private static ReadBuffer UnpackVLE(ReadBuffer packedData)
{
var widthsCount = packedData[0];
var widths = packedData.Slice(1, widthsCount);
var alphabetCount = widths.Select(val => (int)val).Sum();
var alphabet = packedData.Slice(1 + widthsCount, alphabetCount);
var dictionary = new HuffmanTree(widths, alphabet);
var stream = EnumerateBits(packedData.Drop(1 + widthsCount + alphabetCount));
var result = new WriteBuffer();
while (true)
{
int value = dictionary.DecodeByte(stream);
if (value < 0)
{
break;
}
result.Append((byte)value);
}
return(result.ToReadBuffer());
}
