mdict-parser.js
function findResource(keyinfo) {
      var block = RECORD_BLOCK_TABLE.find(keyinfo.offset);
      return _slice(block.comp_offset, block.comp_size)
                .exec(read_object, block, keyinfo)
                  .spread(function (blob) { return resolve(blob); });
    }
function findResource(keyinfo) {
      var block = RECORD_BLOCK_TABLE.find(keyinfo.offset);
      return _slice(block.comp_offset, block.comp_size)
                .exec(read_object, block, keyinfo)
                  .spread(function (blob) { return resolve(blob); });
    }
Find resource (image, sound etc.) for given keyinfo object.
@param keyinfo a object with property of record's offset and optional size for the given keyword
@return a promise object which will resolve to an ArrayBuffer containing resource of image/audio/css/font etc.
TODO: Follow link, maybe it's too expensive and a rarely used feature?