--- a/misc/libtremor/tremor/bitwise.c Tue Jul 16 11:14:27 2013 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,265 +0,0 @@
-/********************************************************************
- * *
- * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
- * *
- * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
- * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
- * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
- * *
- * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
- * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
- * *
- ********************************************************************
-
- function: packing variable sized words into an octet stream
-
- ********************************************************************/
-
-/* We're 'LSb' endian; if we write a word but read individual bits,
- then we'll read the lsb first */
-
-#include <string.h>
-#include <stdlib.h>
-#include "ogg.h"
-
-static unsigned long mask[]=
-{0x00000000,0x00000001,0x00000003,0x00000007,0x0000000f,
- 0x0000001f,0x0000003f,0x0000007f,0x000000ff,0x000001ff,
- 0x000003ff,0x000007ff,0x00000fff,0x00001fff,0x00003fff,
- 0x00007fff,0x0000ffff,0x0001ffff,0x0003ffff,0x0007ffff,
- 0x000fffff,0x001fffff,0x003fffff,0x007fffff,0x00ffffff,
- 0x01ffffff,0x03ffffff,0x07ffffff,0x0fffffff,0x1fffffff,
- 0x3fffffff,0x7fffffff,0xffffffff };
-
-/* mark read process as having run off the end */
-static void _adv_halt(oggpack_buffer *b){
- b->headptr=b->head->buffer->data+b->head->begin+b->head->length;
- b->headend=-1;
- b->headbit=0;
-}
-
-/* spans forward, skipping as many bytes as headend is negative; if
- headend is zero, simply finds next byte. If we're up to the end
- of the buffer, leaves headend at zero. If we've read past the end,
- halt the decode process. */
-static void _span(oggpack_buffer *b){
- while(b->headend<1){
- if(b->head->next){
- b->count+=b->head->length;
- b->head=b->head->next;
- b->headptr=b->head->buffer->data+b->head->begin-b->headend;
- b->headend+=b->head->length;
- }else{
- /* we've either met the end of decode, or gone past it. halt
- only if we're past */
- if(b->headend<0 || b->headbit)
- /* read has fallen off the end */
- _adv_halt(b);
-
- break;
- }
- }
-}
-
-void oggpack_readinit(oggpack_buffer *b,ogg_reference *r){
- memset(b,0,sizeof(*b));
-
- b->tail=b->head=r;
- b->count=0;
- b->headptr=b->head->buffer->data+b->head->begin;
- b->headend=b->head->length;
- _span(b);
-}
-
-#define _lookspan() while(!end){\
- head=head->next;\
- if(!head) return -1;\
- ptr=head->buffer->data + head->begin;\
- end=head->length;\
- }
-
-/* Read in bits without advancing the bitptr; bits <= 32 */
-long oggpack_look(oggpack_buffer *b,int bits){
- unsigned long m=mask[bits];
- unsigned long ret=-1;
-
- bits+=b->headbit;
-
- if(bits >= b->headend<<3){
- int end=b->headend;
- unsigned char *ptr=b->headptr;
- ogg_reference *head=b->head;
-
- if(end<0)return -1;
-
- if(bits){
- _lookspan();
- ret=*ptr++>>b->headbit;
- if(bits>8){
- --end;
- _lookspan();
- ret|=*ptr++<<(8-b->headbit);
- if(bits>16){
- --end;
- _lookspan();
- ret|=*ptr++<<(16-b->headbit);
- if(bits>24){
- --end;
- _lookspan();
- ret|=*ptr++<<(24-b->headbit);
- if(bits>32 && b->headbit){
- --end;
- _lookspan();
- ret|=*ptr<<(32-b->headbit);
- }
- }
- }
- }
- }
-
- }else{
-
- /* make this a switch jump-table */
- ret=b->headptr[0]>>b->headbit;
- if(bits>8){
- ret|=b->headptr[1]<<(8-b->headbit);
- if(bits>16){
- ret|=b->headptr[2]<<(16-b->headbit);
- if(bits>24){
- ret|=b->headptr[3]<<(24-b->headbit);
- if(bits>32 && b->headbit)
- ret|=b->headptr[4]<<(32-b->headbit);
- }
- }
- }
- }
-
- ret&=m;
- return ret;
-}
-
-/* limited to 32 at a time */
-void oggpack_adv(oggpack_buffer *b,int bits){
- bits+=b->headbit;
- b->headbit=bits&7;
- b->headptr+=bits/8;
- if((b->headend-=bits/8)<1)_span(b);
-}
-
-/* spans forward and finds next byte. Never halts */
-static void _span_one(oggpack_buffer *b){
- while(b->headend<1){
- if(b->head->next){
- b->count+=b->head->length;
- b->head=b->head->next;
- b->headptr=b->head->buffer->data+b->head->begin;
- b->headend=b->head->length;
- }else
- break;
- }
-}
-
-static int _halt_one(oggpack_buffer *b){
- if(b->headend<1){
- _adv_halt(b);
- return -1;
- }
- return 0;
-}
-
-int oggpack_eop(oggpack_buffer *b){
- if(b->headend<0)return -1;
- return 0;
-}
-
-/* bits <= 32 */
-long oggpack_read(oggpack_buffer *b,int bits){
- unsigned long m=mask[bits];
- ogg_uint32_t ret=-1;
-
- bits+=b->headbit;
-
- if(bits >= b->headend<<3){
-
- if(b->headend<0)return -1;
-
- if(bits){
- if (_halt_one(b)) return -1;
- ret=*b->headptr>>b->headbit;
-
- if(bits>=8){
- ++b->headptr;
- --b->headend;
- _span_one(b);
- if(bits>8){
- if (_halt_one(b)) return -1;
- ret|=*b->headptr<<(8-b->headbit);
-
- if(bits>=16){
- ++b->headptr;
- --b->headend;
- _span_one(b);
- if(bits>16){
- if (_halt_one(b)) return -1;
- ret|=*b->headptr<<(16-b->headbit);
-
- if(bits>=24){
- ++b->headptr;
- --b->headend;
- _span_one(b);
- if(bits>24){
- if (_halt_one(b)) return -1;
- ret|=*b->headptr<<(24-b->headbit);
-
- if(bits>=32){
- ++b->headptr;
- --b->headend;
- _span_one(b);
- if(bits>32){
- if (_halt_one(b)) return -1;
- if(b->headbit)ret|=*b->headptr<<(32-b->headbit);
-
- }
- }
- }
- }
- }
- }
- }
- }
- }
- }else{
-
- ret=b->headptr[0]>>b->headbit;
- if(bits>8){
- ret|=b->headptr[1]<<(8-b->headbit);
- if(bits>16){
- ret|=b->headptr[2]<<(16-b->headbit);
- if(bits>24){
- ret|=b->headptr[3]<<(24-b->headbit);
- if(bits>32 && b->headbit){
- ret|=b->headptr[4]<<(32-b->headbit);
- }
- }
- }
- }
-
- b->headptr+=bits/8;
- b->headend-=bits/8;
- }
-
- ret&=m;
- b->headbit=bits&7;
- return ret;
-}
-
-long oggpack_bytes(oggpack_buffer *b){
- return(b->count+b->headptr-b->head->buffer->data-b->head->begin+
- (b->headbit+7)/8);
-}
-
-long oggpack_bits(oggpack_buffer *b){
- return((b->count+b->headptr-b->head->buffer->data-b->head->begin)*8+
- b->headbit);
-}
-