tdlight/tdutils/td/utils/GzipByteFlow.cpp
Arseny Smirnov 9ea1bc824f ByteFlow: backpressure draft
GitOrigin-RevId: 09adce82dd88fcf84f41e525e45b07da03acc0f6
2020-07-22 21:52:00 +03:00

68 lines
1.6 KiB
C++

//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/utils/GzipByteFlow.h"
char disable_linker_warning_about_empty_file_gzipbyteflow_cpp TD_UNUSED;
#if TD_HAVE_ZLIB
#include "td/utils/common.h"
#include "td/utils/Status.h"
namespace td {
bool GzipByteFlow::loop() {
bool result = false;
if (gzip_.need_input()) {
auto slice = input_->prepare_read();
if (slice.empty()) {
if (!is_input_active_) {
gzip_.close_input();
} else {
return result;
}
} else {
gzip_.set_input(input_->prepare_read());
}
}
if (gzip_.need_output()) {
auto slice = output_.prepare_append();
CHECK(!slice.empty());
gzip_.set_output(slice);
}
auto r_state = gzip_.run();
auto output_size = gzip_.flush_output();
if (output_size) {
uncommited_size_ += output_size;
total_output_size_ += output_size;
if (total_output_size_ > max_output_size_) {
finish(Status::Error("Max output size limit exceeded"));
return result;
}
output_.confirm_append(output_size);
result = true;
}
auto input_size = gzip_.flush_input();
if (input_size) {
input_->confirm_read(input_size);
}
if (r_state.is_error()) {
finish(r_state.move_as_error());
return false;
}
auto state = r_state.ok();
if (state == Gzip::State::Done) {
consume_input();
return false;
}
return result;
}
} // namespace td
#endif