xref: /aosp_15_r20/external/giflib/gif_hash.h (revision 324bb76b8d05e2a05aa88511fff61cf3f9ca5892)

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

gif_hash.h - magfic constants and declarations for GIF LZW

SPDX-License-Identifier: MIT

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

#ifndef _GIF_HASH_H_
#define _GIF_HASH_H_

#ifndef _WIN32
#include <unistd.h>
#endif /* _WIN32 */
#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 */