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/*
* Copyright (C) 2003-2012 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "FLACIOHandle.hxx"
#include "io_error.h"
#include "gcc.h"
#include <errno.h>
static size_t
FLACIORead(void *ptr, size_t size, size_t nmemb, FLAC__IOHandle handle)
{
input_stream *is = (input_stream *)handle;
uint8_t *const p0 = (uint8_t *)ptr, *p = p0,
*const end = p0 + size * nmemb;
/* libFLAC is very picky about short reads, and expects the IO
callback to fill the whole buffer (undocumented!) */
GError *error = nullptr;
while (p < end) {
size_t nbytes = input_stream_lock_read(is, p, end - p, &error);
if (nbytes == 0) {
if (error == nullptr)
/* end of file */
break;
if (error->domain == errno_quark())
errno = error->code;
else
/* just some random non-zero
errno value */
errno = EINVAL;
g_error_free(error);
return 0;
}
p += nbytes;
}
/* libFLAC expects a clean errno after returning from the IO
callbacks (undocumented!) */
errno = 0;
return (p - p0) / size;
}
static int
FLACIOSeek(FLAC__IOHandle handle, FLAC__int64 offset, int whence)
{
input_stream *is = (input_stream *)handle;
return input_stream_lock_seek(is, offset, whence, nullptr) ? 0 : -1;
}
static FLAC__int64
FLACIOTell(FLAC__IOHandle handle)
{
input_stream *is = (input_stream *)handle;
return is->offset;
}
static int
FLACIOEof(FLAC__IOHandle handle)
{
input_stream *is = (input_stream *)handle;
return input_stream_lock_eof(is);
}
static int
FLACIOClose(gcc_unused FLAC__IOHandle handle)
{
/* no-op because the libFLAC caller is repsonsible for closing
the #input_stream */
return 0;
}
const FLAC__IOCallbacks flac_io_callbacks = {
FLACIORead,
nullptr,
nullptr,
nullptr,
FLACIOEof,
FLACIOClose,
};
const FLAC__IOCallbacks flac_io_callbacks_seekable = {
FLACIORead,
nullptr,
FLACIOSeek,
FLACIOTell,
FLACIOEof,
FLACIOClose,
};
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