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89 lines
2.7 KiB
89 lines
2.7 KiB
// Copyright 2020 The Pigweed Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// 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, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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#include "pw_kvs/alignment.h"
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#include "pw_status/try.h"
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namespace pw {
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StatusWithSize AlignedWriter::Write(std::span<const std::byte> data) {
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while (!data.empty()) {
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size_t to_copy = std::min(write_size_ - bytes_in_buffer_, data.size());
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std::memcpy(&buffer_[bytes_in_buffer_], data.data(), to_copy);
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PW_TRY_WITH_SIZE(AddBytesToBuffer(to_copy));
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data = data.subspan(to_copy);
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}
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return StatusWithSize(bytes_written_);
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}
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StatusWithSize AlignedWriter::Flush() {
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Status status;
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// If data remains in the buffer, pad it to the alignment size and flush the
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// remaining data.
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if (bytes_in_buffer_ != 0u) {
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const size_t remaining_bytes = AlignUp(bytes_in_buffer_, alignment_bytes_);
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std::memset(&buffer_[bytes_in_buffer_],
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int(kPadByte),
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remaining_bytes - bytes_in_buffer_);
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status = output_.Write(buffer_, remaining_bytes).status();
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bytes_written_ += remaining_bytes; // Include padding in the total.
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bytes_in_buffer_ = 0;
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}
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const StatusWithSize result(status, bytes_written_);
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bytes_written_ = 0;
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return result;
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}
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StatusWithSize AlignedWriter::Write(Input& input, size_t size) {
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while (size > 0u) {
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const size_t to_read = std::min(write_size_ - bytes_in_buffer_, size);
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StatusWithSize result = input.Read(buffer_ + bytes_in_buffer_, to_read);
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if (!result.ok()) {
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return StatusWithSize(result.status(), bytes_written_);
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}
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PW_TRY_WITH_SIZE(AddBytesToBuffer(to_read));
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size -= result.size();
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}
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return StatusWithSize(bytes_written_);
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}
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StatusWithSize AlignedWriter::AddBytesToBuffer(size_t bytes_added) {
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bytes_in_buffer_ += bytes_added;
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// If the buffer is full, write it out.
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if (bytes_in_buffer_ == write_size_) {
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StatusWithSize result = output_.Write(buffer_, write_size_);
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// Always use write_size_ for the bytes written. If there was an error
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// assume the space was written or at least disturbed.
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bytes_written_ += write_size_;
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bytes_in_buffer_ = 0;
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if (!result.ok()) {
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return StatusWithSize(result.status(), bytes_written_);
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}
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}
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return StatusWithSize(bytes_written_);
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}
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} // namespace pw
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