95 lines
2.6 KiB
C++
95 lines
2.6 KiB
C++
/*
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PIP - Platform Independent Primitives
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PIIODevice that pass write to read
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Ivan Pelipenko peri4ko@yandex.ru
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "pitransparentdevice.h"
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//! \class PITransparentDevice pitransparentdevice.h
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//! \details
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//! \~english
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//! This class pass all data from \a write() function to \a read().
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//! %PITransparentDevice contains internal queue and works in
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//! packets mode. If you write 3 different packets into this device,
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//! read will return this 3 packets.
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//!
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//! \~russian
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//! Этот класс транслирует все данные с метода \a write() на метод
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//! \a read(). %PITransparentDevice содержит внутреннюю очередь и работает
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//! в пакетном режиме. Если запишется 3 различных пакета в устройство,
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//! то чтение вернет по очереди эти 3 пакета.
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//!
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REGISTER_DEVICE(PITransparentDevice)
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PITransparentDevice::PITransparentDevice() {}
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PITransparentDevice::~PITransparentDevice() {
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stop();
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close();
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}
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ssize_t PITransparentDevice::bytesAvailable() const {
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ssize_t ret = 0;
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que_mutex.lock();
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if (que.isNotEmpty()) ret = que.back().size();
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que_mutex.unlock();
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return ret;
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}
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ssize_t PITransparentDevice::readDevice(void * read_to, ssize_t max_size) {
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if (!canRead()) return -1;
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que_mutex.lock();
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if (que.isEmpty()) {
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que_mutex.unlock();
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return 0;
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}
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PIByteArray ba = que.dequeue();
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que_mutex.unlock();
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ssize_t ret = piMini(max_size, ba.size_s());
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memcpy(read_to, ba.data(), ret);
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return ret;
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}
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ssize_t PITransparentDevice::writeDevice(const void * data, ssize_t max_size) {
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if (!canWrite()) return -1;
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que_mutex.lock();
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que.enqueue(PIByteArray(data, max_size));
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que_mutex.unlock();
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return max_size;
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}
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bool PITransparentDevice::openDevice() {
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return true;
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}
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bool PITransparentDevice::closeDevice() {
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que_mutex.lock();
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que.clear();
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que_mutex.unlock();
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return true;
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}
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