public override void Decompress()
{
initializePlan();
Thread processThread = new Thread(consumeCompressedFilePart);
Thread writeThread = new Thread(writeDecompressedParts);
try {
using (FileStream reader = new FileStream(m_inputFile, FileMode.Open, FileAccess.Read, FileShare.None, c_blockSize)) {
processThread.Start();
writeThread.Start();
// Skip custom seporator
var customSeporatorBytes = CustomBlockSeporator.GetSeporatorBytes();
reader.Seek(customSeporatorBytes.LongLength, SeekOrigin.Begin);
// Get the whole block count
var wholeBlockCountBytes = new byte[sizeof(long)];
var wholeBlockCountBytesFetched = reader.Read(wholeBlockCountBytes, 0, wholeBlockCountBytes.Length);
if (wholeBlockCountBytesFetched != sizeof(long))
{
throw new Exception("Invalid file header");
}
m_fileBlocksCount = BitConverter.ToInt64(wholeBlockCountBytes, 0);
// Read until file doesnt end
long blockIndex = 0;
int readBytes = 0;
do
{
// Read block header - block length
byte[] blockHeader = new byte[sizeof(int)];
int blockHeaderLength = reader.Read(blockHeader, 0, sizeof(int));
if (blockHeaderLength == 0)
{
break;
}
if (blockHeaderLength != sizeof(int))
{
throw new InvalidOperationException("Invalid chunk header");
}
// Check the length of the following block payload is it the same with previous readed
int blockSize = BitConverter.ToInt32(blockHeader, 0);
byte[] block = new byte[blockSize];
readBytes = reader.Read(block, 0, blockSize);
if (readBytes <= 0)
{
break;
}
FilePart filePart = new FilePart(block, blockIndex);
m_rawBlockQueue.Enqueue(filePart);
blockIndex++;
}while (readBytes > 0);
}
writeThread.Join();
} catch (Exception ex) {
throw new Exception("Error was occured in decompress method");
}
}
private void writeCustomHeader(FileStream fileStream)
{
var header = CustomBlockSeporator.GetSeporatorBytes();
fileStream.Write(header, 0, header.Length);
var blocksCountBytes = BitConverter.GetBytes(m_fileBlocksCount);
fileStream.Write(blocksCountBytes, 0, blocksCountBytes.Length);
}
