/// <summary>
/// 读取或写入区块
/// </summary>
/// <param name="blockIndex">区块序号</param>
public FileBlock this[int blockIndex]
{
get
{
FileBlock output;
if (EnabledIoBuffer)
{
bool isInBuf;
lock (IoBuffer)
isInBuf = IoBuffer.TryGetValue(blockIndex, out output);
if (isInBuf)
{
return(output);
}
output = new FileBlock(Task, blockIndex, true);
BeginFillIoBuffer(blockIndex + 1, null, null);
}
else
{
output = new FileBlock(Task, blockIndex, true);
}
return(output);
}
set
{
if (blockIndex != value.Index)
{
throw new FileBlockException("Bad Index!", FileBlockException.ErrorCode.BadIndex);
}
Write(value);
}
}
/// <summary>
/// 校验文件
/// </summary>
/// <returns>损坏或尚未下载的区块序号列表</returns>
public List <int> HashFile()
{
FileStream.Position = 0;
ExistBlock.Clear();
for (int count = 0; FileStream.Position < FileStream.Length && count < TotalBlock; count++)
{
//校验已存在的区块
var testBlock = new FileBlock(this, count, true);
SendString(string.Format("GET BlockHash {0}", count));
string[] msg = ReceiveString().Split(' ');
if (msg[0] == "BlockHash")
{
if (Convert.ToInt32(msg[1]) == count)
{
if (BitConverter.ToInt32(testBlock.DataHash, 0) == Convert.ToInt32(msg[2]))
{
ExistBlock.Add(count);
}
}
}
if (BlockHashed != null)
{
BlockHashed(this, new BlockFinishedEventArgs(count));
}
}
int maxExistBlockIndex; //已存在的区块最大序号
try
{
maxExistBlockIndex = ExistBlock.Max();
}
catch
{
maxExistBlockIndex = 0;
}
var blockRemaining = new List <int>();
for (int index = 0; index < TotalBlock;)
{
//计算仍需传输的区块
if (index <= maxExistBlockIndex)
{
if (ExistBlock.Exists(a => a == index))
{
index++;
continue;
}
}
blockRemaining.Add(index++);
}
return(blockRemaining);
}
/// <summary>
/// 写入区块
/// </summary>
/// <param name="value">区块对象</param>
public void Write(FileBlock value)
{
if (EnabledIoBuffer)
{
if (IoBuffer.Count >= IoBufferSize)
{
WriteAllBlock();
}
lock (IoBuffer)
IoBuffer.Add(value.Index, value);
}
else
{
value.Write();
}
}
