456 static int op_is_jpeg(const unsigned char *_buf,size_t _buf_sz){  in op_is_jpeg()  argument
457   return _buf_sz>=11&&memcmp(_buf,"\xFF\xD8\xFF\xE0",4)==0  in op_is_jpeg()
464 static void op_extract_jpeg_params(const unsigned char *_buf,size_t _buf_sz,  in op_extract_jpeg_params()  argument
467   if(op_is_jpeg(_buf,_buf_sz)){  in op_extract_jpeg_params()
473       while(offs<_buf_sz&&_buf[offs]!=0xFF)offs++;  in op_extract_jpeg_params()
474       while(offs<_buf_sz&&_buf[offs]==0xFF)offs++;  in op_extract_jpeg_params()
479       if(offs>=_buf_sz||(marker>=0xD8&&marker<=0xDA))break;  in op_extract_jpeg_params()
483       if(_buf_sz-offs<2)break;  in op_extract_jpeg_params()
485       if(segment_len<2||_buf_sz-offs<segment_len)break;  in op_extract_jpeg_params()
503 static int op_is_png(const unsigned char *_buf,size_t _buf_sz){  in op_is_png()  argument
504   return _buf_sz>=8&&memcmp(_buf,"\x89PNG\x0D\x0A\x1A\x0A",8)==0;  in op_is_png()
510 static void op_extract_png_params(const unsigned char *_buf,size_t _buf_sz,  in op_extract_png_params()  argument
513   if(op_is_png(_buf,_buf_sz)){  in op_extract_png_params()
516     while(_buf_sz-offs>=12){  in op_extract_png_params()
519       if(chunk_len>_buf_sz-(offs+12))break;  in op_extract_png_params()
550 static int op_is_gif(const unsigned char *_buf,size_t _buf_sz){  in op_is_gif()  argument
551   return _buf_sz>=6&&(memcmp(_buf,"GIF87a",6)==0||memcmp(_buf,"GIF89a",6)==0);  in op_is_gif()
557 static void op_extract_gif_params(const unsigned char *_buf,size_t _buf_sz,  in op_extract_gif_params()  argument
560   if(op_is_gif(_buf,_buf_sz)&&_buf_sz>=14){  in op_extract_gif_params()
575  unsigned char *_buf,size_t _buf_sz,size_t _base64_sz){  in opus_picture_tag_parse_impl()  argument
608       else if(c=='='&&3*i+j>_buf_sz)d=0;  in opus_picture_tag_parse_impl()
613     if(3*i+1<_buf_sz){  in opus_picture_tag_parse_impl()
615       if(3*i+2<_buf_sz)_buf[3*i+2]=(unsigned char)value;  in opus_picture_tag_parse_impl()
624   if(mime_type_length>_buf_sz-32)return OP_ENOTFORMAT;  in opus_picture_tag_parse_impl()
634   if(description_length>_buf_sz-mime_type_length-32)return OP_ENOTFORMAT;  in opus_picture_tag_parse_impl()
656   if(data_length>_buf_sz-i)return OP_ENOTFORMAT;  in opus_picture_tag_parse_impl()
658   _buf_sz=i+data_length;  in opus_picture_tag_parse_impl()
668     _buf[_buf_sz++]='\0';  in opus_picture_tag_parse_impl()
720   _buf_sz-=i;  in opus_picture_tag_parse_impl()
721   memmove(_buf,_buf+i,sizeof(*_buf)*_buf_sz);  in opus_picture_tag_parse_impl()
722   _buf=(unsigned char *)_ogg_realloc(_buf,_buf_sz);  in opus_picture_tag_parse_impl()
723   if(_buf_sz>0&&_buf==NULL)return OP_EFAULT;  in opus_picture_tag_parse_impl()