fcb8d040e8
Instead of lengthy blurbs, switch to single-line, machine-readable standardized (https://spdx.dev) license identifiers. The Linux kernel switched long ago, so there is strong precedent. Three cases are handled: AGPL-only, Apache-only, and dual licensed. For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0), reasoning that our changes are extensive enough to apply our license. The changes we applied mechanically with a script, except to licenses/README.md. Closes #9937
54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
/*
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* Copyright (C) 2017-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#include "prepended_input_stream.hh"
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using namespace seastar;
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class prepended_data_source_impl : public data_source_impl {
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private:
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temporary_buffer<char> _buf;
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data_source _ds;
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public:
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prepended_data_source_impl(temporary_buffer<char>&& buf, data_source&& ds)
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: _buf(std::move(buf)), _ds(std::move(ds))
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{}
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prepended_data_source_impl(prepended_data_source_impl&&) = default;
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prepended_data_source_impl& operator=(prepended_data_source_impl&&) = default;
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virtual future<temporary_buffer<char>> get() override {
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if (_buf) {
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return make_ready_future<temporary_buffer<char>>(std::move(_buf));
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}
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return _ds.get();
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}
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virtual future<temporary_buffer<char>> skip(uint64_t n) override {
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if (n < _buf.size()) {
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_buf.trim_front(n);
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return make_ready_future<temporary_buffer<char>>(std::move(_buf));
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} else {
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n -= _buf.size();
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_buf = {};
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if (n > 0) {
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return _ds.skip(n);
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} else {
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return _ds.get();
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}
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}
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}
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virtual future<> close() override {
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return _ds.close();
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}
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};
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input_stream<char> make_prepended_input_stream(temporary_buffer<char>&& buf, data_source&& ds) {
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auto impl = std::make_unique<prepended_data_source_impl>(std::move(buf), std::move(ds));
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return input_stream<char>{data_source{std::move(impl)}};
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}
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