public static void WriteBitCode64(this Stream stream, BitCode64 code)
{
stream.WriteUInt64(code.Code);
byte len = ((byte)code.Length).SetBit(7, code.High);
stream.WriteByte(len);
}
public static int ReadGammaCode(this BitCode64 code)
{
int l2 = code.Length - 1;
if (code.High)
{
return((int)(code.Code >> (63 - l2)) - 1);
}
else
{
return((int)code.Code - 1);
}
}
public static int ReadDeltaCode(this BitCode64 code)
{
int ll = 0;
int i = 63;
UInt64 ucode;
if (code.High)
{
ucode = code.Code;
}
else
{
ucode = code.Code << 64 - code.Length;
}
if (ucode == 0x8000000000000000)
{
return(0);
}
while (!ucode.GetBit(i--))
{
ll++;
}
int l = code.Length - 1 - ll - ll;
ll += ll;
int high = ((int)(ucode >> (63 - ll))) - 1;
int v = 2;
while (--high > 0)
{
v += v;
}
int low = (int)((ucode << (ll + 1)) >> (64 - l));
return(v + low - 1);
}
public static void WriteCode(this IBitStream stream, BitCode64 code)
{
stream.WriteBits(code.Code, code.Length, code.High);
}