70 lines
1.7 KiB
C++
70 lines
1.7 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
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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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#include "td/utils/GzipByteFlow.h"
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char disable_linker_warning_about_empty_file_gzipbyteflow_cpp TD_UNUSED;
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#if TD_HAVE_ZLIB
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#include "td/utils/Status.h"
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namespace td {
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void GzipByteFlow::loop() {
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while (true) {
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if (gzip_.need_input()) {
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auto slice = input_->prepare_read();
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if (slice.empty()) {
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if (!is_input_active_) {
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gzip_.close_input();
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} else {
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break;
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}
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} else {
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gzip_.set_input(input_->prepare_read());
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}
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}
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if (gzip_.need_output()) {
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auto slice = output_.prepare_append();
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CHECK(!slice.empty());
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gzip_.set_output(slice);
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}
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auto r_state = gzip_.run();
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auto output_size = gzip_.flush_output();
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if (output_size) {
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uncommited_size_ += output_size;
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total_output_size_ += output_size;
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if (total_output_size_ > max_output_size_) {
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return finish(Status::Error("Max output size limit exceeded"));
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}
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output_.confirm_append(output_size);
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}
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auto input_size = gzip_.flush_input();
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if (input_size) {
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input_->confirm_read(input_size);
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}
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if (r_state.is_error()) {
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return finish(r_state.move_as_error());
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}
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auto state = r_state.ok();
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if (state == Gzip::Done) {
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on_output_updated();
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return consume_input();
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}
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}
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if (uncommited_size_ >= MIN_UPDATE_SIZE) {
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uncommited_size_ = 0;
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on_output_updated();
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}
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}
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constexpr size_t GzipByteFlow::MIN_UPDATE_SIZE;
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} // namespace td
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#endif
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