private void DeflateInit(ZLibNative.CompressionLevel compressionLevel, int windowBits, int memLevel,
ZLibNative.CompressionStrategy strategy)
{
ZErrorCode errC;
try
{
errC = ZLibNative.CreateZLibStreamForDeflate(out _zlibStream, compressionLevel,
windowBits, memLevel, strategy);
}
catch (Exception cause)
{
throw new ZLibException(SR.ZLibErrorDLLLoadError, cause);
}
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());
}
}
internal static extern ZLibNative.ErrorCode DeflateInit2_(
ref ZLibNative.ZStream stream,
ZLibNative.CompressionLevel level,
ZLibNative.CompressionMethod method,
int windowBits,
int memLevel,
ZLibNative.CompressionStrategy strategy);
private void InflateInit(int windowBits)
{
ZLibNative.ErrorCode error;
try
{
error = ZLibNative.CreateZLibStreamForInflate(out _zlibStream, windowBits);
}
catch (Exception exception) // could not load the ZLib dll
{
throw new ZLibException("SR.ZLibErrorDLLLoadError", exception);
}
switch (error)
{
case ZLibNative.ErrorCode.Ok: // Successful initialization
return;
case ZLibNative.ErrorCode.MemError: // Not enough memory
throw new ZLibException("SR.ZLibErrorNotEnoughMemory", "inflateInit2_", (int)error, _zlibStream.GetErrorMessage());
case ZLibNative.ErrorCode.VersionError: //zlib library is incompatible with the version assumed
throw new ZLibException("SR.ZLibErrorVersionMismatch", "inflateInit2_", (int)error, _zlibStream.GetErrorMessage());
case ZLibNative.ErrorCode.StreamError: // Parameters are invalid
throw new ZLibException("SR.ZLibErrorIncorrectInitParameters", "inflateInit2_", (int)error, _zlibStream.GetErrorMessage());
default:
throw new ZLibException("SR.ZLibErrorUnexpected", "inflateInit2_", (int)error, _zlibStream.GetErrorMessage());
}
}
internal static unsafe ZLibNative.ErrorCode Deflate(ref ZLibNative.ZStream stream, ZLibNative.FlushCode flush)
{
fixed (ZLibNative.ZStream* streamBytes = &stream)
{
byte* pBytes = (byte*)streamBytes;
return (ZLibNative.ErrorCode)deflate(pBytes, (int)flush);
}
}
internal static unsafe ZLibNative.ErrorCode DeflateEnd(ref ZLibNative.ZStream stream)
{
fixed (ZLibNative.ZStream* streamBytes = &stream)
{
byte* pBytes = (byte*)streamBytes;
return (ZLibNative.ErrorCode)deflateEnd(pBytes);
}
}
internal static unsafe ZLibNative.ErrorCode InflateInit2_(
ref ZLibNative.ZStream stream,
int windowBits)
{
fixed (byte* versionString = ZLibVersion)
fixed (ZLibNative.ZStream* streamBytes = &stream)
{
byte* pBytes = (byte*)streamBytes;
return (ZLibNative.ErrorCode)inflateInit2_(pBytes, (int)windowBits, versionString, sizeof(ZLibNative.ZStream));
}
}
internal static unsafe ZLibNative.ErrorCode DeflateInit2_(
ref ZLibNative.ZStream stream,
ZLibNative.CompressionLevel level,
ZLibNative.CompressionMethod method,
int windowBits,
int memLevel,
ZLibNative.CompressionStrategy strategy)
{
fixed (byte* versionString = ZLibVersion)
fixed (ZLibNative.ZStream* streamBytes = &stream)
{
byte* pBytes = (byte*)streamBytes;
return (ZLibNative.ErrorCode)deflateInit2_(pBytes, (int)level, (int)method, (int)windowBits, (int)memLevel, (int)strategy, versionString, sizeof(ZLibNative.ZStream));
}
}
internal static extern ZLibNative.ErrorCode InflateEnd(ref ZLibNative.ZStream stream);
internal static extern ZLibNative.ErrorCode Inflate(ref ZLibNative.ZStream stream, ZLibNative.FlushCode flush);
internal static extern ZLibNative.ErrorCode InflateInit2_(ref ZLibNative.ZStream stream, int windowBits);
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;
default:
throw new ArgumentOutOfRangeException(nameof(compressionLevel));
}
ZLibNative.CompressionStrategy strategy = ZLibNative.CompressionStrategy.DefaultStrategy;
ZErrorCode errC;
try
{
errC = ZLibNative.CreateZLibStreamForDeflate(out _zlibStream, zlibCompressionLevel,
windowBits, memLevel, strategy);
}
catch (Exception cause)
{
throw new ZLibException(SR.ZLibErrorDLLLoadError, cause);
}
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());
}
}
private void DeflateInit(ZLibNative.CompressionLevel compressionLevel, int windowBits, int memLevel,
ZLibNative.CompressionStrategy strategy)
{
ZErrorCode errC;
try
{
errC = ZLibNative.CreateZLibStreamForDeflate(out _zlibStream, compressionLevel,
windowBits, memLevel, strategy);
}
catch (Exception cause)
{
throw new ZLibException(SR.ZLibErrorDLLLoadError, cause);
}
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());
}
}
private ZLibNative.ErrorCode Inflate(ZLibNative.FlushCode flushCode)
{
ZLibNative.ErrorCode errC;
try
{
errC = _zlibStream.Inflate(flushCode);
}
catch (Exception cause) // could not load the Zlib DLL correctly
{
throw new ZLibException(SR.ZLibErrorDLLLoadError, cause);
}
switch (errC)
{
case ZLibNative.ErrorCode.Ok: // progress has been made inflating
case ZLibNative.ErrorCode.StreamEnd: // The end of the input stream has been reached
return errC;
case ZLibNative.ErrorCode.BufError: // No room in the output buffer - inflate() can be called again with more space to continue
return errC;
case ZLibNative.ErrorCode.MemError: // Not enough memory to complete the operation
throw new ZLibException(SR.ZLibErrorNotEnoughMemory, "inflate_", (int)errC, _zlibStream.GetErrorMessage());
case ZLibNative.ErrorCode.DataError: // The input data was corrupted (input stream not conforming to the zlib format or incorrect check value)
throw new InvalidDataException(SR.UnsupportedCompression);
case ZLibNative.ErrorCode.StreamError: //the stream structure was inconsistent (for example if next_in or next_out was NULL),
throw new ZLibException(SR.ZLibErrorInconsistentStream, "inflate_", (int)errC, _zlibStream.GetErrorMessage());
default:
throw new ZLibException(SR.ZLibErrorUnexpected, "inflate_", (int)errC, _zlibStream.GetErrorMessage());
}
}
/// <summary>
/// Wrapper around the ZLib inflate function, configuring the stream appropriately.
/// </summary>
private unsafe ZLibNative.ErrorCode ReadInflateOutput(byte* bufPtr, int length, ZLibNative.FlushCode flushCode, out int bytesRead)
{
lock (SyncLock)
{
_zlibStream.NextOut = (IntPtr)bufPtr;
_zlibStream.AvailOut = (uint)length;
ZLibNative.ErrorCode errC = Inflate(flushCode);
bytesRead = length - (int)_zlibStream.AvailOut;
return errC;
}
}
/// <summary>
/// Translates the given byte array to a GCHandle so that it can be passed to the ZLib
/// Inflate function, then returns the result of that call.
/// </summary>
private unsafe ZLibNative.ErrorCode ReadInflateOutput(byte[] outputBuffer, int offset, int length, ZLibNative.FlushCode flushCode, out int bytesRead)
{
lock (_syncLock)
{
fixed (byte* bufPtr = outputBuffer)
{
_zlibStream.NextOut = (IntPtr)bufPtr + offset;
_zlibStream.AvailOut = (uint)length;
ZLibNative.ErrorCode errC = Inflate(flushCode);
bytesRead = length - (int)_zlibStream.AvailOut;
return errC;
}
}
}
/// <summary>
/// Throw exception based on ZLib error code
/// </summary>
/// <param name="retVal"></param>
private static void ThrowIfZLibError(ZLibNative.ErrorCode retVal)
{
// switch does not support fall-through
bool invalidOperation = false;
bool corruption = false;
switch (retVal)
{
case ZLibNative.ErrorCode.Ok:
return;
case ZLibNative.ErrorCode.StreamEnd:
invalidOperation = true; break;
case ZLibNative.ErrorCode.NeedDictionary:
corruption = true; break;
case ZLibNative.ErrorCode.StreamError:
corruption = true; break;
case ZLibNative.ErrorCode.DataError:
corruption = true; break;
case ZLibNative.ErrorCode.MemError:
throw new OutOfMemoryException();
case ZLibNative.ErrorCode.BufError:
invalidOperation = true; break;
case ZLibNative.ErrorCode.VersionError:
throw new InvalidOperationException(SR.Get(SRID.ZLibVersionError,
ZLibNative.ZLibVersion));
default:
{
// ErrorNo
throw new IOException();
}
}
if (invalidOperation)
throw new InvalidOperationException();
if (corruption)
throw new FileFormatException(SR.Get(SRID.CorruptStream));
}
