mpd/src/tag/Aiff.cxx
2021-01-01 19:54:28 +01:00

79 lines
2.0 KiB
C++

/*
* 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 "Aiff.hxx"
#include "input/InputStream.hxx"
#include "util/ByteOrder.hxx"
#include <cstdint>
#include <limits>
#include <stdexcept>
#include <string.h>
struct aiff_header {
char id[4];
uint32_t size;
char format[4];
};
struct aiff_chunk_header {
char id[4];
uint32_t size;
};
size_t
aiff_seek_id3(InputStream &is, std::unique_lock<Mutex> &lock)
{
/* seek to the beginning and read the AIFF header */
is.Rewind(lock);
aiff_header header;
is.ReadFull(lock, &header, sizeof(header));
if (memcmp(header.id, "FORM", 4) != 0 ||
(is.KnownSize() && FromBE32(header.size) > is.GetSize()) ||
(memcmp(header.format, "AIFF", 4) != 0 &&
memcmp(header.format, "AIFC", 4) != 0))
throw std::runtime_error("Not an AIFF file");
while (true) {
/* read the chunk header */
aiff_chunk_header chunk;
is.ReadFull(lock, &chunk, sizeof(chunk));
size_t size = FromBE32(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("AIFF chunk is too large");
if (memcmp(chunk.id, "ID3 ", 4) == 0)
/* found it! */
return size;
if (size % 2 != 0)
/* pad byte */
++size;
is.Skip(lock, size);
}
}