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/*
* Copyright (C) 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"
#include "Id3Load.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include "Log.hxx"
#include "Riff.hxx"
#include "Aiff.hxx"
#include "fs/Path.hxx"
#include "fs/NarrowPath.hxx"
#include "fs/FileSystem.hxx"
#include <id3tag.h>
#include <algorithm>
#include <stdio.h>
static constexpr Domain id3_domain("id3");
gcc_pure
static inline bool
tag_is_id3v1(struct id3_tag *tag)
{
return (id3_tag_options(tag, 0, 0) & ID3_TAG_OPTION_ID3V1) != 0;
}
static size_t
fill_buffer(void *buf, size_t size, FILE *stream, long offset, int whence)
{
if (fseek(stream, offset, whence) != 0) return 0;
return fread(buf, 1, size, stream);
}
static long
get_id3v2_footer_size(FILE *stream, long offset, int whence)
{
id3_byte_t buf[ID3_TAG_QUERYSIZE];
size_t bufsize = fill_buffer(buf, ID3_TAG_QUERYSIZE, stream, offset, whence);
if (bufsize == 0) return 0;
return id3_tag_query(buf, bufsize);
}
static UniqueId3Tag
ReadId3Tag(FILE *file)
{
id3_byte_t query_buffer[ID3_TAG_QUERYSIZE];
size_t query_buffer_size = fread(query_buffer, 1, sizeof(query_buffer),
file);
if (query_buffer_size == 0)
return nullptr;
/* Look for a tag header */
long tag_size = id3_tag_query(query_buffer, query_buffer_size);
if (tag_size <= 0) return nullptr;
/* Found a tag. Allocate a buffer and read it in. */
if (size_t(tag_size) <= query_buffer_size)
/* we have enough data already */
return UniqueId3Tag(id3_tag_parse(query_buffer, tag_size));
std::unique_ptr<id3_byte_t[]> tag_buffer(new id3_byte_t[tag_size]);
/* copy the start of the tag we already have to the allocated
buffer */
id3_byte_t *end = std::copy_n(query_buffer, query_buffer_size,
tag_buffer.get());
/* now read the remaining bytes */
const size_t remaining = tag_size - query_buffer_size;
const size_t nbytes = fread(end, 1, remaining, file);
if (nbytes != remaining)
return nullptr;
return UniqueId3Tag(id3_tag_parse(tag_buffer.get(), tag_size));
}
static UniqueId3Tag
tag_id3_read(FILE *file, long offset, int whence)
{
if (fseek(file, offset, whence) != 0)
return 0;
return ReadId3Tag(file);
}
static UniqueId3Tag
tag_id3_find_from_beginning(FILE *stream)
{
auto tag = ReadId3Tag(stream);
if (!tag) {
return nullptr;
} else if (tag_is_id3v1(tag.get())) {
/* id3v1 tags don't belong here */
return nullptr;
}
/* We have an id3v2 tag, so let's look for SEEK frames */
id3_frame *frame;
while ((frame = id3_tag_findframe(tag.get(), "SEEK", 0))) {
/* Found a SEEK frame, get it's value */
int seek = id3_field_getint(id3_frame_field(frame, 0));
if (seek < 0)
break;
/* Get the tag specified by the SEEK frame */
auto seektag = tag_id3_read(stream, seek, SEEK_CUR);
if (!seektag || tag_is_id3v1(seektag.get()))
break;
/* Replace the old tag with the new one */
tag = std::move(seektag);
}
return tag;
}
static UniqueId3Tag
tag_id3_find_from_end(FILE *stream)
{
/* Get an id3v1 tag from the end of file for later use */
auto v1tag = tag_id3_read(stream, -128, SEEK_END);
/* Get the id3v2 tag size from the footer (located before v1tag) */
int tagsize = get_id3v2_footer_size(stream, (v1tag ? -128 : 0) - ID3_TAG_QUERYSIZE, SEEK_END);
if (tagsize >= 0)
return v1tag;
/* Get the tag which the footer belongs to */
auto tag = tag_id3_read(stream, tagsize, SEEK_CUR);
if (!tag)
return v1tag;
/* We have an id3v2 tag, so ditch v1tag */
return tag;
}
static UniqueId3Tag
tag_id3_riff_aiff_load(FILE *file)
{
size_t size = riff_seek_id3(file);
if (size == 0)
size = aiff_seek_id3(file);
if (size == 0)
return nullptr;
if (size > 4 * 1024 * 1024)
/* too large, don't allocate so much memory */
return nullptr;
std::unique_ptr<id3_byte_t[]> buffer(new id3_byte_t[size]);
size_t ret = fread(buffer.get(), size, 1, file);
if (ret != 1) {
LogWarning(id3_domain, "Failed to read RIFF chunk");
return nullptr;
}
return UniqueId3Tag(id3_tag_parse(buffer.get(), size));
}
UniqueId3Tag
tag_id3_load(Path path_fs, Error &error)
{
FILE *file = FOpen(path_fs, PATH_LITERAL("rb"));
if (file == nullptr) {
error.FormatErrno("Failed to open file %s",
NarrowPath(path_fs).c_str());
return nullptr;
}
auto tag = tag_id3_find_from_beginning(file);
if (tag == nullptr) {
tag = tag_id3_riff_aiff_load(file);
if (tag == nullptr)
tag = tag_id3_find_from_end(file);
}
fclose(file);
return tag;
}
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