/// <summary>
/// 构造函数
/// 用于从文件读入区块
/// </summary>
/// <param name="transmissionTask"></param>
/// <param name="blockIndex">分块位置</param>
/// <param name="readOnCreated">是否立即从文件读取数据</param>
public FileBlock(FileTransmission transmissionTask, int blockIndex, bool readOnCreated)
{
_fileStream = transmissionTask.FileStream;
Index = blockIndex;
if (readOnCreated)
{
Read(true);
}
}
/// <summary>
/// 构造函数
/// 用于从二进制数据读入区块
/// </summary>
/// <param name="transmissionTask"></param>
/// <param name="receivedData">输入的二进制数据</param>
public FileBlock(FileTransmission transmissionTask, byte[] receivedData)
{
_fileStream = transmissionTask.FileStream;
if (receivedData[0] != Consts.FileBlockHeader)
{
throw new FileBlockException("Bad Header!", FileBlockException.ErrorCode.BadHeader);
}
Index = BitConverter.ToInt32(receivedData, 1);
_dataLength = receivedData.Length - 9;
if (_dataLength > Consts.BlockSize)
{
throw new FileBlockException("Illegal FileBlock Size!", FileBlockException.ErrorCode.IllegalFileBlockSize);
}
_data = new byte[_dataLength];
_dataHash = new byte[4];
Array.Copy(receivedData, 5, _dataHash, 0, 4);
Array.Copy(receivedData, 9, _data, 0, _dataLength);
if (!_dataHash.BytesEqual(_data.GetHash()))
{
throw new FileBlockException("Error Hash!", FileBlockException.ErrorCode.ChecksumError);
}
}
public FileBlockCollection(FileTransmission transmissionTask)
{
Task = transmissionTask;
FileStream = Task.FileStream;
IoBufferSize = Consts.DefaultIoBufferSize;
}
public FileBlockCollection(FileTransmission transmissionTask)
{
Task = transmissionTask;
FileStream = Task.FileStream;
IoBufferSize = Consts.DefaultIoBufferSize;
}