Initial public release of nearby library

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: I85d490e448375aa4eb7b09680757c02fff1420b4

cpp/platform/byte_array.h

@@ -0,0 +1,76 @@
+// Copyright 2020 Google LLC
+//
+// 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
+//
+//     https://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 PLATFORM_BYTE_ARRAY_H_
+#define PLATFORM_BYTE_ARRAY_H_
+
+#include "platform/port/string.h"
+
+namespace location {
+namespace nearby {
+
+class ByteArray {
+ public:
+  // Create an empty ByteArray
+  ByteArray() {}
+
+  // Create ByteArray from string.
+  explicit ByteArray(const std::string& source) {
+    data_ = source;
+  }
+
+  // Create default-initialized ByteArray of a given size.
+  explicit ByteArray(size_t size) {
+    setData(size);
+  }
+
+  // Create value-initialized ByteArray of a given size.
+  ByteArray(const char* data, size_t size) {
+    setData(data, size);
+  }
+
+  // Assign a new value to this ByteArray, as a copy of data, with a given size.
+  void setData(const char* data, size_t size) {
+    data_.assign(data, size);
+  }
+
+  // Assign a new value of a given size to this ByteArray
+  // (as a repeated char value).
+  void setData(size_t size, char value = 0) {
+    data_.assign(size, value);
+  }
+
+  char* getData() { return data_.data(); }
+  const char* getData() const { return data_.data(); }
+  size_t size() const { return data_.size(); }
+
+  // Operator overloads when comparing ConstPtr<ByteArray>.
+  bool operator==(const ByteArray& rhs) const {
+    return this->data_ == rhs.data_;
+  }
+  bool operator!=(const ByteArray& rhs) const { return !(*this == rhs); }
+  bool operator<(const ByteArray& rhs) const {
+    return this->data_ < rhs.data_;
+  }
+  // TODO(b/149869249) : rename according to go/c-style
+  std::string asString() const { return data_; }
+
+ private:
+  std::string data_;
+};
+
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_BYTE_ARRAY_H_