diff options
Diffstat (limited to 'thirdparty/libtheora/bitpack.c')
| -rw-r--r-- | thirdparty/libtheora/bitpack.c | 23 |
1 files changed, 13 insertions, 10 deletions
diff --git a/thirdparty/libtheora/bitpack.c b/thirdparty/libtheora/bitpack.c index 8195003bad..5125dde6b0 100644 --- a/thirdparty/libtheora/bitpack.c +++ b/thirdparty/libtheora/bitpack.c @@ -11,7 +11,7 @@ ******************************************************************** function: packing variable sized words into an octet stream - last mod: $Id: bitpack.c 16503 2009-08-22 18:14:02Z giles $ + last mod: $Id$ ********************************************************************/ #include <string.h> @@ -32,15 +32,18 @@ static oc_pb_window oc_pack_refill(oc_pack_buf *_b,int _bits){ const unsigned char *stop; oc_pb_window window; int available; + unsigned shift; + stop=_b->stop; + ptr=_b->ptr; window=_b->window; available=_b->bits; - ptr=_b->ptr; - stop=_b->stop; - while(available<=OC_PB_WINDOW_SIZE-8&&ptr<stop){ - available+=8; - window|=(oc_pb_window)*ptr++<<OC_PB_WINDOW_SIZE-available; + shift=OC_PB_WINDOW_SIZE-available; + while(7<shift&&ptr<stop){ + shift-=8; + window|=(oc_pb_window)*ptr++<<shift; } _b->ptr=ptr; + available=OC_PB_WINDOW_SIZE-shift; if(_bits>available){ if(ptr>=stop){ _b->eof=1; @@ -67,7 +70,7 @@ void oc_pack_adv1(oc_pack_buf *_b){ } /*Here we assume that 0<=_bits&&_bits<=32.*/ -long oc_pack_read(oc_pack_buf *_b,int _bits){ +long oc_pack_read_c(oc_pack_buf *_b,int _bits){ oc_pb_window window; int available; long result; @@ -82,12 +85,12 @@ long oc_pack_read(oc_pack_buf *_b,int _bits){ available-=_bits; window<<=1; window<<=_bits-1; - _b->bits=available; _b->window=window; + _b->bits=available; return result; } -int oc_pack_read1(oc_pack_buf *_b){ +int oc_pack_read1_c(oc_pack_buf *_b){ oc_pb_window window; int available; int result; @@ -100,8 +103,8 @@ int oc_pack_read1(oc_pack_buf *_b){ result=window>>OC_PB_WINDOW_SIZE-1; available--; window<<=1; - _b->bits=available; _b->window=window; + _b->bits=available; return result; } |