The Tor Browser: media/libtremor/lib/tremor_info.c@b8a032363ba2 (annotated)

media/libtremor/lib/tremor_info.c@b8a032363ba2 (annotated)

media/libtremor/lib/tremor_info.c

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /********************************************************************
  *                                                                  *
  * 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 1994-2003    *
  * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
  *                                                                  *
  ********************************************************************
  function: maintain the info structure, info <-> header packets
  ********************************************************************/
 /* general handling of the header and the vorbis_info structure (and
    substructures) */
 #include <stdlib.h>
 #include <string.h>
 #include <ctype.h>
 #include <limits.h>
 #include <ogg/ogg.h>
 #include "ivorbiscodec.h"
 #include "codec_internal.h"
 #include "codebook.h"
 #include "registry.h"
 #include "window.h"
 #include "misc.h"
 /* helpers */
 static void _v_readstring(oggpack_buffer *o,char *buf,int bytes){
   while(bytes--){
     *buf++=oggpack_read(o,8);
   }
 }
 void vorbis_comment_init(vorbis_comment *vc){
   memset(vc,0,sizeof(*vc));
 }
 /* This is more or less the same as strncasecmp - but that doesn't exist
  * everywhere, and this is a fairly trivial function, so we include it */
 static int tagcompare(const char *s1, const char *s2, int n){
   int c=0;
   while(c < n){
     if(toupper(s1[c]) != toupper(s2[c]))
       return !0;
     c++;
   }
   return 0;
 }
 char *vorbis_comment_query(vorbis_comment *vc, char *tag, int count){
   long i;
   int found = 0;
   int taglen = strlen(tag)+1; /* +1 for the = we append */
   char *fulltag = (char *)alloca(taglen+ 1);
   strcpy(fulltag, tag);
   strcat(fulltag, "=");
   for(i=0;i<vc->comments;i++){
     if(!tagcompare(vc->user_comments[i], fulltag, taglen)){
       if(count == found)
 	/* We return a pointer to the data, not a copy */
       	return vc->user_comments[i] + taglen;
       else
 	found++;
     }
   }
   return NULL; /* didn't find anything */
 }
 int vorbis_comment_query_count(vorbis_comment *vc, char *tag){
   int i,count=0;
   int taglen = strlen(tag)+1; /* +1 for the = we append */
   char *fulltag = (char *)alloca(taglen+1);
   strcpy(fulltag,tag);
   strcat(fulltag, "=");
   for(i=0;i<vc->comments;i++){
     if(!tagcompare(vc->user_comments[i], fulltag, taglen))
       count++;
   }
   return count;
 }
 void vorbis_comment_clear(vorbis_comment *vc){
   if(vc){
     long i;
     if(vc->user_comments){
       for(i=0;i<vc->comments;i++)
         if(vc->user_comments[i])_ogg_free(vc->user_comments[i]);
       _ogg_free(vc->user_comments);
     }
     if(vc->comment_lengths)_ogg_free(vc->comment_lengths);
     if(vc->vendor)_ogg_free(vc->vendor);
     memset(vc,0,sizeof(*vc));
   }
 }
 /* blocksize 0 is guaranteed to be short, 1 is guarantted to be long.
    They may be equal, but short will never ge greater than long */
 int vorbis_info_blocksize(vorbis_info *vi,int zo){
   codec_setup_info *ci = (codec_setup_info *)vi->codec_setup;
   return ci ? ci->blocksizes[zo] : -1;
 }
 /* used by synthesis, which has a full, alloced vi */
 void vorbis_info_init(vorbis_info *vi){
   memset(vi,0,sizeof(*vi));
   vi->codec_setup=(codec_setup_info *)_ogg_calloc(1,sizeof(codec_setup_info));
 }
 void vorbis_info_clear(vorbis_info *vi){
   codec_setup_info     *ci=(codec_setup_info *)vi->codec_setup;
   int i;
   if(ci){
     for(i=0;i<ci->modes;i++)
       if(ci->mode_param[i])_ogg_free(ci->mode_param[i]);
     for(i=0;i<ci->maps;i++) /* unpack does the range checking */
       if(ci->map_param[i])
 	_mapping_P[ci->map_type[i]]->free_info(ci->map_param[i]);
     for(i=0;i<ci->floors;i++) /* unpack does the range checking */
       if(ci->floor_param[i])
 	_floor_P[ci->floor_type[i]]->free_info(ci->floor_param[i]);
     for(i=0;i<ci->residues;i++) /* unpack does the range checking */
       if(ci->residue_param[i])
 	_residue_P[ci->residue_type[i]]->free_info(ci->residue_param[i]);
     for(i=0;i<ci->books;i++){
       if(ci->book_param[i]){
 	/* knows if the book was not alloced */
 	vorbis_staticbook_destroy(ci->book_param[i]);
       }
       if(ci->fullbooks)
 	vorbis_book_clear(ci->fullbooks+i);
     }
     if(ci->fullbooks)
 	_ogg_free(ci->fullbooks);
     _ogg_free(ci);
   }
   memset(vi,0,sizeof(*vi));
 }
 /* Header packing/unpacking ********************************************/
 static int _vorbis_unpack_info(vorbis_info *vi,oggpack_buffer *opb){
   codec_setup_info     *ci=(codec_setup_info *)vi->codec_setup;
   if(!ci)return(OV_EFAULT);
   vi->version=oggpack_read(opb,32);
   if(vi->version!=0)return(OV_EVERSION);
   vi->channels=oggpack_read(opb,8);
   vi->rate=oggpack_read(opb,32);
   vi->bitrate_upper=oggpack_read(opb,32);
   vi->bitrate_nominal=oggpack_read(opb,32);
   vi->bitrate_lower=oggpack_read(opb,32);
   ci->blocksizes[0]=1<<oggpack_read(opb,4);
   ci->blocksizes[1]=1<<oggpack_read(opb,4);
   if(vi->rate<1)goto err_out;
   if(vi->channels<1)goto err_out;
   if(ci->blocksizes[0]<64)goto err_out;
   if(ci->blocksizes[1]<ci->blocksizes[0])goto err_out;
   if(ci->blocksizes[1]>8192)goto err_out;
   if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */
   return(0);
  err_out:
   vorbis_info_clear(vi);
   return(OV_EBADHEADER);
 }
 static int _vorbis_unpack_comment(vorbis_comment *vc,oggpack_buffer *opb){
   int i;
   int vendorlen;
   vendorlen=oggpack_read(opb,32);
   if(vendorlen<0)goto err_out;
   if(vendorlen>opb->storage-oggpack_bytes(opb))goto err_out;
   vc->vendor=(char *)_ogg_calloc(vendorlen+1,1);
   if(vc->vendor==NULL)goto err_out;
   _v_readstring(opb,vc->vendor,vendorlen);
   i=oggpack_read(opb,32);
   if(i<0||i>=INT_MAX||i>(opb->storage-oggpack_bytes(opb))>>2)goto err_out;
   vc->user_comments=(char **)_ogg_calloc(i+1,sizeof(*vc->user_comments));
   vc->comment_lengths=(int *)_ogg_calloc(i+1, sizeof(*vc->comment_lengths));
   if(vc->user_comments==NULL||vc->comment_lengths==NULL)goto err_out;
   vc->comments=i;
   for(i=0;i<vc->comments;i++){
     int len=oggpack_read(opb,32);
     if(len<0||len>opb->storage-oggpack_bytes(opb))goto err_out;
     vc->comment_lengths[i]=len;
     vc->user_comments[i]=(char *)_ogg_calloc(len+1,1);
     if(vc->user_comments[i]==NULL){
       vc->comments=i;
       goto err_out;
     }
     _v_readstring(opb,vc->user_comments[i],len);
   }
   if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */
   return(0);
  err_out:
   vorbis_comment_clear(vc);
   return(OV_EBADHEADER);
 }
 /* all of the real encoding details are here.  The modes, books,
    everything */
 static int _vorbis_unpack_books(vorbis_info *vi,oggpack_buffer *opb){
   codec_setup_info     *ci=(codec_setup_info *)vi->codec_setup;
   int i;
   if(!ci)return(OV_EFAULT);
   /* codebooks */
   ci->books=oggpack_read(opb,8)+1;
   if(ci->books<=0)goto err_out;
   for(i=0;i<ci->books;i++){
     ci->book_param[i]=vorbis_staticbook_unpack(opb);
     if(!ci->book_param[i])goto err_out;
   }
   /* time backend settings */
   ci->times=oggpack_read(opb,6)+1;
   if(ci->times<=0)goto err_out;
   for(i=0;i<ci->times;i++){
     ci->time_type[i]=oggpack_read(opb,16);
     if(ci->time_type[i]<0 || ci->time_type[i]>=VI_TIMEB)goto err_out;
     /* ci->time_param[i]=_time_P[ci->time_type[i]]->unpack(vi,opb);
        Vorbis I has no time backend */
     /*if(!ci->time_param[i])goto err_out;*/
   }
   /* floor backend settings */
   ci->floors=oggpack_read(opb,6)+1;
   if(ci->floors<=0)goto err_out;
   for(i=0;i<ci->floors;i++){
     ci->floor_type[i]=oggpack_read(opb,16);
     if(ci->floor_type[i]<0 || ci->floor_type[i]>=VI_FLOORB)goto err_out;
     ci->floor_param[i]=_floor_P[ci->floor_type[i]]->unpack(vi,opb);
     if(!ci->floor_param[i])goto err_out;
   }
   /* residue backend settings */
   ci->residues=oggpack_read(opb,6)+1;
   if(ci->residues<=0)goto err_out;
   for(i=0;i<ci->residues;i++){
     ci->residue_type[i]=oggpack_read(opb,16);
     if(ci->residue_type[i]<0 || ci->residue_type[i]>=VI_RESB)goto err_out;
     ci->residue_param[i]=_residue_P[ci->residue_type[i]]->unpack(vi,opb);
     if(!ci->residue_param[i])goto err_out;
   }
   /* map backend settings */
   ci->maps=oggpack_read(opb,6)+1;
   if(ci->maps<=0)goto err_out;
   for(i=0;i<ci->maps;i++){
     ci->map_type[i]=oggpack_read(opb,16);
     if(ci->map_type[i]<0 || ci->map_type[i]>=VI_MAPB)goto err_out;
     ci->map_param[i]=_mapping_P[ci->map_type[i]]->unpack(vi,opb);
     if(!ci->map_param[i])goto err_out;
   }
   /* mode settings */
   ci->modes=oggpack_read(opb,6)+1;
   if(ci->modes<=0)goto err_out;
   for(i=0;i<ci->modes;i++){
     ci->mode_param[i]=(vorbis_info_mode *)_ogg_calloc(1,sizeof(*ci->mode_param[i]));
     ci->mode_param[i]->blockflag=oggpack_read(opb,1);
     ci->mode_param[i]->windowtype=oggpack_read(opb,16);
     ci->mode_param[i]->transformtype=oggpack_read(opb,16);
     ci->mode_param[i]->mapping=oggpack_read(opb,8);
     if(ci->mode_param[i]->windowtype>=VI_WINDOWB)goto err_out;
     if(ci->mode_param[i]->transformtype>=VI_WINDOWB)goto err_out;
     if(ci->mode_param[i]->mapping>=ci->maps)goto err_out;
     if(ci->mode_param[i]->mapping<0)goto err_out;
   }
   if(oggpack_read(opb,1)!=1)goto err_out; /* top level EOP check */
   return(0);
  err_out:
   vorbis_info_clear(vi);
   return(OV_EBADHEADER);
 }
 /* Is this packet a vorbis ID header? */
 int vorbis_synthesis_idheader(ogg_packet *op){
   oggpack_buffer opb;
   char buffer[6];
   if(op){
     oggpack_readinit(&opb,op->packet,op->bytes);
     if(!op->b_o_s)
       return(0); /* Not the initial packet */
     if(oggpack_read(&opb,8) != 1)
       return 0; /* not an ID header */
     memset(buffer,0,6);
     _v_readstring(&opb,buffer,6);
     if(memcmp(buffer,"vorbis",6))
       return 0; /* not vorbis */
     return 1;
   }
   return 0;
 }
 /* The Vorbis header is in three packets; the initial small packet in
    the first page that identifies basic parameters, a second packet
    with bitstream comments and a third packet that holds the
    codebook. */
 int vorbis_synthesis_headerin(vorbis_info *vi,vorbis_comment *vc,ogg_packet *op){
   oggpack_buffer opb;
   if(op){
     oggpack_readinit(&opb,op->packet,op->bytes);
     /* Which of the three types of header is this? */
     /* Also verify header-ness, vorbis */
     {
       char buffer[6];
       int packtype=oggpack_read(&opb,8);
       memset(buffer,0,6);
       _v_readstring(&opb,buffer,6);
       if(memcmp(buffer,"vorbis",6)){
 	/* not a vorbis header */
 	return(OV_ENOTVORBIS);
       }
       switch(packtype){
       case 0x01: /* least significant *bit* is read first */
 	if(!op->b_o_s){
 	  /* Not the initial packet */
 	  return(OV_EBADHEADER);
 	}
 	if(vi->rate!=0){
 	  /* previously initialized info header */
 	  return(OV_EBADHEADER);
 	}
 	return(_vorbis_unpack_info(vi,&opb));
       case 0x03: /* least significant *bit* is read first */
 	if(vi->rate==0){
 	  /* um... we didn't get the initial header */
 	  return(OV_EBADHEADER);
 	}
 	return(_vorbis_unpack_comment(vc,&opb));
       case 0x05: /* least significant *bit* is read first */
 	if(vi->rate==0 || vc->vendor==NULL){
 	  /* um... we didn;t get the initial header or comments yet */
 	  return(OV_EBADHEADER);
 	}
 	return(_vorbis_unpack_books(vi,&opb));
       default:
 	/* Not a valid vorbis header type */
 	return(OV_EBADHEADER);
 	break;
       }
     }
   }
   return(OV_EBADHEADER);
 }

The Tor Browser / annotate

media/libtremor/lib/tremor_info.c@b8a032363ba2 (annotated)

media/libtremor/lib/tremor_info.c