huffman.h

/*
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*/
/// \file huffman.h
/// Data structures and functions for huffman coding.

#ifndef _MPCDEC_HUFFMAN_H_
#define _MPCDEC_HUFFMAN_H_
#ifdef WIN32
#pragma once
#endif

#include <mpc/mpc_types.h>

#ifdef __cplusplus
extern "C" {
#endif

// LUT size parameter, LUT size is 1 << LUT_DEPTH
#define LUT_DEPTH 6

/// Huffman table entry.
typedef struct mpc_huffman_t {
    mpc_uint16_t  Code;
    mpc_uint8_t  Length;
    mpc_int8_t   Value;
} mpc_huffman;

/// Huffman LUT entry.
typedef struct mpc_huff_lut_t {
	mpc_uint8_t  Length;
	mpc_int8_t   Value;
} mpc_huff_lut;

/// Type used for huffman LUT decoding
typedef struct mpc_lut_data_t {
	mpc_huffman const * const table;
	mpc_huff_lut lut[1 << LUT_DEPTH];
} mpc_lut_data;

/// Type used for canonical huffman decoding
typedef struct mpc_can_data_t {
	mpc_huffman const * const table;
	mpc_int8_t const * const sym;
	mpc_huff_lut lut[1 << LUT_DEPTH];
} mpc_can_data;

void huff_init_lut(const int bits);

#ifdef __cplusplus
}
#endif
#endif