/*

 * 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>

#include <isl/ctx.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)0
 :            \

  ((bits) >= 16) ?            \

        
((h) >> (bits)) ^ ((h) & (((uint32_t)1 << (bits)) - 1))0
 :  \

        (((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_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);

isl_stat isl_hash_table_foreach(isl_ctx *ctx, struct isl_hash_table *table,

  isl_stat (*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