/*

 * Copyright 2008-2009 Katholieke Universiteit Leuven

 *

 * Use of this software is governed by the MIT license

 *

 * Written by Sven Verdoolaege, K.U.Leuven, Departement

 * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium

 */

#ifndef ISL_HASH_H

#define ISL_HASH_H

#include <stdlib.h>

#include <isl/stdint.h>

#if defined(__cplusplus)

extern "C" {

#endif

#define isl_hash_init()		(2166136261u)

#define isl_hash_byte(h,b)	do {					\

					h *= 16777619;			\

					h ^= b;				\

				} while(0)

#define isl_hash_hash(h,h2)						\

	do {								\

		isl_hash_byte(h, (h2) & 0xFF);				\

		isl_hash_byte(h, ((h2) >> 8) & 0xFF);			\

		isl_hash_byte(h, ((h2) >> 16) & 0xFF);			\

		isl_hash_byte(h, ((h2) >> 24) & 0xFF);			\

	} while(0)

#define isl_hash_bits(h,bits)						\

	((bits) == 32) ? (h) :						\

	((bits) >= 16) ?						\

	      ((h) >> (bits)) ^ ((h) & (((uint32_t)1 << (bits)) - 1)) :	\

	      (((h) >> (bits)) ^ (h)) & (((uint32_t)1 << (bits)) - 1)

uint32_t isl_hash_string(uint32_t hash, const char *s);

uint32_t isl_hash_mem(uint32_t hash, const void *p, size_t len);

#define isl_hash_builtin(h,l)	isl_hash_mem(h, &l, sizeof(l))

struct isl_hash_table_entry

{

	uint32_t  hash;

	void     *data;

};

struct isl_hash_table {

	int    bits;

	int    n;

	struct isl_hash_table_entry *entries;

};

struct isl_ctx;

struct isl_hash_table *isl_hash_table_alloc(struct isl_ctx *ctx, int min_size);

void isl_hash_table_free(struct isl_ctx *ctx, struct isl_hash_table *table);

int isl_hash_table_init(struct isl_ctx *ctx, struct isl_hash_table *table,

			int min_size);

void isl_hash_table_clear(struct isl_hash_table *table);

struct isl_hash_table_entry *isl_hash_table_find(struct isl_ctx *ctx,

				struct isl_hash_table *table,

				uint32_t key_hash,

				int (*eq)(const void *entry, const void *val),

				const void *val, int reserve);

int isl_hash_table_foreach(struct isl_ctx *ctx,

			    struct isl_hash_table *table,

			    int (*fn)(void **entry, void *user), void *user);

void isl_hash_table_remove(struct isl_ctx *ctx,

				struct isl_hash_table *table,

				struct isl_hash_table_entry *entry);

#if defined(__cplusplus)

}

#endif

#endif