text: /******************************************************************************
  * 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_ */
  