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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1990-2001 by Sun Microsystems, Inc.
* All rights reserved.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <stdlib.h>
#include <unistd.h>
#include <AudioPipe.h>
// class AudioPipe methods
// Constructor with file descriptor, mode, and optional name
AudioPipe::
AudioPipe(
const int desc, // file descriptor
const FileAccess acc, // access mode
const char *name_local): // name
AudioUnixfile(name_local, acc)
{
setfd(desc);
}
// The create routine for pipes writes a file header
AudioError AudioPipe::
Create()
{
AudioError err;
// Was the header properly set?
err = GetHeader().Validate();
if (err != AUDIO_SUCCESS)
return (RaiseError(err));
// Open fd supplied by constructor
if (!isfdset())
return (RaiseError(AUDIO_ERR_NOEFFECT));
// Write the file header with current (usually unknown) size
err = encode_filehdr();
if (err != AUDIO_SUCCESS) {
(void) close(getfd()); // If error, remove file
setfd(-1);
return (err);
}
// Set the actual output length to zero
setlength(0.);
return (AUDIO_SUCCESS);
}
// The open routine for pipes decodes the header
AudioError AudioPipe::
Open()
{
AudioError err;
// The constructor should have supplied a valid fd
if (!isfdset())
return (RaiseError(AUDIO_ERR_NOEFFECT));
// Decode a file header
err = decode_filehdr();
if (err != AUDIO_SUCCESS) {
(void) close(getfd());
setfd(-1);
return (err);
}
return (AUDIO_SUCCESS);
}
// Read data from underlying pipe into specified buffer.
// No data format translation takes place.
// Since there's no going back, the object's read position pointer is updated.
AudioError AudioPipe::
ReadData(
void* buf, // destination buffer address
size_t& len, // buffer length (updated)
Double& pos) // start position (updated)
{
AudioError err;
char *tbuf; // current buffer pointer
size_t remain; // number of bytes remaining
size_t cnt; // accumulated number of bytes read
tbuf = (char *)buf;
remain = len;
cnt = 0;
// Pipes return short reads. If non-blocking i/o, try to read all.
do {
// Call the real routine
err = AudioUnixfile::ReadData((void*)tbuf, remain, pos);
// Update the object's read position
if (!err) {
(void) SetReadPosition(pos, Absolute);
if (remain == 0)
break;
cnt += remain;
tbuf += remain;
remain = len - cnt;
}
} while (!err && (remain > 0) && GetBlocking());
len = cnt;
if (len > 0)
return (AUDIO_SUCCESS);
return (err);
}
// Write data to underlying file from specified buffer.
// No data format translation takes place.
// Since there's no going back, the object's write position pointer is updated.
AudioError AudioPipe::
WriteData(
void* buf, // source buffer address
size_t& len, // buffer length (updated)
Double& pos) // start position (updated)
{
AudioError err;
// Call the real routine
err = AudioUnixfile::WriteData(buf, len, pos);
// Update the object's write position
if (err == AUDIO_SUCCESS)
(void) SetWritePosition(pos, Absolute);
return (err);
}
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