circuitpython/extmod/uzlib/tinf.h

118 lines
2.9 KiB
C

/*
* uzlib - tiny deflate/inflate library (deflate, gzip, zlib)
*
* Copyright (c) 2003 by Joergen Ibsen / Jibz
* All Rights Reserved
* http://www.ibsensoftware.com/
*
* Copyright (c) 2014-2016 by Paul Sokolovsky
*/
#ifndef TINF_H_INCLUDED
#define TINF_H_INCLUDED
#include <stdint.h>
/* calling convention */
#ifndef TINFCC
#ifdef __WATCOMC__
#define TINFCC __cdecl
#else
#define TINFCC
#endif
#endif
#ifdef __cplusplus
extern "C" {
#endif
/* ok status, more data produced */
#define TINF_OK 0
/* end of compressed stream reached */
#define TINF_DONE 1
#define TINF_DATA_ERROR (-3)
#define TINF_CHKSUM_ERROR (-4)
#define TINF_DICT_ERROR (-5)
/* checksum types */
#define TINF_CHKSUM_NONE 0
#define TINF_CHKSUM_ADLER 1
#define TINF_CHKSUM_CRC 2
/* data structures */
typedef struct {
unsigned short table[16]; /* table of code length counts */
unsigned short trans[288]; /* code -> symbol translation table */
} TINF_TREE;
struct TINF_DATA;
typedef struct TINF_DATA {
const unsigned char *source;
/* If source above is NULL, this function will be used to read
next byte from source stream */
unsigned char (*readSource)(struct TINF_DATA *data);
unsigned int tag;
unsigned int bitcount;
/* Buffer start */
unsigned char *destStart;
/* Buffer total size */
unsigned int destSize;
/* Current pointer in buffer */
unsigned char *dest;
/* Remaining bytes in buffer */
unsigned int destRemaining;
/* Accumulating checksum */
unsigned int checksum;
char checksum_type;
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 */
} TINF_DATA;
#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 TINFCC uzlib_get_byte(TINF_DATA *d);
/* Decompression API */
void TINFCC uzlib_init(void);
void TINFCC uzlib_uncompress_init(TINF_DATA *d, void *dict, unsigned int dictLen);
int TINFCC uzlib_uncompress(TINF_DATA *d);
int TINFCC uzlib_uncompress_chksum(TINF_DATA *d);
int TINFCC uzlib_zlib_parse_header(TINF_DATA *d);
int TINFCC uzlib_gzip_parse_header(TINF_DATA *d);
/* Compression API */
void TINFCC uzlib_compress(void *data, const uint8_t *src, unsigned slen);
/* Checksum API */
/* prev_sum is previous value for incremental computation, 1 initially */
uint32_t TINFCC uzlib_adler32(const void *data, unsigned int length, uint32_t prev_sum);
/* crc is previous value for incremental computation, 0xffffffff initially */
uint32_t TINFCC uzlib_crc32(const void *data, unsigned int length, uint32_t crc);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* TINF_H_INCLUDED */