| public Read ( byte buffer, int offset, int count ) : int | ||
| buffer | byte | An array of bytes. When this method returns, the buffer contains the specified byte array with the values between |
| offset | int | The zero-based byte offset in |
| count | int | The maximum number of bytes to be read from the current stream. |
| return | int | |
public void StreamCompression_FileStream_1Mb ()
{
var filename = System.IO.Path.GetRandomFileName ();
int currentSz = 0;
int sz = 0;
int maxSz = 1024 * 1024 * 10;
List<uint> hashes = new List<uint> (1024);
byte[] buffer;
try
{
// create file
using (var stream = new Lz4CompressionStream (new System.IO.FileStream (filename, System.IO.FileMode.Create), 1 << 18, Lz4Mode.HighCompression, true))
{
while (currentSz < maxSz)
{
buffer = GetStringsAsByte (1024);
stream.Write (buffer, 0, buffer.Length);
currentSz += buffer.Length;
// save hash
hashes.Add (SimpleHash (buffer));
}
}
// read
buffer = new byte[1024];
int ix = 0;
using (var stream = new Lz4DecompressionStream (new System.IO.FileStream (filename, System.IO.FileMode.Open), true))
{
while ((sz = stream.Read (buffer, 0, buffer.Length)) > 0)
{
// check hash
Assert.IsTrue (SimpleHash (buffer) == hashes[ix++], "Hash mismatch");
}
}
}
finally
{
System.IO.File.Delete (filename);
}
}
public void StreamCompression_SimpleTest ()
{
var txt = sampleTxt + sampleTxt + sampleTxt + sampleTxt + sampleTxt + sampleTxt;
var mem = new System.IO.MemoryStream ();
using (var stream = new Lz4CompressionStream (mem, 1 << 18, Lz4Mode.HighCompression))
{
var b = System.Text.Encoding.UTF8.GetBytes (txt);
stream.Write (b, 0, b.Length);
}
// reset stream position
mem.Position = 0;
using (var stream = new Lz4DecompressionStream (mem))
{
var b = new byte[1024];
int sz = stream.Read (b, 0, b.Length);
// validate
Assert.IsTrue (txt == System.Text.Encoding.UTF8.GetString (b, 0, sz));
}
}
public void TestPerfermence(string path)
{
int num2;
FileStream stream;
int num3;
Lz4CompressionStream stream5;
Lz4DecompressionStream stream6;
long length = new FileInfo(path).Length;
byte[] buffer = new byte[0x100000];
Stopwatch stopwatch = Stopwatch.StartNew();
for (num2 = 0; num2 < 10; num2++)
{
using (stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.None, 0x100000))
{
using (FileStream stream2 = new FileStream(path + num2 + ".tmp", FileMode.Create, FileAccess.Write, FileShare.None, 0x100000))
{
while ((num3 = stream.Read(buffer, 0, buffer.Length)) != 0)
{
stream2.Write(buffer, 0, num3);
}
}
}
}
long elapsedMilliseconds = stopwatch.ElapsedMilliseconds;
Console.WriteLine("binary write: {0}MB, eslaped {1}ms, avg {2:N1}MB/s",
(length / 0x400L) / 0x400L, elapsedMilliseconds, ((length * 10f) / elapsedMilliseconds) / 1024f);
for (num2 = 0; num2 < 10; num2++)
{
File.Delete(path + num2 + ".tmp");
}
stopwatch = Stopwatch.StartNew();
for (num2 = 0; num2 < 10; num2++)
{
using (stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.None, 0x100000))
{
using (GZipStream stream3
= new GZipStream(new FileStream(path + num2 + ".tmp", FileMode.Create, FileAccess.Write, FileShare.None, 0x100000),
CompressionMode.Compress))
{
while ((num3 = stream.Read(buffer, 0, buffer.Length)) != 0)
{
stream3.Write(buffer, 0, num3);
}
}
}
}
elapsedMilliseconds = stopwatch.ElapsedMilliseconds;
float num5 = new FileInfo(path).Length / ((float)length);
Console.WriteLine("gzip write: {0}MB, eslaped {1}ms, avg {2:N1}MB/s, compress rate {3:P}",
new object[] { (length / 0x400L) / 0x400L, elapsedMilliseconds, ((length * 10f) / elapsedMilliseconds) / 1024f, num5 });
stopwatch = Stopwatch.StartNew();
for (num2 = 0; num2 < 10; num2++)
{
using (GZipStream stream4 = new GZipStream(
new FileStream(path + num2 + ".tmp",
FileMode.Open, FileAccess.Read, FileShare.None, 0x100000), CompressionMode.Decompress))
{
while (stream4.Read(buffer, 0, buffer.Length) != 0)
{
}
}
}
elapsedMilliseconds = stopwatch.ElapsedMilliseconds;
Console.WriteLine("gzip read: {0}MB, eslaped {1}ms, avg {2:N1}MB/s",
(length / 0x400L) / 0x400L, elapsedMilliseconds, ((length * 10f) / elapsedMilliseconds) / 1024f);
for (num2 = 0; num2 < 10; num2++)
{
File.Delete(path + num2 + ".tmp");
}
stopwatch = Stopwatch.StartNew();
for (num2 = 0; num2 < 10; num2++)
{
using (stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.None, 0x100000))
{
using (stream5
= new Lz4CompressionStream(new FileStream(path + num2 + ".tmp", FileMode.Create, FileAccess.Write, FileShare.None, 0x100000),
0x100000, Lz4Mode.Fast, true))
{
while ((num3 = stream.Read(buffer, 0, buffer.Length)) != 0)
{
stream5.Write(buffer, 0, num3);
}
}
}
}
elapsedMilliseconds = stopwatch.ElapsedMilliseconds;
num5 = new FileInfo(path).Length / ((float)length);
Console.WriteLine("lz4 write: {0}MB, eslaped {1}ms, avg {2:N1}MB/s, compress rate {3:P}",
new object[] { (length / 0x400L) / 0x400L, elapsedMilliseconds, ((length * 10f) / elapsedMilliseconds) / 1024f, num5 });
stopwatch = Stopwatch.StartNew();
for (num2 = 0; num2 < 10; num2++)
{
using (stream6
= new Lz4DecompressionStream(new FileStream(path + num2 + ".tmp", FileMode.Open, FileAccess.Read, FileShare.None, 0x100000), true))
{
while (stream6.Read(buffer, 0, buffer.Length) != 0)
{
}
}
}
elapsedMilliseconds = stopwatch.ElapsedMilliseconds;
Console.WriteLine("lz4 read: {0}MB, eslaped {1}ms, avg {2:N1}MB/s",
(length / 0x400L) / 0x400L, elapsedMilliseconds, ((length * 10f) / elapsedMilliseconds) / 1024f);
for (num2 = 0; num2 < 10; num2++)
{
File.Delete(path + num2 + ".tmp");
}
stopwatch = Stopwatch.StartNew();
for (num2 = 0; num2 < 10; num2++)
{
using (stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.None, 0x100000))
{
using (stream5 = new Lz4CompressionStream(new FileStream(path + num2 + ".tmp",
FileMode.Create, FileAccess.Write, FileShare.None, 0x100000), 0x100000, Lz4Mode.HighCompression, true))
{
while ((num3 = stream.Read(buffer, 0, buffer.Length)) != 0)
{
stream5.Write(buffer, 0, num3);
}
}
}
}
elapsedMilliseconds = stopwatch.ElapsedMilliseconds;
num5 = new FileInfo(path).Length / ((float)length);
Console.WriteLine("lz4hc write: {0}MB, eslaped {1}ms, avg {2:N1}MB/s, compress rate {3:P}",
new object[] { (length / 0x400L) / 0x400L, elapsedMilliseconds, ((length * 10f) / elapsedMilliseconds) / 1024f, num5 });
stopwatch = Stopwatch.StartNew();
for (num2 = 0; num2 < 10; num2++)
{
using (stream6 = new Lz4DecompressionStream(new FileStream(path + num2 + ".tmp", FileMode.Open, FileAccess.Read, FileShare.None, 0x100000), true))
{
while (stream6.Read(buffer, 0, buffer.Length) != 0)
{
}
}
}
elapsedMilliseconds = stopwatch.ElapsedMilliseconds;
Console.WriteLine("lz4hc read: {0}MB, eslaped {1}ms, avg {2:N1}MB/s",
(length / 0x400L) / 0x400L, elapsedMilliseconds, ((length * 10f) / elapsedMilliseconds) / 1024f);
for (num2 = 0; num2 < 10; num2++)
{
File.Delete(path + num2 + ".tmp");
}
}