public Block(int index, short exponent, byte nb, bool isSignNegative, long biggestNumber, Blockfinding.Blockfinding context, Blockfinding.Blockfinding.Methods method, bool hasPattern)
{
Index = index;
HasExponent = exponent != 0;
HasPattern = hasPattern;
Pattern = PatternType.Same;
Method = context.GetInitializedMethod(method);
Exponent = exponent;
NeededBits = nb;
AbsoluteSign = true;
IsSignNegative = isSignNegative;
BiggestNumber = biggestNumber;
OverrideGlobalNb = false;
Length = 0;
}
private void PostCompressionOptimisation()
{
// creating huffman data now so we can leave out values that are in a block ;)
// results in better speed + more accuracy
#region calculating huffman data
var currentBlockIndex = 0;
var valueCount = Values.Count;
var blockCount = Blocks.Count;
var nextStop = blockCount == 0 ? valueCount : Blocks[currentBlockIndex].Index;
var currentBlockLength = blockCount == 0 ? 0 : Blocks[currentBlockIndex].Length;
var totalBlockValues = currentBlockLength;
//if (!Metadata.NoExponent)
//{
// _huffman = new HuffmanCreator((ushort)Math.Pow(2, 10));
// var huffIndex = 0;
// while (huffIndex < valueCount)
// {
// for (; huffIndex < nextStop; huffIndex++)
// {
// _huffman.AddOccurence(Values[huffIndex].Exponent);
// }
// if (++currentBlockIndex >= Blocks.Count)
// nextStop = valueCount;
// else
// {
// huffIndex += currentBlockLength;
// nextStop = Blocks[currentBlockIndex].Index;
// currentBlockLength = Blocks[currentBlockIndex].Length;
// totalBlockValues += currentBlockLength;
// }
// }
//}
_totalPostCompressionOptimisationBlockValues = totalBlockValues;
#endregion
#region putting multiple "pattern same" blocks to one pingpong block
if (Blocks.Count == 0)
{
return;
}
var ppp = (PatternPingPongCompression)_blockfinding.GetInitializedMethod(Blockfinding.Blockfinding.Methods.PatternPingPong);
var recentBlock = Blocks[0];
byte lastppLength = 0;
for (var i = 1; i < Blocks.Count; i++)
{
var currentBlock = Blocks[i];
if (currentBlock.HasPattern && currentBlock.Pattern == Block.PatternType.Same && recentBlock.HasPattern)
{
if (recentBlock.Pattern == Block.PatternType.Pingpong && lastppLength * recentBlock.Length + recentBlock.Index == currentBlock.Index)
{
var initValue = Values[currentBlock.Index];
var recentBlockRealLength = lastppLength * recentBlock.Length;
if (currentBlock.Length != lastppLength || initValue.Number == Values[recentBlock.Index + recentBlockRealLength - 1].Number || initValue.Number != Values[recentBlock.Index + recentBlockRealLength - 1 - lastppLength].Number)
{
continue;
}
recentBlock.Length++;
Blocks[i - 1] = recentBlock;
Blocks.RemoveAt(i--);
}
else if (recentBlock.Pattern == Block.PatternType.Same && recentBlock.Index + recentBlock.Length == currentBlock.Index && currentBlock.Length == recentBlock.Length)
{
recentBlock.Pattern = Block.PatternType.Pingpong;
recentBlock.Method = ppp;
ppp.PingPongPatternLengths.Add(new PatternPingPongCompression.PatternPingPongMetadata(recentBlock.Length, recentBlock.Index));
lastppLength = recentBlock.Length;
recentBlock.Length = 2;
Blocks[i - 1] = recentBlock;
Blocks.RemoveAt(i--);
}
else
{
recentBlock = currentBlock;
}
}
}
#endregion
}
