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/*
* uzlib - tiny deflate/inflate library (deflate, gzip, zlib)
*
* Copyright (c) 2003 by Joergen Ibsen / Jibz
* All Rights Reserved
* http://www.ibsensoftware.com/
*
* Copyright (c) 2014-2018 by Paul Sokolovsky
*
* Optimised for MicroPython:
* Copyright (c) 2023 by Jim Mussared
*
* 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.
*/
#ifndef UZLIB_H_INCLUDED
#define UZLIB_H_INCLUDED
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include "uzlib_conf.h"
#if UZLIB_CONF_DEBUG_LOG
#include <stdio.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
/* ok status, more data produced */
#define UZLIB_OK 0
/* end of compressed stream reached */
#define UZLIB_DONE 1
#define UZLIB_DATA_ERROR (-3)
#define UZLIB_CHKSUM_ERROR (-4)
#define UZLIB_DICT_ERROR (-5)
/* checksum types */
#define UZLIB_CHKSUM_NONE 0
#define UZLIB_CHKSUM_ADLER 1
#define UZLIB_CHKSUM_CRC 2
/* helper macros */
#define TINF_ARRAY_SIZE(arr) (sizeof(arr) / sizeof(*(arr)))
/* data structures */
typedef struct {
unsigned short table[16]; /* table of code length counts */
unsigned short trans[288]; /* code -> symbol translation table */
} TINF_TREE;
typedef struct _uzlib_uncomp_t {
/* Pointer to the next byte in the input buffer */
const unsigned char *source;
/* Pointer to the next byte past the input buffer (source_limit = source + len) */
const unsigned char *source_limit;
/* If source_limit == NULL, or source >= source_limit, this function
will be used to read next byte from source stream. The function may
also return -1 in case of EOF (or irrecoverable error). Note that
besides returning the next byte, it may also update source and
source_limit fields, thus allowing for buffered operation. */
void *source_read_data;
int (*source_read_cb)(void *);
unsigned int tag;
unsigned int bitcount;
/* Destination (output) buffer start */
unsigned char *dest_start;
/* Current pointer in dest buffer */
unsigned char *dest;
/* Pointer past the end of the dest buffer, similar to source_limit */
unsigned char *dest_limit;
/* Accumulating checksum */
unsigned int checksum;
char checksum_type;
bool eof;
int btype;
int bfinal;
unsigned int curlen;
int lzOff;
unsigned char *dict_ring;
unsigned int dict_size;
unsigned int dict_idx;
TINF_TREE ltree; /* dynamic length/symbol tree */
TINF_TREE dtree; /* dynamic distance tree */
} uzlib_uncomp_t;
#define TINF_PUT(d, c) \
{ \
*d->dest++ = c; \
if (d->dict_ring) { d->dict_ring[d->dict_idx++] = c; if (d->dict_idx == d->dict_size) d->dict_idx = 0; } \
}
unsigned char uzlib_get_byte(uzlib_uncomp_t *d);
/* Decompression API */
void uzlib_uncompress_init(uzlib_uncomp_t *d, void *dict, unsigned int dictLen);
int uzlib_uncompress(uzlib_uncomp_t *d);
int uzlib_uncompress_chksum(uzlib_uncomp_t *d);
#define UZLIB_HEADER_ZLIB 0
#define UZLIB_HEADER_GZIP 1
int uzlib_parse_zlib_gzip_header(uzlib_uncomp_t *d, int *wbits);
/* Compression API */
typedef struct {
void *dest_write_data;
void (*dest_write_cb)(void *data, uint8_t byte);
unsigned long outbits;
int noutbits;
uint8_t *hist_buf;
size_t hist_max;
size_t hist_start;
size_t hist_len;
} uzlib_lz77_state_t;
void uzlib_lz77_init(uzlib_lz77_state_t *state, uint8_t *hist, size_t hist_max);
void uzlib_lz77_compress(uzlib_lz77_state_t *state, const uint8_t *src, unsigned len);
void uzlib_start_block(uzlib_lz77_state_t *state);
void uzlib_finish_block(uzlib_lz77_state_t *state);
/* Checksum API */
/* prev_sum is previous value for incremental computation, 1 initially */
uint32_t uzlib_adler32(const void *data, unsigned int length, uint32_t prev_sum);
/* crc is previous value for incremental computation, 0xffffffff initially */
uint32_t uzlib_crc32(const void *data, unsigned int length, uint32_t crc);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* UZLIB_H_INCLUDED */
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