/// <summary>
/// read block of compressed data
/// </summary>
/// <param name="block">compressed data</param>
/// <returns>true if success</returns>
public bool ReadData(out Block block)
{
if (inputStream.BaseStream.Position != inputStream.BaseStream.Length)
{
try
{
block = BlockPool.GetBlock();
block.Number = inputStream.ReadInt32();
int blockSize = inputStream.ReadInt32();
block.Data = inputStream.ReadBytes(blockSize);
//if (block.Data.Length != blockSize) throw new Exception("data block length doesn't match");
return(true);
}
catch (Exception e)
{
throw e;
}
}
else
{
block = null;
return(false);
}
}
/// <summary>
/// write compressed data to stream
/// </summary>
/// <param name="data">compressed data</param>
public void WriteData(Block data)
{
lock (locker)
{
outputStream.Write(data.Number);
outputStream.Write(data.Data.Length);
outputStream.Write(data.Data);
}
BlockPool.ReturnObject(data);
}
/// <summary>
/// read original data from input stream
/// </summary>
/// <param name="block">data converted to block</param>
/// <returns>true if success</returns>
public bool ReadData(out Block block)
{
if (inputStream.BaseStream.Position != inputStream.BaseStream.Length)
{
block = BlockPool.GetBlock();
block.Data = inputStream.ReadBytes(blockSize);
block.Number = counter++;
return(true);
}
else
{
block = null;
return(false);
}
}
/// <summary>
/// writing decompressed data to file
/// </summary>
/// <param name="data">decompressed data</param>
public void WriteData(Block data)
{
lock (locker)
{
if (data.Number < position || dictToWrite.ContainsKey(data.Number))
{
throw new Exception($"Duplicate key to write {data.Number}");
}
dictToWrite.Add(data.Number, data.Data);
while (dictToWrite.ContainsKey(position))
{
outputStream.Write(dictToWrite[position]);
dictToWrite.Remove(position++);
}
BlockPool.ReturnObject(data);
}
}
