internal DeflaterManaged()
{
this.deflateEncoder = new FastEncoder();
this.copyEncoder = new CopyEncoder();
this.input = new DeflateInput();
this.output = new OutputBuffer();
this.processingState = DeflaterManaged.DeflaterState.NotStarted;
}
void IDeflater.SetInput(byte[] inputBuffer, int startIndex, int count)
{
Debug.Assert(this.input.Count == 0, "We have something left in previous input!");
this.input.Buffer = inputBuffer;
this.input.Count = count;
this.input.StartIndex = startIndex;
if (count <= 0 || count >= 256)
{
return;
}
switch (this.processingState)
{
case DeflaterManaged.DeflaterState.NotStarted:
case DeflaterManaged.DeflaterState.CheckingForIncompressible:
this.processingState = DeflaterManaged.DeflaterState.StartingSmallData;
break;
case DeflaterManaged.DeflaterState.CompressThenCheck:
this.processingState = DeflaterManaged.DeflaterState.HandlingSmallData;
break;
}
}
void IDeflater.SetInput(byte[] inputBuffer, int startIndex, int count)
{
this.input.Buffer = inputBuffer;
this.input.Count = count;
this.input.StartIndex = startIndex;
if (count > 0 && count < 256)
{
DeflaterManaged.DeflaterState deflaterState = this.processingState;
if (deflaterState != DeflaterManaged.DeflaterState.NotStarted)
{
if (deflaterState == DeflaterManaged.DeflaterState.CompressThenCheck)
{
this.processingState = DeflaterManaged.DeflaterState.HandlingSmallData;
return;
}
if (deflaterState != DeflaterManaged.DeflaterState.CheckingForIncompressible)
{
return;
}
}
this.processingState = DeflaterManaged.DeflaterState.StartingSmallData;
return;
}
}
int IDeflater.GetDeflateOutput(byte[] outputBuffer)
{
Debug.Assert(outputBuffer != null, "Can't pass in a null output buffer!");
Debug.Assert(!this.NeedsInput(), "GetDeflateOutput should only be called after providing input");
this.output.UpdateBuffer(outputBuffer);
switch (this.processingState)
{
case DeflaterManaged.DeflaterState.NotStarted:
Debug.Assert(this.deflateEncoder.BytesInHistory == 0, "have leftover bytes in window");
DeflateInput.InputState state1 = this.input.DumpState();
OutputBuffer.BufferState state2 = this.output.DumpState();
this.deflateEncoder.GetBlockHeader(this.output);
this.deflateEncoder.GetCompressedData(this.input, this.output);
if (!this.UseCompressed(this.deflateEncoder.LastCompressionRatio))
{
this.input.RestoreState(state1);
this.output.RestoreState(state2);
this.copyEncoder.GetBlock(this.input, this.output, false);
this.FlushInputWindows();
this.processingState = DeflaterManaged.DeflaterState.CheckingForIncompressible;
break;
}
this.processingState = DeflaterManaged.DeflaterState.CompressThenCheck;
break;
case DeflaterManaged.DeflaterState.SlowDownForIncompressible1:
this.deflateEncoder.GetBlockFooter(this.output);
this.processingState = DeflaterManaged.DeflaterState.SlowDownForIncompressible2;
goto case DeflaterManaged.DeflaterState.SlowDownForIncompressible2;
case DeflaterManaged.DeflaterState.SlowDownForIncompressible2:
if (this.inputFromHistory.Count > 0)
{
this.copyEncoder.GetBlock(this.inputFromHistory, this.output, false);
}
if (this.inputFromHistory.Count == 0)
{
this.deflateEncoder.FlushInput();
this.processingState = DeflaterManaged.DeflaterState.CheckingForIncompressible;
break;
}
break;
case DeflaterManaged.DeflaterState.StartingSmallData:
this.deflateEncoder.GetBlockHeader(this.output);
this.processingState = DeflaterManaged.DeflaterState.HandlingSmallData;
goto case DeflaterManaged.DeflaterState.HandlingSmallData;
case DeflaterManaged.DeflaterState.CompressThenCheck:
this.deflateEncoder.GetCompressedData(this.input, this.output);
if (!this.UseCompressed(this.deflateEncoder.LastCompressionRatio))
{
this.processingState = DeflaterManaged.DeflaterState.SlowDownForIncompressible1;
this.inputFromHistory = this.deflateEncoder.UnprocessedInput;
break;
}
break;
case DeflaterManaged.DeflaterState.CheckingForIncompressible:
Debug.Assert(this.deflateEncoder.BytesInHistory == 0, "have leftover bytes in window");
DeflateInput.InputState state3 = this.input.DumpState();
OutputBuffer.BufferState state4 = this.output.DumpState();
this.deflateEncoder.GetBlock(this.input, this.output, 8072);
if (!this.UseCompressed(this.deflateEncoder.LastCompressionRatio))
{
this.input.RestoreState(state3);
this.output.RestoreState(state4);
this.copyEncoder.GetBlock(this.input, this.output, false);
this.FlushInputWindows();
break;
}
break;
case DeflaterManaged.DeflaterState.HandlingSmallData:
this.deflateEncoder.GetCompressedData(this.input, this.output);
break;
}
return(this.output.BytesWritten);
}
int IDeflater.GetDeflateOutput(byte[] outputBuffer)
{
this.output.UpdateBuffer(outputBuffer);
switch (this.processingState)
{
case DeflaterManaged.DeflaterState.NotStarted:
{
DeflateInput.InputState state = this.input.DumpState();
OutputBuffer.BufferState state2 = this.output.DumpState();
this.deflateEncoder.GetBlockHeader(this.output);
this.deflateEncoder.GetCompressedData(this.input, this.output);
if (!this.UseCompressed(this.deflateEncoder.LastCompressionRatio))
{
this.input.RestoreState(state);
this.output.RestoreState(state2);
this.copyEncoder.GetBlock(this.input, this.output, false);
this.FlushInputWindows();
this.processingState = DeflaterManaged.DeflaterState.CheckingForIncompressible;
goto IL_23A;
}
this.processingState = DeflaterManaged.DeflaterState.CompressThenCheck;
goto IL_23A;
}
case DeflaterManaged.DeflaterState.SlowDownForIncompressible1:
this.deflateEncoder.GetBlockFooter(this.output);
this.processingState = DeflaterManaged.DeflaterState.SlowDownForIncompressible2;
break;
case DeflaterManaged.DeflaterState.SlowDownForIncompressible2:
break;
case DeflaterManaged.DeflaterState.StartingSmallData:
this.deflateEncoder.GetBlockHeader(this.output);
this.processingState = DeflaterManaged.DeflaterState.HandlingSmallData;
goto IL_223;
case DeflaterManaged.DeflaterState.CompressThenCheck:
this.deflateEncoder.GetCompressedData(this.input, this.output);
if (!this.UseCompressed(this.deflateEncoder.LastCompressionRatio))
{
this.processingState = DeflaterManaged.DeflaterState.SlowDownForIncompressible1;
this.inputFromHistory = this.deflateEncoder.UnprocessedInput;
goto IL_23A;
}
goto IL_23A;
case DeflaterManaged.DeflaterState.CheckingForIncompressible:
{
DeflateInput.InputState state3 = this.input.DumpState();
OutputBuffer.BufferState state4 = this.output.DumpState();
this.deflateEncoder.GetBlock(this.input, this.output, 8072);
if (!this.UseCompressed(this.deflateEncoder.LastCompressionRatio))
{
this.input.RestoreState(state3);
this.output.RestoreState(state4);
this.copyEncoder.GetBlock(this.input, this.output, false);
this.FlushInputWindows();
goto IL_23A;
}
goto IL_23A;
}
case DeflaterManaged.DeflaterState.HandlingSmallData:
goto IL_223;
default:
goto IL_23A;
}
if (this.inputFromHistory.Count > 0)
{
this.copyEncoder.GetBlock(this.inputFromHistory, this.output, false);
}
if (this.inputFromHistory.Count == 0)
{
this.deflateEncoder.FlushInput();
this.processingState = DeflaterManaged.DeflaterState.CheckingForIncompressible;
goto IL_23A;
}
goto IL_23A;
IL_223:
this.deflateEncoder.GetCompressedData(this.input, this.output);
IL_23A:
return(this.output.BytesWritten);
}
