public void Zlib_GZipStream_FileName_And_Comments()
{
// select the name of the zip file
string FileToCompress = System.IO.Path.Combine(TopLevelDir, "Zlib_GZipStream.dat");
Assert.IsFalse(System.IO.File.Exists(FileToCompress), "The temporary zip file '{0}' already exists.", FileToCompress);
byte[] working = new byte[WORKING_BUFFER_SIZE];
int n = -1;
int sz = this.rnd.Next(21000) + 15000;
TestContext.WriteLine(" Creating file: {0} sz({1})", FileToCompress, sz);
CreateAndFillFileText(FileToCompress, sz);
System.IO.FileInfo fi1 = new System.IO.FileInfo(FileToCompress);
int crc1 = DoCrc(FileToCompress);
// four trials, all combos of FileName and Comment null or not null.
for (int k = 0; k < 4; k++)
{
string CompressedFile = String.Format("{0}-{1}.compressed", FileToCompress, k);
using (Stream input = File.OpenRead(FileToCompress))
{
using (FileStream raw = new FileStream(CompressedFile, FileMode.Create))
{
using (GZipStream compressor =
new GZipStream(raw, CompressionMode.Compress, CompressionLevel.BestCompression, true))
{
// FileName is optional metadata in the GZip bytestream
if (k % 2 == 1)
compressor.FileName = FileToCompress;
// Comment is optional metadata in the GZip bytestream
if (k > 2)
compressor.Comment = "Compressing: " + FileToCompress;
byte[] buffer = new byte[1024];
n = -1;
while (n != 0)
{
if (n > 0)
compressor.Write(buffer, 0, n);
n = input.Read(buffer, 0, buffer.Length);
}
}
}
}
System.IO.FileInfo fi2 = new System.IO.FileInfo(CompressedFile);
Assert.IsTrue(fi1.Length > fi2.Length, String.Format("Compressed File is not smaller, trial {0} ({1}!>{2})", k, fi1.Length, fi2.Length));
// decompress twice:
// once with System.IO.Compression.GZipStream and once with Alienlab.Zlib.GZipStream
for (int j = 0; j < 2; j++)
{
using (var input = System.IO.File.OpenRead(CompressedFile))
{
Stream decompressor = null;
try
{
switch (j)
{
case 0:
decompressor = new Alienlab.Zlib.GZipStream(input, CompressionMode.Decompress, true);
break;
case 1:
decompressor = new System.IO.Compression.GZipStream(input, System.IO.Compression.CompressionMode.Decompress, true);
break;
}
string DecompressedFile =
String.Format("{0}.{1}.decompressed", CompressedFile, (j == 0) ? "Ionic" : "BCL");
TestContext.WriteLine("........{0} ...", System.IO.Path.GetFileName(DecompressedFile));
using (var s2 = System.IO.File.Create(DecompressedFile))
{
n = -1;
while (n != 0)
{
n = decompressor.Read(working, 0, working.Length);
if (n > 0)
s2.Write(working, 0, n);
}
}
int crc2 = DoCrc(DecompressedFile);
Assert.AreEqual<Int32>(crc1, crc2);
}
finally
{
if (decompressor != null)
decompressor.Dispose();
}
}
}
}
}
public void Zlib_Streams_VariousSizes()
{
byte[] working = new byte[WORKING_BUFFER_SIZE];
int n = -1;
Int32[] Sizes = { 8000, 88000, 188000, 388000, 580000, 1580000 };
for (int p = 0; p < Sizes.Length; p++)
{
// both binary and text files
for (int m = 0; m < 2; m++)
{
int sz = this.rnd.Next(Sizes[p]) + Sizes[p];
string FileToCompress = System.IO.Path.Combine(TopLevelDir, String.Format("Zlib_Streams.{0}.{1}", sz, (m == 0) ? "txt" : "bin"));
Assert.IsFalse(System.IO.File.Exists(FileToCompress), "The temporary file '{0}' already exists.", FileToCompress);
TestContext.WriteLine("Creating file {0} {1} bytes", FileToCompress, sz);
if (m == 0)
CreateAndFillFileText(FileToCompress, sz);
else
_CreateAndFillBinary(FileToCompress, sz, false);
int crc1 = DoCrc(FileToCompress);
TestContext.WriteLine("Initial CRC: 0x{0:X8}", crc1);
// try both GZipStream and DeflateStream
for (int k = 0; k < 2; k++)
{
// compress with Alienlab.and System.IO.Compression
for (int i = 0; i < 2; i++)
{
string CompressedFileRoot = String.Format("{0}.{1}.{2}.compressed", FileToCompress,
(k == 0) ? "GZIP" : "DEFLATE",
(i == 0) ? "Ionic" : "BCL");
int x = k + i * 2;
int z = (x == 0) ? 4 : 1;
// why 4 trials?? (only for GZIP and Alienlab.
for (int h = 0; h < z; h++)
{
string CompressedFile = (x == 0)
? CompressedFileRoot + ".trial" + h
: CompressedFileRoot;
using (var input = System.IO.File.OpenRead(FileToCompress))
{
using (var raw = System.IO.File.Create(CompressedFile))
{
Stream compressor = null;
try
{
switch (x)
{
case 0: // k == 0, i == 0
compressor = new Alienlab.Zlib.GZipStream(raw, CompressionMode.Compress, true);
break;
case 1: // k == 1, i == 0
compressor = new Alienlab.Zlib.DeflateStream(raw, CompressionMode.Compress, true);
break;
case 2: // k == 0, i == 1
compressor = new System.IO.Compression.GZipStream(raw, System.IO.Compression.CompressionMode.Compress, true);
break;
case 3: // k == 1, i == 1
compressor = new System.IO.Compression.DeflateStream(raw, System.IO.Compression.CompressionMode.Compress, true);
break;
}
//TestContext.WriteLine("Compress with: {0} ..", compressor.GetType().FullName);
TestContext.WriteLine("........{0} ...", System.IO.Path.GetFileName(CompressedFile));
if (x == 0)
{
if (h != 0)
{
Alienlab.Zlib.GZipStream gzip = compressor as Alienlab.Zlib.GZipStream;
if (h % 2 == 1)
gzip.FileName = FileToCompress;
if (h > 2)
gzip.Comment = "Compressing: " + FileToCompress;
}
}
n = -1;
while ((n = input.Read(working, 0, working.Length)) != 0)
{
compressor.Write(working, 0, n);
}
}
finally
{
if (compressor != null)
compressor.Dispose();
}
}
}
// now, decompress with Alienlab.and System.IO.Compression
// for (int j = 0; j < 2; j++)
for (int j = 1; j >= 0; j--)
{
using (var input = System.IO.File.OpenRead(CompressedFile))
{
Stream decompressor = null;
try
{
int w = k + j * 2;
switch (w)
{
case 0: // k == 0, j == 0
decompressor = new Alienlab.Zlib.GZipStream(input, CompressionMode.Decompress, true);
break;
case 1: // k == 1, j == 0
decompressor = new Alienlab.Zlib.DeflateStream(input, CompressionMode.Decompress, true);
break;
case 2: // k == 0, j == 1
decompressor = new System.IO.Compression.GZipStream(input, System.IO.Compression.CompressionMode.Decompress, true);
break;
case 3: // k == 1, j == 1
decompressor = new System.IO.Compression.DeflateStream(input, System.IO.Compression.CompressionMode.Decompress, true);
break;
}
//TestContext.WriteLine("Decompress: {0} ...", decompressor.GetType().FullName);
string DecompressedFile =
String.Format("{0}.{1}.decompressed", CompressedFile, (j == 0) ? "Ionic" : "BCL");
TestContext.WriteLine("........{0} ...", System.IO.Path.GetFileName(DecompressedFile));
using (var s2 = System.IO.File.Create(DecompressedFile))
{
n = -1;
while (n != 0)
{
n = decompressor.Read(working, 0, working.Length);
if (n > 0)
s2.Write(working, 0, n);
}
}
int crc2 = DoCrc(DecompressedFile);
Assert.AreEqual<UInt32>((UInt32)crc1, (UInt32)crc2);
}
finally
{
if (decompressor != null)
decompressor.Dispose();
}
}
}
}
}
}
}
}
TestContext.WriteLine("Done.");
}
