/******************************************************************************
* Declarations, global to other of the GIF-HASH.C module.                     *
*                                                                             *
*                                       Written by Gershon Elber,  Jun 1989   *
*******************************************************************************
* History:                                                                    *
* 14 Jun 89 - Version 1.0 by Gershon Elber.                                   *
******************************************************************************/

#ifndef GIF_HASH_H_
#define GIF_HASH_H_

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

/* Find a thirty-two bit int type */
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef HAVE_BASETSD_H
#include <basetsd.h>
#endif

#define HT_SIZE                 8192       /* 12bits = 4096 or twice as big! */
#define HT_KEY_MASK             0x1FFF                        /* 13bits keys */
#define HT_KEY_NUM_BITS         13                            /* 13bits keys */
#define HT_MAX_KEY              8191    /* 13bits - 1, maximal code possible */
#define HT_MAX_CODE             4095    /* Biggest code possible in 12 bits. */

/* The 32 bits of the long are divided into two parts for the key & code:   */
/* 1. The code is 12 bits as our compression algorithm is limited to 12bits */
/* 2. The key is 12 bits Prefix code + 8 bit new char or 20 bits.           */
/* The key is the upper 20 bits.  The code is the lower 12. */
#define HT_GET_KEY(l)   (l >> 12)
#define HT_GET_CODE(l)  (l & 0x0FFF)
#define HT_PUT_KEY(l)   (l << 12)
#define HT_PUT_CODE(l)  (l & 0x0FFF)

/* GDAL added */
typedef unsigned int UINT32;

typedef struct GifHashTableType {
    UINT32 HTable[HT_SIZE];
} GifHashTableType;

GifHashTableType *_InitHashTable(void);
void _ClearHashTable(GifHashTableType *HashTable);
void _InsertHashTable(GifHashTableType *HashTable, UINT32 Key, int Code);
int _ExistsHashTable(GifHashTableType *HashTable, UINT32 Key);

#endif /* GIF_HASH_H_ */
