| public Deflate ( FlushType flush ) : int | ||
| flush | FlushType | whether to flush all data as you deflate. Generally you will want to /// use Z_NO_FLUSH here, in a series of calls to Deflate(), and then call EndDeflate() to /// flush everything. /// |
| Résultat | int | |
public override void Write(System.Byte[] buffer, int offset, int count)
{
// workitem 7159
// calculate the CRC on the unccompressed data (before writing)
if (crc != null)
{
crc.SlurpBlock(buffer, offset, count);
}
if (_streamMode == StreamMode.Undefined)
{
_streamMode = StreamMode.Writer;
}
else if (_streamMode != StreamMode.Writer)
{
throw new ZlibException("Cannot Write after Reading.");
}
if (count == 0)
{
return;
}
// first reference of z property will initialize the private var _z
z.InputBuffer = buffer;
_z.NextIn = offset;
_z.AvailableBytesIn = count;
bool done = false;
do
{
_z.OutputBuffer = workingBuffer;
_z.NextOut = 0;
_z.AvailableBytesOut = _workingBuffer.Length;
int rc = (_wantCompress)
? _z.Deflate(_flushMode)
: _z.Inflate(_flushMode);
if (rc != ZlibConstants.Z_OK && rc != ZlibConstants.Z_STREAM_END)
{
throw new ZlibException((_wantCompress ? "de" : "in") + "flating: " + _z.Message);
}
//if (_workingBuffer.Length - _z.AvailableBytesOut > 0)
_stream.Write(_workingBuffer, 0, _workingBuffer.Length - _z.AvailableBytesOut);
done = _z.AvailableBytesIn == 0 && _z.AvailableBytesOut != 0;
// If GZIP and de-compress, we're done when 8 bytes remain.
if (_flavor == ZlibStreamFlavor.GZIP && !_wantCompress)
{
done = (_z.AvailableBytesIn == 8 && _z.AvailableBytesOut != 0);
}
}while (!done);
}
private void _FlushFinish()
{
byte[] buffer = new byte[128];
ZlibCodec zlibCodec = new ZlibCodec();
zlibCodec.InitializeDeflate(this._compressLevel, false);
zlibCodec.InputBuffer = (byte[])null;
zlibCodec.NextIn = 0;
zlibCodec.AvailableBytesIn = 0;
zlibCodec.OutputBuffer = buffer;
zlibCodec.NextOut = 0;
zlibCodec.AvailableBytesOut = buffer.Length;
int num = zlibCodec.Deflate(FlushType.Finish);
if (num != 1 && num != 0)
{
throw new Exception("deflating: " + zlibCodec.Message);
}
if (buffer.Length - zlibCodec.AvailableBytesOut > 0)
{
this._outStream.Write(buffer, 0, buffer.Length - zlibCodec.AvailableBytesOut);
}
zlibCodec.EndDeflate();
this._Crc32 = this._runningCrc.Crc32Result;
}
public override void Write(byte[] buffer, int offset, int count)
{
if (crc != null)
{
crc.SlurpBlock(buffer, offset, count);
}
if (_streamMode == StreamMode.Undefined)
{
_streamMode = StreamMode.Writer;
}
else if (_streamMode != 0)
{
throw new ZlibException("Cannot Write after Reading.");
}
if (count == 0)
{
return;
}
z.InputBuffer = buffer;
_z.NextIn = offset;
_z.AvailableBytesIn = count;
bool flag = false;
while (true)
{
_z.OutputBuffer = workingBuffer;
_z.NextOut = 0;
_z.AvailableBytesOut = _workingBuffer.Length;
int num = _wantCompress ? _z.Deflate(_flushMode) : _z.Inflate(_flushMode);
if (num != 0 && num != 1)
{
break;
}
_stream.Write(_workingBuffer, 0, _workingBuffer.Length - _z.AvailableBytesOut);
flag = (_z.AvailableBytesIn == 0 && _z.AvailableBytesOut != 0);
if (_flavor == ZlibStreamFlavor.GZIP && !_wantCompress)
{
flag = (_z.AvailableBytesIn == 8 && _z.AvailableBytesOut != 0);
}
if (flag)
{
return;
}
}
throw new ZlibException((_wantCompress ? "de" : "in") + "flating: " + _z.Message);
}
private bool DeflateOneSegment(WorkItem workitem)
{
ZlibCodec compressor = workitem.compressor;
compressor.ResetDeflate();
compressor.NextIn = 0;
compressor.AvailableBytesIn = workitem.inputBytesAvailable;
compressor.NextOut = 0;
compressor.AvailableBytesOut = workitem.compressed.Length;
do
{
compressor.Deflate(FlushType.None);
}while (compressor.AvailableBytesIn > 0 || compressor.AvailableBytesOut == 0);
compressor.Deflate(FlushType.Sync);
workitem.compressedBytesAvailable = (int)compressor.TotalBytesOut;
return(true);
}
private bool DeflateOneSegment(WorkItem workitem)
{
ZlibCodec zlibCodec = workitem.compressor;
int num = 0;
zlibCodec.ResetDeflate();
zlibCodec.NextIn = 0;
zlibCodec.AvailableBytesIn = workitem.inputBytesAvailable;
zlibCodec.NextOut = 0;
zlibCodec.AvailableBytesOut = workitem.compressed.Length;
do
{
zlibCodec.Deflate(FlushType.None);
}while (zlibCodec.AvailableBytesIn > 0 || zlibCodec.AvailableBytesOut == 0);
num = zlibCodec.Deflate(FlushType.Sync);
workitem.compressedBytesAvailable = (int)zlibCodec.TotalBytesOut;
return(true);
}
public override void Write(byte[] buffer, int offset, int count)
{
if (_streamMode == StreamMode.Undefined)
{
_streamMode = StreamMode.Writer;
}
else if (_streamMode != StreamMode.Writer)
{
throw new ZlibException("Cannot Write after Reading.");
}
if (count == 0)
{
return;
}
// first reference of z property will initialize the private var _z
z.InputBuffer = buffer;
_z.NextIn = offset;
_z.AvailableBytesIn = count;
var done = false;
do
{
_z.OutputBuffer = workingBuffer;
_z.NextOut = 0;
_z.AvailableBytesOut = _workingBuffer.Length;
var rc = _wantCompress
? _z.Deflate(_flushMode)
: _z.Inflate(_flushMode);
if (rc != ZlibConstants.Z_OK && rc != ZlibConstants.Z_STREAM_END)
{
throw new ZlibException((_wantCompress ? "de" : "in") + "flating: " + _z.Message);
}
//if (_workingBuffer.Length - _z.AvailableBytesOut > 0)
_stream.Write(_workingBuffer, 0, _workingBuffer.Length - _z.AvailableBytesOut);
done = _z.AvailableBytesIn == 0 && _z.AvailableBytesOut != 0;
} while (!done);
}
int HandleCompression(byte[] buffer, int count)
{
_compressor.InputBuffer = buffer;
_compressor.NextOut = 0;
_compressor.NextIn = 0;
_compressor.AvailableBytesIn = count;
while (true)
{
_compressor.OutputBuffer = _compressionBuffer;
_compressor.AvailableBytesOut = _compressionBuffer.Length - _compressor.NextOut;
var rc = _compressor.Deflate(Ionic.Zlib.FlushType.None);
if (rc != Ionic.Zlib.ZlibConstants.Z_OK)
{
throw new IOException($"Error '{rc}' while compressing the data.");
}
if (_compressor.AvailableBytesIn > 0 || _compressor.AvailableBytesOut == 0)
{
ResizeBuffer(ref _compressionBuffer);
continue;
}
break;
}
while (true)
{
_compressor.OutputBuffer = _compressionBuffer;
_compressor.AvailableBytesOut = _compressionBuffer.Length - _compressor.NextOut;
var rc = _compressor.Deflate(Ionic.Zlib.FlushType.Sync);
if (rc != Ionic.Zlib.ZlibConstants.Z_OK)
{
throw new IOException($"Error '{rc}' while compressing the data.");
}
if (_compressor.AvailableBytesIn > 0 || _compressor.AvailableBytesOut == 0)
{
ResizeBuffer(ref _compressionBuffer);
continue;
}
break;
}
return(_compressor.NextOut);
}
private static int DeflateOneSegment(WorkItem workitem)
{
ZlibCodec compressor = workitem.compressor;
compressor.ResetDeflate();
compressor.NextIn = 0;
compressor.AvailableBytesIn = workitem.inputBytesAvailable;
// step 1: deflate the buffer
compressor.NextOut = 0;
compressor.AvailableBytesOut = workitem.compressed.Length;
do
{
compressor.Deflate(FlushType.None);
}while (compressor.AvailableBytesIn > 0 || compressor.AvailableBytesOut == 0);
// step 2: flush (sync)
int rc = compressor.Deflate(FlushType.Sync);
workitem.compressedBytesAvailable = (int)compressor.TotalBytesOut;
return(rc);
}
/// <summary>
/// Compress the specified inputData.
/// </summary>
/// <param name="inputData">Input data.</param>
/// <returns>compressed byte array</returns>
public static byte[] Compress(byte[] inputData)
{
var zlib = new ZlibCodec(Ionic.Zlib.CompressionMode.Compress);
zlib.CompressLevel = Ionic.Zlib.CompressionLevel.BestCompression;
zlib.InputBuffer = inputData;
zlib.OutputBuffer = new byte[MAX_PACKET_SIZE];
zlib.NextIn = 0;
zlib.AvailableBytesIn = inputData.Length;
zlib.NextOut = 0;
zlib.AvailableBytesOut = MAX_PACKET_SIZE;
zlib.Deflate(FlushType.Finish);
var output = new byte[zlib.TotalBytesOut];
Array.Copy(zlib.OutputBuffer, output, (int)zlib.TotalBytesOut);
return output;
}
public override void Flush()
{
CheckDisposed();
var ms = (MemoryStream)_outputWriter.BaseStream;
var buffer = ms.ToArraySegment();
try
{
if (_compression)
{
if (_deflate == null)
{
_deflate = new Ionic.Zlib.ZlibCodec(Ionic.Zlib.CompressionMode.Compress);
}
if (_compressionBuffer == null)
{
_compressionBuffer = new byte[1024 * 1024];
}
_deflate.OutputBuffer = _compressionBuffer;
_deflate.AvailableBytesOut = _compressionBuffer.Length;
_deflate.NextOut = 0;
_deflate.InputBuffer = buffer.Array;
_deflate.AvailableBytesIn = buffer.Count;
_deflate.NextIn = 0;
var rc = _deflate.Deflate(Ionic.Zlib.FlushType.Sync);
if (rc != Ionic.Zlib.ZlibConstants.Z_OK)
{
throw new IOException($"Error '{rc}' while compressing the data.");
}
if (_deflate.AvailableBytesIn != 0)
{
throw new IOException("Compression buffer too small.");
}
buffer = new ArraySegment <byte>(_compressionBuffer, 0, _deflate.NextOut);
}
_innerStream.Write(buffer.Array, buffer.Offset, buffer.Count);
_innerStream.Flush();
_inputReader.BaseStream.Flush();
}
finally
{
_outputWriter.BaseStream.SetLength(0);
}
}
internal int SetParams(CompressionLevel level, CompressionStrategy strategy)
{
int result = 0;
if (compressionLevel != level)
{
Config config = Config.Lookup(level);
if (config.Flavor != this.config.Flavor && _codec.TotalBytesIn != 0L)
{
result = _codec.Deflate(FlushType.Partial);
}
compressionLevel = level;
this.config = config;
SetDeflater();
}
compressionStrategy = strategy;
return(result);
}
private static byte[] ZlibCodecCompress(string textToCompress)
{
int outputSize = 2048;
byte[] output = new Byte[outputSize];
byte[] uncompressed = UTF8Encoding.UTF8.GetBytes(textToCompress);
int lengthToCompress = uncompressed.Length;
// If you want a ZLIB stream, set this to true. If you want
// a bare DEFLATE stream, set this to false.
bool wantRfc1950Header = false;
using (MemoryStream ms = new MemoryStream())
{
ZlibCodec compressor = new ZlibCodec();
compressor.InitializeDeflate(CompressionLevel.BestCompression, wantRfc1950Header);
compressor.InputBuffer = uncompressed;
compressor.AvailableBytesIn = lengthToCompress;
compressor.NextIn = 0;
compressor.OutputBuffer = output;
foreach (var f in new FlushType[] { FlushType.None, FlushType.Finish })
{
int bytesToWrite = 0;
do
{
compressor.AvailableBytesOut = outputSize;
compressor.NextOut = 0;
compressor.Deflate(f);
bytesToWrite = outputSize - compressor.AvailableBytesOut;
if (bytesToWrite > 0)
ms.Write(output, 0, bytesToWrite);
}
while ((f == FlushType.None && (compressor.AvailableBytesIn != 0 || compressor.AvailableBytesOut == 0)) ||
(f == FlushType.Finish && bytesToWrite != 0));
}
compressor.EndDeflate();
ms.Flush();
return ms.ToArray();
}
}
private void _FlushFinish()
{
// After writing a series of compressed buffers, each one closed
// with Flush.Sync, we now write the final one as Flush.Finish,
// and then stop.
byte[] buffer = new byte[128];
var compressor = new ZlibCodec();
int rc = compressor.InitializeDeflate(_compressLevel, false);
compressor.InputBuffer = null;
compressor.NextIn = 0;
compressor.AvailableBytesIn = 0;
compressor.OutputBuffer = buffer;
compressor.NextOut = 0;
compressor.AvailableBytesOut = buffer.Length;
rc = compressor.Deflate(FlushType.Finish);
if (rc != ZlibConstants.Z_STREAM_END && rc != ZlibConstants.Z_OK)
{
throw new Exception("deflating: " + compressor.Message);
}
if (buffer.Length - compressor.AvailableBytesOut > 0)
{
TraceOutput(TraceBits.EmitBegin,
"Emit begin flush bytes({0})",
buffer.Length - compressor.AvailableBytesOut);
_outStream.Write(buffer, 0, buffer.Length - compressor.AvailableBytesOut);
TraceOutput(TraceBits.EmitDone,
"Emit done flush");
}
compressor.EndDeflate();
_Crc32 = _runningCrc.Crc32Result;
}
private void _FlushFinish()
{
byte[] array = new byte[128];
ZlibCodec zlibCodec = new ZlibCodec();
int num = zlibCodec.InitializeDeflate(_compressLevel, wantRfc1950Header: false);
zlibCodec.InputBuffer = null;
zlibCodec.NextIn = 0;
zlibCodec.AvailableBytesIn = 0;
zlibCodec.OutputBuffer = array;
zlibCodec.NextOut = 0;
zlibCodec.AvailableBytesOut = array.Length;
num = zlibCodec.Deflate(FlushType.Finish);
if (num != 1 && num != 0)
{
throw new Exception("deflating: " + zlibCodec.Message);
}
if (array.Length - zlibCodec.AvailableBytesOut > 0)
{
_outStream.Write(array, 0, array.Length - zlibCodec.AvailableBytesOut);
}
zlibCodec.EndDeflate();
_Crc32 = _runningCrc.Crc32Result;
}
public void Zlib_TestFlushSync()
{
int rc;
int bufferSize = 40000;
byte[] CompressedBytes = new byte[bufferSize];
byte[] DecompressedBytes = new byte[bufferSize];
string TextToCompress = "This is the text that will be compressed.";
byte[] BytesToCompress = System.Text.ASCIIEncoding.ASCII.GetBytes(TextToCompress);
ZlibCodec compressor = new ZlibCodec(CompressionMode.Compress);
compressor.InputBuffer = BytesToCompress;
compressor.NextIn = 0;
compressor.AvailableBytesIn = 3;
compressor.OutputBuffer = CompressedBytes;
compressor.NextOut = 0;
compressor.AvailableBytesOut = CompressedBytes.Length;
rc = compressor.Deflate(FlushType.Full);
CompressedBytes[3]++; // force an error in first compressed block // dinoch - ??
compressor.AvailableBytesIn = TextToCompress.Length - 3;
rc = compressor.Deflate(FlushType.Finish);
Assert.AreEqual<int>(ZlibConstants.Z_STREAM_END, rc, String.Format("at Deflate() [{0}]", compressor.Message));
rc = compressor.EndDeflate();
bufferSize = (int)(compressor.TotalBytesOut);
ZlibCodec decompressor = new ZlibCodec(CompressionMode.Decompress);
decompressor.InputBuffer = CompressedBytes;
decompressor.NextIn = 0;
decompressor.AvailableBytesIn = 2;
decompressor.OutputBuffer = DecompressedBytes;
decompressor.NextOut = 0;
decompressor.AvailableBytesOut = DecompressedBytes.Length;
rc = decompressor.Inflate(FlushType.None);
decompressor.AvailableBytesIn = bufferSize - 2;
rc = decompressor.SyncInflate();
bool gotException = false;
try
{
rc = decompressor.Inflate(FlushType.Finish);
}
catch (ZlibException ex1)
{
TestContext.WriteLine("Got Expected Exception: " + ex1);
gotException = true;
}
Assert.IsTrue(gotException, "inflate should report DATA_ERROR");
rc = decompressor.EndInflate();
Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at EndInflate() [{0}]", decompressor.Message));
int j = 0;
for (; j < DecompressedBytes.Length; j++)
if (DecompressedBytes[j] == 0)
break;
var result = System.Text.ASCIIEncoding.ASCII.GetString(DecompressedBytes, 0, j);
Assert.AreEqual<int>(TextToCompress.Length, result.Length + 3, "Strings are unequal lengths");
Console.WriteLine("orig length: {0}", TextToCompress.Length);
Console.WriteLine("compressed length: {0}", compressor.TotalBytesOut);
Console.WriteLine("uncompressed length: {0}", decompressor.TotalBytesOut);
Console.WriteLine("result length: {0}", result.Length);
Console.WriteLine("result of inflate:\n(Thi){0}", result);
}
private static ZlibCodec deflate(byte[] buffer, int nMaxInflateBuffer)
{
var deflater = new ZlibCodec(CompressionMode.Compress);
deflater.InitializeDeflate(CompressionLevel.BestCompression);
deflater.InputBuffer = buffer;
deflater.AvailableBytesIn = buffer.Length;
deflater.NextIn = 0;
//deflater.setInput(buffer, 0, length, false);
int nMaxDeflateBuffer = nMaxInflateBuffer + 1024;
var deBuffer = new byte[nMaxDeflateBuffer];
deflater.OutputBuffer = deBuffer;
deflater.AvailableBytesOut = deBuffer.Length;
deflater.NextOut = 0;
int nResult = deflater.Deflate(FlushType.Finish);
checkResultStatus(nResult);
if (deflater.TotalBytesOut > nMaxDeflateBuffer)
{
throw new Exception("deflater output buffer was too small");
}
return deflater;
}
private void _PerpetualWriterMethod(object state)
{
TraceOutput(TraceBits.WriterThread, "_PerpetualWriterMethod START");
try
{
do
{
// wait for the next session
TraceOutput(TraceBits.Synch | TraceBits.WriterThread, "Synch _sessionReset.WaitOne(begin) PWM");
_sessionReset.WaitOne();
TraceOutput(TraceBits.Synch | TraceBits.WriterThread, "Synch _sessionReset.WaitOne(done) PWM");
if (_isDisposed)
{
break;
}
TraceOutput(TraceBits.Synch | TraceBits.WriterThread, "Synch _sessionReset.Reset() PWM");
_sessionReset.Reset();
// repeatedly write buffers as they become ready
WorkItem workitem = null;
Ionic.Zlib.CRC32 c = new Ionic.Zlib.CRC32();
do
{
workitem = _pool[_nextToWrite % _pc];
lock (workitem)
{
if (_noMoreInputForThisSegment)
{
TraceOutput(TraceBits.Write,
"Write drain wi({0}) stat({1}) canuse({2}) cba({3})",
workitem.index,
workitem.status,
(workitem.status == (int)WorkItem.Status.Compressed),
workitem.compressedBytesAvailable);
}
do
{
if (workitem.status == (int)WorkItem.Status.Compressed)
{
TraceOutput(TraceBits.WriteBegin,
"Write begin wi({0}) stat({1}) cba({2})",
workitem.index,
workitem.status,
workitem.compressedBytesAvailable);
workitem.status = (int)WorkItem.Status.Writing;
_outStream.Write(workitem.compressed, 0, workitem.compressedBytesAvailable);
c.Combine(workitem.crc, workitem.inputBytesAvailable);
_totalBytesProcessed += workitem.inputBytesAvailable;
_nextToWrite++;
workitem.inputBytesAvailable = 0;
workitem.status = (int)WorkItem.Status.Done;
TraceOutput(TraceBits.WriteDone,
"Write done wi({0}) stat({1}) cba({2})",
workitem.index,
workitem.status,
workitem.compressedBytesAvailable);
Monitor.Pulse(workitem);
break;
}
else
{
int wcycles = 0;
// I've locked a workitem I cannot use.
// Therefore, wake someone else up, and then release the lock.
while (workitem.status != (int)WorkItem.Status.Compressed)
{
TraceOutput(TraceBits.WriteWait,
"Write waiting wi({0}) stat({1}) nw({2}) nf({3}) nomore({4})",
workitem.index,
workitem.status,
_nextToWrite, _nextToFill,
_noMoreInputForThisSegment);
if (_noMoreInputForThisSegment && _nextToWrite == _nextToFill)
{
break;
}
wcycles++;
// wake up someone else
Monitor.Pulse(workitem);
// release and wait
Monitor.Wait(workitem);
if (workitem.status == (int)WorkItem.Status.Compressed)
{
TraceOutput(TraceBits.WriteWait,
"Write A-OK wi({0}) stat({1}) iba({2}) cba({3}) cyc({4})",
workitem.index,
workitem.status,
workitem.inputBytesAvailable,
workitem.compressedBytesAvailable,
wcycles);
}
}
if (_noMoreInputForThisSegment && _nextToWrite == _nextToFill)
{
break;
}
}
}while (true);
}
if (_noMoreInputForThisSegment)
{
TraceOutput(TraceBits.Write,
"Write nomore nw({0}) nf({1}) break({2})",
_nextToWrite, _nextToFill, (_nextToWrite == _nextToFill));
}
if (_noMoreInputForThisSegment && _nextToWrite == _nextToFill)
{
break;
}
} while (true);
// Finish:
// After writing a series of buffers, closing each one with
// Flush.Sync, we now write the final one as Flush.Finish, and
// then stop.
byte[] buffer = new byte[128];
ZlibCodec compressor = new ZlibCodec();
int rc = compressor.InitializeDeflate(_compressLevel, false);
compressor.InputBuffer = null;
compressor.NextIn = 0;
compressor.AvailableBytesIn = 0;
compressor.OutputBuffer = buffer;
compressor.NextOut = 0;
compressor.AvailableBytesOut = buffer.Length;
rc = compressor.Deflate(FlushType.Finish);
if (rc != ZlibConstants.Z_STREAM_END && rc != ZlibConstants.Z_OK)
{
throw new Exception("deflating: " + compressor.Message);
}
if (buffer.Length - compressor.AvailableBytesOut > 0)
{
TraceOutput(TraceBits.WriteBegin,
"Write begin flush bytes({0})",
buffer.Length - compressor.AvailableBytesOut);
_outStream.Write(buffer, 0, buffer.Length - compressor.AvailableBytesOut);
TraceOutput(TraceBits.WriteBegin,
"Write done flush");
}
compressor.EndDeflate();
_Crc32 = c.Crc32Result;
// signal that writing is complete:
TraceOutput(TraceBits.Synch, "Synch _writingDone.Set() PWM");
_writingDone.Set();
}while (true);
}
catch (System.Exception exc1)
{
lock (_eLock)
{
// expose the exception to the main thread
if (_pendingException != null)
{
_pendingException = exc1;
}
}
}
TraceOutput(TraceBits.WriterThread, "_PerpetualWriterMethod FINIS");
}
private void Run()
{
int rc;
int j;
int bufferSize = 40000;
byte[] compressedBytes = new byte[bufferSize];
byte[] bufferToCompress= new byte[bufferSize];
byte[] decompressedBytes = new byte[bufferSize];
ZlibCodec compressingStream= new ZlibCodec();
rc = compressingStream.InitializeDeflate(CompressionLevel.BestSpeed);
CheckForError(compressingStream, rc, "InitializeDeflate");
compressingStream.OutputBuffer = compressedBytes;
compressingStream.NextOut = 0;
compressingStream.AvailableBytesOut = compressedBytes.Length;
// At this point, bufferToCompress is all zeroes, so it should compress
// very well:
compressingStream.InputBuffer = bufferToCompress;
compressingStream.AvailableBytesIn = bufferToCompress.Length;
rc = compressingStream.Deflate(FlushType.None);
CheckForError(compressingStream, rc, "deflate");
if (compressingStream.AvailableBytesIn != 0)
{
System.Console.Out.WriteLine("deflate not greedy");
System.Environment.Exit(1);
}
Console.WriteLine("Stage 1: uncompressed bytes in so far: {0,6}", compressingStream.TotalBytesIn);
Console.WriteLine(" compressed bytes out so far: {0,6}", compressingStream.TotalBytesOut);
// Feed in already compressed data and switch to no compression:
compressingStream.SetDeflateParams(CompressionLevel.None, CompressionStrategy.Default);
compressingStream.InputBuffer = compressedBytes;
compressingStream.NextIn = 0;
compressingStream.AvailableBytesIn = bufferSize / 2; // why? - for fun
rc = compressingStream.Deflate(FlushType.None);
CheckForError(compressingStream, rc, "Deflate");
Console.WriteLine("Stage 2: uncompressed bytes in so far: {0,6}", compressingStream.TotalBytesIn);
Console.WriteLine(" compressed bytes out so far: {0,6}", compressingStream.TotalBytesOut);
// Insert data into bufferToCompress, and Switch back to compressing mode:
System.Random rnd = new Random();
for (int i = 0; i < bufferToCompress.Length / 1000; i++)
{
byte b = (byte) rnd.Next();
int n = 500 + rnd.Next(500);
for (j = 0; j < n; j++)
bufferToCompress[j + i] = b;
i += j-1;
}
compressingStream.SetDeflateParams(CompressionLevel.BestCompression, CompressionStrategy.Filtered);
compressingStream.InputBuffer = bufferToCompress;
compressingStream.NextIn = 0;
compressingStream.AvailableBytesIn = bufferToCompress.Length;
rc = compressingStream.Deflate(FlushType.None);
CheckForError(compressingStream, rc, "Deflate");
Console.WriteLine("Stage 3: uncompressed bytes in so far: {0,6}", compressingStream.TotalBytesIn);
Console.WriteLine(" compressed bytes out so far: {0,6}", compressingStream.TotalBytesOut);
rc = compressingStream.Deflate(FlushType.Finish);
if (rc != ZlibConstants.Z_STREAM_END)
{
Console.WriteLine("deflate reported {0}, should report Z_STREAM_END", rc);
Environment.Exit(1);
}
rc = compressingStream.EndDeflate();
CheckForError(compressingStream, rc, "EndDeflate");
Console.WriteLine("Stage 4: uncompressed bytes in (final): {0,6}", compressingStream.TotalBytesIn);
Console.WriteLine(" compressed bytes out (final): {0,6}", compressingStream.TotalBytesOut);
ZlibCodec decompressingStream = new ZlibCodec(CompressionMode.Decompress);
decompressingStream.InputBuffer = compressedBytes;
decompressingStream.NextIn = 0;
decompressingStream.AvailableBytesIn = bufferSize;
// upon inflating, we overwrite the decompressedBytes buffer repeatedly
while (true)
{
decompressingStream.OutputBuffer = decompressedBytes;
decompressingStream.NextOut = 0;
decompressingStream.AvailableBytesOut = decompressedBytes.Length;
rc = decompressingStream.Inflate(FlushType.None);
if (rc == ZlibConstants.Z_STREAM_END)
break;
CheckForError(decompressingStream, rc, "inflate large");
}
rc = decompressingStream.EndInflate();
CheckForError(decompressingStream, rc, "EndInflate");
if (decompressingStream.TotalBytesOut != 2 * decompressedBytes.Length + bufferSize / 2)
{
System.Console.WriteLine("bad large inflate: " + decompressingStream.TotalBytesOut);
System.Environment.Exit(1);
}
for (j = 0; j < decompressedBytes.Length; j++)
if (decompressedBytes[j] == 0)
break;
Console.WriteLine("compressed length: {0}", compressingStream.TotalBytesOut);
Console.WriteLine("decompressed length (expected): {0}", 2 * decompressedBytes.Length + bufferSize / 2);
Console.WriteLine("decompressed length (actual) : {0}", decompressingStream.TotalBytesOut);
}
private void _PerpetualWriterMethod(object state)
{
try
{
ZlibCodec zlibCodec;
while (true)
{
_sessionReset.WaitOne();
if (_isDisposed)
{
return;
}
_sessionReset.Reset();
WorkItem workItem = null;
CRC32 cRC = new CRC32();
bool flag;
while (true)
{
workItem = _pool[_nextToWrite % _pc];
lock (workItem)
{
if (_noMoreInputForThisSegment)
{
}
while (true)
{
if (workItem.status == 4)
{
workItem.status = 5;
_outStream.Write(workItem.compressed, 0, workItem.compressedBytesAvailable);
cRC.Combine(workItem.crc, workItem.inputBytesAvailable);
_totalBytesProcessed += workItem.inputBytesAvailable;
_nextToWrite++;
workItem.inputBytesAvailable = 0;
workItem.status = 6;
Monitor.Pulse(workItem);
break;
}
int num = 0;
while (workItem.status != 4 && (!_noMoreInputForThisSegment || _nextToWrite != _nextToFill))
{
num++;
Monitor.Pulse(workItem);
Monitor.Wait(workItem);
if (workItem.status != 4)
{
}
}
if (_noMoreInputForThisSegment && _nextToWrite == _nextToFill)
{
break;
}
flag = true;
}
}
if (_noMoreInputForThisSegment)
{
}
if (_noMoreInputForThisSegment && _nextToWrite == _nextToFill)
{
break;
}
flag = true;
}
byte[] array = new byte[128];
zlibCodec = new ZlibCodec();
int num2 = zlibCodec.InitializeDeflate(_compressLevel, wantRfc1950Header: false);
zlibCodec.InputBuffer = null;
zlibCodec.NextIn = 0;
zlibCodec.AvailableBytesIn = 0;
zlibCodec.OutputBuffer = array;
zlibCodec.NextOut = 0;
zlibCodec.AvailableBytesOut = array.Length;
num2 = zlibCodec.Deflate(FlushType.Finish);
if (num2 != 1 && num2 != 0)
{
break;
}
if (array.Length - zlibCodec.AvailableBytesOut > 0)
{
_outStream.Write(array, 0, array.Length - zlibCodec.AvailableBytesOut);
}
zlibCodec.EndDeflate();
_Crc32 = cRC.Crc32Result;
_writingDone.Set();
flag = true;
}
throw new Exception("deflating: " + zlibCodec.Message);
}
catch (Exception pendingException)
{
lock (_eLock)
{
if (_pendingException != null)
{
_pendingException = pendingException;
}
}
}
}
private void _PerpetualWriterMethod(object state)
{
TraceOutput(TraceBits.WriterThread, "_PerpetualWriterMethod START");
try
{
do
{
// wait for the next session
TraceOutput(TraceBits.Synch | TraceBits.WriterThread, "Synch _sessionReset.WaitOne(begin) PWM");
_sessionReset.WaitOne();
TraceOutput(TraceBits.Synch | TraceBits.WriterThread, "Synch _sessionReset.WaitOne(done) PWM");
if (_isDisposed) break;
TraceOutput(TraceBits.Synch | TraceBits.WriterThread, "Synch _sessionReset.Reset() PWM");
_sessionReset.Reset();
// repeatedly write buffers as they become ready
WorkItem workitem = null;
CRC32 c= new CRC32();
do
{
workitem = _pool[_nextToWrite % _pc];
lock(workitem)
{
if (_noMoreInputForThisSegment)
TraceOutput(TraceBits.Write,
"Write drain wi({0}) stat({1}) canuse({2}) cba({3})",
workitem.index,
workitem.status,
(workitem.status == (int)WorkItem.Status.Compressed),
workitem.compressedBytesAvailable);
do
{
if (workitem.status == (int)WorkItem.Status.Compressed)
{
TraceOutput(TraceBits.WriteBegin,
"Write begin wi({0}) stat({1}) cba({2})",
workitem.index,
workitem.status,
workitem.compressedBytesAvailable);
workitem.status = (int)WorkItem.Status.Writing;
_outStream.Write(workitem.compressed, 0, workitem.compressedBytesAvailable);
c.Combine(workitem.crc, workitem.inputBytesAvailable);
_totalBytesProcessed += workitem.inputBytesAvailable;
_nextToWrite++;
workitem.inputBytesAvailable= 0;
workitem.status = (int)WorkItem.Status.Done;
TraceOutput(TraceBits.WriteDone,
"Write done wi({0}) stat({1}) cba({2})",
workitem.index,
workitem.status,
workitem.compressedBytesAvailable);
Monitor.Pulse(workitem);
break;
}
else
{
int wcycles = 0;
// I've locked a workitem I cannot use.
// Therefore, wake someone else up, and then release the lock.
while (workitem.status != (int)WorkItem.Status.Compressed)
{
TraceOutput(TraceBits.WriteWait,
"Write waiting wi({0}) stat({1}) nw({2}) nf({3}) nomore({4})",
workitem.index,
workitem.status,
_nextToWrite, _nextToFill,
_noMoreInputForThisSegment );
if (_noMoreInputForThisSegment && _nextToWrite == _nextToFill)
break;
wcycles++;
// wake up someone else
Monitor.Pulse(workitem);
// release and wait
Monitor.Wait(workitem);
if (workitem.status == (int)WorkItem.Status.Compressed)
TraceOutput(TraceBits.WriteWait,
"Write A-OK wi({0}) stat({1}) iba({2}) cba({3}) cyc({4})",
workitem.index,
workitem.status,
workitem.inputBytesAvailable,
workitem.compressedBytesAvailable,
wcycles);
}
if (_noMoreInputForThisSegment && _nextToWrite == _nextToFill)
break;
}
}
while (true);
}
if (_noMoreInputForThisSegment)
TraceOutput(TraceBits.Write,
"Write nomore nw({0}) nf({1}) break({2})",
_nextToWrite, _nextToFill, (_nextToWrite == _nextToFill));
if (_noMoreInputForThisSegment && _nextToWrite == _nextToFill)
break;
} while (true);
// Finish:
// After writing a series of buffers, closing each one with
// Flush.Sync, we now write the final one as Flush.Finish, and
// then stop.
byte[] buffer = new byte[128];
ZlibCodec compressor = new ZlibCodec();
int rc = compressor.InitializeDeflate(_compressLevel, false);
compressor.InputBuffer = null;
compressor.NextIn = 0;
compressor.AvailableBytesIn = 0;
compressor.OutputBuffer = buffer;
compressor.NextOut = 0;
compressor.AvailableBytesOut = buffer.Length;
rc = compressor.Deflate(FlushType.Finish);
if (rc != ZlibConstants.Z_STREAM_END && rc != ZlibConstants.Z_OK)
throw new Exception("deflating: " + compressor.Message);
if (buffer.Length - compressor.AvailableBytesOut > 0)
{
TraceOutput(TraceBits.WriteBegin,
"Write begin flush bytes({0})",
buffer.Length - compressor.AvailableBytesOut);
_outStream.Write(buffer, 0, buffer.Length - compressor.AvailableBytesOut);
TraceOutput(TraceBits.WriteBegin,
"Write done flush");
}
compressor.EndDeflate();
_Crc32 = c.Crc32Result;
// signal that writing is complete:
TraceOutput(TraceBits.Synch, "Synch _writingDone.Set() PWM");
_writingDone.Set();
}
while (true);
}
catch (System.Exception exc1)
{
lock(_eLock)
{
// expose the exception to the main thread
if (_pendingException!=null)
_pendingException = exc1;
}
}
TraceOutput(TraceBits.WriterThread, "_PerpetualWriterMethod FINIS");
}
private void _FlushFinish()
{
// After writing a series of compressed buffers, each one closed
// with Flush.Sync, we now write the final one as Flush.Finish,
// and then stop.
byte[] buffer = new byte[128];
var compressor = new ZlibCodec();
int rc = compressor.InitializeDeflate(_compressLevel, false);
compressor.InputBuffer = null;
compressor.NextIn = 0;
compressor.AvailableBytesIn = 0;
compressor.OutputBuffer = buffer;
compressor.NextOut = 0;
compressor.AvailableBytesOut = buffer.Length;
rc = compressor.Deflate(FlushType.Finish);
if (rc != ZlibConstants.Z_STREAM_END && rc != ZlibConstants.Z_OK)
throw new Exception("deflating: " + compressor.Message);
if (buffer.Length - compressor.AvailableBytesOut > 0)
{
TraceOutput(TraceBits.EmitBegin,
"Emit begin flush bytes({0})",
buffer.Length - compressor.AvailableBytesOut);
_outStream.Write(buffer, 0, buffer.Length - compressor.AvailableBytesOut);
TraceOutput(TraceBits.EmitDone,
"Emit done flush");
}
compressor.EndDeflate();
_Crc32 = _runningCrc.Crc32Result;
}
private byte[] DeflateBuffer(byte[] b, CompressionLevel level)
{
int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];
ZlibCodec compressor = new ZlibCodec();
TestContext.WriteLine("\n============================================");
TestContext.WriteLine("Size of Buffer to Deflate: {0} bytes.", b.Length);
MemoryStream ms = new MemoryStream();
int rc = compressor.InitializeDeflate(level);
compressor.InputBuffer = b;
compressor.NextIn = 0;
compressor.AvailableBytesIn = b.Length;
compressor.OutputBuffer = buffer;
for (int pass = 0; pass < 2; pass++)
{
FlushType flush = (pass==0)
? FlushType.None
: FlushType.Finish;
do
{
compressor.NextOut = 0;
compressor.AvailableBytesOut = buffer.Length;
rc = compressor.Deflate(flush);
if (rc != ZlibConstants.Z_OK && rc != ZlibConstants.Z_STREAM_END)
throw new Exception("deflating: " + compressor.Message);
if (buffer.Length - compressor.AvailableBytesOut > 0)
ms.Write(compressor.OutputBuffer, 0, buffer.Length - compressor.AvailableBytesOut);
}
while (compressor.AvailableBytesIn > 0 || compressor.AvailableBytesOut == 0);
}
compressor.EndDeflate();
Console.WriteLine("TBO({0}).", compressor.TotalBytesOut);
ms.Seek(0, SeekOrigin.Begin);
byte[] c = new byte[compressor.TotalBytesOut];
ms.Read(c, 0, c.Length);
return c;
}
private void Run()
{
int rc;
int comprLen = 40000;
int uncomprLen = comprLen;
byte[] CompressedBytes = new byte[comprLen];
byte[] DecompressedBytes = new byte[uncomprLen];
string TextToCompress = "This is the text that will be compressed.";
byte[] BytesToCompress = System.Text.ASCIIEncoding.ASCII.GetBytes(TextToCompress);
ZlibCodec compressor = new ZlibCodec(CompressionMode.Compress);
compressor.InputBuffer = BytesToCompress;
compressor.NextIn = 0;
compressor.OutputBuffer = CompressedBytes;
compressor.NextOut = 0;
compressor.AvailableBytesIn = 3;
compressor.AvailableBytesOut = CompressedBytes.Length;
rc = compressor.Deflate(ZlibConstants.Z_FULL_FLUSH);
CheckForError(compressor, rc, "Deflate");
CompressedBytes[3]++; // force an error in first compressed block // dinoch
compressor.AvailableBytesIn = TextToCompress.Length - 3;
rc = compressor.Deflate(ZlibConstants.Z_FINISH);
if (rc != ZlibConstants.Z_STREAM_END)
{
CheckForError(compressor, rc, "Deflate");
}
rc = compressor.EndDeflate();
CheckForError(compressor, rc, "EndDeflate");
comprLen = (int) (compressor.TotalBytesOut);
ZlibCodec decompressor = new ZlibCodec(CompressionMode.Decompress);
decompressor.InputBuffer = CompressedBytes;
decompressor.NextIn = 0;
decompressor.AvailableBytesIn = 2;
decompressor.OutputBuffer = DecompressedBytes;
decompressor.NextOut = 0;
decompressor.AvailableBytesOut = DecompressedBytes.Length;
rc = decompressor.Inflate(ZlibConstants.Z_NO_FLUSH);
CheckForError(decompressor, rc, "Inflate");
decompressor.AvailableBytesIn = CompressedBytes.Length - 2;
rc = decompressor.SyncInflate();
CheckForError(decompressor, rc, "SyncInflate");
bool gotException = false;
try
{
rc = decompressor.Inflate(ZlibConstants.Z_FINISH);
}
catch (ZlibException ex1)
{
Console.WriteLine("Got Expected Exception: " + ex1);
gotException = true;
}
if (!gotException)
{
System.Console.Out.WriteLine("inflate should report DATA_ERROR");
/* Because of incorrect adler32 */
System.Environment.Exit(1);
}
rc = decompressor.EndInflate();
CheckForError(decompressor, rc, "EndInflate");
int j = 0;
for (; j < DecompressedBytes.Length; j++)
if (DecompressedBytes[j] == 0)
break;
var result = System.Text.ASCIIEncoding.ASCII.GetString(DecompressedBytes, 0, j);
Console.WriteLine("orig length: {0}", TextToCompress.Length);
Console.WriteLine("compressed length: {0}", compressor.TotalBytesOut);
Console.WriteLine("uncompressed length: {0}", decompressor.TotalBytesOut);
Console.WriteLine("result length: {0}", result.Length);
Console.WriteLine("result of inflate:\n(Thi){0}", result);
}
public void Zlib_BasicDeflateAndInflate()
{
string TextToCompress = LoremIpsum;
int rc;
int bufferSize = 40000;
byte[] compressedBytes = new byte[bufferSize];
byte[] decompressedBytes = new byte[bufferSize];
ZlibCodec compressingStream = new ZlibCodec();
rc = compressingStream.InitializeDeflate(CompressionLevel.Default);
Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at InitializeDeflate() [{0}]", compressingStream.Message));
compressingStream.InputBuffer = System.Text.ASCIIEncoding.ASCII.GetBytes(TextToCompress);
compressingStream.NextIn = 0;
compressingStream.OutputBuffer = compressedBytes;
compressingStream.NextOut = 0;
while (compressingStream.TotalBytesIn != TextToCompress.Length && compressingStream.TotalBytesOut < bufferSize)
{
compressingStream.AvailableBytesIn = compressingStream.AvailableBytesOut = 1; // force small buffers
rc = compressingStream.Deflate(FlushType.None);
Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at Deflate(1) [{0}]", compressingStream.Message));
}
while (true)
{
compressingStream.AvailableBytesOut = 1;
rc = compressingStream.Deflate(FlushType.Finish);
if (rc == ZlibConstants.Z_STREAM_END)
break;
Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at Deflate(2) [{0}]", compressingStream.Message));
}
rc = compressingStream.EndDeflate();
Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at EndDeflate() [{0}]", compressingStream.Message));
ZlibCodec decompressingStream = new ZlibCodec();
decompressingStream.InputBuffer = compressedBytes;
decompressingStream.NextIn = 0;
decompressingStream.OutputBuffer = decompressedBytes;
decompressingStream.NextOut = 0;
rc = decompressingStream.InitializeInflate();
Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at InitializeInflate() [{0}]", decompressingStream.Message));
//CheckForError(decompressingStream, rc, "inflateInit");
while (decompressingStream.TotalBytesOut < decompressedBytes.Length && decompressingStream.TotalBytesIn < bufferSize)
{
decompressingStream.AvailableBytesIn = decompressingStream.AvailableBytesOut = 1; /* force small buffers */
rc = decompressingStream.Inflate(FlushType.None);
if (rc == ZlibConstants.Z_STREAM_END)
break;
Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at Inflate() [{0}]", decompressingStream.Message));
//CheckForError(decompressingStream, rc, "inflate");
}
rc = decompressingStream.EndInflate();
Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at EndInflate() [{0}]", decompressingStream.Message));
//CheckForError(decompressingStream, rc, "inflateEnd");
int j = 0;
for (; j < decompressedBytes.Length; j++)
if (decompressedBytes[j] == 0)
break;
Assert.AreEqual<int>(TextToCompress.Length, j, String.Format("Unequal lengths"));
int i = 0;
for (i = 0; i < j; i++)
if (TextToCompress[i] != decompressedBytes[i])
break;
Assert.AreEqual<int>(j, i, String.Format("Non-identical content"));
var result = System.Text.ASCIIEncoding.ASCII.GetString(decompressedBytes, 0, j);
TestContext.WriteLine("orig length: {0}", TextToCompress.Length);
TestContext.WriteLine("compressed length: {0}", compressingStream.TotalBytesOut);
TestContext.WriteLine("decompressed length: {0}", decompressingStream.TotalBytesOut);
TestContext.WriteLine("result length: {0}", result.Length);
TestContext.WriteLine("result of inflate:\n{0}", result);
return;
}
public void Zlib_BasicDictionaryDeflateInflate()
{
int rc;
int comprLen = 40000;
int uncomprLen = comprLen;
byte[] uncompr = new byte[uncomprLen];
byte[] compr = new byte[comprLen];
//long dictId;
ZlibCodec compressor = new ZlibCodec();
rc = compressor.InitializeDeflate(CompressionLevel.BestCompression);
Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at InitializeDeflate() [{0}]", compressor.Message));
string dictionaryWord = "hello ";
byte[] dictionary = System.Text.ASCIIEncoding.ASCII.GetBytes(dictionaryWord);
string TextToCompress = "hello, hello! How are you, Joe? I said hello. ";
byte[] BytesToCompress = System.Text.ASCIIEncoding.ASCII.GetBytes(TextToCompress);
rc = compressor.SetDictionary(dictionary);
Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at SetDeflateDictionary() [{0}]", compressor.Message));
int dictId = compressor.Adler32;
compressor.OutputBuffer = compr;
compressor.NextOut = 0;
compressor.AvailableBytesOut = comprLen;
compressor.InputBuffer = BytesToCompress;
compressor.NextIn = 0;
compressor.AvailableBytesIn = BytesToCompress.Length;
rc = compressor.Deflate(FlushType.Finish);
Assert.AreEqual<int>(ZlibConstants.Z_STREAM_END, rc, String.Format("at Deflate() [{0}]", compressor.Message));
rc = compressor.EndDeflate();
Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at EndDeflate() [{0}]", compressor.Message));
ZlibCodec decompressor = new ZlibCodec();
decompressor.InputBuffer = compr;
decompressor.NextIn = 0;
decompressor.AvailableBytesIn = comprLen;
rc = decompressor.InitializeInflate();
Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at InitializeInflate() [{0}]", decompressor.Message));
decompressor.OutputBuffer = uncompr;
decompressor.NextOut = 0;
decompressor.AvailableBytesOut = uncomprLen;
while (true)
{
rc = decompressor.Inflate(FlushType.None);
if (rc == ZlibConstants.Z_STREAM_END)
{
break;
}
if (rc == ZlibConstants.Z_NEED_DICT)
{
Assert.AreEqual<long>(dictId, decompressor.Adler32, "Unexpected Dictionary");
rc = decompressor.SetDictionary(dictionary);
}
Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at Inflate/SetInflateDictionary() [{0}]", decompressor.Message));
}
rc = decompressor.EndInflate();
Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at EndInflate() [{0}]", decompressor.Message));
int j = 0;
for (; j < uncompr.Length; j++)
if (uncompr[j] == 0)
break;
Assert.AreEqual<int>(TextToCompress.Length, j, String.Format("Unequal lengths"));
int i = 0;
for (i = 0; i < j; i++)
if (TextToCompress[i] != uncompr[i])
break;
Assert.AreEqual<int>(j, i, String.Format("Non-identical content"));
var result = System.Text.ASCIIEncoding.ASCII.GetString(uncompr, 0, j);
TestContext.WriteLine("orig length: {0}", TextToCompress.Length);
TestContext.WriteLine("compressed length: {0}", compressor.TotalBytesOut);
TestContext.WriteLine("uncompressed length: {0}", decompressor.TotalBytesOut);
TestContext.WriteLine("result length: {0}", result.Length);
TestContext.WriteLine("result of inflate:\n{0}", result);
}
public void Zlib_Codec_TestLargeDeflateInflate()
{
int rc;
int j;
int bufferSize = 80000;
byte[] compressedBytes = new byte[bufferSize];
byte[] workBuffer = new byte[bufferSize / 4];
ZlibCodec compressingStream = new ZlibCodec();
rc = compressingStream.InitializeDeflate(CompressionLevel.Level1);
Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at InitializeDeflate() [{0}]", compressingStream.Message));
compressingStream.OutputBuffer = compressedBytes;
compressingStream.AvailableBytesOut = compressedBytes.Length;
compressingStream.NextOut = 0;
System.Random rnd = new Random();
for (int k = 0; k < 4; k++)
{
switch (k)
{
case 0:
// At this point, workBuffer is all zeroes, so it should compress very well.
break;
case 1:
// switch to no compression, keep same workBuffer (all zeroes):
compressingStream.SetDeflateParams(CompressionLevel.None, CompressionStrategy.Default);
break;
case 2:
// Insert data into workBuffer, and switch back to compressing mode.
// we'll use lengths of the same random byte:
for (int i = 0; i < workBuffer.Length / 1000; i++)
{
byte b = (byte)rnd.Next();
int n = 500 + rnd.Next(500);
for (j = 0; j < n; j++)
workBuffer[j + i] = b;
i += j - 1;
}
compressingStream.SetDeflateParams(CompressionLevel.BestCompression, CompressionStrategy.Filtered);
break;
case 3:
// insert totally random data into the workBuffer
rnd.NextBytes(workBuffer);
break;
}
compressingStream.InputBuffer = workBuffer;
compressingStream.NextIn = 0;
compressingStream.AvailableBytesIn = workBuffer.Length;
rc = compressingStream.Deflate(FlushType.None);
Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at Deflate({0}) [{1}]", k, compressingStream.Message));
if (k == 0)
Assert.AreEqual<int>(0, compressingStream.AvailableBytesIn, "Deflate should be greedy.");
TestContext.WriteLine("Stage {0}: uncompressed/compresssed bytes so far: ({1,6}/{2,6})",
k, compressingStream.TotalBytesIn, compressingStream.TotalBytesOut);
}
rc = compressingStream.Deflate(FlushType.Finish);
Assert.AreEqual<int>(ZlibConstants.Z_STREAM_END, rc, String.Format("at Deflate() [{0}]", compressingStream.Message));
rc = compressingStream.EndDeflate();
Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at EndDeflate() [{0}]", compressingStream.Message));
TestContext.WriteLine("Final: uncompressed/compressed bytes: ({0,6},{1,6})",
compressingStream.TotalBytesIn, compressingStream.TotalBytesOut);
ZlibCodec decompressingStream = new ZlibCodec(CompressionMode.Decompress);
decompressingStream.InputBuffer = compressedBytes;
decompressingStream.NextIn = 0;
decompressingStream.AvailableBytesIn = bufferSize;
// upon inflating, we overwrite the decompressedBytes buffer repeatedly
int nCycles = 0;
while (true)
{
decompressingStream.OutputBuffer = workBuffer;
decompressingStream.NextOut = 0;
decompressingStream.AvailableBytesOut = workBuffer.Length;
rc = decompressingStream.Inflate(FlushType.None);
nCycles++;
if (rc == ZlibConstants.Z_STREAM_END)
break;
Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at Inflate() [{0}] TotalBytesOut={1}",
decompressingStream.Message, decompressingStream.TotalBytesOut));
}
rc = decompressingStream.EndInflate();
Assert.AreEqual<int>(ZlibConstants.Z_OK, rc, String.Format("at EndInflate() [{0}]", decompressingStream.Message));
Assert.AreEqual<int>(4 * workBuffer.Length, (int)decompressingStream.TotalBytesOut);
TestContext.WriteLine("compressed length: {0}", compressingStream.TotalBytesOut);
TestContext.WriteLine("decompressed length (expected): {0}", 4 * workBuffer.Length);
TestContext.WriteLine("decompressed length (actual) : {0}", decompressingStream.TotalBytesOut);
TestContext.WriteLine("decompression cycles: {0}", nCycles);
}
private void Run()
{
int rc;
int bufferSize = 40000;
byte[] compressedBytes = new byte[bufferSize];
byte[] decompressedBytes = new byte[bufferSize];
ZlibCodec compressingStream = new ZlibCodec();
rc = compressingStream.InitializeDeflate(CompressionLevel.LEVEL9_BEST_COMPRESSION);
CheckForError(compressingStream, rc, "InitializeDeflate");
string dictionaryWord = "hello ";
byte[] dictionary = System.Text.ASCIIEncoding.ASCII.GetBytes(dictionaryWord);
string TextToCompress = "hello, hello! How are you, Joe? ";
byte[] BytesToCompress = System.Text.ASCIIEncoding.ASCII.GetBytes(TextToCompress);
rc = compressingStream.SetDictionary(dictionary);
CheckForError(compressingStream, rc, "SetDeflateDictionary");
long dictId = compressingStream.Adler32;
compressingStream.OutputBuffer = compressedBytes;
compressingStream.NextOut = 0;
compressingStream.AvailableBytesOut = bufferSize;
compressingStream.InputBuffer = BytesToCompress;
compressingStream.NextIn = 0;
compressingStream.AvailableBytesIn = BytesToCompress.Length;
rc = compressingStream.Deflate(ZlibConstants.Z_FINISH);
if (rc != ZlibConstants.Z_STREAM_END)
{
System.Console.Out.WriteLine("deflate should report Z_STREAM_END");
System.Environment.Exit(1);
}
rc = compressingStream.EndDeflate();
CheckForError(compressingStream, rc, "deflateEnd");
ZlibCodec decompressingStream = new ZlibCodec();
decompressingStream.InputBuffer = compressedBytes;
decompressingStream.NextIn = 0;
decompressingStream.AvailableBytesIn = bufferSize;
rc = decompressingStream.InitializeInflate();
CheckForError(decompressingStream, rc, "inflateInit");
decompressingStream.OutputBuffer = decompressedBytes;
decompressingStream.NextOut = 0;
decompressingStream.AvailableBytesOut = decompressedBytes.Length;
while (true)
{
rc = decompressingStream.Inflate(ZlibConstants.Z_NO_FLUSH);
if (rc == ZlibConstants.Z_STREAM_END)
{
break;
}
if (rc == ZlibConstants.Z_NEED_DICT)
{
if ((int)decompressingStream.Adler32 != (int)dictId)
{
System.Console.Out.WriteLine("unexpected dictionary");
System.Environment.Exit(1);
}
rc = decompressingStream.SetDictionary(dictionary);
}
CheckForError(decompressingStream, rc, "inflate with dict");
}
rc = decompressingStream.EndInflate();
CheckForError(decompressingStream, rc, "EndInflate");
int j = 0;
for (; j < decompressedBytes.Length; j++)
if (decompressedBytes[j] == 0)
break;
var result = System.Text.ASCIIEncoding.ASCII.GetString(decompressedBytes, 0, j);
Console.WriteLine("orig length: {0}", TextToCompress.Length);
Console.WriteLine("compressed length: {0}", compressingStream.TotalBytesOut);
Console.WriteLine("decompressed length: {0}", decompressingStream.TotalBytesOut);
Console.WriteLine("result length: {0}", result.Length);
Console.WriteLine("result of inflate:\n{0}", result);
}