1 files changed, 38 insertions, 0 deletions
diff --git a/mfbt/HashFunctions.cpp b/mfbt/HashFunctions.cpp
new file mode 100644
index 0000000..28d4c9f
--- /dev/null
+++ b/mfbt/HashFunctions.cpp
@@ -0,0 +1,38 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Implementations of hash functions. */
+
+#include "mozilla/HashFunctions.h"
+#include "mozilla/Types.h"
+
+#include <string.h>
+
+namespace mozilla {
+
+MFBT_API(uint32_t)
+HashBytes(const void* bytes, size_t length)
+{
+  uint32_t hash = 0;
+  const char* b = reinterpret_cast<const char*>(bytes);
+
+  /* Walk word by word. */
+  size_t i = 0;
+  for (; i < length - (length % sizeof(size_t)); i += sizeof(size_t)) {
+    /* Do an explicitly unaligned load of the data. */
+    size_t data;
+    memcpy(&data, b + i, sizeof(size_t));
+
+    hash = AddToHash(hash, data, sizeof(data));
+  }
+
+  /* Get the remaining bytes. */
+  for (; i < length; i++)
+    hash = AddToHash(hash, b[i]);
+
+  return hash;
+}
+
+} /* namespace mozilla */