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tag/Id3Load: simplify end offset calculation

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This commit is contained in:
Max Kellermann 2016-02-22 12:37:33 +01:00
parent a224722ae2
commit 57da5c0841
1 changed files with 6 additions and 2 deletions
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8
src/tag/Id3Load.cxx
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@ -138,11 +138,15 @@ tag_id3_find_from_beginning(FILE *stream)
static UniqueId3Tag
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, -(off_t)ID3V1_SIZE, SEEK_END);
auto v1tag = tag_id3_read(stream, offset, SEEK_END);
if (!v1tag)
offset = 0;
/* Get the id3v2 tag size from the footer (located before v1tag) */
int tagsize = get_id3v2_footer_size(stream, (v1tag ? -(off_t)ID3V1_SIZE : 0) - ID3_TAG_QUERYSIZE, SEEK_END);
int tagsize = get_id3v2_footer_size(stream, offset - ID3_TAG_QUERYSIZE, SEEK_END);
if (tagsize >= 0)
return v1tag;