Huffman coding

From ioquake3 wiki

ioquake3 compresses all of its messages using Huffman coding to save bandwidth. The = function uses = and = to compress data as a message is composed. These functions use a static coding tree that is seeded by =. The contents of the tree is defined in Template:VarDoc, which is presumably tuned to compress typical message data as efficiently as possible.

The = function uses = to compress an entire message at once. This function uses adaptive Huffman coding, where every message starts with an empty coding tree.