// Reference source:
// https://github.com/facebookarchive/RakNet/blob/1a169895a900c9fc4841c556e16514182b75faf8/Source/BitStream.cpp#L489
public static void WriteCompressed(this PacketBuilder builder, byte[] inByteArray, bool unsignedData)
{
uint size = (uint)inByteArray.Length * 8;
uint currentByte = (size >> 3) - 1; // PCs
byte byteMatch;
if (unsignedData)
{
byteMatch = 0;
}
else
{
byteMatch = 0xFF;
}
// Write upper bytes with a single 1
// From high byte to low byte, if high byte is a byteMatch then write a 1 bit. Otherwise write a 0 bit and then write the remaining bytes
while (currentByte > 0)
{
if (inByteArray[currentByte] == byteMatch) // If high byte is byteMatch (0 of 0xff) then it would have the same value shifted
{
builder.Write(true);
}
else
{
// Write the remainder of the data after writing 0
builder.Write(false);
builder.WriteBytesCapped(inByteArray, (int)((currentByte + 1) << 3));
// currentByte--;
return;
}
currentByte--;
}
// If the upper half of the last byte is a 0 (positive) or 16 (negative) then write a 1 and the remaining 4 bits. Otherwise write a 0 and the 8 bites.
if ((unsignedData && (inByteArray[currentByte] & 0xF0) == 0x00) ||
(unsignedData == false && (inByteArray[currentByte] & 0xF0) == 0xF0))
{
builder.Write(true);
builder.WriteCapped(inByteArray[currentByte], 4);
}
else
{
builder.Write(false);
builder.WriteCapped(inByteArray[currentByte], 8);
}
}