103 lines
2.2 KiB
C
103 lines
2.2 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#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 % 2 != 0)
|
|
/* pad byte */
|
|
++size;
|
|
|
|
if (memcmp(chunk.id, "id3 ", 4) == 0)
|
|
/* found it! */
|
|
return size;
|
|
|
|
if ((off_t)size < 0)
|
|
/* integer underflow after cast to signed
|
|
type */
|
|
return 0;
|
|
|
|
ret = fseek(file, size, SEEK_CUR);
|
|
if (ret != 0)
|
|
return 0;
|
|
}
|
|
}
|