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be2516a091
Removed some obsolete patches that were either backports from newer svn revisions, or a fix for older, non-applicable assemblers. Update our own README to account for upstream's migration to git. I didn't remove the bug 703135 patch as it's for MSVC it seems, and we still use MSVC for Windows. Also deleted some unneeded upstream code deleted by Mozilla as well.
114 lines
3.1 KiB
C
114 lines
3.1 KiB
C
/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE OggTheora SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
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* by the Xiph.Org Foundation and contributors http://www.xiph.org/ *
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* *
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********************************************************************
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function: packing variable sized words into an octet stream
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last mod: $Id$
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********************************************************************/
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#include <string.h>
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#include <stdlib.h>
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#include "bitpack.h"
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/*We're 'MSb' endian; if we write a word but read individual bits,
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then we'll read the MSb first.*/
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void oc_pack_readinit(oc_pack_buf *_b,unsigned char *_buf,long _bytes){
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memset(_b,0,sizeof(*_b));
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_b->ptr=_buf;
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_b->stop=_buf+_bytes;
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}
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static oc_pb_window oc_pack_refill(oc_pack_buf *_b,int _bits){
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const unsigned char *ptr;
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const unsigned char *stop;
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oc_pb_window window;
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int available;
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unsigned shift;
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stop=_b->stop;
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ptr=_b->ptr;
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window=_b->window;
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available=_b->bits;
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shift=OC_PB_WINDOW_SIZE-available;
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while(7<shift&&ptr<stop){
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shift-=8;
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window|=(oc_pb_window)*ptr++<<shift;
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}
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_b->ptr=ptr;
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available=OC_PB_WINDOW_SIZE-shift;
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if(_bits>available){
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if(ptr>=stop){
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_b->eof=1;
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available=OC_LOTS_OF_BITS;
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}
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else window|=*ptr>>(available&7);
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}
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_b->bits=available;
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return window;
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}
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int oc_pack_look1(oc_pack_buf *_b){
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oc_pb_window window;
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int available;
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window=_b->window;
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available=_b->bits;
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if(available<1)_b->window=window=oc_pack_refill(_b,1);
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return window>>OC_PB_WINDOW_SIZE-1;
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}
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void oc_pack_adv1(oc_pack_buf *_b){
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_b->window<<=1;
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_b->bits--;
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}
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/*Here we assume that 0<=_bits&&_bits<=32.*/
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long oc_pack_read_c(oc_pack_buf *_b,int _bits){
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oc_pb_window window;
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int available;
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long result;
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window=_b->window;
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available=_b->bits;
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if(_bits==0)return 0;
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if(available<_bits){
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window=oc_pack_refill(_b,_bits);
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available=_b->bits;
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}
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result=window>>OC_PB_WINDOW_SIZE-_bits;
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available-=_bits;
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window<<=1;
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window<<=_bits-1;
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_b->window=window;
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_b->bits=available;
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return result;
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}
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int oc_pack_read1_c(oc_pack_buf *_b){
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oc_pb_window window;
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int available;
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int result;
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window=_b->window;
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available=_b->bits;
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if(available<1){
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window=oc_pack_refill(_b,1);
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available=_b->bits;
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}
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result=window>>OC_PB_WINDOW_SIZE-1;
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available--;
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window<<=1;
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_b->window=window;
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_b->bits=available;
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return result;
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}
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long oc_pack_bytes_left(oc_pack_buf *_b){
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if(_b->eof)return -1;
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return _b->stop-_b->ptr+(_b->bits>>3);
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}
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