Module utils 

Helpers and statistics.

CountBitReader and CountBitWriter keep track of the number of bits read or written to a BitRead and BitWrite, respectively, optionally printing on standard error the operations performed on the stream.

DbgBitReader and DbgBitWriter print on standard error all operation beformed by a BitRead or BitWrite.

CodesStats keeps track of the space needed to store a stream of integers using different codes.

It also provides sample_implied_distribution, it is an infinite iterator that returns samples from the implied distribution of a code, and the helper functions and structs we use to implement it:

• FindChangePoints to find, using exponential search, the points where a non decreasing monotonic function changes value.
• get_implied_distribution to calculate the implied distribution of a code.

Re-exports

pub use stats::CodesStats;

pub use stats::CodesStatsWrapper;

Modules

stats

Structs

CountBitReader

A wrapper around a BitRead that keeps track of the number of bits read and optionally prints on standard error the operations performed on the stream.

CountBitWriter

A wrapper around a BitWrite that keeps track of the number of bits written and optionally prints on standard error the operations performed on the stream.

DbgBitReader

A wrapper over a BitRead that report on standard error all operations performed, including all code reads.

DbgBitWriter

A wrapper over a BitWrite that report on standard error all operations performed, including all code writes.

FindChangePoints

Iters the points where the given function change value. This only works for monotonic non decreasing functions.

InfiniteIterator

An infinite iterator that always returns ().

Functions

get_implied_distribution

Given the len function of a code, generates data that allows to sample its implied distribution, i.e. a code-word with length l has probability 2^(-l).

sample_implied_distribution

Returns an infinite iterator of samples from the implied distribution of the given code length function. The function f should be the len function of the code.