f3eade2f62
Drop the AGPL license in favor of a source-available license. See the blog post [1] for details. [1] https://www.scylladb.com/2024/12/18/why-were-moving-to-a-source-available-license/
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: LicenseRef-ScyllaDB-Source-Available-1.0
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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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