public static CompressResult Compress([NotNull] Stream inputFile, [NotNull] Stream compressFile = null,
int blockSize = 0x100000, Lz4Mode mode = 0, Action <CompressResult> blockCallback = null)
{
long position;
if (inputFile == null)
{
throw new ArgumentNullException(nameof(inputFile));
}
if (compressFile == null)
{
throw new ArgumentNullException(nameof(compressFile));
}
CompressResult result = new CompressResult();
byte[] buffer = new byte[blockSize];
try
{
position = compressFile.Position;
}
catch (Exception)
{
position = -1L;
result.CompressedBytes = -1L;
}
using (Lz4CompressionStream stream = new Lz4CompressionStream(compressFile, 0x100000, mode))
{
goto Label_00E9;
Label_006D:
int num2 = inputFile.Read(buffer, 0, buffer.Length);
if (num2 == 0)
{
return(result);
}
result.Bytes += num2;
stream.Write(buffer, 0, num2);
if (position != -1L)
{
long num3 = compressFile.Position;
result.CompressedBytes += num3 - position;
position = num3;
}
if (blockCallback != null)
{
blockCallback(result);
}
Label_00E9:
goto Label_006D;
}
}
public static CompressResult Compress([NotNull] Stream inputFile, [NotNull] Stream compressFile = null,
int blockSize = 0x100000, Lz4Mode mode = 0, Action<CompressResult> blockCallback = null)
{
long position;
if (inputFile == null)
{
throw new ArgumentNullException("inputFile");
}
if (compressFile == null)
{
throw new ArgumentNullException("compressFile");
}
CompressResult result = new CompressResult();
byte[] buffer = new byte[blockSize];
try
{
position = compressFile.Position;
}
catch (Exception)
{
position = -1L;
result.CompressedBytes = -1L;
}
using (Lz4CompressionStream stream = new Lz4CompressionStream(compressFile, 0x100000, mode))
{
goto Label_00E9;
Label_006D:
int num2 = inputFile.Read(buffer, 0, buffer.Length);
if (num2 == 0)
{
return result;
}
result.Bytes += num2;
stream.Write(buffer, 0, num2);
if (position != -1L)
{
long num3 = compressFile.Position;
result.CompressedBytes += num3 - position;
position = num3;
}
if (blockCallback != null)
{
blockCallback(result);
}
Label_00E9:
goto Label_006D;
}
}
private void AddEntry(Stream stream, Lz4Mode mode, int blockSize, Lz4PackageEntry entry)
{
using (FileStream stream2 = OpenWrite(blockSize))
{
entry.Entry = stream2.Position;
using (Lz4CompressionStream stream3 = new Lz4CompressionStream(stream2, blockSize, mode))
{
int num;
byte[] buffer = new byte[blockSize];
while ((num = stream.Read(buffer, 0, buffer.Length)) > 0)
{
entry.OriginSize += num;
stream3.Write(buffer, 0, num);
}
}
entry.CompressedSize = stream2.Position - entry.Entry;
}
}
private void AddEntry(Stream stream, Lz4Mode mode, int blockSize, Lz4PackageEntry entry)
{
using (FileStream stream2 = OpenWrite(blockSize))
{
entry.Entry = stream2.Position;
using (Lz4CompressionStream stream3 = new Lz4CompressionStream(stream2, blockSize, mode))
{
int num;
byte[] buffer = new byte[blockSize];
while ((num = stream.Read(buffer, 0, buffer.Length)) > 0)
{
entry.OriginSize += num;
stream3.Write(buffer, 0, num);
}
}
entry.CompressedSize = stream2.Position - entry.Entry;
}
}
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));
}
}