/// <summary>
/// If this stream has some input leftover that hasn't been processed then we should
/// check if it is another GZip file concatenated with this one.
///
/// Returns false if the leftover input is another GZip data stream.
/// </summary>
private unsafe bool ResetStreamForLeftoverInput()
{
Debug.Assert(!NeedsInput());
Debug.Assert(IsGzipStream());
Debug.Assert(IsInputBufferHandleAllocated);
lock (SyncLock)
{
IntPtr nextInPtr = _zlibStream.NextIn;
byte * nextInPointer = (byte *)nextInPtr.ToPointer();
uint nextAvailIn = _zlibStream.AvailIn;
// Check the leftover bytes to see if they start with he gzip header ID bytes
if (*nextInPointer != ZLibNative.GZip_Header_ID1 || (nextAvailIn > 1 && *(nextInPointer + 1) != ZLibNative.GZip_Header_ID2))
{
return(true);
}
// Trash our existing zstream.
_zlibStream.Dispose();
// Create a new zstream
InflateInit(_windowBits);
// SetInput on the new stream to the bits remaining from the last stream
_zlibStream.NextIn = nextInPtr;
_zlibStream.AvailIn = nextAvailIn;
_finished = false;
}
return(false);
}
private void Dispose(bool disposing)
{
if (!_isDisposed)
{
if (disposing)
{
_zlibStream.Dispose();
}
_isDisposed = true;
}
}
private void Dispose(bool disposing)
{
if (!_isDisposed)
{
if (disposing)
{
_zlibStream.Dispose();
}
DeallocateInputBufferHandle();
_isDisposed = true;
}
}
protected virtual void Dispose(bool disposing)
{
if (disposing && !_isDisposed)
{
if (_inputBufferHandle.HasValue)
{
DeallocateInputBufferHandle();
}
_zlibStream.Dispose();
_isDisposed = true;
}
}
protected virtual void Dispose(bool disposing)
{
if (!_isDisposed)
{
if (disposing)
{
_zlibStream.Dispose();
}
if (_inputBufferHandle.IsAllocated)
{
DeallocateInputBufferHandle();
}
_isDisposed = true;
}
}
internal Deflater(CompressionLevel compressionLevel, int windowBits)
{
Debug.Assert(windowBits >= minWindowBits && windowBits <= maxWindowBits);
ZLibNative.CompressionLevel zlibCompressionLevel;
int memLevel;
switch (compressionLevel)
{
// See the note in ZLibNative.CompressionLevel for the recommended combinations.
case CompressionLevel.Optimal:
zlibCompressionLevel = ZLibNative.CompressionLevel.DefaultCompression;
memLevel = ZLibNative.Deflate_DefaultMemLevel;
break;
case CompressionLevel.Fastest:
zlibCompressionLevel = ZLibNative.CompressionLevel.BestSpeed;
memLevel = ZLibNative.Deflate_DefaultMemLevel;
break;
case CompressionLevel.NoCompression:
zlibCompressionLevel = ZLibNative.CompressionLevel.NoCompression;
memLevel = ZLibNative.Deflate_NoCompressionMemLevel;
break;
case CompressionLevel.SmallestSize:
zlibCompressionLevel = ZLibNative.CompressionLevel.BestCompression;
memLevel = ZLibNative.Deflate_DefaultMemLevel;
break;
default:
throw new ArgumentOutOfRangeException(nameof(compressionLevel));
}
ZLibNative.CompressionStrategy strategy = ZLibNative.CompressionStrategy.DefaultStrategy;
ZLibNative.ZLibStreamHandle?zlibStream = null;
ZErrorCode errC;
try
{
errC = ZLibNative.CreateZLibStreamForDeflate(out zlibStream, zlibCompressionLevel,
windowBits, memLevel, strategy);
}
catch (Exception cause)
{
zlibStream?.Dispose();
throw new ZLibException(SR.ZLibErrorDLLLoadError, cause);
}
_zlibStream = zlibStream;
switch (errC)
{
case ZErrorCode.Ok:
return;
case ZErrorCode.MemError:
throw new ZLibException(SR.ZLibErrorNotEnoughMemory, "deflateInit2_", (int)errC, _zlibStream.GetErrorMessage());
case ZErrorCode.VersionError:
throw new ZLibException(SR.ZLibErrorVersionMismatch, "deflateInit2_", (int)errC, _zlibStream.GetErrorMessage());
case ZErrorCode.StreamError:
throw new ZLibException(SR.ZLibErrorIncorrectInitParameters, "deflateInit2_", (int)errC, _zlibStream.GetErrorMessage());
default:
throw new ZLibException(SR.ZLibErrorUnexpected, "deflateInit2_", (int)errC, _zlibStream.GetErrorMessage());
}
}
