The Tor Browser: media/libtheora/lib/info.c@b8a032363ba2

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

     1 /********************************************************************

     2  *                                                                  *

     3  * THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE.   *

     4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *

     5  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *

     6  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *

     7  *                                                                  *

     8  * THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009                *

     9  * by the Xiph.Org Foundation and contributors http://www.xiph.org/ *

    10  *                                                                  *

    11  ********************************************************************

    13   function:

    14     last mod: $Id: info.c 16503 2009-08-22 18:14:02Z giles $

    16  ********************************************************************/

    18 #include <stdlib.h>

    19 #include <ctype.h>

    20 #include <string.h>

    21 #include "internal.h"

    25 /*This is more or less the same as strncasecmp, but that doesn't exist

    26    everywhere, and this is a fairly trivial function, so we include it.

    27   Note: We take advantage of the fact that we know _n is less than or equal to

    28    the length of at least one of the strings.*/

    29 static int oc_tagcompare(const char *_s1,const char *_s2,int _n){

    30   int c;

    31   for(c=0;c<_n;c++){

    32     if(toupper(_s1[c])!=toupper(_s2[c]))return !0;

    33   }

    34   return _s1[c]!='=';

    35 }

    39 void th_info_init(th_info *_info){

    40   memset(_info,0,sizeof(*_info));

    41   _info->version_major=TH_VERSION_MAJOR;

    42   _info->version_minor=TH_VERSION_MINOR;

    43   _info->version_subminor=TH_VERSION_SUB;

    44   _info->keyframe_granule_shift=6;

    45 }

    47 void th_info_clear(th_info *_info){

    48   memset(_info,0,sizeof(*_info));

    49 }

    53 void th_comment_init(th_comment *_tc){

    54   memset(_tc,0,sizeof(*_tc));

    55 }

    57 void th_comment_add(th_comment *_tc,char *_comment){

    58   char **user_comments;

    59   int   *comment_lengths;

    60   int    comment_len;

    61   user_comments=_ogg_realloc(_tc->user_comments,

    62    (_tc->comments+2)*sizeof(*_tc->user_comments));

    63   if(user_comments==NULL)return;

    64   _tc->user_comments=user_comments;

    65   comment_lengths=_ogg_realloc(_tc->comment_lengths,

    66    (_tc->comments+2)*sizeof(*_tc->comment_lengths));

    67   if(comment_lengths==NULL)return;

    68   _tc->comment_lengths=comment_lengths;

    69   comment_len=strlen(_comment);

    70   comment_lengths[_tc->comments]=comment_len;

    71   user_comments[_tc->comments]=_ogg_malloc(comment_len+1);

    72   if(user_comments[_tc->comments]==NULL)return;

    73   memcpy(_tc->user_comments[_tc->comments],_comment,comment_len+1);

    74   _tc->comments++;

    75   _tc->user_comments[_tc->comments]=NULL;

    76 }

    78 void th_comment_add_tag(th_comment *_tc,char *_tag,char *_val){

    79   char *comment;

    80   int   tag_len;

    81   int   val_len;

    82   tag_len=strlen(_tag);

    83   val_len=strlen(_val);

    84   /*+2 for '=' and '\0'.*/

    85   comment=_ogg_malloc(tag_len+val_len+2);

    86   if(comment==NULL)return;

    87   memcpy(comment,_tag,tag_len);

    88   comment[tag_len]='=';

    89   memcpy(comment+tag_len+1,_val,val_len+1);

    90   th_comment_add(_tc,comment);

    91   _ogg_free(comment);

    92 }

    94 char *th_comment_query(th_comment *_tc,char *_tag,int _count){

    95   long i;

    96   int  found;

    97   int  tag_len;

    98   tag_len=strlen(_tag);

    99   found=0;

   100   for(i=0;i<_tc->comments;i++){

   101     if(!oc_tagcompare(_tc->user_comments[i],_tag,tag_len)){

   102       /*We return a pointer to the data, not a copy.*/

   103       if(_count==found++)return _tc->user_comments[i]+tag_len+1;

   104     }

   105   }

   106   /*Didn't find anything.*/

   107   return NULL;

   108 }

   110 int th_comment_query_count(th_comment *_tc,char *_tag){

   111   long i;

   112   int  tag_len;

   113   int  count;

   114   tag_len=strlen(_tag);

   115   count=0;

   116   for(i=0;i<_tc->comments;i++){

   117     if(!oc_tagcompare(_tc->user_comments[i],_tag,tag_len))count++;

   118   }

   119   return count;

   120 }

   122 void th_comment_clear(th_comment *_tc){

   123   if(_tc!=NULL){

   124     long i;

   125     for(i=0;i<_tc->comments;i++)_ogg_free(_tc->user_comments[i]);

   126     _ogg_free(_tc->user_comments);

   127     _ogg_free(_tc->comment_lengths);

   128     _ogg_free(_tc->vendor);

   129     memset(_tc,0,sizeof(*_tc));

   130   }

   131 }

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