private bool DecodeDynamicBlockHeader()
{
switch (this.state)
{
case DeflateDecompressor.DecompressorState.ReadingNumLitCodes:
this.literalLengthCodeCount = this.input.GetBits(5);
if (this.literalLengthCodeCount < 0)
{
return(false);
}
this.literalLengthCodeCount += 257;
this.state = DeflateDecompressor.DecompressorState.ReadingNumDistCodes;
goto case DeflateDecompressor.DecompressorState.ReadingNumDistCodes;
case DeflateDecompressor.DecompressorState.ReadingNumDistCodes:
this.distanceCodeCount = this.input.GetBits(5);
if (this.distanceCodeCount < 0)
{
return(false);
}
++this.distanceCodeCount;
this.state = DeflateDecompressor.DecompressorState.ReadingNumCodeLengthCodes;
goto case DeflateDecompressor.DecompressorState.ReadingNumCodeLengthCodes;
case DeflateDecompressor.DecompressorState.ReadingNumCodeLengthCodes:
this.codeLengthCodeCount = this.input.GetBits(4);
if (this.codeLengthCodeCount < 0)
{
return(false);
}
this.codeLengthCodeCount += 4;
this.loopCounter = 0;
this.state = DeflateDecompressor.DecompressorState.ReadingCodeLengthCodes;
goto case DeflateDecompressor.DecompressorState.ReadingCodeLengthCodes;
case DeflateDecompressor.DecompressorState.ReadingCodeLengthCodes:
if (!this.DecodeDynamicCodes())
{
return(false);
}
this.state = DeflateDecompressor.DecompressorState.ReadingTreeCodesBefore;
goto case DeflateDecompressor.DecompressorState.ReadingTreeCodesBefore;
case DeflateDecompressor.DecompressorState.ReadingTreeCodesBefore:
case DeflateDecompressor.DecompressorState.ReadingTreeCodesAfter:
return(this.ReadTreeCodes());
default:
DeflateDecompressor.ThrowUnknownState();
return(true);
}
}
private bool DecodeBlock(out bool endOfBlock)
{
int freeBytes = this.output.FreeBytes;
endOfBlock = false;
while (freeBytes > 258)
{
switch (this.state)
{
case DeflateDecompressor.DecompressorState.DecodeTop:
bool?nullable1 = this.DecodeTop(ref endOfBlock, ref freeBytes);
if (nullable1.HasValue)
{
return(nullable1.Value);
}
continue;
case DeflateDecompressor.DecompressorState.HaveInitialLength:
bool?nullable2 = this.DecodeInitialLength();
if (nullable2.HasValue)
{
return(nullable2.Value);
}
continue;
case DeflateDecompressor.DecompressorState.HaveFullLength:
bool?nullable3 = this.DecodeFullLength();
if (nullable3.HasValue)
{
return(nullable3.Value);
}
continue;
case DeflateDecompressor.DecompressorState.HaveDistCode:
bool?nullable4 = this.DecodeDistanceCode(ref freeBytes);
if (nullable4.HasValue)
{
return(nullable4.Value);
}
continue;
default:
DeflateDecompressor.ThrowUnknownState();
continue;
}
}
return(true);
}
private bool DecodeUncompressedBlock(out bool endOfBlock)
{
endOfBlock = false;
while (this.state != DeflateDecompressor.DecompressorState.DecodingUncompressed)
{
switch (this.state)
{
case DeflateDecompressor.DecompressorState.UncompressedAligning:
this.input.SkipToByteBoundary();
this.state = DeflateDecompressor.DecompressorState.UncompressedByte1;
continue;
case DeflateDecompressor.DecompressorState.UncompressedByte1:
case DeflateDecompressor.DecompressorState.UncompressedByte2:
case DeflateDecompressor.DecompressorState.UncompressedByte3:
case DeflateDecompressor.DecompressorState.UncompressedByte4:
if (!this.DecodeBits())
{
return(false);
}
continue;
default:
DeflateDecompressor.ThrowUnknownState();
continue;
}
}
this.blockLength -= this.output.ReadInput(this.input, this.blockLength);
if (this.blockLength != 0)
{
return(this.output.FreeBytes == 0);
}
this.state = DeflateDecompressor.DecompressorState.ReadingBFinal;
endOfBlock = true;
return(true);
}
