http_t</a> *http<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
</dl>
<h3 class="function"><a name="httpClose">httpClose</a></h3>
<p class="description">Close an HTTP connection.</p>
<p class="code">
void httpClose (<br>
<a href="#http_t">http_t</a> *http<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
</dl>
<h3 class="function"><span class="info"> DEPRECATED </span><a name="httpConnect">httpConnect</a></h3>
<p class="description">Connect to a HTTP server.</p>
<p class="code">
<a href="#http_t">http_t</a> *httpConnect (<br>
const char *host,<br>
int port<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>host</dt>
<dd class="description">Host to connect to</dd>
<dt>port</dt>
<dd class="description">Port number</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New HTTP connection</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function is deprecated - use <a href="#httpConnectEncrypt"><code>httpConnectEncrypt</code></a> instead.
</p>
<h3 class="function"><a name="httpConnectEncrypt">httpConnectEncrypt</a></h3>
<p class="description">Connect to a HTTP server using encryption.</p>
<p class="code">
<a href="#http_t">http_t</a> *httpConnectEncrypt (<br>
const char *host,<br>
int port,<br>
<a href="#http_encryption_t">http_encryption_t</a> encryption<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>host</dt>
<dd class="description">Host to connect to</dd>
<dt>port</dt>
<dd class="description">Port number</dd>
<dt>encryption</dt>
<dd class="description">Type of encryption to use</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New HTTP connection</p>
<h3 class="function"><span class="info"> DEPRECATED </span><a name="httpDecode64">httpDecode64</a></h3>
<p class="description">Base64-decode a string.</p>
<p class="code">
char *httpDecode64 (<br>
char *out,<br>
const char *in<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>out</dt>
<dd class="description">String to write to</dd>
<dt>in</dt>
<dd class="description">String to read from</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Decoded string</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function is deprecated. Use the httpDecode64_2() function instead
which provides buffer length arguments.
</p>
<h3 class="function"><span class="info"> CUPS 1.1.21/Mac OS X 10.4 </span><a name="httpDecode64_2">httpDecode64_2</a></h3>
<p class="description">Base64-decode a string.</p>
<p class="code">
char *httpDecode64_2 (<br>
char *out,<br>
int *outlen,<br>
const char *in<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>out</dt>
<dd class="description">String to write to</dd>
<dt>outlen</dt>
<dd class="description">Size of output string</dd>
<dt>in</dt>
<dd class="description">String to read from</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Decoded string</p>
<h3 class="function"><a name="httpDelete">httpDelete</a></h3>
<p class="description">Send a DELETE request to the server.</p>
<p class="code">
int httpDelete (<br>
<a href="#http_t">http_t</a> *http,<br>
const char *uri<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>uri</dt>
<dd class="description">URI to delete</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Status of call (0 = success)</p>
<h3 class="function"><span class="info"> DEPRECATED </span><a name="httpEncode64">httpEncode64</a></h3>
<p class="description">Base64-encode a string.</p>
<p class="code">
char *httpEncode64 (<br>
char *out,<br>
const char *in<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>out</dt>
<dd class="description">String to write to</dd>
<dt>in</dt>
<dd class="description">String to read from</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Encoded string</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function is deprecated. Use the httpEncode64_2() function instead
which provides buffer length arguments.
</p>
<h3 class="function"><span class="info"> CUPS 1.1.21/Mac OS X 10.4 </span><a name="httpEncode64_2">httpEncode64_2</a></h3>
<p class="description">Base64-encode a string.</p>
<p class="code">
char *httpEncode64_2 (<br>
char *out,<br>
int outlen,<br>
const char *in,<br>
int inlen<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>out</dt>
<dd class="description">String to write to</dd>
<dt>outlen</dt>
<dd class="description">Size of output string</dd>
<dt>in</dt>
<dd class="description">String to read from</dd>
<dt>inlen</dt>
<dd class="description">Size of input string</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Encoded string</p>
<h3 class="function"><a name="httpEncryption">httpEncryption</a></h3>
<p class="description">Set the required encryption on the link.</p>
<p class="code">
int httpEncryption (<br>
<a href="#http_t">http_t</a> *http,<br>
<a href="#http_encryption_t">http_encryption_t</a> e<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>e</dt>
<dd class="description">New encryption preference</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">-1 on error, 0 on success</p>
<h3 class="function"><a name="httpError">httpError</a></h3>
<p class="description">Get the last error on a connection.</p>
<p class="code">
int httpError (<br>
<a href="#http_t">http_t</a> *http<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Error code (errno) value</p>
<h3 class="function"><a name="httpFlush">httpFlush</a></h3>
<p class="description">Flush data from a HTTP connection.</p>
<p class="code">
void httpFlush (<br>
<a href="#http_t">http_t</a> *http<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
</dl>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpFlushWrite">httpFlushWrite</a></h3>
<p class="description">Flush data in write buffer.</p>
<p class="code">
int httpFlushWrite (<br>
<a href="#http_t">http_t</a> *http<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Bytes written or -1 on error</p>
<h3 class="function"><a name="httpGet">httpGet</a></h3>
<p class="description">Send a GET request to the server.</p>
<p class="code">
int httpGet (<br>
<a href="#http_t">http_t</a> *http,<br>
const char *uri<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>uri</dt>
<dd class="description">URI to get</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Status of call (0 = success)</p>
<h3 class="function"><span class="info"> CUPS 1.3/Mac OS X 10.5 </span><a name="httpGetAuthString">httpGetAuthString</a></h3>
<p class="description">Get the current authorization string.</p>
<p class="code">
char *httpGetAuthString (<br>
<a href="#http_t">http_t</a> *http<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Authorization string</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">The authorization string is set by cupsDoAuthentication() and
httpSetAuthString(). Use httpGetAuthString() to retrieve the
string to use with httpSetField() for the HTTP_FIELD_AUTHORIZATION
value.
</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpGetBlocking">httpGetBlocking</a></h3>
<p class="description">Get the blocking/non-block state of a connection.</p>
<p class="code">
int httpGetBlocking (<br>
<a href="#http_t">http_t</a> *http<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">1 if blocking, 0 if non-blocking</p>
<h3 class="function"><span class="info"> CUPS 1.1.19/Mac OS X 10.3 </span><a name="httpGetCookie">httpGetCookie</a></h3>
<p class="description">Get any cookie data from the response.</p>
<p class="code">
const char *httpGetCookie (<br>
<a href="#http_t">http_t</a> *http<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">HTTP connecion</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Cookie data or NULL</p>
<h3 class="function"><span class="info"> DEPRECATED </span><a name="httpGetDateString">httpGetDateString</a></h3>
<p class="description">Get a formatted date/time string from a time value.</p>
<p class="code">
const char *httpGetDateString (<br>
time_t t<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>t</dt>
<dd class="description">UNIX time</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Date/time string</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpGetDateString2">httpGetDateString2</a></h3>
<p class="description">Get a formatted date/time string from a time value.</p>
<p class="code">
const char *httpGetDateString2 (<br>
time_t t,<br>
char *s,<br>
int slen<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>t</dt>
<dd class="description">UNIX time</dd>
<dt>s</dt>
<dd class="description">String buffer</dd>
<dt>slen</dt>
<dd class="description">Size of string buffer</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Date/time string</p>
<h3 class="function"><a name="httpGetDateTime">httpGetDateTime</a></h3>
<p class="description">Get a time value from a formatted date/time string.</p>
<p class="code">
time_t httpGetDateTime (<br>
const char *s<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>s</dt>
<dd class="description">Date/time string</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">UNIX time</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpGetFd">httpGetFd</a></h3>
<p class="description">Get the file descriptor associated with a connection.</p>
<p class="code">
int httpGetFd (<br>
<a href="#http_t">http_t</a> *http<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">File descriptor or -1 if none</p>
<h3 class="function"><a name="httpGetField">httpGetField</a></h3>
<p class="description">Get a field value from a request/response.</p>
<p class="code">
const char *httpGetField (<br>
<a href="#http_t">http_t</a> *http,<br>
<a href="#http_field_t">http_field_t</a> field<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>field</dt>
<dd class="description">Field to get</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Field value</p>
<h3 class="function"><span class="info"> DEPRECATED </span><a name="httpGetHostByName">httpGetHostByName</a></h3>
<p class="description">Lookup a hostname or IPv4 address, and return
address records for the specified name.</p>
<p class="code">
struct hostent *httpGetHostByName (<br>
const char *name<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>name</dt>
<dd class="description">Hostname or IP address</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Host entry</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpGetHostname">httpGetHostname</a></h3>
<p class="description">Get the FQDN for the connection or local system.</p>
<p class="code">
const char *httpGetHostname (<br>
<a href="#http_t">http_t</a> *http,<br>
char *s,<br>
int slen<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">HTTP connection or NULL</dd>
<dt>s</dt>
<dd class="description">String buffer for name</dd>
<dt>slen</dt>
<dd class="description">Size of buffer</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">FQDN for connection or system</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">When "http" points to a connected socket, return the hostname or
address that was used in the call to httpConnect() or httpConnectEncrypt().
Otherwise, return the FQDN for the local system using both gethostname()
and gethostbyname() to get the local hostname with domain.
</p>
<h3 class="function"><span class="info"> DEPRECATED </span><a name="httpGetLength">httpGetLength</a></h3>
<p class="description">Get the amount of data remaining from the
content-length or transfer-encoding fields.</p>
<p class="code">
int httpGetLength (<br>
<a href="#http_t">http_t</a> *http<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Content length</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function is deprecated and will not return lengths larger than
2^31 - 1; use httpGetLength2() instead.
</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpGetLength2">httpGetLength2</a></h3>
<p class="description">Get the amount of data remaining from the
content-length or transfer-encoding fields.</p>
<p class="code">
off_t httpGetLength2 (<br>
<a href="#http_t">http_t</a> *http<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Content length</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function returns the complete content length, even for
content larger than 2^31 - 1.
</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpGetStatus">httpGetStatus</a></h3>
<p class="description">Get the status of the last HTTP request.</p>
<p class="code">
<a href="#http_status_t">http_status_t</a> httpGetStatus (<br>
<a href="#http_t">http_t</a> *http<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">HTTP status</p>
<h3 class="function"><span class="info"> DEPRECATED </span><a name="httpGetSubField">httpGetSubField</a></h3>
<p class="description">Get a sub-field value.</p>
<p class="code">
char *httpGetSubField (<br>
<a href="#http_t">http_t</a> *http,<br>
<a href="#http_field_t">http_field_t</a> field,<br>
const char *name,<br>
char *value<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>field</dt>
<dd class="description">Field index</dd>
<dt>name</dt>
<dd class="description">Name of sub-field</dd>
<dt>value</dt>
<dd class="description">Value string</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Value or NULL</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpGetSubField2">httpGetSubField2</a></h3>
<p class="description">Get a sub-field value.</p>
<p class="code">
char *httpGetSubField2 (<br>
<a href="#http_t">http_t</a> *http,<br>
<a href="#http_field_t">http_field_t</a> field,<br>
const char *name,<br>
char *value,<br>
int valuelen<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>field</dt>
<dd class="description">Field index</dd>
<dt>name</dt>
<dd class="description">Name of sub-field</dd>
<dt>value</dt>
<dd class="description">Value string</dd>
<dt>valuelen</dt>
<dd class="description">Size of value buffer</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Value or NULL</p>
<h3 class="function"><a name="httpGets">httpGets</a></h3>
<p class="description">Get a line of text from a HTTP connection.</p>
<p class="code">
char *httpGets (<br>
char *line,<br>
int length,<br>
<a href="#http_t">http_t</a> *http<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>line</dt>
<dd class="description">Line to read into</dd>
<dt>length</dt>
<dd class="description">Max length of buffer</dd>
<dt>http</dt>
<dd class="description">Connection to server</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Line or NULL</p>
<h3 class="function"><a name="httpHead">httpHead</a></h3>
<p class="description">Send a HEAD request to the server.</p>
<p class="code">
int httpHead (<br>
<a href="#http_t">http_t</a> *http,<br>
const char *uri<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>uri</dt>
<dd class="description">URI for head</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Status of call (0 = success)</p>
<h3 class="function"><a name="httpInitialize">httpInitialize</a></h3>
<p class="description">Initialize the HTTP interface library and set the
default HTTP proxy (if any).</p>
<p class="code">
void httpInitialize (void);</p>
<h3 class="function"><a name="httpMD5">httpMD5</a></h3>
<p class="description">Compute the MD5 sum of the username:group:password.</p>
<p class="code">
char *httpMD5 (<br>
const char *username,<br>
const char *realm,<br>
const char *passwd,<br>
char md5[33]<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>username</dt>
<dd class="description">User name</dd>
<dt>realm</dt>
<dd class="description">Realm name</dd>
<dt>passwd</dt>
<dd class="description">Password string</dd>
<dt>md5[33]</dt>
<dd class="description">MD5 string</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">MD5 sum</p>
<h3 class="function"><a name="httpMD5Final">httpMD5Final</a></h3>
<p class="description">Combine the MD5 sum of the username, group, and password
with the server-supplied nonce value, method, and
request-uri.</p>
<p class="code">
char *httpMD5Final (<br>
const char *nonce,<br>
const char *method,<br>
const char *resource,<br>
char md5[33]<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>nonce</dt>
<dd class="description">Server nonce value</dd>
<dt>method</dt>
<dd class="description">METHOD (GET, POST, etc.)</dd>
<dt>resource</dt>
<dd class="description">Resource path</dd>
<dt>md5[33]</dt>
<dd class="description">MD5 sum</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New sum</p>
<h3 class="function"><a name="httpMD5String">httpMD5String</a></h3>
<p class="description">Convert an MD5 sum to a character string.</p>
<p class="code">
char *httpMD5String (<br>
const unsigned char *sum,<br>
char md5[33]<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>sum</dt>
<dd class="description">MD5 sum data</dd>
<dt>md5[33]</dt>
<dd class="description">MD5 sum in hex</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">MD5 sum in hex</p>
<h3 class="function"><a name="httpOptions">httpOptions</a></h3>
<p class="description">Send an OPTIONS request to the server.</p>
<p class="code">
int httpOptions (<br>
<a href="#http_t">http_t</a> *http,<br>
const char *uri<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>uri</dt>
<dd class="description">URI for options</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Status of call (0 = success)</p>
<h3 class="function"><a name="httpPost">httpPost</a></h3>
<p class="description">Send a POST request to the server.</p>
<p class="code">
int httpPost (<br>
<a href="#http_t">http_t</a> *http,<br>
const char *uri<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>uri</dt>
<dd class="description">URI for post</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Status of call (0 = success)</p>
<h3 class="function"><a name="httpPut">httpPut</a></h3>
<p class="description">Send a PUT request to the server.</p>
<p class="code">
int httpPut (<br>
<a href="#http_t">http_t</a> *http,<br>
const char *uri<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>uri</dt>
<dd class="description">URI to put</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Status of call (0 = success)</p>
<h3 class="function"><span class="info"> DEPRECATED </span><a name="httpRead">httpRead</a></h3>
<p class="description">Read data from a HTTP connection.</p>
<p class="code">
int httpRead (<br>
<a href="#http_t">http_t</a> *http,<br>
char *buffer,<br>
int length<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>buffer</dt>
<dd class="description">Buffer for data</dd>
<dt>length</dt>
<dd class="description">Maximum number of bytes</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Number of bytes read</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function is deprecated. Use the httpRead2() function which can
read more than 2GB of data.
</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpRead2">httpRead2</a></h3>
<p class="description">Read data from a HTTP connection.</p>
<p class="code">
ssize_t httpRead2 (<br>
<a href="#http_t">http_t</a> *http,<br>
char *buffer,<br>
size_t length<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>buffer</dt>
<dd class="description">Buffer for data</dd>
<dt>length</dt>
<dd class="description">Maximum number of bytes</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Number of bytes read</p>
<h3 class="function"><a name="httpReconnect">httpReconnect</a></h3>
<p class="description">Reconnect to a HTTP server.</p>
<p class="code">
int httpReconnect (<br>
<a href="#http_t">http_t</a> *http<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">0 on success, non-zero on failure</p>
<h3 class="function"><span class="info"> DEPRECATED </span><a name="httpSeparate">httpSeparate</a></h3>
<p class="description">Separate a Universal Resource Identifier into its
components.</p>
<p class="code">
void httpSeparate (<br>
const char *uri,<br>
char *scheme,<br>
char *username,<br>
char *host,<br>
int *port,<br>
char *resource<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>uri</dt>
<dd class="description">Universal Resource Identifier</dd>
<dt>scheme</dt>
<dd class="description">Scheme [32] (http, https, etc.)</dd>
<dt>username</dt>
<dd class="description">Username [1024]</dd>
<dt>host</dt>
<dd class="description">Hostname [1024]</dd>
<dt>port</dt>
<dd class="description">Port number to use</dd>
<dt>resource</dt>
<dd class="description">Resource/filename [1024]</dd>
</dl>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function is deprecated; use the httpSeparateURI() function instead.
</p>
<h3 class="function"><span class="info"> CUPS 1.1.21/Mac OS X 10.4 </span><a name="httpSeparate2">httpSeparate2</a></h3>
<p class="description">Separate a Universal Resource Identifier into its
components.</p>
<p class="code">
void httpSeparate2 (<br>
const char *uri,<br>
char *scheme,<br>
int schemelen,<br>
char *username,<br>
int usernamelen,<br>
char *host,<br>
int hostlen,<br>
int *port,<br>
char *resource,<br>
int resourcelen<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>uri</dt>
<dd class="description">Universal Resource Identifier</dd>
<dt>scheme</dt>
<dd class="description">Scheme (http, https, etc.)</dd>
<dt>schemelen</dt>
<dd class="description">Size of scheme buffer</dd>
<dt>username</dt>
<dd class="description">Username</dd>
<dt>usernamelen</dt>
<dd class="description">Size of username buffer</dd>
<dt>host</dt>
<dd class="description">Hostname</dd>
<dt>hostlen</dt>
<dd class="description">Size of hostname buffer</dd>
<dt>port</dt>
<dd class="description">Port number to use</dd>
<dt>resource</dt>
<dd class="description">Resource/filename</dd>
<dt>resourcelen</dt>
<dd class="description">Size of resource buffer</dd>
</dl>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function is deprecated; use the httpSeparateURI() function instead.
</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpSeparateURI">httpSeparateURI</a></h3>
<p class="description">Separate a Universal Resource Identifier into its
components.</p>
<p class="code">
<a href="#http_uri_status_t">http_uri_status_t</a> httpSeparateURI (<br>
<a href="#http_uri_coding_t">http_uri_coding_t</a> decoding,<br>
const char *uri,<br>
char *scheme,<br>
int schemelen,<br>
char *username,<br>
int usernamelen,<br>
char *host,<br>
int hostlen,<br>
int *port,<br>
char *resource,<br>
int resourcelen<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>decoding</dt>
<dd class="description">Decoding flags</dd>
<dt>uri</dt>
<dd class="description">Universal Resource Identifier</dd>
<dt>scheme</dt>
<dd class="description">Scheme (http, https, etc.)</dd>
<dt>schemelen</dt>
<dd class="description">Size of scheme buffer</dd>
<dt>username</dt>
<dd class="description">Username</dd>
<dt>usernamelen</dt>
<dd class="description">Size of username buffer</dd>
<dt>host</dt>
<dd class="description">Hostname</dd>
<dt>hostlen</dt>
<dd class="description">Size of hostname buffer</dd>
<dt>port</dt>
<dd class="description">Port number to use</dd>
<dt>resource</dt>
<dd class="description">Resource/filename</dd>
<dt>resourcelen</dt>
<dd class="description">Size of resource buffer</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Result of separation</p>
<h3 class="function"><span class="info"> CUPS 1.3/Mac OS X 10.5 </span><a name="httpSetAuthString">httpSetAuthString</a></h3>
<p class="description">Set the current authorization string.</p>
<p class="code">
void httpSetAuthString (<br>
<a href="#http_t">http_t</a> *http,<br>
const char *scheme,<br>
const char *data<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>scheme</dt>
<dd class="description">Auth scheme (NULL to clear it)</dd>
<dt>data</dt>
<dd class="description">Auth data (NULL for none)</dd>
</dl>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function just stores a copy of the current authorization string in
the HTTP connection object. You must still call httpSetField() to set
HTTP_FIELD_AUTHORIZATION prior to issuing a HTTP request using httpGet(),
httpHead(), httpOptions(), httpPost, or httpPut().
</p>
<h3 class="function"><span class="info"> CUPS 1.1.19/Mac OS X 10.3 </span><a name="httpSetCookie">httpSetCookie</a></h3>
<p class="description">Set the cookie value(s).</p>
<p class="code">
void httpSetCookie (<br>
<a href="#http_t">http_t</a> *http,<br>
const char *cookie<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection</dd>
<dt>cookie</dt>
<dd class="description">Cookie string</dd>
</dl>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpSetExpect">httpSetExpect</a></h3>
<p class="description">Set the Expect: header in a request.</p>
<p class="code">
void httpSetExpect (<br>
<a href="#http_t">http_t</a> *http,<br>
<a href="#http_status_t">http_status_t</a> expect<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>expect</dt>
<dd class="description">HTTP status to expect (HTTP_CONTINUE)</dd>
</dl>
<h4 class="discussion">Discussion</h4>
<p class="discussion">Currently only HTTP_CONTINUE is supported for the "expect" argument.
</p>
<h3 class="function"><a name="httpSetField">httpSetField</a></h3>
<p class="description">Set the value of an HTTP header.</p>
<p class="code">
void httpSetField (<br>
<a href="#http_t">http_t</a> *http,<br>
<a href="#http_field_t">http_field_t</a> field,<br>
const char *value<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>field</dt>
<dd class="description">Field index</dd>
<dt>value</dt>
<dd class="description">Value</dd>
</dl>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpSetLength">httpSetLength</a></h3>
<p class="description">Set the content-length and content-encoding.</p>
<p class="code">
void httpSetLength (<br>
<a href="#http_t">http_t</a> *http,<br>
size_t length<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>length</dt>
<dd class="description">Length (0 for chunked)</dd>
</dl>
<h3 class="function"><a name="httpStatus">httpStatus</a></h3>
<p class="description">Return a short string describing a HTTP status code.</p>
<p class="code">
const char *httpStatus (<br>
<a href="#http_status_t">http_status_t</a> status<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>status</dt>
<dd class="description">HTTP status code</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Localized status string</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">The returned string is localized to the current POSIX locale and is based
on the status strings defined in RFC 2616.</p>
<h3 class="function"><a name="httpTrace">httpTrace</a></h3>
<p class="description">Send an TRACE request to the server.</p>
<p class="code">
int httpTrace (<br>
<a href="#http_t">http_t</a> *http,<br>
const char *uri<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>uri</dt>
<dd class="description">URI for trace</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Status of call (0 = success)</p>
<h3 class="function"><a name="httpUpdate">httpUpdate</a></h3>
<p class="description">Update the current HTTP state for incoming data.</p>
<p class="code">
<a href="#http_status_t">http_status_t</a> httpUpdate (<br>
<a href="#http_t">http_t</a> *http<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">HTTP status</p>
<h3 class="function"><span class="info"> CUPS 1.1.19/Mac OS X 10.3 </span><a name="httpWait">httpWait</a></h3>
<p class="description">Wait for data available on a connection.</p>
<p class="code">
int httpWait (<br>
<a href="#http_t">http_t</a> *http,<br>
int msec<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>msec</dt>
<dd class="description">Milliseconds to wait</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">1 if data is available, 0 otherwise</p>
<h3 class="function"><span class="info"> DEPRECATED </span><a name="httpWrite">httpWrite</a></h3>
<p class="description">Write data to a HTTP connection.</p>
<p class="code">
int httpWrite (<br>
<a href="#http_t">http_t</a> *http,<br>
const char *buffer,<br>
int length<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>buffer</dt>
<dd class="description">Buffer for data</dd>
<dt>length</dt>
<dd class="description">Number of bytes to write</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Number of bytes written</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">This function is deprecated. Use the httpWrite2() function which can
write more than 2GB of data.
</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="httpWrite2">httpWrite2</a></h3>
<p class="description">Write data to a HTTP connection.</p>
<p class="code">
ssize_t httpWrite2 (<br>
<a href="#http_t">http_t</a> *http,<br>
const char *buffer,<br>
size_t length<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">Connection to server</dd>
<dt>buffer</dt>
<dd class="description">Buffer for data</dd>
<dt>length</dt>
<dd class="description">Number of bytes to write</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Number of bytes written</p>
<h3 class="function"><a name="ippAddBoolean">ippAddBoolean</a></h3>
<p class="description">Add a boolean attribute to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddBoolean (<br>
<a href="#ipp_t">ipp_t</a> *ipp,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> group,<br>
const char *name,<br>
char value<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">IPP message</dd>
<dt>group</dt>
<dd class="description">IPP group</dd>
<dt>name</dt>
<dd class="description">Name of attribute</dd>
<dt>value</dt>
<dd class="description">Value of attribute</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New attribute</p>
<h3 class="function"><a name="ippAddBooleans">ippAddBooleans</a></h3>
<p class="description">Add an array of boolean values.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddBooleans (<br>
<a href="#ipp_t">ipp_t</a> *ipp,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> group,<br>
const char *name,<br>
int num_values,<br>
const char *values<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">IPP message</dd>
<dt>group</dt>
<dd class="description">IPP group</dd>
<dt>name</dt>
<dd class="description">Name of attribute</dd>
<dt>num_values</dt>
<dd class="description">Number of values</dd>
<dt>values</dt>
<dd class="description">Values</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New attribute</p>
<h3 class="function"><span class="info"> CUPS 1.1.19/Mac OS X 10.3 </span><a name="ippAddCollection">ippAddCollection</a></h3>
<p class="description">Add a collection value.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddCollection (<br>
<a href="#ipp_t">ipp_t</a> *ipp,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> group,<br>
const char *name,<br>
<a href="#ipp_t">ipp_t</a> *value<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">IPP message</dd>
<dt>group</dt>
<dd class="description">IPP group</dd>
<dt>name</dt>
<dd class="description">Name of attribute</dd>
<dt>value</dt>
<dd class="description">Value</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New attribute</p>
<h3 class="function"><span class="info"> CUPS 1.1.19/Mac OS X 10.3 </span><a name="ippAddCollections">ippAddCollections</a></h3>
<p class="description">Add an array of collection values.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddCollections (<br>
<a href="#ipp_t">ipp_t</a> *ipp,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> group,<br>
const char *name,<br>
int num_values,<br>
const <a href="#ipp_t">ipp_t</a> **values<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">IPP message</dd>
<dt>group</dt>
<dd class="description">IPP group</dd>
<dt>name</dt>
<dd class="description">Name of attribute</dd>
<dt>num_values</dt>
<dd class="description">Number of values</dd>
<dt>values</dt>
<dd class="description">Values</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New attribute</p>
<h3 class="function"><a name="ippAddDate">ippAddDate</a></h3>
<p class="description">Add a date attribute to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddDate (<br>
<a href="#ipp_t">ipp_t</a> *ipp,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> group,<br>
const char *name,<br>
const <a href="#ipp_uchar_t">ipp_uchar_t</a> *value<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">IPP message</dd>
<dt>group</dt>
<dd class="description">IPP group</dd>
<dt>name</dt>
<dd class="description">Name of attribute</dd>
<dt>value</dt>
<dd class="description">Value</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New attribute</p>
<h3 class="function"><a name="ippAddInteger">ippAddInteger</a></h3>
<p class="description">Add a integer attribute to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddInteger (<br>
<a href="#ipp_t">ipp_t</a> *ipp,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> group,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> type,<br>
const char *name,<br>
int value<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">IPP message</dd>
<dt>group</dt>
<dd class="description">IPP group</dd>
<dt>type</dt>
<dd class="description">Type of attribute</dd>
<dt>name</dt>
<dd class="description">Name of attribute</dd>
<dt>value</dt>
<dd class="description">Value of attribute</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New attribute</p>
<h3 class="function"><a name="ippAddIntegers">ippAddIntegers</a></h3>
<p class="description">Add an array of integer values.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddIntegers (<br>
<a href="#ipp_t">ipp_t</a> *ipp,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> group,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> type,<br>
const char *name,<br>
int num_values,<br>
const int *values<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">IPP message</dd>
<dt>group</dt>
<dd class="description">IPP group</dd>
<dt>type</dt>
<dd class="description">Type of attribute</dd>
<dt>name</dt>
<dd class="description">Name of attribute</dd>
<dt>num_values</dt>
<dd class="description">Number of values</dd>
<dt>values</dt>
<dd class="description">Values</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New attribute</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="ippAddOctetString">ippAddOctetString</a></h3>
<p class="description">Add an octetString value to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddOctetString (<br>
<a href="#ipp_t">ipp_t</a> *ipp,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> group,<br>
const char *name,<br>
const void *data,<br>
int datalen<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">IPP message</dd>
<dt>group</dt>
<dd class="description">IPP group</dd>
<dt>name</dt>
<dd class="description">Name of attribute</dd>
<dt>data</dt>
<dd class="description">octetString data</dd>
<dt>datalen</dt>
<dd class="description">Length of data in bytes</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New attribute</p>
<h3 class="function"><a name="ippAddRange">ippAddRange</a></h3>
<p class="description">Add a range of values to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddRange (<br>
<a href="#ipp_t">ipp_t</a> *ipp,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> group,<br>
const char *name,<br>
int lower,<br>
int upper<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">IPP message</dd>
<dt>group</dt>
<dd class="description">IPP group</dd>
<dt>name</dt>
<dd class="description">Name of attribute</dd>
<dt>lower</dt>
<dd class="description">Lower value</dd>
<dt>upper</dt>
<dd class="description">Upper value</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New attribute</p>
<h3 class="function"><a name="ippAddRanges">ippAddRanges</a></h3>
<p class="description">Add ranges of values to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddRanges (<br>
<a href="#ipp_t">ipp_t</a> *ipp,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> group,<br>
const char *name,<br>
int num_values,<br>
const int *lower,<br>
const int *upper<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">IPP message</dd>
<dt>group</dt>
<dd class="description">IPP group</dd>
<dt>name</dt>
<dd class="description">Name of attribute</dd>
<dt>num_values</dt>
<dd class="description">Number of values</dd>
<dt>lower</dt>
<dd class="description">Lower values</dd>
<dt>upper</dt>
<dd class="description">Upper values</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New attribute</p>
<h3 class="function"><a name="ippAddResolution">ippAddResolution</a></h3>
<p class="description">Add a resolution value to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddResolution (<br>
<a href="#ipp_t">ipp_t</a> *ipp,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> group,<br>
const char *name,<br>
<a href="#ipp_res_t">ipp_res_t</a> units,<br>
int xres,<br>
int yres<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">IPP message</dd>
<dt>group</dt>
<dd class="description">IPP group</dd>
<dt>name</dt>
<dd class="description">Name of attribute</dd>
<dt>units</dt>
<dd class="description">Units for resolution</dd>
<dt>xres</dt>
<dd class="description">X resolution</dd>
<dt>yres</dt>
<dd class="description">Y resolution</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New attribute</p>
<h3 class="function"><a name="ippAddResolutions">ippAddResolutions</a></h3>
<p class="description">Add resolution values to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddResolutions (<br>
<a href="#ipp_t">ipp_t</a> *ipp,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> group,<br>
const char *name,<br>
int num_values,<br>
<a href="#ipp_res_t">ipp_res_t</a> units,<br>
const int *xres,<br>
const int *yres<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">IPP message</dd>
<dt>group</dt>
<dd class="description">IPP group</dd>
<dt>name</dt>
<dd class="description">Name of attribute</dd>
<dt>num_values</dt>
<dd class="description">Number of values</dd>
<dt>units</dt>
<dd class="description">Units for resolution</dd>
<dt>xres</dt>
<dd class="description">X resolutions</dd>
<dt>yres</dt>
<dd class="description">Y resolutions</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New attribute</p>
<h3 class="function"><a name="ippAddSeparator">ippAddSeparator</a></h3>
<p class="description">Add a group separator to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddSeparator (<br>
<a href="#ipp_t">ipp_t</a> *ipp<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">IPP message</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New attribute</p>
<h3 class="function"><a name="ippAddString">ippAddString</a></h3>
<p class="description">Add a language-encoded string to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddString (<br>
<a href="#ipp_t">ipp_t</a> *ipp,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> group,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> type,<br>
const char *name,<br>
const char *charset,<br>
const char *value<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">IPP message</dd>
<dt>group</dt>
<dd class="description">IPP group</dd>
<dt>type</dt>
<dd class="description">Type of attribute</dd>
<dt>name</dt>
<dd class="description">Name of attribute</dd>
<dt>charset</dt>
<dd class="description">Character set</dd>
<dt>value</dt>
<dd class="description">Value</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New attribute</p>
<h3 class="function"><a name="ippAddStrings">ippAddStrings</a></h3>
<p class="description">Add language-encoded strings to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddStrings (<br>
<a href="#ipp_t">ipp_t</a> *ipp,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> group,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> type,<br>
const char *name,<br>
int num_values,<br>
const char *charset,<br>
const char *const *values<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">IPP message</dd>
<dt>group</dt>
<dd class="description">IPP group</dd>
<dt>type</dt>
<dd class="description">Type of attribute</dd>
<dt>name</dt>
<dd class="description">Name of attribute</dd>
<dt>num_values</dt>
<dd class="description">Number of values</dd>
<dt>charset</dt>
<dd class="description">Character set</dd>
<dt>values</dt>
<dd class="description">Values</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New attribute</p>
<h3 class="function"><a name="ippDateToTime">ippDateToTime</a></h3>
<p class="description">Convert from RFC 1903 Date/Time format to UNIX time
in seconds.</p>
<p class="code">
time_t ippDateToTime (<br>
const <a href="#ipp_uchar_t">ipp_uchar_t</a> *date<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>date</dt>
<dd class="description">RFC 1903 date info</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">UNIX time value</p>
<h3 class="function"><a name="ippDelete">ippDelete</a></h3>
<p class="description">Delete an IPP message.</p>
<p class="code">
void ippDelete (<br>
<a href="#ipp_t">ipp_t</a> *ipp<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">IPP message</dd>
</dl>
<h3 class="function"><span class="info"> CUPS 1.1.19/Mac OS X 10.3 </span><a name="ippDeleteAttribute">ippDeleteAttribute</a></h3>
<p class="description">Delete a single attribute in an IPP message.</p>
<p class="code">
void ippDeleteAttribute (<br>
<a href="#ipp_t">ipp_t</a> *ipp,<br>
<a href="#ipp_attribute_t">ipp_attribute_t</a> *attr<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">IPP message</dd>
<dt>attr</dt>
<dd class="description">Attribute to delete</dd>
</dl>
<h3 class="function"><a name="ippErrorString">ippErrorString</a></h3>
<p class="description">Return a name for the given status code.</p>
<p class="code">
const char *ippErrorString (<br>
ipp_status_t error<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>error</dt>
<dd class="description">Error status</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Text string</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="ippErrorValue">ippErrorValue</a></h3>
<p class="description">Return a status code for the given name.</p>
<p class="code">
ipp_status_t ippErrorValue (<br>
const char *name<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>name</dt>
<dd class="description">Name</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">IPP status code</p>
<h3 class="function"><a name="ippFindAttribute">ippFindAttribute</a></h3>
<p class="description">Find a named attribute in a request...</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippFindAttribute (<br>
<a href="#ipp_t">ipp_t</a> *ipp,<br>
const char *name,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> type<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">IPP message</dd>
<dt>name</dt>
<dd class="description">Name of attribute</dd>
<dt>type</dt>
<dd class="description">Type of attribute</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Matching attribute</p>
<h3 class="function"><a name="ippFindNextAttribute">ippFindNextAttribute</a></h3>
<p class="description">Find the next named attribute in a request...</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippFindNextAttribute (<br>
<a href="#ipp_t">ipp_t</a> *ipp,<br>
const char *name,<br>
<a href="#ipp_tag_t">ipp_tag_t</a> type<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">IPP message</dd>
<dt>name</dt>
<dd class="description">Name of attribute</dd>
<dt>type</dt>
<dd class="description">Type of attribute</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Matching attribute</p>
<h3 class="function"><a name="ippLength">ippLength</a></h3>
<p class="description">Compute the length of an IPP message.</p>
<p class="code">
size_t ippLength (<br>
<a href="#ipp_t">ipp_t</a> *ipp<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>ipp</dt>
<dd class="description">IPP message</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Size of IPP message</p>
<h3 class="function"><a name="ippNew">ippNew</a></h3>
<p class="description">Allocate a new IPP message.</p>
<p class="code">
<a href="#ipp_t">ipp_t</a> *ippNew (void);</p>
<h4 class="returnvalue">Return Value</h4>
<p class="description">New IPP message</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="ippNewRequest">ippNewRequest</a></h3>
<p class="description">Allocate a new IPP request message.</p>
<p class="code">
<a href="#ipp_t">ipp_t</a> *ippNewRequest (<br>
<a href="#ipp_op_t">ipp_op_t</a> op<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>op</dt>
<dd class="description">Operation code</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">IPP request message</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">The new request message is initialized with the attributes-charset and
attributes-natural-language attributes added. The
attributes-natural-language value is derived from the current locale.
</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="ippOpString">ippOpString</a></h3>
<p class="description">Return a name for the given operation id.</p>
<p class="code">
const char *ippOpString (<br>
<a href="#ipp_op_t">ipp_op_t</a> op<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>op</dt>
<dd class="description">Operation ID</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Name</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="ippOpValue">ippOpValue</a></h3>
<p class="description">Return an operation id for the given name.</p>
<p class="code">
<a href="#ipp_op_t">ipp_op_t</a> ippOpValue (<br>
const char *name<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>name</dt>
<dd class="description">Textual name</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Operation ID</p>
<h3 class="function"><a name="ippPort">ippPort</a></h3>
<p class="description">Return the default IPP port number.</p>
<p class="code">
int ippPort (void);</p>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Port number</p>
<h3 class="function"><a name="ippRead">ippRead</a></h3>
<p class="description">Read data for an IPP message from a HTTP connection.</p>
<p class="code">
<a href="#ipp_state_t">ipp_state_t</a> ippRead (<br>
<a href="#http_t">http_t</a> *http,<br>
<a href="#ipp_t">ipp_t</a> *ipp<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">HTTP connection</dd>
<dt>ipp</dt>
<dd class="description">IPP data</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Current state</p>
<h3 class="function"><span class="info"> CUPS 1.1.19/Mac OS X 10.3 </span><a name="ippReadFile">ippReadFile</a></h3>
<p class="description">Read data for an IPP message from a file.</p>
<p class="code">
<a href="#ipp_state_t">ipp_state_t</a> ippReadFile (<br>
int fd,<br>
<a href="#ipp_t">ipp_t</a> *ipp<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>fd</dt>
<dd class="description">HTTP data</dd>
<dt>ipp</dt>
<dd class="description">IPP data</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Current state</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="ippReadIO">ippReadIO</a></h3>
<p class="description">Read data for an IPP message.</p>
<p class="code">
<a href="#ipp_state_t">ipp_state_t</a> ippReadIO (<br>
void *src,<br>
<a href="#ipp_iocb_t">ipp_iocb_t</a> cb,<br>
int blocking,<br>
<a href="#ipp_t">ipp_t</a> *parent,<br>
<a href="#ipp_t">ipp_t</a> *ipp<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>src</dt>
<dd class="description">Data source</dd>
<dt>cb</dt>
<dd class="description">Read callback function</dd>
<dt>blocking</dt>
<dd class="description">Use blocking IO?</dd>
<dt>parent</dt>
<dd class="description">Parent request, if any</dd>
<dt>ipp</dt>
<dd class="description">IPP data</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Current state</p>
<h3 class="function"><a name="ippSetPort">ippSetPort</a></h3>
<p class="description">Set the default port number.</p>
<p class="code">
void ippSetPort (<br>
int p<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>p</dt>
<dd class="description">Port number to use</dd>
</dl>
<h3 class="function"><span class="info"> CUPS 1.4/Mac OS X 10.6 </span><a name="ippTagString">ippTagString</a></h3>
<p class="description">Return the tag name corresponding to a tag value.</p>
<p class="code">
const char *ippTagString (<br>
<a href="#ipp_tag_t">ipp_tag_t</a> tag<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>tag</dt>
<dd class="description">Tag value</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Tag name</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">The returned names are defined in RFC 2911 and 3382.
</p>
<h3 class="function"><span class="info"> CUPS 1.4/Mac OS X 10.6 </span><a name="ippTagValue">ippTagValue</a></h3>
<p class="description">Return the tag value corresponding to a tag name.</p>
<p class="code">
<a href="#ipp_tag_t">ipp_tag_t</a> ippTagValue (<br>
const char *name<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>name</dt>
<dd class="description">Tag name</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Tag value</p>
<h4 class="discussion">Discussion</h4>
<p class="discussion">The tag names are defined in RFC 2911 and 3382.
</p>
<h3 class="function"><a name="ippTimeToDate">ippTimeToDate</a></h3>
<p class="description">Convert from UNIX time to RFC 1903 format.</p>
<p class="code">
const <a href="#ipp_uchar_t">ipp_uchar_t</a> *ippTimeToDate (<br>
time_t t<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>t</dt>
<dd class="description">UNIX time value</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">RFC-1903 date/time data</p>
<h3 class="function"><a name="ippWrite">ippWrite</a></h3>
<p class="description">Write data for an IPP message to a HTTP connection.</p>
<p class="code">
<a href="#ipp_state_t">ipp_state_t</a> ippWrite (<br>
<a href="#http_t">http_t</a> *http,<br>
<a href="#ipp_t">ipp_t</a> *ipp<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>http</dt>
<dd class="description">HTTP connection</dd>
<dt>ipp</dt>
<dd class="description">IPP data</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Current state</p>
<h3 class="function"><span class="info"> CUPS 1.1.19/Mac OS X 10.3 </span><a name="ippWriteFile">ippWriteFile</a></h3>
<p class="description">Write data for an IPP message to a file.</p>
<p class="code">
<a href="#ipp_state_t">ipp_state_t</a> ippWriteFile (<br>
int fd,<br>
<a href="#ipp_t">ipp_t</a> *ipp<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>fd</dt>
<dd class="description">HTTP data</dd>
<dt>ipp</dt>
<dd class="description">IPP data</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Current state</p>
<h3 class="function"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="ippWriteIO">ippWriteIO</a></h3>
<p class="description">Write data for an IPP message.</p>
<p class="code">
<a href="#ipp_state_t">ipp_state_t</a> ippWriteIO (<br>
void *dst,<br>
<a href="#ipp_iocb_t">ipp_iocb_t</a> cb,<br>
int blocking,<br>
<a href="#ipp_t">ipp_t</a> *parent,<br>
<a href="#ipp_t">ipp_t</a> *ipp<br>
);</p>
<h4 class="parameters">Parameters</h4>
<dl>
<dt>dst</dt>
<dd class="description">Destination</dd>
<dt>cb</dt>
<dd class="description">Write callback function</dd>
<dt>blocking</dt>
<dd class="description">Use blocking IO?</dd>
<dt>parent</dt>
<dd class="description">Parent IPP message</dd>
<dt>ipp</dt>
<dd class="description">IPP data</dd>
</dl>
<h4 class="returnvalue">Return Value</h4>
<p class="description">Current state</p>
<h2 class="title"><a name="TYPES">Data Types</a></h2>
<h3 class="typedef"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="http_addr_t">http_addr_t</a></h3>
<p class="description">Socket address union, which
makes using IPv6 and other
address types easier and
more portable. </p>
<p class="code">
typedef union _http_addr_u / http_addr_t;
</p>
<h3 class="typedef"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="http_addrlist_t">http_addrlist_t</a></h3>
<p class="description">Socket address list, which is
used to enumerate all of the
addresses that are associated
with a hostname. </p>
<p class="code">
typedef struct <a href="#http_addrlist_s">http_addrlist_s</a> / http_addrlist_t;
</p>
<h3 class="typedef"><a name="http_auth_t">http_auth_t</a></h3>
<p class="description">HTTP authentication types</p>
<p class="code">
typedef enum <a href="#http_auth_e">http_auth_e</a> http_auth_t;
</p>
<h3 class="typedef"><a name="http_encoding_t">http_encoding_t</a></h3>
<p class="description">HTTP transfer encoding values</p>
<p class="code">
typedef enum <a href="#http_encoding_e">http_encoding_e</a> http_encoding_t;
</p>
<h3 class="typedef"><a name="http_encryption_t">http_encryption_t</a></h3>
<p class="description">HTTP encryption values</p>
<p class="code">
typedef enum <a href="#http_encryption_e">http_encryption_e</a> http_encryption_t;
</p>
<h3 class="typedef"><a name="http_field_t">http_field_t</a></h3>
<p class="description">HTTP field names</p>
<p class="code">
typedef enum <a href="#http_field_e">http_field_e</a> http_field_t;
</p>
<h3 class="typedef"><a name="http_keepalive_t">http_keepalive_t</a></h3>
<p class="description">HTTP keep-alive values</p>
<p class="code">
typedef enum <a href="#http_keepalive_e">http_keepalive_e</a> http_keepalive_t;
</p>
<h3 class="typedef"><a name="http_state_t">http_state_t</a></h3>
<p class="description">HTTP state values; states
are server-oriented...</p>
<p class="code">
typedef enum <a href="#http_state_e">http_state_e</a> / http_state_t;
</p>
<h3 class="typedef"><a name="http_status_t">http_status_t</a></h3>
<p class="description">HTTP status codes</p>
<p class="code">
typedef enum <a href="#http_status_e">http_status_e</a> http_status_t;
</p>
<h3 class="typedef"><a name="http_t">http_t</a></h3>
<p class="description">HTTP connection type</p>
<p class="code">
typedef struct _http_s http_t;
</p>
<h3 class="typedef"><a name="http_uri_coding_t">http_uri_coding_t</a></h3>
<p class="description">URI en/decode flags</p>
<p class="code">
typedef enum <a href="#http_uri_coding_e">http_uri_coding_e</a> http_uri_coding_t;
</p>
<h3 class="typedef"><span class="info"> CUPS1.2 </span><a name="http_uri_status_t">http_uri_status_t</a></h3>
<p class="description">URI separation status </p>
<p class="code">
typedef enum <a href="#http_uri_status_e">http_uri_status_e</a> http_uri_status_t;
</p>
<h3 class="typedef"><a name="http_version_t">http_version_t</a></h3>
<p class="description">HTTP version numbers</p>
<p class="code">
typedef enum <a href="#http_version_e">http_version_e</a> http_version_t;
</p>
<h3 class="typedef"><a name="ipp_attribute_t">ipp_attribute_t</a></h3>
<p class="description">Attribute</p>
<p class="code">
typedef struct <a href="#ipp_attribute_s">ipp_attribute_s</a> ipp_attribute_t;
</p>
<h3 class="typedef"><a name="ipp_finish_t">ipp_finish_t</a></h3>
<p class="description">Finishings</p>
<p class="code">
typedef enum <a href="#ipp_finish_e">ipp_finish_e</a> ipp_finish_t;
</p>
<h3 class="typedef"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="ipp_iocb_t">ipp_iocb_t</a></h3>
<p class="description">IPP IO Callback Function </p>
<p class="code">
typedef ssize_t (*ipp_iocb_t)(void *, <a href="#ipp_uchar_t">ipp_uchar_t</a> *, size_t);
</p>
<h3 class="typedef"><a name="ipp_jstate_t">ipp_jstate_t</a></h3>
<p class="description">Job states</p>
<p class="code">
typedef enum <a href="#ipp_jstate_e">ipp_jstate_e</a> ipp_jstate_t;
</p>
<h3 class="typedef"><a name="ipp_op_t">ipp_op_t</a></h3>
<p class="description">IPP operations</p>
<p class="code">
typedef enum <a href="#ipp_op_e">ipp_op_e</a> ipp_op_t;
</p>
<h3 class="typedef"><a name="ipp_orient_t">ipp_orient_t</a></h3>
<p class="description">Orientation values</p>
<p class="code">
typedef enum <a href="#ipp_orient_e">ipp_orient_e</a> ipp_orient_t;
</p>
<h3 class="typedef"><a name="ipp_pstate_t">ipp_pstate_t</a></h3>
<p class="description">Printer states</p>
<p class="code">
typedef enum <a href="#ipp_pstate_e">ipp_pstate_e</a> ipp_pstate_t;
</p>
<h3 class="typedef"><a name="ipp_quality_t">ipp_quality_t</a></h3>
<p class="description">Qualities</p>
<p class="code">
typedef enum <a href="#ipp_quality_e">ipp_quality_e</a> ipp_quality_t;
</p>
<h3 class="typedef"><a name="ipp_request_t">ipp_request_t</a></h3>
<p class="description">Request Header</p>
<p class="code">
typedef union <a href="#ipp_request_u">ipp_request_u</a> ipp_request_t;
</p>
<h3 class="typedef"><a name="ipp_res_t">ipp_res_t</a></h3>
<p class="description">Resolution units</p>
<p class="code">
typedef enum <a href="#ipp_res_e">ipp_res_e</a> ipp_res_t;
</p>
<h3 class="typedef"><a name="ipp_state_t">ipp_state_t</a></h3>
<p class="description">IPP states</p>
<p class="code">
typedef enum <a href="#ipp_state_e">ipp_state_e</a> ipp_state_t;
</p>
<h3 class="typedef"><a name="ipp_t">ipp_t</a></h3>
<p class="description">Attribute Value</p>
<p class="code">
typedef struct <a href="#ipp_s">ipp_s</a> ipp_t;
</p>
<h3 class="typedef"><a name="ipp_uchar_t">ipp_uchar_t</a></h3>
<p class="description">IPP status codes</p>
<p class="code">
typedef typedef unsigned char ipp_uchar_t;
</p>
<h3 class="typedef"><a name="ipp_tag_t">ipp_tag_t</a></h3>
<p class="description">Format tags for attributes</p>
<p class="code">
typedef enum <a href="#ipp_tag_e">ipp_tag_e</a> ipp_tag_t;
</p>
<h3 class="typedef"><a name="ipp_value_t">ipp_value_t</a></h3>
<p class="description">Attribute Value</p>
<p class="code">
typedef union <a href="#ipp_value_u">ipp_value_u</a> ipp_value_t;
</p>
<h2 class="title"><a name="STRUCTURES">Structures</a></h2>
<h3 class="struct"><span class="info"> CUPS 1.2/Mac OS X 10.5 </span><a name="http_addrlist_s">http_addrlist_s</a></h3>
<p class="description">Socket address list, which is
used to enumerate all of the
addresses that are associated
with a hostname. </p>
<p class="code">struct http_addrlist_s {<br>
<a href="#http_addr_t">http_addr_t</a> addr;<br>
struct <a href="#http_addrlist_s">http_addrlist_s</a> *next;<br>
};</p>
<h4 class="members">Members</h4>
<dl>
<dt>addr </dt>
<dd class="description">Address</dd>
<dt>next </dt>
<dd class="description">Pointer to next address in list</dd>
</dl>
<h3 class="struct"><a name="ipp_attribute_s">ipp_attribute_s</a></h3>
<p class="description">Attribute</p>
<p class="code">struct ipp_attribute_s {<br>
char *name;<br>
struct <a href="#ipp_attribute_s">ipp_attribute_s</a> *next;<br>
int num_values;<br>
<a href="#ipp_tag_t">ipp_tag_t</a> group_tag, value_tag;<br>
<a href="#ipp_value_t">ipp_value_t</a> values[1];<br>
};</p>
<h4 class="members">Members</h4>
<dl>
<dt>name </dt>
<dd class="description">Name of attribute</dd>
<dt>next </dt>
<dd class="description">Next attribute in list</dd>
<dt>num_values </dt>
<dd class="description">Number of values</dd>
<dt>value_tag </dt>
<dd class="description">What type of value is it?</dd>
<dt>values[1] </dt>
<dd class="description">Values</dd>
</dl>
<h3 class="struct"><a name="ipp_s">ipp_s</a></h3>
<p class="description">IPP Request/Response/Notification</p>
<p class="code">struct ipp_s {<br>
<a href="#ipp_attribute_t">ipp_attribute_t</a> *attrs;<br>
<a href="#ipp_attribute_t">ipp_attribute_t</a> *current;<br>
<a href="#ipp_tag_t">ipp_tag_t</a> curtag;<br>
<a href="#ipp_attribute_t">ipp_attribute_t</a> *last;<br>
<a href="#ipp_attribute_t">ipp_attribute_t</a> *prev;<br>
<a href="#ipp_request_t">ipp_request_t</a> request;<br>
<a href="#ipp_state_t">ipp_state_t</a> state;<br>
int use;<br>
};</p>
<h4 class="members">Members</h4>
<dl>
<dt>attrs </dt>
<dd class="description">Attributes</dd>
<dt>current </dt>
<dd class="description">Current attribute (for read/write)</dd>
<dt>curtag </dt>
<dd class="description">Current attribute group tag</dd>
<dt>last </dt>
<dd class="description">Last attribute in list</dd>
<dt>prev <span class="info"> CUPS 1.2/Mac OS X 10.5 </span></dt>
<dd class="description">Previous attribute (for read) </dd>
<dt>request </dt>
<dd class="description">Request header</dd>
<dt>state </dt>
<dd class="description">State of request</dd>
<dt>use </dt>
<dd class="description">Use count</dd>
</dl>
<h2 class="title"><a name="UNIONS">Unions</a></h2>
<h3 class="union"><a name="ipp_request_u">ipp_request_u</a></h3>
<p class="description">Request Header</p>
<p class="code">union ipp_request_u {<br>
};</p>
<h4 class="members">Members</h4>
<dl>
</dl>
<h3 class="union"><a name="ipp_value_u">ipp_value_u</a></h3>
<p class="description">Attribute Value</p>
<p class="code">union ipp_value_u {<br>
char boolean;<br>
<a href="#ipp_t">ipp_t</a> *collection;<br>
<a href="#ipp_uchar_t">ipp_uchar_t</a> date[11];<br>
int integer;<br>
};</p>
<h4 class="members">Members</h4>
<dl>
<dt>boolean </dt>
<dd class="description">Boolean value</dd>
<dt>collection <span class="info"> CUPS 1.1.19/Mac OS X 10.3 </span></dt>
<dd class="description">Collection value </dd>
<dt>date[11] </dt>
<dd class="description">Date/time value</dd>
<dt>integer </dt>
<dd class="description">Integer/enumerated value</dd>
</dl>
<h2 class="title"><a name="ENUMERATIONS">Constants</a></h2>
<h3 class="enumeration"><a name="http_auth_e">http_auth_e</a></h3>
<p class="description">HTTP authentication types</p>
<h4 class="constants">Constants</h4>
<dl>
<dt>HTTP_AUTH_BASIC </dt>
<dd class="description">Basic authentication in use</dd>
<dt>HTTP_AUTH_MD5 </dt>
<dd class="description">Digest authentication in use</dd>
<dt>HTTP_AUTH_MD5_INT </dt>
<dd class="description">Digest authentication in use for body</dd>
<dt>HTTP_AUTH_MD5_SESS </dt>
<dd class="description">MD5-session authentication in use</dd>
<dt>HTTP_AUTH_MD5_SESS_INT </dt>
<dd class="description">MD5-session authentication in use for body</dd>
<dt>HTTP_AUTH_NEGOTIATE <span class="info"> CUPS 1.3/Mac OS X 10.5 </span></dt>
<dd class="description">GSSAPI authentication in use </dd>
<dt>HTTP_AUTH_NONE </dt>
<dd class="description">No authentication in use</dd>
</dl>
<h3 class="enumeration"><a name="http_encoding_e">http_encoding_e</a></h3>
<p class="description">HTTP transfer encoding values</p>
<h4 class="constants">Constants</h4>
<dl>
<dt>HTTP_ENCODE_CHUNKED </dt>
<dd class="description">Data is chunked</dd>
<dt>HTTP_ENCODE_FIELDS </dt>
<dd class="description">Sending HTTP fields</dd>
<dt>HTTP_ENCODE_LENGTH </dt>
<dd class="description">Data is sent with Content-Length</dd>
</dl>
<h3 class="enumeration"><a name="http_encryption_e">http_encryption_e</a></h3>
<p class="description">HTTP encryption values</p>
<h4 class="constants">Constants</h4>
<dl>
<dt>HTTP_ENCRYPT_ALWAYS </dt>
<dd class="description">Always encrypt (SSL)</dd>
<dt>HTTP_ENCRYPT_IF_REQUESTED </dt>
<dd class="description">Encrypt if requested (TLS upgrade)</dd>
<dt>HTTP_ENCRYPT_NEVER </dt>
<dd class="description">Never encrypt</dd>
<dt>HTTP_ENCRYPT_REQUIRED </dt>
<dd class="description">Encryption is required (TLS upgrade)</dd>
</dl>
<h3 class="enumeration"><a name="http_field_e">http_field_e</a></h3>
<p class="description">HTTP field names</p>
<h4 class="constants">Constants</h4>
<dl>
<dt>HTTP_FIELD_ACCEPT_LANGUAGE </dt>
<dd class="description">Accept-Language field</dd>
<dt>HTTP_FIELD_ACCEPT_RANGES </dt>
<dd class="description">Accept-Ranges field</dd>
<dt>HTTP_FIELD_AUTHORIZATION </dt>
<dd class="description">Authorization field</dd>
<dt>HTTP_FIELD_CONNECTION </dt>
<dd class="description">Connection field</dd>
<dt>HTTP_FIELD_CONTENT_ENCODING </dt>
<dd class="description">Content-Encoding field</dd>
<dt>HTTP_FIELD_CONTENT_LANGUAGE </dt>
<dd class="description">Content-Language field</dd>
<dt>HTTP_FIELD_CONTENT_LENGTH </dt>
<dd class="description">Content-Length field</dd>
<dt>HTTP_FIELD_CONTENT_LOCATION </dt>
<dd class="description">Content-Location field</dd>
<dt>HTTP_FIELD_CONTENT_MD5 </dt>
<dd class="description">Content-MD5 field</dd>
<dt>HTTP_FIELD_CONTENT_RANGE </dt>
<dd class="description">Content-Range field</dd>
<dt>HTTP_FIELD_CONTENT_TYPE </dt>
<dd class="description">Content-Type field</dd>
<dt>HTTP_FIELD_CONTENT_VERSION </dt>
<dd class="description">Content-Version field</dd>
<dt>HTTP_FIELD_DATE </dt>
<dd class="description">Date field</dd>
<dt>HTTP_FIELD_HOST </dt>
<dd class="description">Host field</dd>
<dt>HTTP_FIELD_IF_MODIFIED_SINCE </dt>
<dd class="description">If-Modified-Since field</dd>
<dt>HTTP_FIELD_IF_UNMODIFIED_SINCE </dt>
<dd class="description">If-Unmodified-Since field</dd>
<dt>HTTP_FIELD_KEEP_ALIVE </dt>
<dd class="description">Keep-Alive field</dd>
<dt>HTTP_FIELD_LAST_MODIFIED </dt>
<dd class="description">Last-Modified field</dd>
<dt>HTTP_FIELD_LINK </dt>
<dd class="description">Link field</dd>
<dt>HTTP_FIELD_LOCATION </dt>
<dd class="description">Location field</dd>
<dt>HTTP_FIELD_MAX </dt>
<dd class="description">Maximum field index</dd>
<dt>HTTP_FIELD_RANGE </dt>
<dd class="description">Range field</dd>
<dt>HTTP_FIELD_REFERER </dt>
<dd class="description">Referer field</dd>
<dt>HTTP_FIELD_RETRY_AFTER </dt>
<dd class="description">Retry-After field</dd>
<dt>HTTP_FIELD_TRANSFER_ENCODING </dt>
<dd class="description">Transfer-Encoding field</dd>
<dt>HTTP_FIELD_UNKNOWN </dt>
<dd class="description">Unknown field</dd>
<dt>HTTP_FIELD_UPGRADE </dt>
<dd class="description">Upgrade field</dd>
<dt>HTTP_FIELD_USER_AGENT </dt>
<dd class="description">User-Agent field</dd>
<dt>HTTP_FIELD_WWW_AUTHENTICATE </dt>
<dd class="description">WWW-Authenticate field</dd>
</dl>
<h3 class="enumeration"><a name="http_keepalive_e">http_keepalive_e</a></h3>
<p class="description">HTTP keep-alive values</p>
<h4 class="constants">Constants</h4>
<dl>
<dt>HTTP_KEEPALIVE_OFF </dt>
<dd class="description">No keep alive support</dd>
<dt>HTTP_KEEPALIVE_ON </dt>
<dd class="description">Use keep alive</dd>
</dl>
<h3 class="enumeration"><a name="http_state_e">http_state_e</a></h3>
<p class="description">HTTP state values; states
are server-oriented...</p>
<h4 class="constants">Constants</h4>
<dl>
<dt>HTTP_CLOSE </dt>
<dd class="description">CLOSE command, waiting for blank line</dd>
<dt>HTTP_DELETE </dt>
<dd class="description">DELETE command, waiting for blank line</dd>
<dt>HTTP_GET </dt>
<dd class="description">GET command, waiting for blank line</dd>
<dt>HTTP_GET_SEND </dt>
<dd class="description">GET command, sending data</dd>
<dt>HTTP_HEAD </dt>
<dd class="description">HEAD command, waiting for blank line</dd>
<dt>HTTP_OPTIONS </dt>
<dd class="description">OPTIONS command, waiting for blank line</dd>
<dt>HTTP_POST </dt>
<dd class="description">POST command, waiting for blank line</dd>
<dt>HTTP_POST_RECV </dt>
<dd class="description">POST command, receiving data</dd>
<dt>HTTP_POST_SEND </dt>
<dd class="description">POST command, sending data</dd>
<dt>HTTP_PUT </dt>
<dd class="description">PUT command, waiting for blank line</dd>
<dt>HTTP_PUT_RECV </dt>
<dd class="description">PUT command, receiving data</dd>
<dt>HTTP_STATUS </dt>
<dd class="description">Command complete, sending status</dd>
<dt>HTTP_TRACE </dt>
<dd class="description">TRACE command, waiting for blank line</dd>
<dt>HTTP_WAITING </dt>
<dd class="description">Waiting for command</dd>
</dl>
<h3 class="enumeration"><a name="http_status_e">http_status_e</a></h3>
<p class="description">HTTP status codes</p>
<h4 class="constants">Constants</h4>
<dl>
<dt>HTTP_ACCEPTED </dt>
<dd class="description">DELETE command was successful</dd>
<dt>HTTP_AUTHORIZATION_CANCELED </dt>
<dd class="description">User cancelled authorization</dd>
<dt>HTTP_BAD_GATEWAY </dt>
<dd class="description">Bad gateway</dd>
<dt>HTTP_BAD_REQUEST </dt>
<dd class="description">Bad request</dd>
<dt>HTTP_CONFLICT </dt>
<dd class="description">Request is self-conflicting</dd>
<dt>HTTP_CONTINUE </dt>
<dd class="description">Everything OK, keep going...</dd>
<dt>HTTP_CREATED </dt>
<dd class="description">PUT command was successful</dd>
<dt>HTTP_ERROR </dt>
<dd class="description">An error response from httpXxxx()</dd>
<dt>HTTP_EXPECTATION_FAILED </dt>
<dd class="description">The expectation given in an Expect header field was not met</dd>
<dt>HTTP_FORBIDDEN </dt>
<dd class="description">Forbidden to access this URI</dd>
<dt>HTTP_GATEWAY_TIMEOUT </dt>
<dd class="description">Gateway connection timed out</dd>
<dt>HTTP_GONE </dt>
<dd class="description">Server has gone away</dd>
<dt>HTTP_LENGTH_REQUIRED </dt>
<dd class="description">A content length or encoding is required</dd>
<dt>HTTP_METHOD_NOT_ALLOWED </dt>
<dd class="description">Method is not allowed</dd>
<dt>HTTP_MOVED_PERMANENTLY </dt>
<dd class="description">Document has moved permanently</dd>
<dt>HTTP_MOVED_TEMPORARILY </dt>
<dd class="description">Document has moved temporarily</dd>
<dt>HTTP_MULTIPLE_CHOICES </dt>
<dd class="description">Multiple files match request</dd>
<dt>HTTP_NOT_ACCEPTABLE </dt>
<dd class="description">Not Acceptable</dd>
<dt>HTTP_NOT_AUTHORITATIVE </dt>
<dd class="description">Information isn't authoritative</dd>
<dt>HTTP_NOT_FOUND </dt>
<dd class="description">URI was not found</dd>
<dt>HTTP_NOT_IMPLEMENTED </dt>
<dd class="description">Feature not implemented</dd>
<dt>HTTP_NOT_MODIFIED </dt>
<dd class="description">File not modified</dd>
<dt>HTTP_NOT_SUPPORTED </dt>
<dd class="description">HTTP version not supported</dd>
<dt>HTTP_NO_CONTENT </dt>
<dd class="description">Successful command, no new data</dd>
<dt>HTTP_OK </dt>
<dd class="description">OPTIONS/GET/HEAD/POST/TRACE command was successful</dd>
<dt>HTTP_PARTIAL_CONTENT </dt>
<dd class="description">Only a partial file was recieved/sent</dd>
<dt>HTTP_PAYMENT_REQUIRED </dt>
<dd class="description">Payment required</dd>
<dt>HTTP_PRECONDITION </dt>
<dd class="description">Precondition failed</dd>
<dt>HTTP_PROXY_AUTHENTICATION </dt>
<dd class="description">Proxy Authentication is Required</dd>
<dt>HTTP_REQUESTED_RANGE </dt>
<dd class="description">The requested range is not satisfiable</dd>
<dt>HTTP_REQUEST_TIMEOUT </dt>
<dd class="description">Request timed out</dd>
<dt>HTTP_REQUEST_TOO_LARGE </dt>
<dd class="description">Request entity too large</dd>
<dt>HTTP_RESET_CONTENT </dt>
<dd class="description">Content was reset/recreated</dd>
<dt>HTTP_SEE_OTHER </dt>
<dd class="description">See this other link...</dd>
<dt>HTTP_SERVER_ERROR </dt>
<dd class="description">Internal server error</dd>
<dt>HTTP_SERVICE_UNAVAILABLE </dt>
<dd class="description">Service is unavailable</dd>
<dt>HTTP_SWITCHING_PROTOCOLS </dt>
<dd class="description">HTTP upgrade to TLS/SSL</dd>
<dt>HTTP_UNAUTHORIZED </dt>
<dd class="description">Unauthorized to access host</dd>
<dt>HTTP_UNSUPPORTED_MEDIATYPE </dt>
<dd class="description">The requested media type is unsupported</dd>
<dt>HTTP_UPGRADE_REQUIRED </dt>
<dd class="description">Upgrade to SSL/TLS required</dd>
<dt>HTTP_URI_TOO_LONG </dt>
<dd class="description">URI too long</dd>
<dt>HTTP_USE_PROXY </dt>
<dd class="description">Must use a proxy to access this URI</dd>
</dl>
<h3 class="enumeration"><a name="http_uri_coding_e">http_uri_coding_e</a></h3>
<p class="description">URI en/decode flags</p>
<h4 class="constants">Constants</h4>
<dl>
<dt>HTTP_URI_CODING_ALL </dt>
<dd class="description">En/decode everything</dd>
<dt>HTTP_URI_CODING_HOSTNAME </dt>
<dd class="description">En/decode the hostname portion</dd>
<dt>HTTP_URI_CODING_MOST </dt>
<dd class="description">En/decode all but the query</dd>
<dt>HTTP_URI_CODING_NONE </dt>
<dd class="description">Don't en/decode anything</dd>
<dt>HTTP_URI_CODING_QUERY </dt>
<dd class="description">En/decode the query portion</dd>
<dt>HTTP_URI_CODING_RESOURCE </dt>
<dd class="description">En/decode the resource portion</dd>
<dt>HTTP_URI_CODING_USERNAME </dt>
<dd class="description">En/decode the username portion</dd>
</dl>
<h3 class="enumeration"><span class="info"> CUPS1.2 </span><a name="http_uri_status_e">http_uri_status_e</a></h3>
<p class="description">URI separation status </p>
<h4 class="constants">Constants</h4>
<dl>
<dt>HTTP_URI_BAD_ARGUMENTS </dt>
<dd class="description">Bad arguments to function (error)</dd>
<dt>HTTP_URI_BAD_HOSTNAME </dt>
<dd class="description">Bad hostname in URI (error)</dd>
<dt>HTTP_URI_BAD_PORT </dt>
<dd class="description">Bad port number in URI (error)</dd>
<dt>HTTP_URI_BAD_RESOURCE </dt>
<dd class="description">Bad resource in URI (error)</dd>
<dt>HTTP_URI_BAD_SCHEME </dt>
<dd class="description">Bad scheme in URI (error)</dd>
<dt>HTTP_URI_BAD_URI </dt>
<dd class="description">Bad/empty URI (error)</dd>
<dt>HTTP_URI_BAD_USERNAME </dt>
<dd class="description">Bad username in URI (error)</dd>
<dt>HTTP_URI_MISSING_RESOURCE </dt>
<dd class="description">Missing resource in URI (warning)</dd>
<dt>HTTP_URI_MISSING_SCHEME </dt>
<dd class="description">Missing scheme in URI (warning)</dd>
<dt>HTTP_URI_OK </dt>
<dd class="description">URI decoded OK</dd>
<dt>HTTP_URI_OVERFLOW </dt>
<dd class="description">URI buffer for httpAssembleURI is too small</dd>
<dt>HTTP_URI_UNKNOWN_SCHEME </dt>
<dd class="description">Unknown scheme in URI (warning)</dd>
</dl>
<h3 class="enumeration"><a name="http_version_e">http_version_e</a></h3>
<p class="description">HTTP version numbers</p>
<h4 class="constants">Constants</h4>
<dl>
<dt>HTTP_0_9 </dt>
<dd class="description">HTTP/0.9</dd>
<dt>HTTP_1_0 </dt>
<dd class="description">HTTP/1.0</dd>
<dt>HTTP_1_1 </dt>
<dd class="description">HTTP/1.1</dd>
</dl>
<h3 class="enumeration"><a name="ipp_finish_e">ipp_finish_e</a></h3>
<p class="description">Finishings</p>
<h4 class="constants">Constants</h4>
<dl>
<dt>IPP_FINISHINGS_BALE </dt>
<dd class="description">Bale (any type)</dd>
<dt>IPP_FINISHINGS_BIND </dt>
<dd class="description">Bind</dd>
<dt>IPP_FINISHINGS_BIND_BOTTOM </dt>
<dd class="description">Bind on bottom</dd>
<dt>IPP_FINISHINGS_BIND_LEFT </dt>
<dd class="description">Bind on left</dd>
<dt>IPP_FINISHINGS_BIND_RIGHT </dt>
<dd class="description">Bind on right</dd>
<dt>IPP_FINISHINGS_BIND_TOP </dt>
<dd class="description">Bind on top</dd>
<dt>IPP_FINISHINGS_BOOKLET_MAKER </dt>
<dd class="description">Fold to make booklet</dd>
<dt>IPP_FINISHINGS_COVER </dt>
<dd class="description">Add cover</dd>
<dt>IPP_FINISHINGS_EDGE_STITCH </dt>
<dd class="description">Stitch along any side</dd>
<dt>IPP_FINISHINGS_EDGE_STITCH_BOTTOM </dt>
<dd class="description">Stitch along bottom edge</dd>
<dt>IPP_FINISHINGS_EDGE_STITCH_LEFT </dt>
<dd class="description">Stitch along left side</dd>
<dt>IPP_FINISHINGS_EDGE_STITCH_RIGHT </dt>
<dd class="description">Stitch along right side</dd>
<dt>IPP_FINISHINGS_EDGE_STITCH_TOP </dt>
<dd class="description">Stitch along top edge</dd>
<dt>IPP_FINISHINGS_FOLD </dt>
<dd class="description">Fold (any type)</dd>
<dt>IPP_FINISHINGS_JOB_OFFSET </dt>
<dd class="description">Offset for binding (any type)</dd>
<dt>IPP_FINISHINGS_NONE </dt>
<dd class="description">No finishing</dd>
<dt>IPP_FINISHINGS_PUNCH </dt>
<dd class="description">Punch (any location/count)</dd>
<dt>IPP_FINISHINGS_SADDLE_STITCH </dt>
<dd class="description">Staple interior</dd>
<dt>IPP_FINISHINGS_STAPLE </dt>
<dd class="description">Staple (any location)</dd>
<dt>IPP_FINISHINGS_STAPLE_BOTTOM_LEFT </dt>
<dd class="description">Staple bottom left corner</dd>
<dt>IPP_FINISHINGS_STAPLE_BOTTOM_RIGHT </dt>
<dd class="description">Staple bottom right corner</dd>
<dt>IPP_FINISHINGS_STAPLE_DUAL_BOTTOM </dt>
<dd class="description">Two staples on bottom</dd>
<dt>IPP_FINISHINGS_STAPLE_DUAL_LEFT </dt>
<dd class="description">Two staples on left</dd>
<dt>IPP_FINISHINGS_STAPLE_DUAL_RIGHT </dt>
<dd class="description">Two staples on right</dd>
<dt>IPP_FINISHINGS_STAPLE_DUAL_TOP </dt>
<dd class="description">Two staples on top</dd>
<dt>IPP_FINISHINGS_STAPLE_TOP_LEFT </dt>
<dd class="description">Staple top left corner</dd>
<dt>IPP_FINISHINGS_STAPLE_TOP_RIGHT </dt>
<dd class="description">Staple top right corner</dd>
<dt>IPP_FINISHINGS_TRIM </dt>
<dd class="description">Trim (any type)</dd>
</dl>
<h3 class="enumeration"><a name="ipp_jstate_e">ipp_jstate_e</a></h3>
<p class="description">Job states</p>
<h4 class="constants">Constants</h4>
<dl>
<dt>IPP_JOB_ABORTED </dt>
<dd class="description">Job has aborted due to error</dd>
<dt>IPP_JOB_CANCELED </dt>
<dd class="description">Job has been canceled</dd>
<dt>IPP_JOB_COMPLETED </dt>
<dd class="description">Job has completed successfully</dd>
<dt>IPP_JOB_HELD </dt>
<dd class="description">Job is held for printing</dd>
<dt>IPP_JOB_PENDING </dt>
<dd class="description">Job is waiting to be printed</dd>
<dt>IPP_JOB_PROCESSING </dt>
<dd class="description">Job is currently printing</dd>
<dt>IPP_JOB_STOPPED </dt>
<dd class="description">Job has been stopped</dd>
</dl>
<h3 class="enumeration"><a name="ipp_op_e">ipp_op_e</a></h3>
<p class="description">IPP operations</p>
<h4 class="constants">Constants</h4>
<dl>
<dt>CUPS_ACCEPT_JOBS </dt>
<dd class="description">Accept new jobs on a printer</dd>
<dt>CUPS_ADD_MODIFY_CLASS </dt>
<dd class="description">Add or modify a class</dd>
<dt>CUPS_ADD_MODIFY_PRINTER </dt>
<dd class="description">Add or modify a printer</dd>
<dt>CUPS_AUTHENTICATE_JOB <span class="info"> CUPS 1.2/Mac OS X 10.5 </span></dt>
<dd class="description">Authenticate a job </dd>
<dt>CUPS_DELETE_CLASS </dt>
<dd class="description">Delete a class</dd>
<dt>CUPS_DELETE_PRINTER </dt>
<dd class="description">Delete a printer</dd>
<dt>CUPS_GET_CLASSES <span class="info"> DEPRECATED </span></dt>
<dd class="description">Get a list of classes </dd>
<dt>CUPS_GET_DEFAULT </dt>
<dd class="description">Get the default printer</dd>
<dt>CUPS_GET_DEVICES </dt>
<dd class="description">Get a list of supported devices</dd>
<dt>CUPS_GET_DOCUMENT <span class="info"> CUPS 1.4/Mac OS X 10.6 </span></dt>
<dd class="description">Get a document file </dd>
<dt>CUPS_GET_PPD <span class="info"> CUPS 1.3/Mac OS X 10.5 </span></dt>
<dd class="description">Get a PPD file </dd>
<dt>CUPS_GET_PPDS </dt>
<dd class="description">Get a list of supported drivers</dd>
<dt>CUPS_GET_PRINTERS </dt>
<dd class="description">Get a list of printers and/or classes</dd>
<dt>CUPS_MOVE_JOB </dt>
<dd class="description">Move a job to a different printer</dd>
<dt>CUPS_REJECT_JOBS </dt>
<dd class="description">Reject new jobs on a printer</dd>
<dt>CUPS_SET_DEFAULT </dt>
<dd class="description">Set the default printer</dd>
<dt>IPP_CANCEL_JOB </dt>
<dd class="description">Cancel a job</dd>
<dt>IPP_CANCEL_SUBSCRIPTION <span class="info"> CUPS 1.2/Mac OS X 10.5 </span></dt>
<dd class="description">Cancel a subscription </dd>
<dt>IPP_CREATE_JOB </dt>
<dd class="description">Create an empty print job</dd>
<dt>IPP_CREATE_JOB_SUBSCRIPTION <span class="info"> CUPS 1.2/Mac OS X 10.5 </span></dt>
<dd class="description">Create a job subscription </dd>
<dt>IPP_CREATE_PRINTER_SUBSCRIPTION <span class="info"> CUPS 1.2/Mac OS X 10.5 </span></dt>
<dd class="description">Create a printer subscription </dd>
<dt>IPP_DISABLE_PRINTER </dt>
<dd class="description">Stop a printer</dd>
<dt>IPP_ENABLE_PRINTER </dt>
<dd class="description">Start a printer</dd>
<dt>IPP_GET_JOBS </dt>
<dd class="description">Get a list of jobs</dd>
<dt>IPP_GET_JOB_ATTRIBUTES </dt>
<dd class="description">Get job attributes</dd>
<dt>IPP_GET_NOTIFICATIONS <span class="info"> CUPS 1.2/Mac OS X 10.5 </span></dt>
<dd class="description">Get notification events </dd>
<dt>IPP_GET_PRINTER_ATTRIBUTES </dt>
<dd class="description">Get printer attributes</dd>
<dt>IPP_GET_PRINTER_SUPPORTED_VALUES </dt>
<dd class="description">Get supported attribute values</dd>
<dt>IPP_GET_SUBSCRIPTIONS <span class="info"> CUPS 1.2/Mac OS X 10.5 </span></dt>
<dd class="description">Get list of subscriptions </dd>
<dt>IPP_GET_SUBSCRIPTION_ATTRIBUTES <span class="info"> CUPS 1.2/Mac OS X 10.5 </span></dt>
<dd class="description">Get subscription attributes </dd>
<dt>IPP_HOLD_JOB </dt>
<dd class="description">Hold a job for printing</dd>
<dt>IPP_PAUSE_PRINTER </dt>
<dd class="description">Stop a printer</dd>
<dt>IPP_PRINT_JOB </dt>
<dd class="description">Print a single file</dd>
<dt>IPP_PURGE_JOBS </dt>
<dd class="description">Cancel all jobs</dd>
<dt>IPP_RELEASE_JOB </dt>
<dd class="description">Release a job for printing</dd>
<dt>IPP_RENEW_SUBSCRIPTION <span class="info"> CUPS 1.2/Mac OS X 10.5 </span></dt>
<dd class="description">Renew a printer subscription </dd>
<dt>IPP_RESTART_JOB </dt>
<dd class="description">Reprint a job</dd>
<dt>IPP_RESUME_PRINTER </dt>
<dd class="description">Start a printer</dd>
<dt>IPP_SEND_DOCUMENT </dt>
<dd class="description">Add a file to a job</dd>
<dt>IPP_SET_JOB_ATTRIBUTES </dt>
<dd class="description">Set job attributes</dd>
<dt>IPP_VALIDATE_JOB </dt>
<dd class="description">Validate job options</dd>
</dl>
<h3 class="enumeration"><a name="ipp_orient_e">ipp_orient_e</a></h3>
<p class="description">Orientation values</p>
<h4 class="constants">Constants</h4>
<dl>
<dt>IPP_LANDSCAPE </dt>
<dd class="description">90 degrees counter-clockwise</dd>
<dt>IPP_PORTRAIT </dt>
<dd class="description">No rotation</dd>
<dt>IPP_REVERSE_LANDSCAPE </dt>
<dd class="description">90 degrees clockwise</dd>
<dt>IPP_REVERSE_PORTRAIT </dt>
<dd class="description">180 degrees</dd>
</dl>
<h3 class="enumeration"><a name="ipp_pstate_e">ipp_pstate_e</a></h3>
<p class="description">Printer states</p>
<h4 class="constants">Constants</h4>
<dl>
<dt>IPP_PRINTER_IDLE </dt>
<dd class="description">Printer is idle</dd>
<dt>IPP_PRINTER_PROCESSING </dt>
<dd class="description">Printer is working</dd>
<dt>IPP_PRINTER_STOPPED </dt>
<dd class="description">Printer is stopped</dd>
</dl>
<h3 class="enumeration"><a name="ipp_quality_e">ipp_quality_e</a></h3>
<p class="description">Qualities</p>
<h4 class="constants">Constants</h4>
<dl>
<dt>IPP_QUALITY_DRAFT </dt>
<dd class="description">Draft quality</dd>
<dt>IPP_QUALITY_HIGH </dt>
<dd class="description">High quality</dd>
<dt>IPP_QUALITY_NORMAL </dt>
<dd class="description">Normal quality</dd>
</dl>
<h3 class="enumeration"><a name="ipp_res_e">ipp_res_e</a></h3>
<p class="description">Resolution units</p>
<h4 class="constants">Constants</h4>
<dl>
<dt>IPP_RES_PER_CM </dt>
<dd class="description">Pixels per centimeter</dd>
<dt>IPP_RES_PER_INCH </dt>
<dd class="description">Pixels per inch</dd>
</dl>
<h3 class="enumeration"><a name="ipp_state_e">ipp_state_e</a></h3>
<p class="description">IPP states</p>
<h4 class="constants">Constants</h4>
<dl>
<dt>IPP_ATTRIBUTE </dt>
<dd class="description">One or more attributes need to be sent/received</dd>
<dt>IPP_DATA </dt>
<dd class="description">IPP request data needs to be sent/received</dd>
<dt>IPP_ERROR </dt>
<dd class="description">An error occurred</dd>
<dt>IPP_HEADER </dt>
<dd class="description">The request header needs to be sent/received</dd>
<dt>IPP_IDLE </dt>
<dd class="description">Nothing is happening/request completed</dd>
</dl>
<h3 class="enumeration"><a name="ipp_status_e">ipp_status_e</a></h3>
<p class="description">IPP status codes</p>
<h4 class="constants">Constants</h4>
<dl>
<dt>CUPS_SEE_OTHER </dt>
<dd class="description">cups-see-other</dd>
<dt>IPP_ATTRIBUTES </dt>
<dd class="description">client-error-attributes-or-values-not-supported</dd>
<dt>IPP_ATTRIBUTES_NOT_SETTABLE </dt>
<dd class="description">client-error-attributes-not-settable</dd>
<dt>IPP_BAD_REQUEST </dt>
<dd class="description">client-error-bad-request</dd>
<dt>IPP_CHARSET </dt>
<dd class="description">client-error-charset-not-supported</dd>
<dt>IPP_COMPRESSION_ERROR </dt>
<dd class="description">client-error-compression-error</dd>
<dt>IPP_COMPRESSION_NOT_SUPPORTED </dt>
<dd class="description">client-error-compression-not-supported</dd>
<dt>IPP_CONFLICT </dt>
<dd class="description">client-error-conflicting-attributes</dd>
<dt>IPP_DEVICE_ERROR </dt>
<dd class="description">server-error-device-error</dd>
<dt>IPP_DOCUMENT_ACCESS_ERROR </dt>
<dd class="description">client-error-document-access-error</dd>
<dt>IPP_DOCUMENT_FORMAT </dt>
<dd class="description">client-error-document-format-not-supported</dd>
<dt>IPP_DOCUMENT_FORMAT_ERROR </dt>
<dd class="description">client-error-document-format-error</dd>
<dt>IPP_ERROR_JOB_CANCELED </dt>
<dd class="description">server-error-job-canceled</dd>
<dt>IPP_FORBIDDEN </dt>
<dd class="description">client-error-forbidden</dd>
<dt>IPP_GONE </dt>
<dd class="description">client-error-gone</dd>
<dt>IPP_IGNORED_ALL_NOTIFICATIONS </dt>
<dd class="description">client-error-ignored-all-notifications</dd>
<dt>IPP_IGNORED_ALL_SUBSCRIPTIONS </dt>
<dd class="description">client-error-ignored-all-subscriptions</dd>
<dt>IPP_INTERNAL_ERROR </dt>
<dd class="description">server-error-internal-error</dd>
<dt>IPP_MULTIPLE_JOBS_NOT_SUPPORTED </dt>
<dd class="description">server-error-multiple-document-jobs-not-supported</dd>
<dt>IPP_NOT_ACCEPTING </dt>
<dd class="description">server-error-not-accepting-jobs</dd>
<dt>IPP_NOT_AUTHENTICATED </dt>
<dd class="description">client-error-not-authenticated</dd>
<dt>IPP_NOT_AUTHORIZED </dt>
<dd class="description">client-error-not-authorized</dd>
<dt>IPP_NOT_FOUND </dt>
<dd class="description">client-error-not-found</dd>
<dt>IPP_NOT_POSSIBLE </dt>
<dd class="description">client-error-not-possible</dd>
<dt>IPP_OK </dt>
<dd class="description">successful-ok</dd>
<dt>IPP_OK_BUT_CANCEL_SUBSCRIPTION </dt>
<dd class="description">successful-ok-but-cancel-subscription</dd>
<dt>IPP_OK_CONFLICT </dt>
<dd class="description">successful-ok-conflicting-attributes</dd>
<dt>IPP_OK_EVENTS_COMPLETE </dt>
<dd class="description">successful-ok-events-complete</dd>
<dt>IPP_OK_IGNORED_NOTIFICATIONS </dt>
<dd class="description">successful-ok-ignored-notifications</dd>
<dt>IPP_OK_IGNORED_SUBSCRIPTIONS </dt>
<dd class="description">successful-ok-ignored-subscriptions</dd>
<dt>IPP_OK_SUBST </dt>
<dd class="description">successful-ok-ignored-or-substituted-attributes</dd>
<dt>IPP_OK_TOO_MANY_EVENTS </dt>
<dd class="description">successful-ok-too-many-events</dd>
<dt>IPP_OPERATION_NOT_SUPPORTED </dt>
<dd class="description">server-error-operation-not-supported</dd>
<dt>IPP_PRINTER_BUSY </dt>
<dd class="description">server-error-busy</dd>
<dt>IPP_PRINTER_IS_DEACTIVATED </dt>
<dd class="description">server-error-printer-is-deactivated</dd>
<dt>IPP_PRINT_SUPPORT_FILE_NOT_FOUND </dt>
<dd class="description">client-error-print-support-file-not-found</dd>
<dt>IPP_REQUEST_ENTITY </dt>
<dd class="description">client-error-request-entity-too-large</dd>
<dt>IPP_REQUEST_VALUE </dt>
<dd class="description">client-error-request-value-too-long</dd>
<dt>IPP_SERVICE_UNAVAILABLE </dt>
<dd class="description">server-error-service-unavailable</dd>
<dt>IPP_TEMPORARY_ERROR </dt>
<dd class="description">server-error-temporary-error</dd>
<dt>IPP_TIMEOUT </dt>
<dd class="description">client-error-timeout</dd>
<dt>IPP_TOO_MANY_SUBSCRIPTIONS </dt>
<dd class="description">client-error-too-many-subscriptions</dd>
<dt>IPP_URI_SCHEME </dt>
<dd class="description">client-error-uri-scheme-not-supported</dd>
<dt>IPP_VERSION_NOT_SUPPORTED </dt>
<dd class="description">server-error-version-not-supported</dd>
</dl>
<h3 class="enumeration"><a name="ipp_tag_e">ipp_tag_e</a></h3>
<p class="description">Format tags for attributes</p>
<h4 class="constants">Constants</h4>
<dl>
<dt>IPP_TAG_ADMINDEFINE </dt>
<dd class="description">Admin-defined value</dd>
<dt>IPP_TAG_BEGIN_COLLECTION </dt>
<dd class="description">Beginning of collection value</dd>
<dt>IPP_TAG_BOOLEAN </dt>
<dd class="description">Boolean value</dd>
<dt>IPP_TAG_CHARSET </dt>
<dd class="description">Character set value</dd>
<dt>IPP_TAG_COPY </dt>
<dd class="description">Bitflag for copied attribute values</dd>
<dt>IPP_TAG_DATE </dt>
<dd class="description">Date/time value</dd>
<dt>IPP_TAG_DEFAULT </dt>
<dd class="description">Default value</dd>
<dt>IPP_TAG_DELETEATTR </dt>
<dd class="description">Delete-attribute value</dd>
<dt>IPP_TAG_END </dt>
<dd class="description">End-of-attributes</dd>
<dt>IPP_TAG_END_COLLECTION </dt>
<dd class="description">End of collection value</dd>
<dt>IPP_TAG_ENUM </dt>
<dd class="description">Enumeration value</dd>
<dt>IPP_TAG_EVENT_NOTIFICATION </dt>
<dd class="description">Event group</dd>
<dt>IPP_TAG_INTEGER </dt>
<dd class="description">Integer value</dd>
<dt>IPP_TAG_JOB </dt>
<dd class="description">Job group</dd>
<dt>IPP_TAG_KEYWORD </dt>
<dd class="description">Keyword value</dd>
<dt>IPP_TAG_LANGUAGE </dt>
<dd class="description">Language value</dd>
<dt>IPP_TAG_MASK </dt>
<dd class="description">Mask for copied attribute values</dd>
<dt>IPP_TAG_MEMBERNAME </dt>
<dd class="description">Collection member name value</dd>
<dt>IPP_TAG_MIMETYPE </dt>
<dd class="description">MIME media type value</dd>
<dt>IPP_TAG_NAME </dt>
<dd class="description">Name value</dd>
<dt>IPP_TAG_NAMELANG </dt>
<dd class="description">Name-with-language value</dd>
<dt>IPP_TAG_NOTSETTABLE </dt>
<dd class="description">Not-settable value</dd>
<dt>IPP_TAG_NOVALUE </dt>
<dd class="description">No-value value</dd>
<dt>IPP_TAG_OPERATION </dt>
<dd class="description">Operation group</dd>
<dt>IPP_TAG_PRINTER </dt>
<dd class="description">Printer group</dd>
<dt>IPP_TAG_RANGE </dt>
<dd class="description">Range value</dd>
<dt>IPP_TAG_RESOLUTION </dt>
<dd class="description">Resolution value</dd>
<dt>IPP_TAG_STRING </dt>
<dd class="description">Octet string value</dd>
<dt>IPP_TAG_SUBSCRIPTION </dt>
<dd class="description">Subscription group</dd>
<dt>IPP_TAG_TEXT </dt>
<dd class="description">Text value</dd>
<dt>IPP_TAG_TEXTLANG </dt>
<dd class="description">Text-with-language value</dd>
<dt>IPP_TAG_UNKNOWN </dt>
<dd class="description">Unknown value</dd>
<dt>IPP_TAG_UNSUPPORTED_GROUP </dt>
<dd class="description">Unsupported attributes group</dd>
<dt>IPP_TAG_UNSUPPORTED_VALUE </dt>
<dd class="description">Unsupported value</dd>
<dt>IPP_TAG_URI </dt>
<dd class="description">URI value</dd>
<dt>IPP_TAG_URISCHEME </dt>
<dd class="description">URI scheme value</dd>
<dt>IPP_TAG_ZERO </dt>
<dd class="description">Zero tag - used for separators</dd>
</dl>
</div>
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