/* lzwh.h : LZW compression with Horspool's phased-in coding and accelerated loading */
/* Made by a machine. PUBLIC DOMAIN (CC0-1.0) */

#ifndef LZWH_H
#define LZWH_H

#include <stddef.h>
#include <stdint.h>

#define LZWH_DICT_BITS_DEFAULT 16
#define LZWH_DICT_BITS_MIN 9
#define LZWH_DICT_BITS_MAX 16
#define LZWH_ACCEL_DEFAULT 1

#define LZWH_OK 0
#define LZWH_ERR (-1)
#define LZWH_ERR_NOMEM (-2)
#define LZWH_ERR_CORRUPT (-3)

struct lzwh_params {
    unsigned dict_bits;
    unsigned accel_max;
};

/** Compress src into a malloc'd buffer returned via out/out_len.
 *
 * dict_bits controls max dictionary size (9..16, default 16).
 * accel_max controls accelerated loading depth (1 = standard LZW,
 * higher = more aggressive preloading, 3-5 recommended for text).
 * Returns LZWH_OK on success, negative on error.
 */
int
lzwh_compress(const uint8_t *src, size_t src_len,
              uint8_t **out, size_t *out_len,
              const struct lzwh_params *params);

/** Decompress src into a malloc'd buffer returned via out/out_len.
 *
 * params must match those used during compression.
 * Returns LZWH_OK on success, negative on error.
 */
int
lzwh_decompress(const uint8_t *src, size_t src_len,
                uint8_t **out, size_t *out_len,
                const struct lzwh_params *params);

/** Fill params with defaults. */
void
lzwh_params_init(struct lzwh_params *p);

#endif /* LZWH_H */