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Fix bug in bitreader handling of read callback returning a short count (SF#2490454: https://sourceforge.net/tracker2/?func=detail&aid=2490454&group_id=13478&atid=113478)

This commit is contained in:
Josh Coalson 2009-01-06 17:14:31 +00:00
parent 0915a551eb
commit ee51fc0bae
3 changed files with 12 additions and 10 deletions
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1
doc/html/changelog.html
View File

@ -120,6 +120,7 @@
libraries:
<ul>
<li>libFLAC encoder was defaulting to level 0 compression instead of 5 (<a href="https://sourceforge.net/tracker2/?func=detail&aid=1816825&group_id=13478&atid=113478">SF #1816825</a>).</li>
<li>Fix bug in bitreader handling of read callback returning a short count (<a href="https://sourceforge.net/tracker2/?func=detail&aid=2490454&group_id=13478&atid=113478">SF #2490454</a>).</li>
</ul>
</li>
<li>

12
src/libFLAC/bitreader.c
View File

@ -758,7 +758,7 @@ FLAC__bool FLAC__bitreader_read_unary_unsigned(FLAC__BitReader *br, unsigned *va
* us data a byte at a time (unlikely), br->consumed_bits may not
* be zero.
*/
if(br->bytes) {
if(br->bytes*8 > br->consumed_bits) {
const unsigned end = br->bytes * 8;
brword b = (br->buffer[br->consumed_words] & (FLAC__WORD_ALL_ONES << (FLAC__BITS_PER_WORD-end))) << br->consumed_bits;
if(b) {
@ -771,7 +771,7 @@ FLAC__bool FLAC__bitreader_read_unary_unsigned(FLAC__BitReader *br, unsigned *va
}
else {
*val += end - br->consumed_bits;
br->consumed_bits += end;
br->consumed_bits = end;
FLAC__ASSERT(br->consumed_bits < FLAC__BITS_PER_WORD);
/* didn't find stop bit yet, have to keep going... */
}
@ -881,7 +881,7 @@ FLAC__bool FLAC__bitreader_read_rice_signed_block(FLAC__BitReader *br, int vals[
* us data a byte at a time (unlikely), br->consumed_bits may not
* be zero.
*/
if(br->bytes) {
if(br->bytes*8 > cbits) {
const unsigned end = br->bytes * 8;
brword b = (br->buffer[cwords] & (FLAC__WORD_ALL_ONES << (FLAC__BITS_PER_WORD-end))) << cbits;
if(b) {
@ -895,7 +895,7 @@ FLAC__bool FLAC__bitreader_read_rice_signed_block(FLAC__BitReader *br, int vals[
}
else {
uval += end - cbits;
cbits += end;
cbits = end;
FLAC__ASSERT(cbits < FLAC__BITS_PER_WORD);
/* didn't find stop bit yet, have to keep going... */
}
@ -1064,7 +1064,7 @@ break2:
* us data a byte at a time (unlikely), br->consumed_bits may not
* be zero.
*/
if(br->bytes) {
if(br->bytes*8 > cbits) {
const unsigned end = br->bytes * 8;
brword b = (br->buffer[cwords] & ~(FLAC__WORD_ALL_ONES >> end)) << cbits;
if(b) {
@ -1077,7 +1077,7 @@ break2:
}
else {
uval += end - cbits;
cbits += end;
cbits = end;
FLAC__ASSERT(cbits < FLAC__BITS_PER_WORD);
/* didn't find stop bit yet, have to keep going... */
}

9
src/libFLAC/ia32/bitreader_asm.nasm
View File

@ -272,10 +272,11 @@ cident FLAC__bitreader_read_rice_signed_block_asm_ia32_bswap
;; edi uval
;; ebp br
mov edx, [ebp + 12] ; edx <- br->bytes
test edx, edx
jz .read1 ; if(br->bytes) { [NOTE: this case is rare so it doesn't have to be all that fast ]
shl edx, 3 ; edx <- br->bytes*8
cmp edx, ecx
jbe .read1 ; if(br->bytes*8 > cbits) { [NOTE: this case is rare so it doesn't have to be all that fast ]
mov ebx, [ebp]
shl edx, 3 ; edx <- const unsigned end = br->bytes * 8;
; edx <- const unsigned end = br->bytes * 8;
mov eax, [ebx + 4*esi] ; b = br->buffer[cwords]
xchg edx, ecx ; [edx <- cbits , ecx <- end]
mov ebx, 0xffffffff ; ebx <- FLAC__WORD_ALL_ONES
@ -296,7 +297,7 @@ cident FLAC__bitreader_read_rice_signed_block_asm_ia32_bswap
.c1_next3: ; } else {
sub edi, ecx
add edi, edx ; uval += end - cbits;
add ecx, edx ; cbits += end
mov ecx, edx ; cbits = end
; /* didn't find stop bit yet, have to keep going... */
; }
; }