1 files changed, 36 insertions, 0 deletions
diff --git a/extern/draco/draco/src/draco/core/bit_utils.cc b/extern/draco/draco/src/draco/core/bit_utils.cc
new file mode 100644
index 00000000000..37119a7171b
--- /dev/null
+++ b/extern/draco/draco/src/draco/core/bit_utils.cc
@@ -0,0 +1,36 @@
+// Copyright 2017 The Draco Authors.
+//
+// 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 "draco/core/bit_utils.h"
+
+namespace draco {
+
+void ConvertSignedIntsToSymbols(const int32_t *in, int in_values,
+                                uint32_t *out) {
+  // Convert the quantized values into a format more suitable for entropy
+  // encoding.
+  // Put the sign bit into LSB pos and shift the rest one bit left.
+  for (int i = 0; i < in_values; ++i) {
+    out[i] = ConvertSignedIntToSymbol(in[i]);
+  }
+}
+
+void ConvertSymbolsToSignedInts(const uint32_t *in, int in_values,
+                                int32_t *out) {
+  for (int i = 0; i < in_values; ++i) {
+    out[i] = ConvertSymbolToSignedInt(in[i]);
+  }
+}
+
+}  // namespace draco