Module arithmetic 

Binary Arithmetic Coder — PAQ8-style, 12-bit precision, carry-free.

Encodes/decodes one bit at a time given a 12-bit probability of bit=1. Uses 32-bit range [low, high] with byte-wise normalization.

Probabilities must be in [1, 4095]. 0 and 4096 are forbidden.

Structs

ArithmeticDecoder

Binary arithmetic decoder. Reads bits from compressed data.

ArithmeticEncoder

Binary arithmetic encoder. Accumulates compressed bytes.