private void CompressAndWriteClusters(long focusVcn, int count, byte[] buffer, int offset)
{
BlockCompressor compressor = _context.Options.Compressor;
compressor.BlockSize = _bytesPerCluster;
int compressedLength = _ioBuffer.Length;
var result = compressor.Compress(buffer, offset, _attr.CompressionUnitSize * _bytesPerCluster, _ioBuffer, 0, ref compressedLength);
if (result == CompressionResult.AllZeros)
{
_rawStream.ReleaseClusters(focusVcn, count);
}
else if (result == CompressionResult.Compressed && (_attr.CompressionUnitSize * _bytesPerCluster) - compressedLength > _bytesPerCluster)
{
int compClusters = Utilities.Ceil(compressedLength, _bytesPerCluster);
_rawStream.AllocateClusters(focusVcn, compClusters);
_rawStream.WriteClusters(focusVcn, compClusters, _ioBuffer, 0);
_rawStream.ReleaseClusters(focusVcn + compClusters, _attr.CompressionUnitSize - compClusters);
}
else
{
_rawStream.AllocateClusters(focusVcn, _attr.CompressionUnitSize);
_rawStream.WriteClusters(focusVcn, _attr.CompressionUnitSize, buffer, offset);
}
}
private int CompressAndWriteClusters(long focusVcn, int count, byte[] buffer, int offset)
{
BlockCompressor compressor = _context.Options.Compressor;
compressor.BlockSize = _bytesPerCluster;
int totalAllocated = 0;
int compressedLength = _ioBuffer.Length;
CompressionResult result = compressor.Compress(buffer, offset, _attr.CompressionUnitSize * _bytesPerCluster, _ioBuffer, 0,
ref compressedLength);
if (result == CompressionResult.AllZeros)
{
totalAllocated -= _rawStream.ReleaseClusters(focusVcn, count);
}
else if (result == CompressionResult.Compressed &&
_attr.CompressionUnitSize * _bytesPerCluster - compressedLength > _bytesPerCluster)
{
int compClusters = MathUtilities.Ceil(compressedLength, _bytesPerCluster);
totalAllocated += _rawStream.AllocateClusters(focusVcn, compClusters);
totalAllocated += _rawStream.WriteClusters(focusVcn, compClusters, _ioBuffer, 0);
totalAllocated -= _rawStream.ReleaseClusters(focusVcn + compClusters,
_attr.CompressionUnitSize - compClusters);
}
else
{
totalAllocated += _rawStream.AllocateClusters(focusVcn, _attr.CompressionUnitSize);
totalAllocated += _rawStream.WriteClusters(focusVcn, _attr.CompressionUnitSize, buffer, offset);
}
return(totalAllocated);
}
public void Compress1KBlockSize()
{
object instance = typeof(NtfsFileSystem).Assembly.CreateInstance("DiscUtils.Ntfs.LZNT1");
BlockCompressor compressor = (BlockCompressor)instance;
int compressedLength = 16 * 4096;
byte[] compressedData = new byte[compressedLength];
// Double-check, make sure native code round-trips
byte[] nativeCompressed = NativeCompress(_uncompressedData, 0, _uncompressedData.Length, 1024);
Assert.AreEqual(_uncompressedData, NativeDecompress(nativeCompressed, 0, nativeCompressed.Length));
compressor.BlockSize = 1024;
CompressionResult r = compressor.Compress(_uncompressedData, 0, _uncompressedData.Length, compressedData, 0, ref compressedLength);
Assert.AreEqual(CompressionResult.Compressed, r);
byte[] duDecompressed = new byte[_uncompressedData.Length];
int numDuDecompressed = compressor.Decompress(compressedData, 0, compressedLength, duDecompressed, 0);
byte[] rightSizedDuDecompressed = new byte[numDuDecompressed];
Array.Copy(duDecompressed, rightSizedDuDecompressed, numDuDecompressed);
// Note: Due to bug in Windows LZNT1, we compare against native decompression, not the original data, since
// Windows LZNT1 corrupts data on decompression when block size != 4096.
Assert.AreEqual(rightSizedDuDecompressed, NativeDecompress(compressedData, 0, compressedLength));
}
public void CompressAllZeros()
{
object instance = typeof(NtfsFileSystem).Assembly.CreateInstance("DiscUtils.Ntfs.LZNT1");
BlockCompressor compressor = (BlockCompressor)instance;
byte[] compressed = new byte[64 * 1024];
int numCompressed = 64 * 1024;
Assert.AreEqual(CompressionResult.AllZeros, compressor.Compress(new byte[64 * 1024], 0, 64 * 1024, compressed, 0, ref numCompressed));
}
public void CompressionThrowsExceptionWhenImageHasInvalidDimensions()
{
var compressor = new BlockCompressor();
var format = new Mock <IBlockCompressionFormat>();
var bitmap = new Mock <IUncompressedImage>();
bitmap.Setup(b => b.Width).Returns(10);
bitmap.Setup(b => b.Height).Returns(16);
Assert.Throws <InvalidOperationException>(() => compressor.Compress(bitmap.Object, format.Object));
}
public void CompressIncompressible()
{
object instance = typeof(NtfsFileSystem).Assembly.CreateInstance("DiscUtils.Ntfs.LZNT1");
BlockCompressor compressor = (BlockCompressor)instance;
Random rng = new Random(6324);
byte[] uncompressed = new byte[64 * 1024];
rng.NextBytes(uncompressed);
byte[] compressed = new byte[64 * 1024];
int numCompressed = 64 * 1024;
Assert.AreEqual(CompressionResult.Incompressible, compressor.Compress(uncompressed, 0, uncompressed.Length, compressed, 0, ref numCompressed));
}
public void BlockCompressorShouldWorkAsExpected()
{
// Arrange
const int threadsCount = 8;
var strater = MockRepository.GenerateMock<IBlockCompressorStarter>();
strater.Expect(t => t.StartCompress(JobType.Compress)).Repeat.Times(threadsCount);
var compressor = new BlockCompressor(threadsCount, strater);
// Act
compressor.Compress(JobType.Compress);
// Assert
strater.VerifyAllExpectations();
}
public void Compress()
{
object instance = typeof(NtfsFileSystem).Assembly.CreateInstance("DiscUtils.Ntfs.LZNT1");
BlockCompressor compressor = (BlockCompressor)instance;
int compressedLength = 16 * 4096;
byte[] compressedData = new byte[compressedLength];
// Double-check, make sure native code round-trips
byte[] nativeCompressed = NativeCompress(_uncompressedData, 0, _uncompressedData.Length, 4096);
Assert.AreEqual(_uncompressedData, NativeDecompress(nativeCompressed, 0, nativeCompressed.Length));
compressor.BlockSize = 4096;
CompressionResult r = compressor.Compress(_uncompressedData, 0, _uncompressedData.Length, compressedData, 0, ref compressedLength);
Assert.AreEqual(CompressionResult.Compressed, r);
Assert.AreEqual(_uncompressedData, NativeDecompress(compressedData, 0, compressedLength));
Assert.Less(compressedLength, _uncompressedData.Length * 0.66);
}
public void CompressMidDestBuffer()
{
object instance = CreateInstance <NtfsFileSystem>("DiscUtils.Ntfs.LZNT1");
BlockCompressor compressor = (BlockCompressor)instance;
// Double-check, make sure native code round-trips
byte[] nativeCompressed = NativeCompress(_uncompressedData, 0, _uncompressedData.Length, 4096);
Assert.Equal(_uncompressedData, NativeDecompress(nativeCompressed, 0, nativeCompressed.Length));
int compressedLength = 128 * 1024;
byte[] compressedData = new byte[compressedLength];
compressor.BlockSize = 4096;
CompressionResult r = compressor.Compress(_uncompressedData, 0, _uncompressedData.Length, compressedData, 32 * 1024, ref compressedLength);
Assert.Equal(CompressionResult.Compressed, r);
Assert.True(compressedLength < _uncompressedData.Length);
Assert.Equal(_uncompressedData, NativeDecompress(compressedData, 32 * 1024, compressedLength));
}
public void RunsCompressionForEachBlock()
{
const int byteCount = 8;
var format = new Mock <IBlockCompressionFormat>();
format.Setup(f => f.BlockSize).Returns(byteCount);
format.Setup(f => f.Compress(It.IsAny <Color[]>())).Returns(new byte[byteCount]);
var compressor = new BlockCompressor();
compressor.Compress(CreateBitmapMock(), format.Object);
format.Verify(f => f.Compress(It.IsAny <Color[]>()), Times.Exactly(6));
format.Verify(f => f.Compress(It.Is <Color[]>(colors => colors.All(c => c == Red))));
format.Verify(f => f.Compress(It.Is <Color[]>(colors => colors.All(c => c == Green))));
format.Verify(f => f.Compress(It.Is <Color[]>(colors => colors.All(c => c == Blue))));
format.Verify(f => f.Compress(It.Is <Color[]>(colors => colors.All(c => c == White))));
format.Verify(f => f.Compress(It.Is <Color[]>(colors => colors.All(c => c == Black))));
format.Verify(f => f.Compress(It.Is <Color[]>(colors => colors.All(c => c == Gray))));
}
public void Compress1KBlock()
{
object instance = typeof(NtfsFileSystem).Assembly.CreateInstance("DiscUtils.Ntfs.LZNT1");
BlockCompressor compressor = (BlockCompressor)instance;
byte[] uncompressed1K = new byte[1024];
Array.Copy(_uncompressedData, uncompressed1K, 1024);
int compressedLength = 1024;
byte[] compressedData = new byte[compressedLength];
// Double-check, make sure native code round-trips
byte[] nativeCompressed = NativeCompress(uncompressed1K, 0, 1024, 1024);
Assert.AreEqual(uncompressed1K, NativeDecompress(nativeCompressed, 0, nativeCompressed.Length));
compressor.BlockSize = 1024;
CompressionResult r = compressor.Compress(uncompressed1K, 0, 1024, compressedData, 0, ref compressedLength);
Assert.AreEqual(CompressionResult.Compressed, r);
Assert.AreEqual(uncompressed1K, NativeDecompress(compressedData, 0, compressedLength));
}
private void Compress()
{
if (Interlocked.CompareExchange(ref _compressState, 3, 1) != 1)
{
return;
}
_lock.EnterReadLock();
if (_mode == Empty)
{
return;
}
if (_array == null)
{
return;
}
IntervalTree <T> intervalTree = null;
try
{
if (Width == Height)
{
var compressor = new BlockCompressor(Width);
intervalTree = compressor.Compress(_array);
}
else
{
var compressor = new ColumnCompressor(Width, Height);
intervalTree = compressor.Compress(_array);
}
}
catch (Exception e)
{
Debug.LogError(e);
}
finally
{
_lock.ExitReadLock();
}
try
{
if (intervalTree != null && _lock.TryEnterWriteLock(150))
{
_intervalTree = intervalTree;
_mode = Interval;
var temp = _array;
_array = null;
for (var i = 0; i < temp.Length; i++)
{
temp[i] = default(T);
}
PoolManager.GetArrayPool <T[]>(_size).Push(temp);
}
}
catch (Exception e)
{
Debug.LogError(e);
}
finally
{
_lock.ExitWriteLock();
Interlocked.Exchange(ref _lastTouched, DateTime.Now.Ticks);
Interlocked.Exchange(ref _compressState, 0);
}
}