lib/floor0.c

   1 /********************************************************************
   2  *                                                                  *
   3  * THIS FILE IS PART OF THE Ogg Vorbis SOFTWARE CODEC SOURCE CODE.  *
   4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS SOURCE IS GOVERNED BY *
   5  * THE GNU PUBLIC LICENSE 2, WHICH IS INCLUDED WITH THIS SOURCE.    *
   6  * PLEASE READ THESE TERMS DISTRIBUTING.                            *
   7  *                                                                  *
   8  * THE OggSQUISH SOURCE CODE IS (C) COPYRIGHT 1994-2000             *
   9  * by Monty <monty@xiph.org> and The XIPHOPHORUS Company            *
  10  * http://www.xiph.org/                                             *
  11  *                                                                  *
  12  ********************************************************************
  13
  14  function: floor backend 0 implementation
  15  last mod: $Id: floor0.c,v 1.1 2000/01/20 04:42:55 xiphmont Exp $
  16
  17  ********************************************************************/
  18
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include "vorbis/codec.h"
  22 #include "bitwise.h"
  23 #include "registry.h"
  24 #include "floor0.h"
  25
  26 extern _vi_info_floor *_vorbis_floor0_dup(_vi_info_floor *source){
  27   vorbis_info_floor0 *d=malloc(sizeof(vorbis_info_floor0));
  28   memcpy(d,source,sizeof(vorbis_info_floor0));
  29   if(d->stages){
  30     d->books=malloc(sizeof(int)*d->stages);
  31     memcpy(d->books,((vorbis_info_floor0 *)source)->books,
  32            sizeof(int)*d->stages);
  33   }
  34   return(d);
  35 }
  36
  37 extern void _vorbis_floor0_free(_vi_info_floor *i){
  38   vorbis_info_floor0 *d=(vorbis_info_floor0 *)i;
  39   if(d){
  40     if(d->books)free(d->books);
  41     memset(i,0,sizeof(vorbis_info_floor0));
  42   }
  43 }
  44
  45 extern void _vorbis_floor0_pack(oggpack_buffer *opb,_vi_info_floor *vi){
  46   vorbis_info_floor0 *d=(vorbis_info_floor0 *)vi;
  47   int i;
  48   _oggpack_write(opb,d->order,8);
  49   _oggpack_write(opb,d->rate,16);
  50   _oggpack_write(opb,d->barkmap,16);
  51   _oggpack_write(opb,d->stages,8);
  52   for(i=0;i<d->stages;i++)
  53     _oggpack_write(opb,d->books[i],8);
  54 }
  55
  56 extern _vi_info_floor *_vorbis_floor0_unpack(vorbis_info *vi,
  57                                              oggpack_buffer *opb){
  58   vorbis_info_floor0 d;
  59   int i;
  60   d.order=_oggpack_read(opb,8);
  61   d.rate=_oggpack_read(opb,16);
  62   d.barkmap=_oggpack_read(opb,16);
  63   d.stages=_oggpack_read(opb,8);
  64
  65   if(d.order<1)return(NULL);
  66   if(d.rate<1)return(NULL);
  67   if(d.barkmap<1)return(NULL);
  68   if(d.stages<1)return(NULL);
  69
  70   d.books=alloca(sizeof(int)*d.stages);
  71   for(i=0;i<d.stages;i++){
  72     d.books[i]=_oggpack_read(opb,8);
  73     if(d.books[i]<0 || d.books[i]>=vi->books)return(NULL);
  74   }
  75   return(_vorbis_floor0_dup(&d));
  76 }