mirror of https://github.com/ArduPilot/ardupilot
131 lines
3.4 KiB
C
131 lines
3.4 KiB
C
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/*
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* uzlib - tiny deflate/inflate library (deflate, gzip, zlib)
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*
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* Copyright (c) 2003 by Joergen Ibsen / Jibz
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* All Rights Reserved
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* http://www.ibsensoftware.com/
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*
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* Copyright (c) 2014-2016 by Paul Sokolovsky
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*/
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#ifndef TINF_H_INCLUDED
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#define TINF_H_INCLUDED
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdbool.h>
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/* calling convention */
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#ifndef TINFCC
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#ifdef __WATCOMC__
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#define TINFCC __cdecl
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#else
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#define TINFCC
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#endif
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* ok status, more data produced */
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#define TINF_OK 0
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/* end of compressed stream reached */
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#define TINF_DONE 1
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#define TINF_DATA_ERROR (-3)
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#define TINF_CHKSUM_ERROR (-4)
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#define TINF_DICT_ERROR (-5)
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/* checksum types */
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#define TINF_CHKSUM_NONE 0
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#define TINF_CHKSUM_ADLER 1
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#define TINF_CHKSUM_CRC 2
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/* helper macros */
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#define TINF_ARRAY_SIZE(arr) (sizeof(arr) / sizeof(*(arr)))
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/* data structures */
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typedef struct {
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unsigned short table[16]; /* table of code length counts */
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unsigned short trans[288]; /* code -> symbol translation table */
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} TINF_TREE;
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struct TINF_DATA;
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typedef struct TINF_DATA {
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/* Pointer to the next byte in the input buffer */
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const unsigned char *source;
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/* Pointer to the next byte past the input buffer (source_limit = source + len) */
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const unsigned char *source_limit;
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/* If source_limit == NULL, or source >= source_limit, this function
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will be used to read next byte from source stream. The function may
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also return -1 in
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case of EOF (or irrecoverable error). Note that besides returning
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the next byte, it may also update source and sourceRemaining fields,
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thus allowing for buffered operation. */
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int (*readSource)(struct TINF_DATA *data);
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unsigned int tag;
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unsigned int bitcount;
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/* Buffer start */
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unsigned char *destStart;
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/* Buffer total size */
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unsigned int destSize;
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/* Current pointer in buffer */
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unsigned char *dest;
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/* Remaining bytes in buffer */
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unsigned int destRemaining;
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/* Accumulating checksum */
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unsigned int checksum;
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char checksum_type;
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bool eof;
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int btype;
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int bfinal;
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unsigned int curlen;
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int lzOff;
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unsigned char *dict_ring;
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unsigned int dict_size;
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unsigned int dict_idx;
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TINF_TREE ltree; /* dynamic length/symbol tree */
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TINF_TREE dtree; /* dynamic distance tree */
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} TINF_DATA;
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#define TINF_PUT(d, c) \
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{ \
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*d->dest++ = c; \
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if (d->dict_ring) { d->dict_ring[d->dict_idx++] = c; if (d->dict_idx == d->dict_size) d->dict_idx = 0; } \
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}
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unsigned char TINFCC uzlib_get_byte(TINF_DATA *d);
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/* Decompression API */
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void TINFCC uzlib_init(void);
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void TINFCC uzlib_uncompress_init(TINF_DATA *d, void *dict, unsigned int dictLen);
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int TINFCC uzlib_uncompress(TINF_DATA *d);
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int TINFCC uzlib_uncompress_chksum(TINF_DATA *d);
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int TINFCC uzlib_zlib_parse_header(TINF_DATA *d);
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int TINFCC uzlib_gzip_parse_header(TINF_DATA *d);
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/* Compression API */
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void TINFCC uzlib_compress(void *data, const uint8_t *src, unsigned slen);
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/* Checksum API */
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/* prev_sum is previous value for incremental computation, 1 initially */
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uint32_t TINFCC uzlib_adler32(const void *data, unsigned int length, uint32_t prev_sum);
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/* crc is previous value for incremental computation, 0xffffffff initially */
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uint32_t TINFCC uzlib_crc32(const void *data, unsigned int length, uint32_t crc);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* TINF_H_INCLUDED */
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