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/******************************************************************************
* 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. *
******************************************************************************/
#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. */
#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 {
unsigned long HTable[HT_SIZE];
} GifHashTableType;
GifHashTableType *_InitHashTable(void);
void _ClearHashTable(GifHashTableType *HashTable);
void _InsertHashTable(GifHashTableType *HashTable, unsigned long Key, int Code);
int _ExistsHashTable(GifHashTableType *HashTable, unsigned long Key);
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