1 files changed, 84 insertions, 0 deletions
diff --git a/ext/hash/murmur/endianness.h b/ext/hash/murmur/endianness.h
new file mode 100644
index 0000000000..3dbb2e6a3d
--- /dev/null
+++ b/ext/hash/murmur/endianness.h
@@ -0,0 +1,84 @@
+static const union {
+  uint8_t u8[2];
+  uint16_t u16;
+} EndianMix = {{ 1, 0 }};
+FORCE_INLINE int IsBigEndian()
+{
+  // Constant-folded by the compiler.
+  return EndianMix.u16 != 1;
+}
+
+#if defined(_MSC_VER)
+#  include <stdlib.h>
+#  define BSWAP32(u) _byteswap_ulong(u)
+#  define BSWAP64(u) _byteswap_uint64(u)
+#else
+#  ifdef __has_builtin
+#    if __has_builtin(__builtin_bswap32)
+#      define BSWAP32(u) __builtin_bswap32(u)
+#    endif // __has_builtin(__builtin_bswap32)
+#    if __has_builtin(__builtin_bswap64)
+#      define BSWAP64(u) __builtin_bswap64(u)
+#    endif // __has_builtin(__builtin_bswap64)
+#  elif defined(__GNUC__) && ( \
+                    __GNUC__ > 4 || ( \
+                      __GNUC__ == 4 && ( \
+                        __GNUC_MINOR__ >= 3 \
+                      ) \
+                    ) \
+                  )
+#    define BSWAP32(u) __builtin_bswap32(u)
+#    define BSWAP64(u) __builtin_bswap64(u)
+#  endif // __has_builtin
+#endif // defined(_MSC_VER)
+
+#ifndef BSWAP32
+FORCE_INLINE uint32_t BSWAP32(uint32_t u)
+{
+  return (((u & 0xff000000) >> 24)
+          | ((u & 0x00ff0000) >>  8)
+          | ((u & 0x0000ff00) <<  8)
+          | ((u & 0x000000ff) << 24));
+}
+#endif
+#ifndef BSWAP64
+FORCE_INLINE uint64_t BSWAP64(uint64_t u)
+{
+   return (((u & 0xff00000000000000ULL) >> 56)
+          | ((u & 0x00ff000000000000ULL) >> 40)
+          | ((u & 0x0000ff0000000000ULL) >> 24)
+          | ((u & 0x000000ff00000000ULL) >>  8)
+          | ((u & 0x00000000ff000000ULL) <<  8)
+          | ((u & 0x0000000000ff0000ULL) << 24)
+          | ((u & 0x000000000000ff00ULL) << 40)
+          | ((u & 0x00000000000000ffULL) << 56));
+}
+#endif
+
+#if defined(__clang__) || defined(__GNUC__) &&  __GNUC__ >= 8
+# define NO_SANITIZE_ALIGNMENT __attribute__((no_sanitize("alignment")))
+#else
+# define NO_SANITIZE_ALIGNMENT
+#endif
+
+NO_SANITIZE_ALIGNMENT
+FORCE_INLINE uint32_t getblock32 ( const uint32_t * const p, const int i)
+{
+  if (IsBigEndian()) {
+    return BSWAP32(p[i]);
+  } else {
+    return p[i];
+  }
+}
+
+NO_SANITIZE_ALIGNMENT
+FORCE_INLINE uint64_t getblock64 ( const uint64_t * const p, const int i)
+{
+  if (IsBigEndian()) {
+    return BSWAP64(p[i]);
+  } else {
+    return p[i];
+  }
+}
+
+#undef NO_SANITIZE_ALIGNMENT