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/**
* Copyright (C) 2021-2024 Saturneric <[email protected]>
*
* This file is part of GpgFrontend.
*
* GpgFrontend is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GpgFrontend is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GpgFrontend. If not, see <https://www.gnu.org/licenses/>.
*
* The initial version of the source code is inherited from
* the gpg4usb project, which is under GPL-3.0-or-later.
*
* All the source code of GpgFrontend was modified and released by
* Saturneric <[email protected]> starting on May 12, 2021.
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#include "GFDataExchanger.h"
namespace GpgFrontend {
auto GFDataExchanger::Write(const std::byte* buffer, size_t size) -> ssize_t {
if (close_) return -1;
if (size == 0) return 0;
std::atomic<ssize_t> write_bytes = 0;
std::unique_lock<std::mutex> lock(mutex_);
try {
for (size_t i = 0; i < size; i++) {
if (queue_.size() == static_cast<unsigned long>(queue_max_size_)) {
not_empty_.notify_all();
}
not_full_.wait(lock, [=] {
return queue_.size() < static_cast<unsigned long>(queue_max_size_) ||
close_;
});
if (close_) return -1;
queue_.push(buffer[i]);
write_bytes++;
}
} catch (...) {
FLOG_W(
"gf data exchanger caught exception when it writes to queue, abort...");
}
if (!queue_.empty()) not_empty_.notify_all();
return write_bytes;
}
auto GFDataExchanger::Read(std::byte* buffer, size_t size) -> ssize_t {
std::unique_lock<std::mutex> lock(mutex_);
if (size == 0 || (close_ && queue_.empty())) return 0;
std::atomic<ssize_t> read_bytes = 0;
for (size_t i = 0; i < size; ++i) {
if (queue_.empty()) not_full_.notify_all();
not_empty_.wait(lock, [=] { return !queue_.empty() || close_; });
if (close_ && queue_.empty()) return 0;
buffer[i] = queue_.front();
queue_.pop();
read_bytes++;
}
if (queue_.size() < static_cast<unsigned long>(queue_max_size_)) {
not_full_.notify_all();
}
return read_bytes;
}
void GFDataExchanger::CloseWrite() {
std::unique_lock<std::mutex> const lock(mutex_);
close_ = true;
not_full_.notify_all();
not_empty_.notify_all();
}
GFDataExchanger::GFDataExchanger(ssize_t size) : queue_max_size_(size) {}
} // namespace GpgFrontend
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