private Int32 FigureCrc32()
{
if (_crcCalculated == false)
{
Stream input = null;
// get the original stream:
if (this._Source == ZipEntrySource.WriteDelegate)
{
var output = new Alienlab.Crc.CrcCalculatorStream(Stream.Null);
// allow the application to write the data
this._WriteDelegate(this.FileName, output);
_Crc32 = output.Crc;
}
else if (this._Source == ZipEntrySource.ZipFile)
{
// nothing to do - the CRC is already set
}
else
{
if (this._Source == ZipEntrySource.Stream)
{
PrepSourceStream();
input = this._sourceStream;
}
else if (this._Source == ZipEntrySource.JitStream)
{
// allow the application to open the stream
if (this._sourceStream == null)
_sourceStream = this._OpenDelegate(this.FileName);
PrepSourceStream();
input = this._sourceStream;
}
else if (this._Source == ZipEntrySource.ZipOutputStream)
{
}
else
{
//input = File.OpenRead(LocalFileName);
input = File.Open(LocalFileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
}
var crc32 = new Alienlab.Crc.CRC32();
_Crc32 = crc32.GetCrc32(input);
if (_sourceStream == null)
{
#if NETCF
input.Close();
#else
input.Dispose();
#endif
}
}
_crcCalculated = true;
}
return _Crc32;
}
public void Zlib_ParallelDeflateStream()
{
var sw = new System.Diagnostics.Stopwatch();
sw.Start();
TestContext.WriteLine("{0}: Zlib_ParallelDeflateStream Start", sw.Elapsed);
int sz = 256*1024 + this.rnd.Next(120000);
string FileToCompress = System.IO.Path.Combine(TopLevelDir, String.Format("Zlib_ParallelDeflateStream.{0}.txt", sz));
CreateAndFillFileText( FileToCompress, sz);
TestContext.WriteLine("{0}: Created file: {1}", sw.Elapsed, FileToCompress );
byte[] original = File.ReadAllBytes(FileToCompress);
int crc1 = DoCrc(FileToCompress);
TestContext.WriteLine("{0}: Original CRC: {1:X8}", sw.Elapsed, crc1 );
byte[] working = new byte[WORKING_BUFFER_SIZE];
int n = -1;
long originalLength;
MemoryStream ms1 = new MemoryStream();
{
using (FileStream fs1 = File.OpenRead(FileToCompress))
{
originalLength = fs1.Length;
using (var compressor = new Alienlab.Zlib.ParallelDeflateOutputStream(ms1, true))
{
while ((n = fs1.Read(working, 0, working.Length)) != 0)
{
compressor.Write(working, 0, n);
}
}
}
ms1.Seek(0, SeekOrigin.Begin);
}
TestContext.WriteLine("{0}: Compressed {1} bytes into {2} bytes", sw.Elapsed,
originalLength, ms1.Length);
var crc = new Alienlab.Crc.CRC32();
int crc2= 0;
byte[] decompressedBytes= null;
using (MemoryStream ms2 = new MemoryStream())
{
using (var decompressor = new DeflateStream(ms1, CompressionMode.Decompress, false))
{
while ((n = decompressor.Read(working, 0, working.Length)) != 0)
{
ms2.Write(working, 0, n);
}
}
TestContext.WriteLine("{0}: Decompressed", sw.Elapsed);
TestContext.WriteLine("{0}: Decompressed length: {1}", sw.Elapsed, ms2.Length);
ms2.Seek(0, SeekOrigin.Begin);
crc2 = crc.GetCrc32(ms2);
decompressedBytes = ms2.ToArray();
TestContext.WriteLine("{0}: Decompressed CRC: {1:X8}", sw.Elapsed, crc2 );
}
TestContext.WriteLine("{0}: Checking...", sw.Elapsed );
bool check = true;
if (originalLength != decompressedBytes.Length)
{
TestContext.WriteLine("Different lengths.");
check = false;
}
else
{
for (int i = 0; i < decompressedBytes.Length; i++)
{
if (original[i] != decompressedBytes[i])
{
TestContext.WriteLine("byte {0} differs", i);
check = false;
break;
}
}
}
Assert.IsTrue(check,"Data check failed");
TestContext.WriteLine("{0}: Done...", sw.Elapsed );
}