98 lines
2.3 KiB
C++
98 lines
2.3 KiB
C++
/*
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* Copyright (C) 2003-2014 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h" /* must be first for large file support */
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#include "Riff.hxx"
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#include "util/Domain.hxx"
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#include "system/ByteOrder.hxx"
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#include "Log.hxx"
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#include <limits>
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#include <stdint.h>
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#include <sys/stat.h>
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#include <string.h>
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static constexpr Domain riff_domain("riff");
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struct riff_header {
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char id[4];
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uint32_t size;
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char format[4];
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};
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struct riff_chunk_header {
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char id[4];
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uint32_t size;
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};
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size_t
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riff_seek_id3(FILE *file)
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{
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/* determine the file size */
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struct stat st;
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if (fstat(fileno(file), &st) < 0) {
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LogErrno(riff_domain, "Failed to stat file descriptor");
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return 0;
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}
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/* seek to the beginning and read the RIFF header */
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if (fseek(file, 0, SEEK_SET) != 0) {
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LogErrno(riff_domain, "Failed to seek");
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return 0;
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}
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riff_header header;
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size_t size = fread(&header, sizeof(header), 1, file);
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if (size != 1 ||
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memcmp(header.id, "RIFF", 4) != 0 ||
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FromLE32(header.size) > (uint32_t)st.st_size)
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/* not a RIFF file */
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return 0;
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while (true) {
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/* read the chunk header */
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riff_chunk_header chunk;
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size = fread(&chunk, sizeof(chunk), 1, file);
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if (size != 1)
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return 0;
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size = FromLE32(chunk.size);
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if (size > size_t(std::numeric_limits<int>::max()))
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/* too dangerous, bail out: possible integer
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underflow when casting to off_t */
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return 0;
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if (size % 2 != 0)
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/* pad byte */
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++size;
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if (memcmp(chunk.id, "id3 ", 4) == 0 ||
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memcmp(chunk.id, "ID3 ", 4) == 0)
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/* found it! */
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return size;
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if (fseek(file, size, SEEK_CUR) != 0)
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return 0;
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}
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}
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