/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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 */

/******************************************************************************

gif_hash.h - magfic constants and declarations for GIF LZW

******************************************************************************/

#ifndef _GIF_HASH_H_
#define _GIF_HASH_H_

#include <stdint.h>

#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)

typedef struct GifHashTableType {
    uint32_t HTable[HT_SIZE];
} GifHashTableType;

GifHashTableType *_InitHashTable(void);
void _ClearHashTable(GifHashTableType *HashTable);
void _InsertHashTable(GifHashTableType *HashTable, uint32_t Key, int Code);
int _ExistsHashTable(GifHashTableType *HashTable, uint32_t Key);

#endif /* _GIF_HASH_H_ */

/* end */