1 files changed, 69 insertions, 0 deletions

diff --git a/examples/redis-unstable/src/endianconv.h b/examples/redis-unstable/src/endianconv.h
new file mode 100644
index 0000000..ca63cd9
--- /dev/null
+++ b/examples/redis-unstable/src/endianconv.h
@@ -0,0 +1,69 @@
+/* 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