public ZlibBaseStream(Stream stream,
CompressionMode compressionMode,
CompressionLevel level,
ZlibStreamFlavor flavor,
bool leaveOpen)
{
this._flushMode = FlushType.None;
//this._workingBuffer = new byte[WORKING_BUFFER_SIZE_DEFAULT];
this._stream = stream;
this._leaveOpen = leaveOpen;
this._compressionMode = compressionMode;
this._flavor = flavor;
this._level = level;
// workitem 7159
if (flavor == ZlibStreamFlavor.GZIP) {
this.crc = new CRC32();
}
}
private void _DeflateOne(Object wi)
{
// compress one buffer
var workitem = (WorkItem)wi;
try {
int myItem = workitem.index;
var crc = new CRC32();
// calc CRC on the buffer
crc.SlurpBlock(workitem.buffer, 0, workitem.inputBytesAvailable);
// deflate it
DeflateOneSegment(workitem);
// update status
workitem.crc = crc.Crc32Result;
TraceOutput(TraceBits.Compress,
"Compress wi({0}) ord({1}) len({2})",
workitem.index,
workitem.ordinal,
workitem.compressedBytesAvailable
);
lock (_latestLock) {
if (workitem.ordinal > _latestCompressed) {
_latestCompressed = workitem.ordinal;
}
}
lock (_toWrite) {
_toWrite.Enqueue(workitem.index);
}
_newlyCompressedBlob.Set();
} catch (Exception exc1) {
lock (_eLock) {
// expose the exception to the main thread
if (_pendingException != null) {
_pendingException = exc1;
}
}
}
}
///<summary>
/// Resets the stream for use with another stream.
///</summary>
///<remarks>
/// Because the ParallelDeflateOutputStream is expensive to create, it has been designed so that it can be recycled and re-used. You have to call Close() on the stream first, then you can call Reset() on it, to use it again on another stream.
///</remarks>
///<param name="stream"> The new output stream for this era. </param>
///<example>
/// <code>ParallelDeflateOutputStream deflater = null;
/// foreach (var inputFile in listOfFiles)
/// {
/// string outputFile = inputFile + ".compressed";
/// using (System.IO.Stream input = System.IO.File.OpenRead(inputFile))
/// {
/// using (var outStream = System.IO.File.Create(outputFile))
/// {
/// if (deflater == null)
/// deflater = new ParallelDeflateOutputStream(outStream,
/// CompressionLevel.Best,
/// CompressionStrategy.Default,
/// true);
/// deflater.Reset(outStream);
///
/// while ((n= input.Read(buffer, 0, buffer.Length)) != 0)
/// {
/// deflater.Write(buffer, 0, n);
/// }
/// }
/// }
/// }</code>
///</example>
public void Reset(Stream stream)
{
TraceOutput(TraceBits.Session, "-------------------------------------------------------");
TraceOutput(TraceBits.Session, "Reset {0:X8} firstDone({1})", this.GetHashCode(), _firstWriteDone);
if (!_firstWriteDone) {
return;
}
// reset all status
_toWrite.Clear();
_toFill.Clear();
foreach (var workitem in _pool) {
_toFill.Enqueue(workitem.index);
workitem.ordinal = -1;
}
_firstWriteDone = false;
_totalBytesProcessed = 0L;
_runningCrc = new CRC32();
_isClosed = false;
_currentlyFilling = -1;
_lastFilled = -1;
_lastWritten = -1;
_latestCompressed = -1;
_outStream = stream;
}
private void _InitializePoolOfWorkItems()
{
_toWrite = new Queue<int>();
_toFill = new Queue<int>();
_pool = new List<WorkItem>();
int nTasks = BufferPairsPerCore*Environment.ProcessorCount;
nTasks = Math.Min(nTasks, _maxBufferPairs);
for (int i = 0; i < nTasks; i++) {
_pool.Add(new WorkItem(_bufferSize, _compressLevel, Strategy, i));
_toFill.Enqueue(i);
}
_newlyCompressedBlob = new AutoResetEvent(false);
_runningCrc = new CRC32();
_currentlyFilling = -1;
_lastFilled = -1;
_lastWritten = -1;
_latestCompressed = -1;
}
// This ctor is private - no validation is done here. This is to allow the use
// of a (specific) negative value for the _lengthLimit, to indicate that there
// is no length set. So we validate the length limit in those ctors that use an
// explicit param, otherwise we don't validate, because it could be our special
// value.
private CrcCalculatorStream
(bool leaveOpen, Int64 length, Stream stream, CRC32 crc32) {
_innerStream = stream;
_Crc32 = crc32 ?? new CRC32();
_lengthLimit = length;
_leaveOpen = leaveOpen;
}
/// <summary>
/// A constructor allowing the specification of the length of the stream to read, as well as whether to keep the underlying stream open upon Close(), and the CRC32 instance to use.
/// </summary>
/// <remarks>
/// <para>The stream uses the specified CRC32 instance, which allows the
/// application to specify how the CRC gets calculated.</para>
/// </remarks>
/// <param name="stream"> The underlying stream </param>
/// <param name="length"> The length of the stream to slurp </param>
/// <param name="leaveOpen"> true to leave the underlying stream open upon close of the <c>CrcCalculatorStream</c> ; false otherwise. </param>
/// <param name="crc32"> the CRC32 instance to use to calculate the CRC32 </param>
public CrcCalculatorStream(Stream stream, Int64 length, bool leaveOpen,
CRC32 crc32)
: this(leaveOpen, length, stream, crc32) {
if (length < 0) {
throw new ArgumentException("length");
}
}
