48 lines
942 B
C
48 lines
942 B
C
/*
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exhal / inhal (de)compression routines
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by Devin Acker
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This code is released under the terms of the MIT license.
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See copying.txt for details.
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*/
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#ifndef _COMPRESS_H
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#define _COMPRESS_H
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#define DATA_SIZE 65536
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#define RUN_SIZE 32
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#define LONG_RUN_SIZE 1024
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// compression method values for backref_t and rle_t
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typedef enum {
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rle_8 = 0,
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rle_16 = 1,
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rle_seq = 2,
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lz_norm = 0,
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lz_rot = 1,
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lz_rev = 2
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} method_e;
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// used to store and compare backref candidates
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typedef struct {
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uint16_t offset, size;
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method_e method;
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} backref_t;
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// used to store RLE candidates
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typedef struct {
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uint16_t size, data;
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method_e method;
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} rle_t;
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size_t pack (uint8_t *unpacked, uint32_t inputsize, uint8_t *packed, int fast);
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size_t unpack (uint8_t *packed, uint8_t *unpacked);
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size_t unpack_from_file (FILE *file, unsigned int offset, uint8_t *unpacked);
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#endif
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