{* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *}

(**
 * @file  http_core.h
 * @brief CORE HTTP Daemon
 *
 * @defgroup APACHE_CORE_HTTPD Core HTTP Daemon
 * @ingroup  APACHE_CORE
 * @{
 *)

//#ifndef APACHE_HTTP_CORE_H
//#define APACHE_HTTP_CORE_H

//#include "apr.h"
//#include "apr_hash.h"
//#include "apr_optional.h"
{$include util_filter.inc}
{$include ap_expr.inc}
//#include "apr_tables.h"

//#include "http_config.h"

//#if APR_HAVE_STRUCT_RLIMIT
//#include <sys/time.h>
//#include <sys/resource.h>
//#endif


{* ****************************************************************
 *
 * The most basic server code is encapsulated in a single module
 * known as the core, which is just *barely* functional enough to
 * serve documents, though not terribly well.
 *
 * Largely for NCSA back-compatibility reasons, the core needs to
 * make pieces of its config structures available to other modules.
 * The accessors are declared here, along with the interpretation
 * of one of them (allow_options).
 *}

(**
 * @defgroup APACHE_CORE_HTTPD_ACESSORS Acessors
 *
 * @brief File/Directory Accessor directives
 *
 * @{
 *)
const
//** No directives */
  OPT_NONE          = 0;
//** Indexes directive */
  OPT_INDEXES       = 1;
//** SSI is enabled without exec= permission  */
  OPT_INCLUDES      = 2;
//**  FollowSymLinks directive */
  OPT_SYM_LINKS     = 4;
//**  ExecCGI directive */
  OPT_EXECCGI       = 8;
//**  directive unset */
  OPT_UNSET         = 16;
//**  SSI exec= permission is permitted, iff OPT_INCLUDES is also set */
  OPT_INC_WITH_EXEC = 32;
//** SymLinksIfOwnerMatch directive */
  OPT_SYM_OWNER     = 64;
//** MultiViews directive */
  OPT_MULTI         = 128;
//**  All directives */
  OPT_ALL           = (OPT_INDEXES or OPT_INCLUDES or OPT_INC_WITH_EXEC or OPT_SYM_LINKS or OPT_EXECCGI);
(** @} *)

(**
 * @defgroup get_remote_host Remote Host Resolution
 * @ingroup APACHE_CORE_HTTPD
 * @{
 *)
{** REMOTE_HOST returns the hostname, or NULL if the hostname
 * lookup fails.  It will force a DNS lookup according to the
 * HostnameLookups setting.
 *}
  REMOTE_HOST = 0;

{** REMOTE_NAME returns the hostname, or the dotted quad if the
 * hostname lookup fails.  It will force a DNS lookup according
 * to the HostnameLookups setting.
 *}
  REMOTE_NAME = 1;

{** REMOTE_NOLOOKUP is like REMOTE_NAME except that a DNS lookup is
 * never forced.
 *}
  REMOTE_NOLOOKUP = 2;

{** REMOTE_DOUBLE_REV will always force a DNS lookup, and also force
 * a double reverse lookup, regardless of the HostnameLookups
 * setting.  The result is the (double reverse checked) hostname,
 * or NULL if any of the lookups fail.
 *}
  REMOTE_DOUBLE_REV = 3;

(** @} // get_remote_host *)

//** all of the requirements must be met */
  SATISFY_ALL = 0;
//**  any of the requirements must be met */
  SATISFY_ANY = 1;
//** There are no applicable satisfy lines */
  SATISFY_NOSPEC = 2;

{** Make sure we don't write less than 8000 bytes at any one time.
 *}
  AP_MIN_BYTES_TO_WRITE  = 8000;

//** default maximum of internal redirects */
  AP_DEFAULT_MAX_INTERNAL_REDIRECTS  = 10;

//** default maximum subrequest nesting level */
  AP_DEFAULT_MAX_SUBREQ_DEPTH = 10;

(**
 * Retrieve the value of Options for this request
 * @param r The current request
 * @return the Options bitmask
 *)
//AP_DECLARE(int) ap_allow_options(request_rec *r);
function ap_allow_options(r: Prequest_rec): Integer;
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_allow_options' + LibSuff4;

{**
 * Retrieve the value of the AllowOverride for this request
 * @param r The current request
 * @return the overrides bitmask
 *}
//AP_DECLARE(int) ap_allow_overrides(request_rec *r);
function ap_allow_overrides(r: Prequest_rec): Integer;
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_allow_overrides' + LibSuff4;

{**
 * Retrieve the document root for this server
 * @param r The current request
 * @warning Don't use this!  If your request went through a Userdir, or
 * something like that, it'll screw you.  But it's back-compatible...
 * @return The document root
 *}
//AP_DECLARE(const char *) ap_document_root(request_rec *r);
function ap_document_root(r: Prequest_rec): PChar;
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_document_root' + LibSuff4;

{**
 * Lookup the remote client's DNS name or IP address
 * @ingroup get_remote_host
 * @param conn The current connection
 * @param dir_config The directory config vector from the request
 * @param type The type of lookup to perform.  One of:
 * <pre>
 *     REMOTE_HOST returns the hostname, or NULL if the hostname
 *                 lookup fails.  It will force a DNS lookup according to the
 *                 HostnameLookups setting.
 *     REMOTE_NAME returns the hostname, or the dotted quad if the
 *                 hostname lookup fails.  It will force a DNS lookup according
 *                 to the HostnameLookups setting.
 *     REMOTE_NOLOOKUP is like REMOTE_NAME except that a DNS lookup is
 *                     never forced.
 *     REMOTE_DOUBLE_REV will always force a DNS lookup, and also force
 *                   a double reverse lookup, regardless of the HostnameLookups
 *                   setting.  The result is the (double reverse checked)
 *                   hostname, or NULL if any of the lookups fail.
 * </pre>
 * @param str_is_ip unless NULL is passed, this will be set to non-zero on output when an IP address
 *        string is returned
 * @return The remote hostname
 *}
//AP_DECLARE(const char *) ap_get_remote_host(conn_rec *conn, void *dir_config, int type, int *str_is_ip);
function ap_get_remote_host(conn: Pconn_rec; dir_config: Pointer; _type: Integer; str_is_ip: PInteger): PChar;
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_get_remote_host' + LibSuff16;

{**
 * Retrieve the login name of the remote user.  Undef if it could not be
 * determined
 * @param r The current request
 * @return The user logged in to the client machine
 *}
//AP_DECLARE(const char *) ap_get_remote_logname(request_rec *r);
function ap_get_remote_logname(r: Prequest_rec): PChar;
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_get_remote_logname' + LibSuff4;

{* Used for constructing self-referencing URLs, and things like SERVER_PORT,
 * and SERVER_NAME.
 *}
{**
 * build a fully qualified URL from the uri and information in the request rec
 * @param p The pool to allocate the URL from
 * @param uri The path to the requested file
 * @param r The current request
 * @return A fully qualified URL
 *}
//AP_DECLARE(char *) ap_construct_url(apr_pool_t *p, const char *uri, request_rec *r);
function ap_construct_url(p: Papr_pool_t; const uri: PChar; r: Prequest_rec): PChar;
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_construct_url' + LibSuff12;

{**
 * Get the current server name from the request
 * @param r The current request
 * @return the server name
 *}
//AP_DECLARE(const char *) ap_get_server_name(request_rec *r);
function ap_get_server_name(r: Prequest_rec): PChar;
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_get_server_name' + LibSuff4;

{**
 * Get the current server name from the request for the purposes
 * of using in a URL.  If the server name is an IPv6 literal
 * address, it will be returned in URL format (e.g., "[fe80::1]").
 * @param r The current request
 * @return the server name
 *}
//AP_DECLARE(const char *) ap_get_server_name_for_url(request_rec *r);
function ap_get_server_name_for_url(r: Prequest_rec): PChar;
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_get_server_name_for_url' + LibSuff4;

{**
 * Get the current server port
 * @param r The current request
 * @return The server's port
 *}
//AP_DECLARE(apr_port_t) ap_get_server_port(const request_rec *r);
function ap_get_server_port(r: Prequest_rec): apr_port_t;
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_get_server_port' + LibSuff4;

{**
 * Return the limit on bytes in request msg body
 * @param r The current request
 * @return the maximum number of bytes in the request msg body
 *}
//AP_DECLARE(apr_off_t) ap_get_limit_req_body(const request_rec *r);
function ap_get_limit_req_body(r: Prequest_rec): apr_off_t;
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_get_limit_req_body' + LibSuff4;

{**
 * Return the limit on bytes in XML request msg body
 * @param r The current request
 * @return the maximum number of bytes in XML request msg body
 *}
//AP_DECLARE(apr_size_t) ap_get_limit_xml_body(const request_rec *r);
function ap_get_limit_xml_body(r: Prequest_rec): apr_size_t;
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_get_limit_xml_body' + LibSuff4;

{**
 * Install a custom response handler for a given status
 * @param r The current request
 * @param status The status for which the custom response should be used
 * @param string The custom response.  This can be a static string, a file
 *               or a URL
 *}
//AP_DECLARE(void) ap_custom_response(request_rec *r, int status, const char *string);
procedure ap_custom_response(r: Prequest_rec; status: Integer; const string_: PChar);
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_custom_response' + LibSuff12;

{**
 * Check if the current request is beyond the configured max. number of redirects or subrequests
 * @param r The current request
 * @return true (is exceeded) or false
 *}
//AP_DECLARE(int) ap_is_recursion_limit_exceeded(const request_rec *r);
function ap_is_recursion_limit_exceeded(const r: Prequest_rec): Integer;
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_is_recursion_limit_exceeded' + LibSuff4;

{**
 * Check for a definition from the server command line
 * @param name The define to check for
 * @return 1 if defined, 0 otherwise
 *}
//AP_DECLARE(int) ap_exists_config_define(const char *name);
function ap_exists_config_define(const name: PChar): Integer;
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_exists_config_define' + LibSuff4;
//* FIXME! See STATUS about how */
//AP_DECLARE_NONSTD(int) ap_core_translate(request_rec *r);
function ap_core_translate(r: Prequest_rec): Integer; cdecl;
  external LibHTTPD name 'ap_core_translate';

{* Authentication stuff.  This is one of the places where compatibility
 * with the old config files *really* hurts; they don't discriminate at
 * all between different authentication schemes, meaning that we need
 * to maintain common state for all of them in the core, and make it
 * available to the other modules through interfaces.
 *}

//** @see require_line */
//typedef struct require_line require_line;
type
  Prequire_line = ^require_line;
{**
 * @brief A structure to keep track of authorization requirements
*}
  require_line = record
    //** Where the require line is in the config file. */
    method_mask: apr_int64_t;
    //** The complete string from the command line */
    requirement: PChar;
 end;

{**
 * Return the type of authorization required for this request
 * @param r The current request
 * @return The authorization required
 *}
//AP_DECLARE(const char *) ap_auth_type(request_rec *r);
function ap_auth_type(r: Prequest_rec): PChar;
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_auth_type' + LibSuff4;

{**
 * Return the current Authorization realm
 * @param r The current request
 * @return The current authorization realm
 *}
//AP_DECLARE(const char *) ap_auth_name(request_rec *r);
function ap_auth_name(r: Prequest_rec): PChar;
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_auth_name' + LibSuff4;

{**
 * How the requires lines must be met.
 * @param r The current request
 * @return How the requirements must be met.  One of:
 * <pre>
 *      SATISFY_ANY    -- any of the requirements must be met.
 *      SATISFY_ALL    -- all of the requirements must be met.
 *      SATISFY_NOSPEC -- There are no applicable satisfy lines
 * </pre>
 *}
//AP_DECLARE(int) ap_satisfies(request_rec *r);
function ap_satisfies(r: Prequest_rec): Integer;
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_satisfies' + LibSuff4;

{**
 * Core is also unlike other modules in being implemented in more than
 * one file... so, data structures are declared here, even though most of
 * the code that cares really is in http_core.c.  Also, another accessor.
 *}
//AP_DECLARE_DATA extern module core_module;

{**
 * Accessor for core_module's specific data. Equivalent to
 * ap_get_module_config(cv, &core_module) but more efficient.
 * @param cv The vector in which the modules configuration is stored.
 *        usually r->per_dir_config or s->module_config
 * @return The module-specific data
 *}
//AP_DECLARE(void *) ap_get_core_module_config(const ap_conf_vector_t *cv);
{not found in httpd binary libraries, ignored}

{**
 * Accessor to set core_module's specific data. Equivalent to
 * ap_set_module_config(cv, &core_module, val) but more efficient.
 * @param cv The vector in which the modules configuration is stored.
 *        usually r->per_dir_config or s->module_config
 * @param val The module-specific data to set
 *}
//AP_DECLARE(void) ap_set_core_module_config(ap_conf_vector_t *cv, void *val);
{not found in httpd binary libraries, ignored}

{** Get the socket from the core network filter. This should be used instead of
 * accessing the core connection config directly.
 * @param c The connection record
 * @return The socket
 *}
//AP_DECLARE(apr_socket_t *) ap_get_conn_socket(conn_rec *c);
function ap_get_conn_socket(c: Pconn_rec): Integer;
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_get_conn_socket' + LibSuff4;

//#ifndef AP_DEBUG
//#define AP_CORE_MODULE_INDEX  0
//#define ap_get_core_module_config(v) \
//    (((void **)(v))[AP_CORE_MODULE_INDEX])
//#define ap_set_core_module_config(v, val) \
//    ((((void **)(v))[AP_CORE_MODULE_INDEX]) = (val))
//#else
//#define AP_CORE_MODULE_INDEX  (AP_DEBUG_ASSERT(core_module.module_index == 0), 0)
//#endif

{**
 * @brief  Per-request configuration
*}
type
  core_request_config = record
    {** bucket brigade used by getline for look-ahead and
     * ap_get_client_block for holding left-over request body *}
    bb: Papr_bucket_brigade;

    {** an array of per-request working data elements, accessed
     * by ID using ap_get_request_note()
     * (Use ap_register_request_note() during initialization
     * to add elements)
     *}
    notes: PPointer;

    {** Custom response strings registered via ap_custom_response(),
     * or NULL; check per-dir config if nothing found here
     *}
    response_code_strings: PPChar; {* from ap_custom_response(), not from
                                    * ErrorDocument
                                    *}

    {** per-request document root of the server. This allows mass vhosting
     * modules better compatibility with some scripts. Normally the
     * context_* info should be used instead *}
    document_root: PChar;

    {*
     * more fine-grained context information which is set by modules like
     * mod_alias and mod_userdir
     *}
    {** the context root directory on disk for the current resource,
     *  without trailing slash
     *}
    context_document_root: PChar;
    {** the URI prefix that corresponds to the context_document_root directory,
     *  without trailing slash
     *}
    context_prefix: PChar;

    {** There is a script processor installed on the output filter chain,
     * so it needs the default_handler to deliver a (script) file into
     * the chain so it can process it. Normally, default_handler only
     * serves files on a GET request (assuming the file is actual content),
     * since other methods are not content-retrieval. This flag overrides
     * that behavior, stating that the "content" is actually a script and
     * won't actually be delivered as the response for the non-GET method.
     *}
    deliver_script: Integer;

    {** Should addition of charset= be suppressed for this request?
     *}
    suppress_charset: Integer;
  end;

{* Standard entries that are guaranteed to be accessible via
 * ap_get_request_note() for each request (additional entries
 * can be added with ap_register_request_note())
 *}
const
  AP_NOTE_DIRECTORY_WALK = 0;
  AP_NOTE_LOCATION_WALK  = 1;
  AP_NOTE_FILE_WALK      = 2;
  AP_NOTE_IF_WALK        = 3;
  AP_NUM_STD_NOTES       = 4;

{**
 * Reserve an element in the core_request_config->notes array
 * for some application-specific data
 * @return An integer key that can be passed to ap_get_request_note()
 *         during request processing to access this element for the
 *         current request.
 *}
//AP_DECLARE(apr_size_t) ap_register_request_note(void);
function ap_register_request_note: apr_size_t;
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_register_request_note' + LibSuff0;

{**
 * Retrieve a pointer to an element in the core_request_config->notes array
 * @param r The request
 * @param note_num  A key for the element: either a value obtained from
 *        ap_register_request_note() or one of the predefined AP_NOTE_*
 *        values.
 * @return NULL if the note_num is invalid, otherwise a pointer to the
 *         requested note element.
 * @remark At the start of a request, each note element is NULL.  The
 *         handle provided by ap_get_request_note() is a pointer-to-pointer
 *         so that the caller can point the element to some app-specific
 *         data structure.  The caller should guarantee that any such
 *         structure will last as long as the request itself.
 *}
//AP_DECLARE(void **) ap_get_request_note(request_rec *r, apr_size_t note_num);
 function ap_get_request_note(r: Prequest_rec; note_num: apr_size_t): PPointer;
   {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
   external LibHTTPD name LibNamePrefix + 'ap_get_request_note' + LibSuff8;

type
//typedef unsigned char allow_options_t;
  allow_options_t = cuchar;
//typedef unsigned int overrides_t;
  overrides_t = cuchar;

{*
 * Bits of info that go into making an ETag for a file
 * document.  Why a long?  Because char historically
 * proved too short for Options, and int can be different
 * sizes on different platforms.
 *}
//typedef unsigned long etag_components_t;
  etag_components_t = culong;

const
  ETAG_UNSET    = 0;
  ETAG_NONE     = (1 shl 0);
  ETAG_MTIME    = (1 shl 1);
  ETAG_INODE    = (1 shl 2);
  ETAG_SIZE     = (1 shl 3);
  ETAG_ALL      = (ETAG_MTIME or ETAG_INODE or ETAG_SIZE);
  //* This is the default value used */
  ETAG_BACKWARD = (ETAG_MTIME or ETAG_SIZE);

  //* Hostname resolution etc */
  HOSTNAME_LOOKUP_OFF     = 0;
  HOSTNAME_LOOKUP_ON      = 1;
  HOSTNAME_LOOKUP_DOUBLE  = 2;
  HOSTNAME_LOOKUP_UNSET   = 3;

  USE_CANONICAL_NAME_OFF   = 0;
  USE_CANONICAL_NAME_ON    = 1;
  USE_CANONICAL_NAME_DNS   = 2;
  USE_CANONICAL_NAME_UNSET = 3;

  ADD_DEFAULT_CHARSET_OFF   = 0;
  ADD_DEFAULT_CHARSET_ON    = 1;
  ADD_DEFAULT_CHARSET_UNSET = 2;

  ENABLE_MMAP_OFF    = 0;
  ENABLE_MMAP_ON     = 1;
  ENABLE_MMAP_UNSET  = 2;

  ENABLE_SENDFILE_OFF    = 0;
  ENABLE_SENDFILE_ON     = 1;
  ENABLE_SENDFILE_UNSET  = 2;

  USE_CANONICAL_PHYS_PORT_OFF   = 0;
  USE_CANONICAL_PHYS_PORT_ON    = 1;
  USE_CANONICAL_PHYS_PORT_UNSET = 2;

  AP_CONDITION_IF        = 1;
  AP_CONDITION_ELSE      = 2;
  AP_CONDITION_ELSEIF    = (AP_CONDITION_ELSE or AP_CONDITION_IF);

  AP_MAXRANGES_UNSET     = -1;
  AP_MAXRANGES_DEFAULT   = -2;
  AP_MAXRANGES_UNLIMITED = -3;
  AP_MAXRANGES_NORANGES  =  0;

{**
 * @brief Server Signature Enumeration
 *}
type
  server_signature_e = (
    srv_sig_unset,
    srv_sig_off,
    srv_sig_on,
    srv_sig_withmail
  );

{**
 * @brief Per-directory configuration
 *}
  core_dir_config = record
    //** path of the directory/regex/etc. see also d_is_fnmatch/absolute below */
    d: PChar;
    //** the number of slashes in d */
    d_components: Cardinal;

    {** If (opts & OPT_UNSET) then no absolute assignment to options has
     * been made.
     * invariant: (opts_add & opts_remove) == 0
     * Which said another way means that the last relative (options + or -)
     * assignment made to each bit is recorded in exactly one of opts_add
     * or opts_remove.
     *}
    opts:          allow_options_t;
    opts_add:      allow_options_t;
    opts_remove:   allow_options_t;
    override_:     overrides_t;
    override_opts: allow_options_t;

    {* Custom response config. These can contain text or a URL to redirect to.
     * if response_code_strings is NULL then there are none in the config,
     * if it's not null then it's allocated to sizeof(char*)*RESPONSE_CODES.
     * This lets us do quick merges in merge_core_dir_configs().
     *}

    response_code_strings: PPChar;{* from ErrorDocument, not from
                                   * ap_custom_response() *}

    //* Hostname resolution etc */       {fpc -> consts are moved up}
//#define HOSTNAME_LOOKUP_OFF     0
//#define HOSTNAME_LOOKUP_ON      1
//#define HOSTNAME_LOOKUP_DOUBLE  2
//#define HOSTNAME_LOOKUP_UNSET   3
    flags : cardinal; // takes care of  hostname_lookups, content_md5, use_canonical_name d_is_fnmatch and add_default_charset
//    unsigned int hostname_lookups : 4;

//    unsigned int content_md5 : 2;  //* calculate Content-MD5? */

//#define USE_CANONICAL_NAME_OFF   (0)  {fpc -> consts are moved up}
//#define USE_CANONICAL_NAME_ON    (1)
//#define USE_CANONICAL_NAME_DNS   (2)
//#define USE_CANONICAL_NAME_UNSET (3)
//    unsigned use_canonical_name : 2;

    {* since is_fnmatch(conf->d) was being called so frequently in
     * directory_walk() and its relatives, this field was created and
     * is set to the result of that call.
     *}
//    unsigned d_is_fnmatch : 1;

    {* should we force a charset on any outgoing parameterless content-type?
     * if so, which charset?
     *}
//#define ADD_DEFAULT_CHARSET_OFF   (0)  {fpc -> consts are moved up}
//#define ADD_DEFAULT_CHARSET_ON    (1)
//#define ADD_DEFAULT_CHARSET_UNSET (2)
//    unsigned add_default_charset : 2;
    add_default_charset_name: PChar;

    //* System Resource Control */
{$ifdef RLIMIT_CPU}
    limit_cpu: Prlimit;
{$endif}
{$if defined(RLIMIT_DATA) or defined (RLIMIT_VMEM) or defined(RLIMIT_AS)}
    limit_mem: Prlimit;
{$endif}
{$ifdef RLIMIT_NPROC}
    limit_nproc: Prlimit;
{$endif}
    limit_req_body: apr_off_t;     //* limit on bytes in request msg body */
    limit_xml_body: cLong;         //* limit on bytes in XML request msg body */

    //* logging options */

    server_signature: server_signature_e;

    //* Access control */
    sec_file: Papr_array_header_t;
    sec_if:   Papr_array_header_t;
    r: Pap_regex_t;

    mime_type,                 //* forced with ForceType  */
    handler,                   //* forced with SetHandler */
    output_filters,            //* forced with SetOutputFilters */
    input_filters: PChar;      //* forced with SetInputFilters */
    accept_path_info: Integer; //* forced with AcceptPathInfo */

    {*
     * What attributes/data should be included in ETag generation?
     *}
    etag_bits:   etag_components_t;
    etag_add:    etag_components_t;
    etag_remove: etag_components_t;

    {*
     * Run-time performance tuning
     *}
//#define ENABLE_MMAP_OFF    (0)             {fpc -> consts are moved up}
//#define ENABLE_MMAP_ON     (1)
//#define ENABLE_MMAP_UNSET  (2)
    flags2 : cardinal; // Takes care of   enable_mmap, enable_sendfile, use_canonical_phys_port,
                       //                 allow_encoded_slashes, decode_encoded_slashes and condition_ifelse
//    unsigned int enable_mmap : 2;  //* whether files in this dir can be mmap'ed */

//#define ENABLE_SENDFILE_OFF    (0)         {fpc -> consts are moved up}
//#define ENABLE_SENDFILE_ON     (1)
//#define ENABLE_SENDFILE_UNSET  (2)
//    unsigned int enable_sendfile : 2;  //* files in this dir can be sendfile'ed */

//#define USE_CANONICAL_PHYS_PORT_OFF   (0)  {fpc -> consts are moved up}
//#define USE_CANONICAL_PHYS_PORT_ON    (1)
//#define USE_CANONICAL_PHYS_PORT_UNSET (2)
//    unsigned int use_canonical_phys_port : 2;

//    unsigned int allow_encoded_slashes : 1; {* URLs may contain %2f w/o being
                                             //* pitched indiscriminately *}
//    unsigned int decode_encoded_slashes : 1; //* whether to decode encoded slashes in URLs */

//#define AP_CONDITION_IF        1           {fpc -> consts are moved up}
//#define AP_CONDITION_ELSE      2
//#define AP_CONDITION_ELSEIF    (AP_CONDITION_ELSE|AP_CONDITION_IF)
//    unsigned int condition_ifelse : 2; //* is this an <If>, <ElseIf>, or <Else> */

    condition: Pap_expr_info_t;   //* Conditionally merge <If> sections */

    //** per-dir log config */
    log: Pap_logconf;

    //** Table of directives allowed per AllowOverrideList */
    override_list: Papr_table_t;

//#define AP_MAXRANGES_UNSET     -1          {fpc -> consts are moved up}
//#define AP_MAXRANGES_DEFAULT   -2
//#define AP_MAXRANGES_UNLIMITED -3
//#define AP_MAXRANGES_NORANGES   0
    //** Number of Ranges before returning HTTP_OK. **/
    max_ranges: Integer;
    //** Max number of Range overlaps (merges) allowed **/
    max_overlaps: Integer;
    //** Max number of Range reversals (eg: 200-300, 100-125) allowed **/
    max_reversals: Integer;

  end; {core_dir_config}

//* macro to implement off by default behaviour */
//#define AP_SENDFILE_ENABLED(x) \
//    ((x) == ENABLE_SENDFILE_ON ? APR_SENDFILE_ENABLED : 0)

//* Per-server core configuration */
const
      //* TRACE control */
  AP_TRACE_UNSET    = -1;
  AP_TRACE_DISABLE  =  0;
  AP_TRACE_ENABLE   =  1;
  AP_TRACE_EXTENDED =  2;

type
  core_server_config = record

    gprof_dir: PChar;

    {* Name translations --- we want the core to be able to do *something*
     * so it's at least a minimally functional web server on its own (and
     * can be tested that way).  But let's keep it to the bare minimum:
     *}
    ap_document_root: PChar;

    //* Access control */

    access_name: PChar;
    sec_dir: Papr_array_header_t;
    sec_url: Papr_array_header_t;

    //* recursion backstopper */
    redirect_limit,          //* maximum number of internal redirects */
    subreq_limit: Integer;   //* maximum nesting level of subrequests */

    protocol: PChar;
    accf_map: Papr_table_t;

    //* array of ap_errorlog_format_item for error log format string */
    error_log_format: Papr_array_header_t;
    {*
     * two arrays of arrays of ap_errorlog_format_item for additional information
     * logged to the error log once per connection/request
     *}
    error_log_conn,
    error_log_req: Papr_array_header_t;

    //* TRACE control */
//#define AP_TRACE_UNSET    -1  {fpc -> consts are moved up}
//#define AP_TRACE_DISABLE   0
//#define AP_TRACE_ENABLE    1
//#define AP_TRACE_EXTENDED  2
    trace_enable: Integer;

  end; {core_server_config}

//* for AddOutputFiltersByType in core.c */
//void ap_add_output_filters_by_type(request_rec *r);

//* for http_config.c */
//void ap_core_reorder_directories(apr_pool_t *, server_rec *);

//* for mod_perl */
//AP_CORE_DECLARE(void) ap_add_per_dir_conf(server_rec *s, void *dir_config);
//AP_CORE_DECLARE(void) ap_add_per_url_conf(server_rec *s, void *url_config);
//AP_CORE_DECLARE(void) ap_add_file_conf(apr_pool_t *p, core_dir_config *conf, void *url_config);
//AP_CORE_DECLARE(const char *) ap_add_if_conf(apr_pool_t *p, core_dir_config *conf, void *url_config);
//AP_CORE_DECLARE_NONSTD(const char *) ap_limit_section(cmd_parms *cmd, void *dummy, const char *arg);

//* Core filters; not exported. */
//apr_status_t ap_core_input_filter(ap_filter_t *f, apr_bucket_brigade *b,
//                                  ap_input_mode_t mode, apr_read_type_e block,
//                                  apr_off_t readbytes);
//apr_status_t ap_core_output_filter(ap_filter_t *f, apr_bucket_brigade *b);


//AP_DECLARE(const char*) ap_get_server_protocol(server_rec* s);
//AP_DECLARE(void) ap_set_server_protocol(server_rec* s, const char* proto);

//typedef struct core_output_filter_ctx core_output_filter_ctx_t;
type
  Pcore_output_filter_ctx_t = ^core_output_filter_ctx_t;
  core_output_filter_ctx_t = record end;

//typedef struct core_filter_ctx        core_ctx_t;
  Pcore_filter_ctx_t = ^core_filter_ctx_t;
  core_filter_ctx_t = record end;
  core_ctx_t = core_filter_ctx_t;
  Pcore_ctx_t = ^core_ctx_t;

  core_net_rec = record
    //** Connection to the client */
    client_socket: Papr_socket_t;

    //** connection record */
    c: Pconn_rec;

    out_ctx: Pcore_output_filter_ctx_t;
    in_ctx: Pcore_ctx_t;
  end; {core_net_rec}

{**
 * Insert the network bucket into the core input filter's input brigade.
 * This hook is intended for MPMs or protocol modules that need to do special
 * socket setup.
 * @param c The connection
 * @param bb The brigade to insert the bucket into
 * @param socket The socket to put into a bucket
 * @return AP_DECLINED if the current function does not handle this connection,
 *         APR_SUCCESS or an error otherwise.
 *}
//AP_DECLARE_HOOK(apr_status_t, insert_network_bucket,
//                (conn_rec *c, apr_bucket_brigade *bb, apr_socket_t *socket))
type
  ap_HOOK_insert_network_bucket_t = function(c: Pconn_rec; bb: Papr_bucket_brigade; socket: Papr_socket_t): apr_status_t; cdecl;

procedure ap_hook_insert_network_bucket(pf: ap_HOOK_insert_network_bucket_t;
                                 const aszPre: PPChar; const aszSucc: PPChar; nOrder: Integer);
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_hook_insert_network_bucket' + LibSuff16;

{* ----------------------------------------------------------------------
 *
 * Runtime status/management
 *}

type
  ap_mgmt_type_e = (
    ap_mgmt_type_string,
    ap_mgmt_type_long,
    ap_mgmt_type_hash
  );

  ap_mgmt_value = record
    case Integer of
     0: (s_value: PChar);
     1: (i_value: cLong);
     2: (h_value: Papr_hash_t);
  end;

  ap_mgmt_item_t = record
    description: PChar;
    name: PChar;
    vtype: ap_mgmt_type_e;
    v: ap_mgmt_value;
  end;

///* Handles for core filters */
//extern AP_DECLARE_DATA ap_filter_rec_t *ap_subreq_core_filter_handle;
//extern AP_DECLARE_DATA ap_filter_rec_t *ap_core_output_filter_handle;
//extern AP_DECLARE_DATA ap_filter_rec_t *ap_content_length_filter_handle;
//extern AP_DECLARE_DATA ap_filter_rec_t *ap_core_input_filter_handle;

{**
 * This hook provdes a way for modules to provide metrics/statistics about
 * their operational status.
 *
 * @param p A pool to use to create entries in the hash table
 * @param val The name of the parameter(s) that is wanted. This is
 *            tree-structured would be in the form ('*' is all the tree,
 *            'module.*' all of the module , 'module.foo.*', or
 *            'module.foo.bar' )
 * @param ht The hash table to store the results. Keys are item names, and
 *           the values point to ap_mgmt_item_t structures.
 * @ingroup hooks
 *}
//AP_DECLARE_HOOK(int, get_mgmt_items,
//                (apr_pool_t *p, const char * val, apr_hash_t *ht))
type
  ap_HOOK_get_mgmt_items_t = function(p: Papr_pool_t; const val: PChar; ht: Papr_hash_t): Integer; cdecl;

procedure ap_hook_get_mgmt_items(pf: ap_HOOK_get_mgmt_items_t;
                                 const aszPre: PPChar; const aszSucc: PPChar; nOrder: Integer);
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_hook_get_mgmt_items' + LibSuff16;

//* ---------------------------------------------------------------------- */

{* ----------------------------------------------------------------------
 *
 * I/O logging with mod_logio
 *}

//APR_DECLARE_OPTIONAL_FN(void, ap_logio_add_bytes_out,
//                        (conn_rec *c, apr_off_t bytes));

//APR_DECLARE_OPTIONAL_FN(void, ap_logio_add_bytes_in,
//                        (conn_rec *c, apr_off_t bytes));

//APR_DECLARE_OPTIONAL_FN(apr_off_t, ap_logio_get_last_bytes, (conn_rec *c));

{* ----------------------------------------------------------------------
 *
 * Error log formats
 *}

{**
 * The info structure passed to callback functions of errorlog handlers.
 * Not all information is available in all contexts. In particular, all
 * pointers may be NULL.
 *}
type
  Pap_errorlog_info = ^ap_errorlog_info;
  ap_errorlog_info = record
    {** current server_rec.
     *  Should be preferred over c->base_server and r->server
     *}
    s: Pserver_rec;

    {** current conn_rec.
     *  Should be preferred over r->connecction
     *}
    c: Pconn_rec;

    //** current request_rec. */
    r :Prequest_rec;
    //** r->main if r is a subrequest, otherwise equal to r */
    rmain :Prequest_rec;

    //** pool passed to ap_log_perror, NULL otherwise */
    pool: Papr_pool_t;

    //** name of source file where the log message was produced, NULL if N/A. */
    file_: PChar;
    //** line number in the source file, 0 if N/A */
    line: Integer;

    //** module index of module that produced the log message, APLOG_NO_MODULE if N/A. */
    module_index: Integer;
    //** log level of error message (flags like APLOG_STARTUP have been removed), -1 if N/A */
    level: Integer;

    //** apr error status related to the log message, 0 if no error */
    status: apr_status_t;

    //** 1 if logging to syslog, 0 otherwise */
    using_syslog: Integer;
    //** 1 if APLOG_STARTUP was set for the log message, 0 otherwise */
    startup: Integer;

    //** message format */
    format: PChar;
  end; {ap_errorlog_info}

{**
 * callback function prototype for a external errorlog handler
 * @note To avoid unbounded memory usage, these functions must not allocate
 * memory from the server, connection, or request pools. If an errorlog
 * handler absolutely needs a pool to pass to other functions, it must create
 * and destroy a sub-pool.
 *}
//typedef int ap_errorlog_handler_fn_t(const ap_errorlog_info *info,
//                                     const char *arg, char *buf, int buflen);
type
ap_errorlog_handler_fn_t = function(const info: Pap_errorlog_info;
                                    const arg: PChar; buf: PChar; buflen: Integer):Integer; cdecl;
{**
 * Register external errorlog handler
 * @param p config pool to use
 * @param tag the new format specifier (i.e. the letter after the %)
 * @param handler the handler function
 * @param flags flags (reserved, set to 0)
 *}
//AP_DECLARE(void) ap_register_errorlog_handler(apr_pool_t *p, char *tag,
//                                              ap_errorlog_handler_fn_t *handler,
//                                              int flags);
procedure ap_register_errorlog_handler(p: Papr_pool_t; tag: PChar;
                                       handler: ap_errorlog_handler_fn_t;
                                       flags: Integer);
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_register_errorlog_handler' + LibSuff16;

type
  ap_errorlog_handler = record
      func: ap_errorlog_handler_fn_t;
      flags: Integer; //* for future extensions */
  end; {ap_errorlog_handler}

const
  //** item starts a new field */
  AP_ERRORLOG_FLAG_FIELD_SEP       = 1;
  //** item is the actual error message */
  AP_ERRORLOG_FLAG_MESSAGE         = 2;
  //** skip whole line if item is zero-length */
  AP_ERRORLOG_FLAG_REQUIRED        = 4;
  //** log zero-length item as '-' */
  AP_ERRORLOG_FLAG_NULL_AS_HYPHEN  = 8;

type
  ap_errorlog_format_item = record
    //** ap_errorlog_handler function */
    func: ap_errorlog_handler_fn_t;
    //** argument passed to item in {} */
    arg: PChar;
    //** a combination of the AP_ERRORLOG_* flags */
    flags: cuint;
    //** only log item if the message's log level is higher than this */
    min_loglevel: cuint;
  end; {ap_errorlog_format_item}

{**
 * hook method to log error messages
 * @ingroup hooks
 * @param info pointer to ap_errorlog_info struct which contains all
 *        the details
 * @param errstr the (unformatted) message to log
 * @warning Allocating from the usual pools (pool, info->c->pool, info->p->pool)
 *          must be avoided because it can cause memory leaks.
 *          Use a subpool if necessary.
 *}
//AP_DECLARE_HOOK(void, error_log, (const ap_errorlog_info *info,
//                                  const char *errstr))

//AP_CORE_DECLARE(void) ap_register_log_hooks(apr_pool_t *p);
//AP_CORE_DECLARE(void) ap_register_config_hooks(apr_pool_t *p);

{* ----------------------------------------------------------------------
 *
 * ident lookups with mod_ident
 *}

//APR_DECLARE_OPTIONAL_FN(const char *, ap_ident_lookup,
//                        (request_rec *r));

{* ----------------------------------------------------------------------
 *
 * authorization values with mod_authz_core
 *}

//APR_DECLARE_OPTIONAL_FN(int, authz_some_auth_required, (request_rec *r));
//APR_DECLARE_OPTIONAL_FN(const char *, authn_ap_auth_type, (request_rec *r));
//APR_DECLARE_OPTIONAL_FN(const char *, authn_ap_auth_name, (request_rec *r));

{* ----------------------------------------------------------------------
 *
 * authorization values with mod_access_compat
 *}

//APR_DECLARE_OPTIONAL_FN(int, access_compat_ap_satisfies, (request_rec *r));

//* ---------------------------------------------------------------------- */

{** Query the server for some state information
 * @param query_code Which information is requested
 * @return the requested state information
 *}
//AP_DECLARE(int) ap_state_query(int query_code);
function ap_state_query(query_code: Integer): Integer;
  {$IFDEF WINDOWS} stdcall; {$ELSE} cdecl; {$ENDIF}
  external LibHTTPD name LibNamePrefix + 'ap_state_query' + LibSuff4;

{*
 * possible values for query_code in ap_state_query()
 *}

const
  //** current status of the server */
  AP_SQ_MAIN_STATE        = 0;
  //** are we going to serve requests or are we just testing/dumping config */
  AP_SQ_RUN_MODE          = 1;
  //** generation of the top-level apache parent */
  AP_SQ_CONFIG_GEN        = 2;

{*
 * return values for ap_state_query()
 *}

  //** return value for unknown query_code */
  AP_SQ_NOT_SUPPORTED        = -1;

//* values returned for AP_SQ_MAIN_STATE */
  //** before the config preflight */
  AP_SQ_MS_INITIAL_STARTUP   = 1;
  //** initial configuration run for setting up log config, etc. */
  AP_SQ_MS_CREATE_PRE_CONFIG = 2;
  //** tearing down configuration */
  AP_SQ_MS_DESTROY_CONFIG    = 3;
  //** normal configuration run */
  AP_SQ_MS_CREATE_CONFIG     = 4;
  //** running the MPM */
  AP_SQ_MS_RUN_MPM           = 5;
  //** cleaning up for exit */
  AP_SQ_MS_EXITING           = 6;

//* values returned for AP_SQ_RUN_MODE */
  //** command line not yet parsed */
  AP_SQ_RM_UNKNOWN           = 1;
  //** normal operation (server requests or signal server) */
  AP_SQ_RM_NORMAL            = 2;
  //** config test only */
  AP_SQ_RM_CONFIG_TEST       = 3;
  //** only dump some parts of the config */
  AP_SQ_RM_CONFIG_DUMP       = 4;

//#endif  /* !APACHE_HTTP_CORE_H */
(** @} *)