docs: private List<GroupState> decode(byte[] bs, Charset charset) throws IOException {
          // 获取对象转换定义
          ObjectMetaData objectMetaData = FdfsParamMapper.getObjectMap(GroupState.class);
          int fixFieldsTotalSize = objectMetaData.getFieldsFixTotalSize();
          if (bs.length % fixFieldsTotalSize != 0) {
              throw new IOException("byte array length: " + bs.length + " is invalid!");
          }
          // 计算反馈对象数量
          int count = bs.length / fixFieldsTotalSize;
          int offset = 0;
          List<GroupState> results = new ArrayList<GroupState>(count);
  
          for (int i = 0; i < count; i++) {
              byte[] one = new byte[fixFieldsTotalSize];
              System.arraycopy(bs, offset, one, 0, fixFieldsTotalSize);
              results.add(FdfsParamMapper.map(one, GroupState.class, charset));
              offset += fixFieldsTotalSize;
          }
  
          return results;
      }