107 lines
2.1 KiB
C++
107 lines
2.1 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2021
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/utils/common.h"
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#if TD_HAVE_ZLIB
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#include "td/utils/buffer.h"
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#include "td/utils/Slice.h"
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#include "td/utils/Status.h"
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namespace td {
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class Gzip {
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public:
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Gzip();
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Gzip(const Gzip &) = delete;
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Gzip &operator=(const Gzip &) = delete;
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Gzip(Gzip &&other) noexcept;
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Gzip &operator=(Gzip &&other) noexcept;
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~Gzip();
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enum class Mode { Empty, Encode, Decode };
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Status init(Mode mode) TD_WARN_UNUSED_RESULT {
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if (mode == Mode::Encode) {
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return init_encode();
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} else if (mode == Mode::Decode) {
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return init_decode();
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}
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clear();
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return Status::OK();
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}
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Status init_encode() TD_WARN_UNUSED_RESULT;
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Status init_decode() TD_WARN_UNUSED_RESULT;
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void set_input(Slice input);
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void set_output(MutableSlice output);
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void close_input() {
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close_input_flag_ = true;
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}
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bool need_input() const {
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return left_input() == 0;
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}
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bool need_output() const {
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return left_output() == 0;
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}
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size_t left_input() const;
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size_t left_output() const;
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size_t used_input() const {
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return input_size_ - left_input();
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}
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size_t used_output() const {
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return output_size_ - left_output();
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}
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size_t flush_input() {
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auto res = used_input();
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input_size_ = left_input();
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return res;
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}
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size_t flush_output() {
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auto res = used_output();
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output_size_ = left_output();
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return res;
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}
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enum class State { Running, Done };
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Result<State> run() TD_WARN_UNUSED_RESULT;
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private:
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class Impl;
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unique_ptr<Impl> impl_;
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size_t input_size_ = 0;
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size_t output_size_ = 0;
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bool close_input_flag_ = false;
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Mode mode_ = Mode::Empty;
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void init_common();
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void clear();
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void swap(Gzip &other);
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};
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BufferSlice gzdecode(Slice s);
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BufferSlice gzencode(Slice s, double max_compression_ratio);
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} // namespace td
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#endif
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