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/*
* Copyright 2003-2016 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.hxx"
#include "input/InputStream.hxx"
#include "system/ByteOrder.hxx"
#include "Log.hxx"
#include "util/Error.hxx"
#include <limits>
#include <stdint.h>
#include <string.h>
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(InputStream &is)
{
/* seek to the beginning and read the RIFF header */
Error error;
if (!is.Rewind(error)) {
LogError(error, "Failed to seek");
return 0;
}
riff_header header;
if (!is.ReadFull(&header, sizeof(header), IgnoreError()) ||
memcmp(header.id, "RIFF", 4) != 0 ||
(is.KnownSize() && FromLE32(header.size) > is.GetSize()))
/* not a RIFF file */
return 0;
while (true) {
/* read the chunk header */
riff_chunk_header chunk;
if (!is.ReadFull(&chunk, sizeof(chunk), IgnoreError()))
return 0;
size_t size = FromLE32(chunk.size);
if (size > size_t(std::numeric_limits<int>::max()))
/* too dangerous, bail out: possible integer
underflow when casting to off_t */
return 0;
if (memcmp(chunk.id, "id3 ", 4) == 0 ||
memcmp(chunk.id, "ID3 ", 4) == 0)
/* found it! */
return size;
if (size % 2 != 0)
/* pad byte */
++size;
if (!is.Skip(size, IgnoreError()))
return 0;
}
}
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