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Improve MUSX padding detector performance

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This commit is contained in:
bnnm 2019-12-05 23:17:40 +01:00
parent bccce006f6
commit 30ee4129d1
1 changed files with 17 additions and 9 deletions
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26
src/meta/musx.c
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@ -300,18 +300,26 @@ static int parse_musx_stream(STREAMFILE *streamFile, musx_header *musx) {
musx->loop_flag = (musx->loop_start_sample >= 0);
}
/* fix some v10 sizes */
/* fix some v10 platform (like PSP) sizes */
if (musx->stream_size == 0) {
off_t offset;
musx->stream_size = musx->file_size - musx->stream_offset;
/* remove padding */
offset = musx->stream_offset + musx->stream_size - 0x04;
while (offset > 0) {
if (read_32bit(offset, streamFile) != 0xABABABAB)
break;
musx->stream_size -= 0x04;
offset -= 0x04;
/* always padded to nearest 0x800 sector */
if (musx->stream_size > 0x800) {
uint8_t buf[0x800];
int pos;
off_t offset = musx->stream_offset + musx->stream_size - 0x800;
if (read_streamfile(buf, offset, sizeof(buf), streamFile) != 0x800)
goto fail;
pos = 0x800 - 0x04;
while (pos > 0) {
if (get_u32be(buf + pos) != 0xABABABAB)
break;
musx->stream_size -= 0x04;
pos -= 0x04;
}
}
}