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/*
* Copyright 2003-2021 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 "RiffId3.hxx"
#include "RiffFormat.hxx"
#include "input/InputStream.hxx"
#include "util/ByteOrder.hxx"
#include <limits>
#include <stdexcept>
#include <string.h>
size_t
riff_seek_id3(InputStream &is, std::unique_lock<Mutex> &lock)
{
/* seek to the beginning and read the RIFF header */
is.Rewind(lock);
riff_header header;
is.ReadFull(lock, &header, sizeof(header));
if (memcmp(header.id, "RIFF", 4) != 0 ||
(is.KnownSize() && FromLE32(header.size) > is.GetSize()))
throw std::runtime_error("Not a RIFF file");
while (true) {
/* read the chunk header */
riff_chunk_header chunk;
is.ReadFull(lock, &chunk, sizeof(chunk));
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 */
throw std::runtime_error("RIFF chunk is too large");
if (memcmp(chunk.id, "id3 ", 4) == 0 ||
memcmp(chunk.id, "ID3 ", 4) == 0)
/* found it! */
return size;
if (size % 2 != 0)
/* pad byte */
++size;
is.Skip(lock, size);
}
}
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