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bitstream reading was majorly broken for edge cases (of which there are a lot in a MUS playlist!)

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git-svn-id: https://vgmstream.svn.sourceforge.net/svnroot/vgmstream@368 51a99a44-fe44-0410-b1ba-c3e57ba2b86b
This commit is contained in:
halleyscometsw 2008-07-22 04:47:37 +00:00
parent 6a0fd32833
commit 3a47ef576b
1 changed files with 14 additions and 8 deletions
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22
src/coding/acm_decoder.c
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@ -51,31 +51,37 @@ static int get_bits_reload(ACMStream *acm, unsigned bits)
switch (acm->data_len - acm->buf_start_ofs) {
case 0:
return ACM_ERR_UNEXPECTED_EOF;
b_data = 0;
b_avail = 8;
break;
case 1:
b_data = read_8bit(acm->buf_start_ofs,acm->streamfile);
b_data = (uint8_t)read_8bit(acm->buf_start_ofs,acm->streamfile);
b_avail = 8;
acm->buf_start_ofs += 1;
break;
case 2:
b_data = read_16bitLE(acm->buf_start_ofs,acm->streamfile);
b_data = (uint16_t)read_16bitLE(acm->buf_start_ofs,acm->streamfile);
b_avail = 16;
acm->buf_start_ofs += 2;
break;
case 3:
b_data = read_8bit(acm->buf_start_ofs,acm->streamfile);
b_data |= (int32_t)read_16bitLE(acm->buf_start_ofs+1,acm->streamfile)<<8;
b_data = (uint8_t)read_8bit(acm->buf_start_ofs,acm->streamfile);
b_data |= (int32_t)(uint16_t)read_16bitLE(acm->buf_start_ofs+1,acm->streamfile)<<8;
b_avail = 24;
acm->buf_start_ofs += 3;
break;
case 4:
default:
/* shouldn't happen */
if (acm->data_len - acm->buf_start_ofs < 0)
return ACM_ERR_UNEXPECTED_EOF;
if (acm->data_len - acm->buf_start_ofs <= 0) {
b_data = 0;
b_avail = 8;
break;
}
b_data = read_32bitLE(acm->buf_start_ofs,acm->streamfile);
b_avail = 32;
acm->buf_start_ofs += 4;
break;
}
data |= (b_data & ((1 << bits) - 1)) << got;