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tag/Id3Load: optimized ID3v1 loader

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Use a 128 byte buffer instead of reading 10 bytes first and then 118.
This commit is contained in:
Max Kellermann 2016-02-22 12:33:16 +01:00
parent 57da5c0841
commit c682d087d9
1 changed files with 15 additions and 1 deletions
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16
src/tag/Id3Load.cxx
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@ -95,6 +95,17 @@ ReadId3Tag(FILE *file)
return UniqueId3Tag(id3_tag_parse(tag_buffer.get(), tag_size));
}
static UniqueId3Tag
ReadId3v1Tag(FILE *file)
{
id3_byte_t buffer[ID3V1_SIZE];
if (fread(buffer, 1, ID3V1_SIZE, file) != ID3V1_SIZE)
return nullptr;
return UniqueId3Tag(id3_tag_parse(buffer, ID3V1_SIZE));
}
static UniqueId3Tag
tag_id3_read(FILE *file, long offset, int whence)
{
@ -141,7 +152,10 @@ tag_id3_find_from_end(FILE *stream)
off_t offset = -(off_t)ID3V1_SIZE;
/* Get an id3v1 tag from the end of file for later use */
auto v1tag = tag_id3_read(stream, offset, SEEK_END);
if (fseek(stream, offset, SEEK_END) != 0)
return nullptr;
auto v1tag = ReadId3v1Tag(stream);
if (!v1tag)
offset = 0;