VCDiffResult DecodeRun(int size, ByteBuffer addRun)
{
if (addRun.Position + 1 > addRun.Length)
{
return(VCDiffResult.EOD);
}
if (!addRun.CanRead)
{
return(VCDiffResult.EOD);
}
byte b = addRun.ReadByte();
for (int i = 0; i < size; i++)
{
sout.writeByte(b);
targetData.Add(b);
}
decodedOnly += size;
return(VCDiffResult.SUCCESS);
}
public void Output(ByteStreamWriter sout)
{
int lengthOfDelta = CalculateLengthOfTheDeltaEncoding();
int windowSize = lengthOfDelta +
1 +
VarIntBE.CalcInt32Length((int)dictionarySize) +
VarIntBE.CalcInt32Length(0);
VarIntBE.CalcInt32Length(lengthOfDelta);
//Google's Checksum Implementation Support
if (hasChecksum)
{
sout.writeByte((byte)VCDiffWindowFlags.VCDSOURCE | (byte)VCDiffWindowFlags.VCDCHECKSUM); //win indicator
}
else
{
sout.writeByte((byte)VCDiffWindowFlags.VCDSOURCE); //win indicator
}
VarIntBE.AppendInt32((int)dictionarySize, sout); //dictionary size
VarIntBE.AppendInt32(0, sout); //dictionary start position 0 is default aka encompass the whole dictionary
VarIntBE.AppendInt32(lengthOfDelta, sout); //length of delta
//begin of delta encoding
Int64 sizeBeforeDelta = sout.Position;
VarIntBE.AppendInt32((int)targetLength, sout); //final target length after decoding
sout.writeByte(0x00); //uncompressed
// [Here is where a secondary compressor would be used
// if the encoder and decoder supported that feature.]
//non interleaved then it is separata areas for each type
if (!interleaved)
{
VarIntBE.AppendInt32(dataForAddAndRun.Count, sout); //length of add/run
VarIntBE.AppendInt32(instructionAndSizes.Count, sout); //length of instructions and sizes
VarIntBE.AppendInt32(addressForCopy.Count, sout); //length of addresses for copys
//Google Checksum Support
if (hasChecksum)
{
VarIntBE.AppendInt64(checksum, sout);
}
sout.writeBytes(dataForAddAndRun.ToArray()); //data section for adds and runs
sout.writeBytes(instructionAndSizes.ToArray()); //data for instructions and sizes
sout.writeBytes(addressForCopy.ToArray()); //data for addresses section copys
}
else
{
//interleaved everything is woven in and out in one block
VarIntBE.AppendInt32(0, sout); //length of add/run
VarIntBE.AppendInt32(instructionAndSizes.Count, sout); //length of instructions and sizes + other data for interleaved
VarIntBE.AppendInt32(0, sout); //length of addresses for copys
//Google Checksum Support
if (hasChecksum)
{
VarIntBE.AppendInt64(checksum, sout);
}
sout.writeBytes(instructionAndSizes.ToArray()); //data for instructions and sizes, in interleaved it is everything
}
//end of delta encoding
Int64 sizeAfterDelta = sout.Position;
if (lengthOfDelta != sizeAfterDelta - sizeBeforeDelta)
{
Console.WriteLine("Delta output length does not match");
}
dataForAddAndRun.Clear();
instructionAndSizes.Clear();
addressForCopy.Clear();
if (targetLength == 0)
{
Console.WriteLine("Empty target window");
}
addrCache = new AddressCache();
}
