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diff --git a/extern/draco/draco/src/draco/core/data_buffer.h b/extern/draco/draco/src/draco/core/data_buffer.h
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+// Copyright 2016 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.
+//
+#ifndef DRACO_CORE_DATA_BUFFER_H_
+#define DRACO_CORE_DATA_BUFFER_H_
+
+#include <cstring>
+#include <ostream>
+#include <vector>
+
+#include "draco/core/draco_types.h"
+
+namespace draco {
+
+// Buffer descriptor servers as a unique identifier of a buffer.
+struct DataBufferDescriptor {
+  DataBufferDescriptor() : buffer_id(0), buffer_update_count(0) {}
+  // Id of the data buffer.
+  int64_t buffer_id;
+  // The number of times the buffer content was updated.
+  int64_t buffer_update_count;
+};
+
+// Class used for storing raw buffer data.
+class DataBuffer {
+ public:
+  DataBuffer();
+  bool Update(const void *data, int64_t size);
+  bool Update(const void *data, int64_t size, int64_t offset);
+
+  // Reallocate the buffer storage to a new size keeping the data unchanged.
+  void Resize(int64_t new_size);
+  void WriteDataToStream(std::ostream &stream);
+  // Reads data from the buffer. Potentially unsafe, called needs to ensure
+  // the accessed memory is valid.
+  void Read(int64_t byte_pos, void *out_data, size_t data_size) const {
+    memcpy(out_data, data() + byte_pos, data_size);
+  }
+
+  // Writes data to the buffer. Unsafe, caller must ensure the accessed memory
+  // is valid.
+  void Write(int64_t byte_pos, const void *in_data, size_t data_size) {
+    memcpy(const_cast<uint8_t *>(data()) + byte_pos, in_data, data_size);
+  }
+
+  // Copies data from another buffer to this buffer.
+  void Copy(int64_t dst_offset, const DataBuffer *src_buf, int64_t src_offset,
+            int64_t size) {
+    memcpy(const_cast<uint8_t *>(data()) + dst_offset,
+           src_buf->data() + src_offset, size);
+  }
+
+  void set_update_count(int64_t buffer_update_count) {
+    descriptor_.buffer_update_count = buffer_update_count;
+  }
+  int64_t update_count() const { return descriptor_.buffer_update_count; }
+  size_t data_size() const { return data_.size(); }
+  const uint8_t *data() const { return data_.data(); }
+  uint8_t *data() { return &data_[0]; }
+  int64_t buffer_id() const { return descriptor_.buffer_id; }
+  void set_buffer_id(int64_t buffer_id) { descriptor_.buffer_id = buffer_id; }
+
+ private:
+  std::vector<uint8_t> data_;
+  // Counter incremented by Update() calls.
+  DataBufferDescriptor descriptor_;
+};
+
+}  // namespace draco
+
+#endif  // DRACO_CORE_DATA_BUFFER_H_