private static Range GetRange(int start, int end)
{
Range range = new Range(start, end);
range.Length = Codec.GetValidatedSuperCommandSize(range.Length);
return(range);
}
private static void CreateNodesFromCommand(int command, int byteCount, ChunkNodeCollection nodeCollection, int i, ChunkNode parentNode)
{
byteCount = Codec.GetValidatedSuperCommandSize(byteCount);
if (byteCount > Codec.NormalCommandMax)
{
int reducedByteCount = Math.Min(byteCount, Codec.NormalCommandMax);
nodeCollection.Add(i + reducedByteCount, new ChunkNode(parentNode, command, i, reducedByteCount));
}
nodeCollection.Add(i + byteCount, new ChunkNode(parentNode, command, i, byteCount));
}
public Range GetMaxBackRange(int offset)
{
Range maxBackRange = Range.Empty;
byte value = this.buffer[offset];
foreach (int otherOffset in this.byteDictionary[value])
{
if (otherOffset >= offset)
{
break;
}
int iterator = offset;
int backIterator = otherOffset;
do
{
iterator++;
backIterator++;
}while (iterator < this.buffer.Length &&
this.buffer[backIterator] == this.buffer[iterator]);
int start = otherOffset;
int end = backIterator;
Range backRange = new Range(start, end);
backRange.Length = Codec.GetValidatedSuperCommandSize(backRange.Length);
if (backRange.Length >= maxBackRange.Length)
{
maxBackRange = backRange;
}
}
return(maxBackRange);
}
public Range[] GetMaxBackRanges(int offset)
{
Range maxRange4n = Range.Empty; // Command 4 normal
Range maxRange4s = Range.Empty; // Command 4 super
Range maxRange6n = Range.Empty; // Command 6 normal
Range maxRange6s = Range.Empty; // Command 6 super
byte value = this.buffer[offset];
int startPosition = offset - 0xFF;
if (startPosition < 0)
{
startPosition = 0;
}
foreach (int otherOffset in this.byteDictionary[value])
{
if (otherOffset >= offset)
{
break;
}
int iterator = offset;
int backIterator = otherOffset;
do
{
iterator++;
backIterator++;
}while (iterator < this.buffer.Length &&
this.buffer[backIterator] == this.buffer[iterator]);
int start = otherOffset;
int end = backIterator;
Range backRange = new Range(start, end);
backRange.Length = Codec.GetValidatedSuperCommandSize(backRange.Length);
if (otherOffset < startPosition)
{
if (backRange.Length >= maxRange4s.Length)
{
maxRange4s = backRange;
}
}
else
{
if (backRange.Length >= maxRange6s.Length)
{
maxRange6s = backRange;
}
}
}
maxRange6n = maxRange6s;
if (maxRange6n.Length <= Codec.NormalCommandMax)
{
maxRange6s = Range.Empty;
}
else
{
maxRange6n.Length = Codec.NormalCommandMax;
}
maxRange4n = maxRange4s;
if (maxRange4n.Length <= Codec.NormalCommandMax)
{
maxRange4s = Range.Empty;
}
else
{
maxRange4n.Length = Codec.NormalCommandMax;
}
if (maxRange4n.Length == maxRange6n.Length)
{
maxRange4n = Range.Empty;
}
if (maxRange4s.Length == maxRange6s.Length)
{
maxRange4s = Range.Empty;
}
return(new[] { maxRange4n, maxRange4s, maxRange6n, maxRange6s });
}