Release based on cl/313536507.

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: I83ec7dee1a7ef6f4bdfd47482c94d03910525b7e

cpp/platform_v2/base/byte_array.h

@@ -0,0 +1,95 @@
+// 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_V2_BASE_BYTE_ARRAY_H_
+#define PLATFORM_V2_BASE_BYTE_ARRAY_H_
+
+#include <cstdint>
+#include <string>
+
+#include "absl/strings/string_view.h"
+
+namespace location {
+namespace nearby {
+
+class ByteArray {
+ public:
+  // Create an empty ByteArray
+  ByteArray() = default;
+  ByteArray(const ByteArray&) = default;
+  ByteArray& operator=(const ByteArray&) = default;
+  ByteArray(ByteArray&&) = default;
+  ByteArray& operator=(ByteArray&&) = default;
+
+  // Create ByteArray from string.
+  explicit ByteArray(absl::string_view 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) {
+    if (data == nullptr) {
+      size = 0;
+    }
+    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); }
+
+  // Returns true, if changes were performed to container, false otherwise.
+  bool CopyAt(size_t offset, const ByteArray& from, size_t source_offset = 0) {
+    if (offset >= size()) return false;
+    if (source_offset >= from.size()) return false;
+    memcpy(data() + offset, from.data() + source_offset,
+           std::min(size() - offset, from.size() - source_offset));
+    return true;
+  }
+
+  char* data() { return &data_[0]; }
+  const char* data() const { return data_.data(); }
+  size_t size() const { return data_.size(); }
+  bool Empty() const { return data_.empty(); }
+
+  friend bool operator==(const ByteArray& lhs, const ByteArray& rhs);
+  friend bool operator!=(const ByteArray& lhs, const ByteArray& rhs);
+  friend bool operator<(const ByteArray& lhs, const ByteArray& rhs);
+
+  explicit operator std::string() const { return data_; }
+
+ private:
+  std::string data_;
+};
+
+inline bool operator==(const ByteArray& lhs, const ByteArray& rhs) {
+  return lhs.data_ == rhs.data_;
+}
+
+inline bool operator!=(const ByteArray& lhs, const ByteArray& rhs) {
+  return !(lhs == rhs);
+}
+
+inline bool operator<(const ByteArray& lhs, const ByteArray& rhs) {
+  return lhs.data_ < rhs.data_;
+}
+
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_V2_BASE_BYTE_ARRAY_H_