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https://github.com/kidfromjupiter/nearby.git
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64 lines
2.0 KiB
C++
64 lines
2.0 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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#ifndef PLATFORM_BASE_STREAM_READERH_
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#define PLATFORM_BASE_STREAM_READERH_
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#include <cstddef>
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#include <cstdint>
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#include <optional>
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#include "internal/platform/byte_array.h"
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#include "internal/platform/exception.h"
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namespace nearby {
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// A base {@link InputStream } for reading the contents of a byte array.
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class StreamReader {
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public:
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explicit StreamReader(ByteArray &buffer) : buffer_{buffer} {}
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StreamReader(const StreamReader &) = delete;
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StreamReader &operator=(const StreamReader &) = delete;
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~StreamReader() = default;
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// Reads less than 8 bits from the stream, returning the value if available.
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// The read bits cannot across a byte boundary.
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std::optional<std::uint8_t> ReadBits(int bits);
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std::optional<std::uint8_t> ReadUint8();
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std::optional<std::int8_t> ReadInt8();
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std::optional<std::uint16_t> ReadUint16();
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std::optional<std::int16_t> ReadInt16();
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std::optional<std::uint32_t> ReadUint32();
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std::optional<std::int32_t> ReadInt32();
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std::optional<std::uint64_t> ReadUint64();
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std::optional<std::int64_t> ReadInt64();
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std::optional<ByteArray> ReadBytes(int size);
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bool IsAvailable(int size) const {
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return buffer_.size() - position_ >= size;
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}
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private:
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ExceptionOr<ByteArray> Read(std::int64_t size);
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uint8_t bits_unused_{0};
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uint8_t bits_buffer_{0};
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ByteArray &buffer_;
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size_t position_{0};
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};
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} // namespace nearby
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#endif // PLATFORM_BASE_STREAM_READERH_
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