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/* See endianconv.c top comments for more information
*
* ----------------------------------------------------------------------------
*
* Copyright (c) 2011-Present, Redis Ltd.
* All rights reserved.
*
* Licensed under your choice of (a) the Redis Source Available License 2.0
* (RSALv2); or (b) the Server Side Public License v1 (SSPLv1); or (c) the
* GNU Affero General Public License v3 (AGPLv3).
*/
#ifndef __ENDIANCONV_H
#define __ENDIANCONV_H
#include "config.h"
#include <stdint.h>
/* --------------------------------------------------------------------------
* Optimized endian conversion helpers
* -------------------------------------------------------------------------- */
/* For GCC, Clang — use builtins that compile to a single instruction */
#if defined(__GNUC__) || defined(__clang__)
#define REDIS_BSWAP64(v) __builtin_bswap64(v)
#else
#define REDIS_BSWAP64(v) intrev64(v)
#endif
void memrev16(void *p);
void memrev32(void *p);
void memrev64(void *p);
uint16_t intrev16(uint16_t v);
uint32_t intrev32(uint32_t v);
uint64_t intrev64(uint64_t v);
/* variants of the function doing the actual conversion only if the target
* host is big endian */
#if (BYTE_ORDER == LITTLE_ENDIAN)
#define memrev16ifbe(p) ((void)(0))
#define memrev32ifbe(p) ((void)(0))
#define memrev64ifbe(p) ((void)(0))
#define intrev16ifbe(v) (v)
#define intrev32ifbe(v) (v)
#define intrev64ifbe(v) (v)
#else
#define memrev16ifbe(p) memrev16(p)
#define memrev32ifbe(p) memrev32(p)
#define memrev64ifbe(p) memrev64(p)
#define intrev16ifbe(v) intrev16(v)
#define intrev32ifbe(v) intrev32(v)
#define intrev64ifbe(v) intrev64(v)
#endif
/* The functions htonu64() and ntohu64() convert the specified value to
* network byte ordering and back. In big endian systems they are no-ops. */
#if (BYTE_ORDER == BIG_ENDIAN)
#define htonu64(v) (v)
#define ntohu64(v) (v)
#else
#define htonu64(v) REDIS_BSWAP64(v)
#define ntohu64(v) REDIS_BSWAP64(v)
#endif
#ifdef REDIS_TEST
int endianconvTest(int argc, char *argv[], int flags);
#endif
#endif
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