JDK14/Java14源码在线阅读

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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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/******************************************************************************

gif_hash.h - magfic constants and declarations for GIF LZW

SPDX-License-Identifier: MIT

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

#ifndef _GIF_HASH_H_
#define _GIF_HASH_H_

/** Begin JDK modifications to support building on Windows **/
#ifndef _WIN32
#include <unistd.h>
#endif
/** End JDK modifications to support building on Windows **/
#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];

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