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// 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_BASE_BYTE_ARRAY_H_
#define PLATFORM_BASE_BYTE_ARRAY_H_
#include <algorithm>
#include <array>
#include <cstdint>
#include <cstring>
#include <string>
#include <type_traits>
#include <utility>
namespace location {
namespace nearby {
class ByteArray {
public:
// Create an empty ByteArray
ByteArray() = default;
template <size_t N>
explicit ByteArray(const std::array<char, N>& data) {
SetData(data.data(), data.size());
}
ByteArray(const ByteArray&) = default;
ByteArray& operator=(const ByteArray&) = default;
ByteArray(ByteArray&&) = default;
ByteArray& operator=(ByteArray&&) = default;
// Moves string out of temporary, allowing for a zero-copy constructions.
// This is an optimization for very large strings.
explicit ByteArray(std::string&& source) : data_(std::move(source)) {}
// Create ByteArray by copy of a std::string. This can't be a string_view,
// because it will conflict with std::string&& version of constructor.
explicit ByteArray(const std::string& source) {
SetData(source.data(), source.size());
}
// 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);
// Returns a copy of internal representation as std::string.
explicit operator std::string() const& { return data_; }
// Moves string out of temporary ByteArray, allowing for a zero-copy
// operation.
explicit operator std::string() && { return std::move(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_BASE_BYTE_ARRAY_H_
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