public ZlibBaseStream(System.IO.Stream stream,
CompressionMode compressionMode,
CompressionLevel level,
ZlibStreamFlavor flavor,
bool leaveOpen)
: base()
{
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();
}
}
// 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, System.IO.Stream stream, CRC32 crc32)
: base()
{
_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(System.IO.Stream stream, Int64 length, bool leaveOpen,
CRC32 crc32)
: this(leaveOpen, length, stream, crc32)
{
if (length < 0)
throw new ArgumentException("length");
}
/// <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 System.Collections.Generic.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;
}
private void _DeflateOne(Object wi)
{
// compress one buffer
WorkItem workitem = (WorkItem) wi;
try
{
int myItem = workitem.index;
CRC32 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 (System.Exception exc1)
{
lock(_eLock)
{
// expose the exception to the main thread
if (_pendingException!=null)
_pendingException = exc1;
}
}
}