misc/libtremor/bitwise.c
author nemo
Sun, 12 Jun 2011 10:16:38 -0400
changeset 5235 e30b06ffea3a
parent 5170 f7e49eff3708
permissions -rw-r--r--
Skip droplets if plain splash is enabled, add a sanity check just in case.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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/********************************************************************
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 *                                                                  *
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 * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE.   *
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 *                                                                  *
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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 OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
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 * BY THE Xiph.Org FOUNDATION 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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 ********************************************************************/
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/* We're 'LSb' endian; if we write a word but read individual bits,
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   then we'll read the lsb first */
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#include <string.h>
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#include <stdlib.h>
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#include "ogg.h"
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static unsigned long mask[]=
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{0x00000000,0x00000001,0x00000003,0x00000007,0x0000000f,
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 0x0000001f,0x0000003f,0x0000007f,0x000000ff,0x000001ff,
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 0x000003ff,0x000007ff,0x00000fff,0x00001fff,0x00003fff,
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 0x00007fff,0x0000ffff,0x0001ffff,0x0003ffff,0x0007ffff,
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 0x000fffff,0x001fffff,0x003fffff,0x007fffff,0x00ffffff,
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 0x01ffffff,0x03ffffff,0x07ffffff,0x0fffffff,0x1fffffff,
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 0x3fffffff,0x7fffffff,0xffffffff };
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/* mark read process as having run off the end */
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static void _adv_halt(oggpack_buffer *b){
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  b->headptr=b->head->buffer->data+b->head->begin+b->head->length;
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  b->headend=-1;
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  b->headbit=0;
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}
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/* spans forward, skipping as many bytes as headend is negative; if
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   headend is zero, simply finds next byte.  If we're up to the end
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   of the buffer, leaves headend at zero.  If we've read past the end,
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   halt the decode process. */
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static void _span(oggpack_buffer *b){
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  while(b->headend<1){
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    if(b->head->next){
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      b->count+=b->head->length;
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      b->head=b->head->next;
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      b->headptr=b->head->buffer->data+b->head->begin-b->headend;
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      b->headend+=b->head->length;
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    }else{
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      /* we've either met the end of decode, or gone past it. halt
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         only if we're past */
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      if(b->headend<0 || b->headbit)
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        /* read has fallen off the end */
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        _adv_halt(b);
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      break;
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    }
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  }
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}
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void oggpack_readinit(oggpack_buffer *b,ogg_reference *r){
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  memset(b,0,sizeof(*b));
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  b->tail=b->head=r;
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  b->count=0;
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  b->headptr=b->head->buffer->data+b->head->begin;
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  b->headend=b->head->length;
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  _span(b);
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}
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#define _lookspan()   while(!end){\
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                        head=head->next;\
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                        if(!head) return -1;\
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                        ptr=head->buffer->data + head->begin;\
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                        end=head->length;\
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                      }
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/* Read in bits without advancing the bitptr; bits <= 32 */
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long oggpack_look(oggpack_buffer *b,int bits){
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  unsigned long m=mask[bits];
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  unsigned long ret=-1;
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  bits+=b->headbit;
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  if(bits >= b->headend<<3){
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    int            end=b->headend;
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    unsigned char *ptr=b->headptr;
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    ogg_reference *head=b->head;
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    if(end<0)return -1;
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    if(bits){
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      _lookspan();
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      ret=*ptr++>>b->headbit;
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      if(bits>8){
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        --end;
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        _lookspan();
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        ret|=*ptr++<<(8-b->headbit);
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        if(bits>16){
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          --end;
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          _lookspan();
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          ret|=*ptr++<<(16-b->headbit);
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          if(bits>24){
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            --end;
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            _lookspan();
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            ret|=*ptr++<<(24-b->headbit);
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            if(bits>32 && b->headbit){
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              --end;
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              _lookspan();
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              ret|=*ptr<<(32-b->headbit);
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            }
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          }
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        }
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      }
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    }
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  }else{
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    /* make this a switch jump-table */
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    ret=b->headptr[0]>>b->headbit;
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    if(bits>8){
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      ret|=b->headptr[1]<<(8-b->headbit);  
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      if(bits>16){
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        ret|=b->headptr[2]<<(16-b->headbit);  
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        if(bits>24){
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          ret|=b->headptr[3]<<(24-b->headbit);  
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          if(bits>32 && b->headbit)
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            ret|=b->headptr[4]<<(32-b->headbit);
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        }
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      }
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    }
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  }
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  ret&=m;
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  return ret;
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}
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/* limited to 32 at a time */
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void oggpack_adv(oggpack_buffer *b,int bits){
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  bits+=b->headbit;
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  b->headbit=bits&7;
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  b->headptr+=bits/8;
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  if((b->headend-=bits/8)<1)_span(b);
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}
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/* spans forward and finds next byte.  Never halts */
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static void _span_one(oggpack_buffer *b){
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  while(b->headend<1){
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    if(b->head->next){
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      b->count+=b->head->length;
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      b->head=b->head->next;
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      b->headptr=b->head->buffer->data+b->head->begin;
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      b->headend=b->head->length;
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    }else
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      break;
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  }
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}
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static int _halt_one(oggpack_buffer *b){
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  if(b->headend<1){
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    _adv_halt(b);
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    return -1;
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  }
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  return 0;
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}
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int oggpack_eop(oggpack_buffer *b){
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  if(b->headend<0)return -1;
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  return 0;
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}
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/* bits <= 32 */
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long oggpack_read(oggpack_buffer *b,int bits){
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  unsigned long m=mask[bits];
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  ogg_uint32_t ret=-1;
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  bits+=b->headbit;
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  if(bits >= b->headend<<3){
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    if(b->headend<0)return -1;
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    if(bits){
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      if (_halt_one(b)) return -1;
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      ret=*b->headptr>>b->headbit;
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      if(bits>=8){
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        ++b->headptr;
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        --b->headend;
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        _span_one(b);
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        if(bits>8){
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          if (_halt_one(b)) return -1;
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          ret|=*b->headptr<<(8-b->headbit);
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          if(bits>=16){
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            ++b->headptr;
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            --b->headend;
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            _span_one(b);
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            if(bits>16){
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              if (_halt_one(b)) return -1;
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              ret|=*b->headptr<<(16-b->headbit);
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              if(bits>=24){
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                ++b->headptr;
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                --b->headend;
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                _span_one(b);
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                if(bits>24){
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                  if (_halt_one(b)) return -1;
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                  ret|=*b->headptr<<(24-b->headbit);
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   213
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                  if(bits>=32){
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                    ++b->headptr;
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                    --b->headend;
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                    _span_one(b);
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                    if(bits>32){
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                      if (_halt_one(b)) return -1;
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                      if(b->headbit)ret|=*b->headptr<<(32-b->headbit);
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                    }
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                  }
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                }
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              }
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            }
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          }
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        }
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      }
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    }
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  }else{
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    ret=b->headptr[0]>>b->headbit;
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   234
    if(bits>8){
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      ret|=b->headptr[1]<<(8-b->headbit);
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   236
      if(bits>16){
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        ret|=b->headptr[2]<<(16-b->headbit);
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   238
        if(bits>24){
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   239
          ret|=b->headptr[3]<<(24-b->headbit);
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   240
          if(bits>32 && b->headbit){
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            ret|=b->headptr[4]<<(32-b->headbit);
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   242
          }
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        }
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   244
      }
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   245
    }
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   246
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    b->headptr+=bits/8;
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    b->headend-=bits/8;
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   249
  }
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  ret&=m;
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   252
  b->headbit=bits&7;
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   253
  return ret;
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   254
}
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long oggpack_bytes(oggpack_buffer *b){
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   257
  return(b->count+b->headptr-b->head->buffer->data-b->head->begin+
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         (b->headbit+7)/8);
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}
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long oggpack_bits(oggpack_buffer *b){
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   262
  return((b->count+b->headptr-b->head->buffer->data-b->head->begin)*8+
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         b->headbit);
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}
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   265