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/*
* shrink.h - compressor definitions
*
* Copyright (C) 2019 Emmanuel Marty
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
/*
* Uses the libdivsufsort library Copyright (c) 2003-2008 Yuta Mori
*
* Inspired by cap by Sven-�ke Dahl. https://github.com/svendahl/cap
* Also inspired by Charles Bloom's compression blog. http://cbloomrants.blogspot.com/
* With ideas from LZ4 by Yann Collet. https://github.com/lz4/lz4
* With help and support from spke <zxintrospec@gmail.com>
*
*/
#ifndef _SHRINK_H
#define _SHRINK_H
#include "divsufsort.h"
#ifdef __cplusplus
extern "C" {
#endif
#define LCP_BITS 15
#define TAG_BITS 4
#define LCP_MAX ((1U<<(LCP_BITS - TAG_BITS)) - 1)
#define LCP_AND_TAG_MAX ((1U<<LCP_BITS) - 1)
#define LCP_SHIFT (63-LCP_BITS)
#define LCP_MASK (((1ULL<<LCP_BITS) - 1) << LCP_SHIFT)
#define POS_MASK ((1ULL<<LCP_SHIFT) - 1)
#define VISITED_FLAG 0x8000000000000000ULL
#define EXCL_VISITED_MASK 0x7fffffffffffffffULL
#define NMATCHES_PER_ARRIVAL 24
#define NMATCHES_PER_ARRIVAL_SMALL 9
#define NMATCHES_PER_INDEX 64
#define MATCHES_PER_INDEX_SHIFT 6
#define LEAVE_ALONE_MATCH_SIZE 120
/** One match option */
typedef struct _apultra_match {
unsigned int length:11;
unsigned int offset:21;
} apultra_match;
/** One finalized match */
typedef struct _apultra_final_match {
int length;
int offset;
} apultra_final_match;
/** Forward arrival slot */
typedef struct {
int cost;
unsigned int from_pos:21;
int from_slot:8;
unsigned int follows_literal:1;
unsigned int rep_offset;
unsigned int rep_pos;
int score;
unsigned int match_offset:21;
unsigned int match_len:11;
} apultra_arrival;
/** Compression statistics */
typedef struct _apultra_stats {
int num_literals;
int num_4bit_matches;
int num_7bit_matches;
int num_variable_matches;
int num_rep_matches;
int min_offset;
int max_offset;
long long total_offsets;
int min_match_len;
int max_match_len;
int total_match_lens;
int min_rle1_len;
int max_rle1_len;
int total_rle1_lens;
int min_rle2_len;
int max_rle2_len;
int total_rle2_lens;
int commands_divisor;
int match_divisor;
int rle1_divisor;
int rle2_divisor;
} apultra_stats;
/** Compression context */
typedef struct _apultra_compressor {
divsufsort_ctx_t divsufsort_context;
unsigned long long *intervals;
unsigned long long *pos_data;
unsigned long long *open_intervals;
apultra_match *match;
unsigned short *match_depth;
unsigned char *match1;
apultra_final_match *best_match;
apultra_arrival *arrival;
int flags;
int block_size;
apultra_stats stats;
} apultra_compressor;
/** Compression flags */
#define APULTRA_FLAG_ENHANCED 1 /**< Use enhanced (incompatible) format */
/**
* Get maximum compressed size of input(source) data
*
* @param nInputSize input(source) size in bytes
*
* @return maximum compressed size
*/
size_t apultra_get_max_compressed_size(size_t nInputSize);
/**
* Compress memory
*
* @param pInputData pointer to input(source) data to compress
* @param pOutBuffer buffer for compressed data
* @param nInputSize input(source) size in bytes
* @param nMaxOutBufferSize maximum capacity of compression buffer
* @param nFlags compression flags (a bitmask of APULTRA_FLAG_xxx, or 0)
* @param progress progress function, called after compressing each block, or NULL for none
* @param pStats pointer to compression stats that are filled if this function is successful, or NULL
* @param nMaxWindowSize maximum window size to use (0 for default)
*
* @return actual compressed size, or -1 for error
*/
size_t apultra_compress(const unsigned char *pInputData, unsigned char *pOutBuffer, size_t nInputSize, size_t nMaxOutBufferSize,
const unsigned int nFlags, size_t nMaxWindowSize, void(*progress)(long long nOriginalSize, long long nCompressedSize), apultra_stats *pStats);
#ifdef __cplusplus
}
#endif
#endif /* _SHRINK_H */
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