docs: public static Set<MetaData> fromByte(byte[] content, Charset charset) {
          Set<MetaData> mdSet = new HashSet<MetaData>();
          if (null == content) {
              return mdSet;
          }
          String meta_buff = new String(content, charset);
          String[] rows = meta_buff.split(OtherConstants.FDFS_RECORD_SEPERATOR);
  
          for (int i = 0; i < rows.length; i++) {
              String[] cols = rows[i].split(OtherConstants.FDFS_FIELD_SEPERATOR, 2);
              MetaData md = new MetaData(cols[0]);
              if (cols.length == 2) {
                  md.setValue(cols[1]);
              }
              mdSet.add(md);
          }
  
          return mdSet;
      }