mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-15 07:06:11 -04:00
100 lines
3.1 KiB
C++
100 lines
3.1 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/base_input_stream.h"
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namespace location {
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namespace nearby {
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ExceptionOr<ByteArray> BaseInputStream::Read(std::int64_t size) {
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if (!IsAvailable(size)) {
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return ExceptionOr<ByteArray>{Exception::kIo};
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}
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ByteArray read_bytes{static_cast<size_t>(size)};
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if (read_bytes.CopyAt(/*offset=*/0, buffer_,
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/*source_offset=*/position_)) {
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position_ += size;
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return ExceptionOr<ByteArray>{read_bytes};
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} else {
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return ExceptionOr<ByteArray>{Exception::kIo};
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}
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}
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std::uint8_t BaseInputStream::ReadUint8() {
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constexpr int byte_size = sizeof(std::uint8_t);
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ByteArray read_bytes = ReadBytes(byte_size);
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if (read_bytes.Empty() || read_bytes.size() != byte_size) {
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return -1;
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}
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return read_bytes.data()[0];
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}
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std::uint16_t BaseInputStream::ReadUint16() {
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constexpr int byte_size = sizeof(std::uint16_t);
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ByteArray read_bytes = ReadBytes(byte_size);
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if (read_bytes.Empty() || read_bytes.size() != byte_size) {
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return -1;
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}
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// Convert from network order.
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const char *data = read_bytes.data();
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return static_cast<uint16_t>(data[0]) << 8 | static_cast<uint16_t>(data[1]);
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}
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std::uint32_t BaseInputStream::ReadUint32() {
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constexpr int byte_size = sizeof(std::uint32_t);
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ByteArray read_bytes = ReadBytes(byte_size);
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if (read_bytes.Empty() || read_bytes.size() != byte_size) {
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return -1;
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}
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// Convert from network order.
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const char *data = read_bytes.data();
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return static_cast<uint32_t>(data[0]) << 24 |
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static_cast<uint32_t>(data[1]) << 16 |
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static_cast<uint32_t>(data[2]) << 8 | static_cast<uint32_t>(data[3]);
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}
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std::uint64_t BaseInputStream::ReadUint64() {
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constexpr int byte_size = sizeof(std::uint64_t);
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ByteArray read_bytes = ReadBytes(byte_size);
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if (read_bytes.Empty() || read_bytes.size() != byte_size) {
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return -1;
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}
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// Convert from network order.
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const char *data = read_bytes.data();
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return static_cast<uint64_t>(data[0]) << 56 |
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static_cast<uint64_t>(data[1]) << 48 |
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static_cast<uint64_t>(data[2]) << 40 |
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static_cast<uint64_t>(data[3]) << 32 |
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static_cast<uint64_t>(data[4]) << 24 |
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static_cast<uint64_t>(data[5]) << 16 |
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static_cast<uint64_t>(data[6]) << 8 | static_cast<uint64_t>(data[7]);
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}
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ByteArray BaseInputStream::ReadBytes(int size) {
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ExceptionOr<ByteArray> read_bytes_result = Read(size);
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if (!read_bytes_result.ok()) {
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return ByteArray{};
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}
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return read_bytes_result.GetResult();
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}
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} // namespace nearby
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} // namespace location
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