Method requireBytes

lib/src/device/BlockDeviceInputStream.cpp:191–213

   */

  int16_t BlockDeviceInputStream::requireBytes() {

    // if the index has hit the end, advance to new block

    if(_indexInBlock==_device.getBlockSizeInBytes()) {

      _indexInBlock=0;
      _blockIndex++;

      // check for end of the device

      if(_blockIndex==_device.getTotalBlocksOnDevice())
        return E_END_OF_STREAM;
    }

    // if we're at position zero then new bytes must be read in

    if(_indexInBlock==0)
      if(!_device.readBlock(_block,_blockIndex))
        return E_STREAM_ERROR;

    return ErrorProvider::ERROR_NO_ERROR;
  }
}