mpd/src/riff.c
Max Kellermann 9d1a34e30b added missing config.h includes for extended LFS support
All sources which might work with large files must include config.h,
to get Large File Support on 32 bit platforms.
2009-11-11 14:15:34 +01:00

105 lines
2.3 KiB
C

/*
* Copyright (C) 2003-2009 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" /* must be first for large file support */
#include "riff.h"
#include <glib.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "riff"
struct riff_header {
char id[4];
uint32_t size;
char format[4];
};
struct riff_chunk_header {
char id[4];
uint32_t size;
};
size_t
riff_seek_id3(FILE *file)
{
int ret;
struct stat st;
struct riff_header header;
struct riff_chunk_header chunk;
size_t size;
/* determine the file size */
ret = fstat(fileno(file), &st);
if (ret < 0) {
g_warning("Failed to stat file descriptor: %s",
strerror(errno));
return 0;
}
/* seek to the beginning and read the RIFF header */
ret = fseek(file, 0, SEEK_SET);
if (ret != 0) {
g_warning("Failed to seek: %s", g_strerror(errno));
return 0;
}
size = fread(&header, sizeof(header), 1, file);
if (size != 1 ||
memcmp(header.id, "RIFF", 4) != 0 ||
GUINT32_FROM_LE(header.size) > (uint32_t)st.st_size)
/* not a RIFF file */
return 0;
while (true) {
/* read the chunk header */
size = fread(&chunk, sizeof(chunk), 1, file);
if (size != 1)
return 0;
size = GUINT32_FROM_LE(chunk.size);
if (size > G_MAXINT32)
/* too dangerous, bail out: possible integer
underflow when casting to off_t */
return 0;
if (size % 2 != 0)
/* pad byte */
++size;
if (memcmp(chunk.id, "id3 ", 4) == 0)
/* found it! */
return size;
ret = fseek(file, size, SEEK_CUR);
if (ret != 0)
return 0;
}
}