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68 lines
2.1 KiB
68 lines
2.1 KiB
/* |
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* Copyright (C) 2016 The Android Open Source Project |
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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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* http://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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*/ |
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#ifndef BYTE_BUFFER_H_ |
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#define BYTE_BUFFER_H_ |
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#include <array> |
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#include <cstring> |
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#include "android-base/logging.h" |
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#include "wifilogd/local_utils.h" |
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namespace android { |
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namespace wifilogd { |
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// A fixed-size buffer, which provides the ability to accumulate bytes. |
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// The buffer tracks its (populated) size, and does not require dynamic |
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// memory allocation. |
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// |
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// Usage could be as follows: |
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// const auto& buffer = ByteBuffer<1024>() |
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// .AppendOrDie(header.data(), header.size()) |
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// .AppendOrDie(body.data(), body.size()); |
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// write(fd, buffer.data(), buffer.size()); |
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template <size_t SizeBytes> |
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class ByteBuffer { |
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public: |
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ByteBuffer() : write_pos_(0) {} |
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// Appends data to the end of this buffer. Aborts if the available |
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// space in the buffer is less than |data_len|. Returns a reference to |
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// the ByteBuffer, to support chaining. |
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ByteBuffer<SizeBytes>& AppendOrDie(NONNULL const void* data, |
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size_t data_len) { |
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CHECK(data_len <= raw_buffer_.size() - write_pos_); |
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std::memcpy(raw_buffer_.data() + write_pos_, data, data_len); |
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write_pos_ += data_len; |
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return *this; |
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} |
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// Returns a pointer to the head of this buffer. |
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RETURNS_NONNULL const uint8_t* data() const { return raw_buffer_.data(); } |
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// Returns the number of bytes written to this buffer. |
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size_t size() const { return write_pos_; } |
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private: |
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std::array<uint8_t, SizeBytes> raw_buffer_; |
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size_t write_pos_; |
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}; |
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} // namespace wifilogd |
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} // namespace android |
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#endif // BYTE_BUFFER_H_
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