initial commit, 4.5 stable

thirdparty/libtheora/decinfo.c

@@ -0,0 +1,279 @@
+/********************************************************************
+ *                                                                  *
+ * THIS FILE IS PART OF THE OggTheora SOFTWARE 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 Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009                *
+ * by the Xiph.Org Foundation and contributors                      *
+ * https://www.xiph.org/                                            *
+ *                                                                  *
+ ********************************************************************
+
+  function:
+
+ ********************************************************************/
+
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include "decint.h"
+
+/*Only used for fuzzing.*/
+#if defined(HAVE_MEMORY_CONSTRAINT)
+static const int MAX_FUZZING_WIDTH = 16384;
+static const int MAX_FUZZING_HEIGHT = 16384;
+#endif
+
+
+/*Unpacks a series of octets from a given byte array into the pack buffer.
+  No checking is done to ensure the buffer contains enough data.
+  _opb: The pack buffer to read the octets from.
+  _buf: The byte array to store the unpacked bytes in.
+  _len: The number of octets to unpack.*/
+static void oc_unpack_octets(oc_pack_buf *_opb,char *_buf,size_t _len){
+  while(_len-->0){
+    long val;
+    val=oc_pack_read(_opb,8);
+    *_buf++=(char)val;
+  }
+}
+
+/*Unpacks a 32-bit integer encoded by octets in little-endian form.*/
+static long oc_unpack_length(oc_pack_buf *_opb){
+  long ret[4];
+  int  i;
+  for(i=0;i<4;i++)ret[i]=oc_pack_read(_opb,8);
+  return ret[0]|ret[1]<<8|ret[2]<<16|ret[3]<<24;
+}
+
+static int oc_info_unpack(oc_pack_buf *_opb,th_info *_info){
+  long val;
+  /*Check the codec bitstream version.*/
+  val=oc_pack_read(_opb,8);
+  _info->version_major=(unsigned char)val;
+  val=oc_pack_read(_opb,8);
+  _info->version_minor=(unsigned char)val;
+  val=oc_pack_read(_opb,8);
+  _info->version_subminor=(unsigned char)val;
+  /*verify we can parse this bitstream version.
+     We accept earlier minors and all subminors, by spec*/
+  if(_info->version_major>TH_VERSION_MAJOR||
+   (_info->version_major==TH_VERSION_MAJOR&&
+   _info->version_minor>TH_VERSION_MINOR)){
+    return TH_EVERSION;
+  }
+  /*Read the encoded frame description.*/
+  val=oc_pack_read(_opb,16);
+  _info->frame_width=(ogg_uint32_t)val<<4;
+  val=oc_pack_read(_opb,16);
+  _info->frame_height=(ogg_uint32_t)val<<4;
+  val=oc_pack_read(_opb,24);
+  _info->pic_width=(ogg_uint32_t)val;
+  val=oc_pack_read(_opb,24);
+  _info->pic_height=(ogg_uint32_t)val;
+  val=oc_pack_read(_opb,8);
+  _info->pic_x=(ogg_uint32_t)val;
+  val=oc_pack_read(_opb,8);
+  _info->pic_y=(ogg_uint32_t)val;
+  val=oc_pack_read(_opb,32);
+  _info->fps_numerator=(ogg_uint32_t)val;
+  val=oc_pack_read(_opb,32);
+  _info->fps_denominator=(ogg_uint32_t)val;
+  if(_info->frame_width==0||_info->frame_height==0||
+   _info->pic_width+_info->pic_x>_info->frame_width||
+   _info->pic_height+_info->pic_y>_info->frame_height||
+   _info->fps_numerator==0||_info->fps_denominator==0){
+    return TH_EBADHEADER;
+  }
+#if defined(HAVE_MEMORY_CONSTRAINT)
+  if(_info->frame_width>=MAX_FUZZING_WIDTH&&_info->frame_height>=MAX_FUZZING_HEIGHT){
+    return TH_EBADHEADER;
+  }
+#endif
+  /*Note: The sense of pic_y is inverted in what we pass back to the
+     application compared to how it is stored in the bitstream.
+    This is because the bitstream uses a right-handed coordinate system, while
+     applications expect a left-handed one.*/
+  _info->pic_y=_info->frame_height-_info->pic_height-_info->pic_y;
+  val=oc_pack_read(_opb,24);
+  _info->aspect_numerator=(ogg_uint32_t)val;
+  val=oc_pack_read(_opb,24);
+  _info->aspect_denominator=(ogg_uint32_t)val;
+  val=oc_pack_read(_opb,8);
+  _info->colorspace=(th_colorspace)val;
+  val=oc_pack_read(_opb,24);
+  _info->target_bitrate=(int)val;
+  val=oc_pack_read(_opb,6);
+  _info->quality=(int)val;
+  val=oc_pack_read(_opb,5);
+  _info->keyframe_granule_shift=(int)val;
+  val=oc_pack_read(_opb,2);
+  _info->pixel_fmt=(th_pixel_fmt)val;
+  if(_info->pixel_fmt==TH_PF_RSVD)return TH_EBADHEADER;
+  val=oc_pack_read(_opb,3);
+  if(val!=0||oc_pack_bytes_left(_opb)<0)return TH_EBADHEADER;
+  return 0;
+}
+
+static int oc_comment_unpack(oc_pack_buf *_opb,th_comment *_tc){
+  long len;
+  int  i;
+  /*Read the vendor string.*/
+  len=oc_unpack_length(_opb);
+  if(len<0||len>oc_pack_bytes_left(_opb))return TH_EBADHEADER;
+  _tc->vendor=_ogg_malloc((size_t)len+1);
+  if(_tc->vendor==NULL)return TH_EFAULT;
+  oc_unpack_octets(_opb,_tc->vendor,len);
+  _tc->vendor[len]='\0';
+  /*Read the user comments.*/
+  _tc->comments=(int)oc_unpack_length(_opb);
+  len=_tc->comments;
+  if(len<0||len>(LONG_MAX>>2)||len<<2>oc_pack_bytes_left(_opb)){
+    _tc->comments=0;
+    return TH_EBADHEADER;
+  }
+  if(0<_tc->comments){
+    _tc->comment_lengths=(int *)_ogg_malloc(
+     _tc->comments*sizeof(_tc->comment_lengths[0]));
+    _tc->user_comments=(char **)_ogg_malloc(
+     _tc->comments*sizeof(_tc->user_comments[0]));
+    if(_tc->comment_lengths==NULL||_tc->user_comments==NULL){
+      _tc->comments=0;
+      return TH_EFAULT;
+    }
+    for(i=0;i<_tc->comments;i++){
+      len=oc_unpack_length(_opb);
+      if(len<0||len>oc_pack_bytes_left(_opb)){
+        _tc->comments=i;
+        return TH_EBADHEADER;
+      }
+      _tc->comment_lengths[i]=len;
+      _tc->user_comments[i]=_ogg_malloc((size_t)len+1);
+      if(_tc->user_comments[i]==NULL){
+        _tc->comments=i;
+        return TH_EFAULT;
+      }
+      oc_unpack_octets(_opb,_tc->user_comments[i],len);
+      _tc->user_comments[i][len]='\0';
+    }
+  } else {
+    _tc->comment_lengths=NULL;
+    _tc->user_comments=NULL;
+  }
+  return oc_pack_bytes_left(_opb)<0?TH_EBADHEADER:0;
+}
+
+static int oc_setup_unpack(oc_pack_buf *_opb,th_setup_info *_setup){
+  int ret;
+  /*Read the quantizer tables.*/
+  ret=oc_quant_params_unpack(_opb,&_setup->qinfo);
+  if(ret<0)return ret;
+  /*Read the Huffman trees.*/
+  return oc_huff_trees_unpack(_opb,_setup->huff_tables);
+}
+
+static void oc_setup_clear(th_setup_info *_setup){
+  oc_quant_params_clear(&_setup->qinfo);
+  oc_huff_trees_clear(_setup->huff_tables);
+}
+
+static int oc_dec_headerin(oc_pack_buf *_opb,th_info *_info,
+ th_comment *_tc,th_setup_info **_setup,ogg_packet *_op){
+  char buffer[6];
+  long val;
+  int  packtype;
+  int  ret;
+  val=oc_pack_read(_opb,8);
+  packtype=(int)val;
+  /*If we're at a data packet...*/
+  if(!(packtype&0x80)){
+    /*Check to make sure we received all three headers...
+      If we haven't seen any valid headers, assume this is not actually
+       Theora.*/
+    if(_info->frame_width<=0)return TH_ENOTFORMAT;
+    /*Follow our documentation, which says we'll return TH_EFAULT if this
+       are NULL (_info was checked by our caller).*/
+    if(_tc==NULL)return TH_EFAULT;
+    /*And if any other headers were missing, declare this packet "out of
+       sequence" instead.*/
+    if(_tc->vendor==NULL)return TH_EBADHEADER;
+    /*Don't check this until it's needed, since we allow passing NULL for the
+       arguments that we're not expecting the next header to fill in yet.*/
+    if(_setup==NULL)return TH_EFAULT;
+    if(*_setup==NULL)return TH_EBADHEADER;
+    /*If we got everything, we're done.*/
+    return 0;
+  }
+  /*Check the codec string.*/
+  oc_unpack_octets(_opb,buffer,6);
+  if(memcmp(buffer,"theora",6)!=0)return TH_ENOTFORMAT;
+  switch(packtype){
+    /*Codec info header.*/
+    case 0x80:{
+      /*This should be the first packet, and we should not already be
+         initialized.*/
+      if(!_op->b_o_s||_info->frame_width>0)return TH_EBADHEADER;
+      ret=oc_info_unpack(_opb,_info);
+      if(ret<0)th_info_clear(_info);
+      else ret=3;
+    }break;
+    /*Comment header.*/
+    case 0x81:{
+      if(_tc==NULL)return TH_EFAULT;
+      /*We should have already decoded the info header, and should not yet have
+         decoded the comment header.*/
+      if(_info->frame_width==0||_tc->vendor!=NULL)return TH_EBADHEADER;
+      ret=oc_comment_unpack(_opb,_tc);
+      if(ret<0)th_comment_clear(_tc);
+      else ret=2;
+    }break;
+    /*Codec setup header.*/
+    case 0x82:{
+      oc_setup_info *setup;
+      if(_tc==NULL||_setup==NULL)return TH_EFAULT;
+      /*We should have already decoded the info header and the comment header,
+         and should not yet have decoded the setup header.*/
+      if(_info->frame_width==0||_tc->vendor==NULL||*_setup!=NULL){
+        return TH_EBADHEADER;
+      }
+      setup=(oc_setup_info *)_ogg_calloc(1,sizeof(*setup));
+      if(setup==NULL)return TH_EFAULT;
+      ret=oc_setup_unpack(_opb,setup);
+      if(ret<0){
+        oc_setup_clear(setup);
+        _ogg_free(setup);
+      }
+      else{
+        *_setup=setup;
+        ret=1;
+      }
+    }break;
+    default:{
+      /*We don't know what this header is.*/
+      return TH_EBADHEADER;
+    }break;
+  }
+  return ret;
+}
+
+
+/*Decodes one header packet.
+  This should be called repeatedly with the packets at the beginning of the
+   stream until it returns 0.*/
+int th_decode_headerin(th_info *_info,th_comment *_tc,
+ th_setup_info **_setup,ogg_packet *_op){
+  oc_pack_buf opb;
+  if(_op==NULL)return TH_EBADHEADER;
+  if(_info==NULL)return TH_EFAULT;
+  oc_pack_readinit(&opb,_op->packet,_op->bytes);
+  return oc_dec_headerin(&opb,_info,_tc,_setup,_op);
+}
+
+void th_setup_free(th_setup_info *_setup){
+  if(_setup!=NULL){
+    oc_setup_clear(_setup);
+    _ogg_free(_setup);
+  }
+}