/*
 *  Utilities
 */

#ifndef __DUK_UTIL_H
#define __DUK_UTIL_H 1

#include "duk_bittypes.h"

#define  DUK_UTIL_MIN_HASH_PRIME  17  /* must match genhashsizes.py */

#define  DUK_UTIL_GET_HASH_PROBE_STEP(hash)  (duk_util_probe_steps[(hash) & 0x1f])

/*
 *  Bitstream decoder
 */

struct duk_bitdecoder_ctx {
	duk_u8 *data;
	duk_u32 offset;
	duk_u32 length;
	duk_u32 currval;
	duk_u32 currbits;
};

/*
 *  Prototypes
 */

/* Note: assumes that duk_util_probe_steps size is 32 */
extern duk_u8 duk_util_probe_steps[32];

duk_u32 duk_util_hashbytes(duk_u8 *data, duk_u32 len, duk_u32 seed);

duk_u32 duk_util_get_hash_prime(duk_u32 size);

duk_u32 duk_bd_decode(duk_bitdecoder_ctx *ctx, int bits);
int duk_bd_decode_flag(duk_bitdecoder_ctx *ctx);

void duk_util_base64_encode(const unsigned char *src, unsigned char *dst, size_t len);

duk_u32 duk_util_tinyrandom_get_bits(duk_hthread *thr, int n);
double duk_util_tinyrandom_get_double(duk_hthread *thr);

#endif  /* __DUK_UTIL_H */