mirror of
https://github.com/kidfromjupiter/nearby.git
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83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "internal/platform/base64_utils.h"
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#include <cstdint>
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#include <string>
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#include <utility>
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#include "absl/strings/escaping.h"
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#include "absl/strings/string_view.h"
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#include "internal/platform/byte_array.h"
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#include "internal/platform/exception.h"
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#include "internal/platform/input_stream.h"
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#include "internal/platform/output_stream.h"
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namespace nearby {
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std::string Base64Utils::Encode(const ByteArray& bytes) {
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std::string base64_string;
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absl::WebSafeBase64Escape(std::string(bytes), &base64_string);
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return base64_string;
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}
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ByteArray Base64Utils::Decode(absl::string_view base64_string) {
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std::string decoded_string;
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if (!absl::WebSafeBase64Unescape(base64_string, &decoded_string)) {
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return ByteArray();
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}
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return ByteArray(decoded_string.data(), decoded_string.size());
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}
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std::int32_t Base64Utils::BytesToInt(const ByteArray& bytes) {
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const char* int_bytes = bytes.data();
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std::int32_t result = 0;
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result |= (static_cast<std::int32_t>(int_bytes[0]) & 0x0FF) << 24;
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result |= (static_cast<std::int32_t>(int_bytes[1]) & 0x0FF) << 16;
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result |= (static_cast<std::int32_t>(int_bytes[2]) & 0x0FF) << 8;
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result |= (static_cast<std::int32_t>(int_bytes[3]) & 0x0FF);
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return result;
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}
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ByteArray Base64Utils::IntToBytes(std::int32_t value) {
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char int_bytes[sizeof(std::int32_t)];
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int_bytes[0] = static_cast<char>((value >> 24) & 0x0FF);
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int_bytes[1] = static_cast<char>((value >> 16) & 0x0FF);
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int_bytes[2] = static_cast<char>((value >> 8) & 0x0FF);
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int_bytes[3] = static_cast<char>((value) & 0x0FF);
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return ByteArray(int_bytes, sizeof(int_bytes));
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}
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ExceptionOr<std::int32_t> Base64Utils::ReadInt(InputStream* reader) {
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ExceptionOr<ByteArray> read_bytes = reader->ReadExactly(sizeof(std::int32_t));
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if (!read_bytes.ok()) {
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return ExceptionOr<std::int32_t>(read_bytes.exception());
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}
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return ExceptionOr<std::int32_t>(
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BytesToInt(std::move(read_bytes.result())));
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}
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Exception Base64Utils::WriteInt(OutputStream* writer, std::int32_t value) {
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return writer->Write(IntToBytes(value));
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}
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} // namespace nearby
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