public static List <LZNT1_Data> GenerateFromLZ77Match(byte[] arg, LZ77Match match, ref int processedBytes)
{
var result = new List <LZNT1_Data>();
int remainingLength = match.Length;
while (remainingLength >= 3)
{
var compressedWord = new LZNT1_CompressedWord();
int displacementBits = GetDisplcaementBits(processedBytes);
int maximumLength = GetMaximumLength(processedBytes);
int length = Math.Min(remainingLength, maximumLength);
compressedWord.Value = 0;
compressedWord.Value |= (length - 3) & ((1 << (16 - displacementBits)) - 1);
compressedWord.Value |= ((match.Distance - 1) & ((1 << displacementBits) - 1)) << (16 - displacementBits);
result.Add(compressedWord);
processedBytes += length;
remainingLength -= length;
}
for (int i = 0; i < remainingLength; i++)
{
var literal = new LZNT1_Literal();
literal.Literal = arg[processedBytes - match.Distance];
result.Add(literal);
processedBytes++;
}
return(result);
}
public static LZNT1_Literal GenerateFromLZ77Literal(LZ77Literal literal, ref int processedBytes)
{
var result = new LZNT1_Literal();
result.Literal = literal.Literal;
processedBytes++;
return(result);
}
public override object Unmarshal(LittleEndianByteBuffer buffer, ref int offset)
{
var result = new LZNT1_Literal();
result.Literal = (byte)buffer.ReadBytes(offset, 1);
offset++;
return(result);
}
public static List <LZNT1_Data> GenerateFromLZ77Symbol(byte[] arg, LZ77Symbol symbol, ref int processedBytes)
{
var result = new List <LZNT1_Data>();
if (symbol is LZ77Literal)
{
var literal = symbol as LZ77Literal;
result.Add(LZNT1_Literal.GenerateFromLZ77Literal(literal, ref processedBytes));
}
else if (symbol is LZ77Match)
{
var match = symbol as LZ77Match;
result.AddRange(LZNT1_CompressedWord.GenerateFromLZ77Match(arg, match, ref processedBytes));
}
else if (symbol is LZ77EOF)
{
// do nothing to EOF.
}
else
{
throw new XcaException("Unreachable code!");
}
return(result);
}