normalize and port the rest of Firebase/Port code (#713)

* normalize bits
* normalize ordered_code

1 files changed, 43 insertions, 0 deletions

diff --git a/Firestore/core/src/firebase/firestore/util/bits.cc b/Firestore/core/src/firebase/firestore/util/bits.cc
new file mode 100644
index 0000000..0bfe4c3
--- /dev/null
+++ b/Firestore/core/src/firebase/firestore/util/bits.cc
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Firestore/core/src/firebase/firestore/util/bits.h"
+
+#include "Firestore/core/src/firebase/firestore/util/firebase_assert.h"
+
+namespace firebase {
+namespace firestore {
+namespace util {
+
+int Bits::Log2Floor_Portable(uint32_t n) {
+  if (n == 0) return -1;
+  int log = 0;
+  uint32_t value = n;
+  for (int i = 4; i >= 0; --i) {
+    int shift = (1 << i);
+    uint32_t x = value >> shift;
+    if (x != 0) {
+      value = x;
+      log += shift;
+    }
+  }
+  FIREBASE_ASSERT(value == 1);
+  return log;
+}
+
+}  // namespace util
+}  // namespace firestore
+}  // namespace firebase