278 lines
7.0 KiB
C++
278 lines
7.0 KiB
C++
/*
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PIP - Platform Independent Primitives
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File
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Copyright (C) 2018 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 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 General Public License for more details.
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You should have received a copy of the GNU 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 "piincludes_p.h"
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#include "pisharedmemory.h"
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#include "pipropertystorage.h"
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#if defined(LINUX) || defined(MAC_OS)
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# define SHM_POSIX
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#endif
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#ifdef WINDOWS
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#endif
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#if defined(QNX) || defined(ANDROID)
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#endif
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#ifdef MAC_OS
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//# include <fcntl.h>
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#endif
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#ifdef SHM_POSIX
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# include <fcntl.h>
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# include <sys/stat.h>
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# include <sys/mman.h>
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#endif
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/*! \class PISharedMemory
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* \brief Shared memory
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*
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* \section PISharedMemory_sec0 Synopsis
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* This class provide access to local file. You can manipulate
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* binary content or use this class as text stream. To binary
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* access there are function \a read(), \a write(), and many
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* \a writeBinary() functions. For write variables to file in
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* their text representation threr are many "<<" operators.
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*
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* \section PISharedMemory_sec1 Position
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* Each opened file has a read/write position - logical position
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* in the file content you read from or you write to. You can
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* find out current position with function \a pos(). Function
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* \a seek(llong position) move position to position "position",
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* \a seekToBegin() move position to the begin of file,
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* \a seekToEnd() move position to the end of file.
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*
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*/
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REGISTER_DEVICE(PISharedMemory)
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PRIVATE_DEFINITION_START(PISharedMemory)
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PIByteArray name;
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#ifdef WINDOWS
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HANDLE map;
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void * data;
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#endif
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#ifdef SHM_POSIX
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void * data;
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bool owner;
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#endif
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PRIVATE_DEFINITION_END(PISharedMemory)
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PISharedMemory::PISharedMemory(): PIIODevice() {
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initPrivate();
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dsize = 65536;
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}
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PISharedMemory::PISharedMemory(const PIString & shm_name, int size, PIIODevice::DeviceMode mode): PIIODevice(shm_name, mode) {
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initPrivate();
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dsize = size;
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if (!shm_name.isEmpty())
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open();
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}
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bool PISharedMemory::openDevice() {
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close();
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//piCoutObj << "try open" << path() << dsize;
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#ifdef WINDOWS
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PRIVATE->name = ("PIP_SHM_" + path()).toByteArray();
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PRIVATE->name.push_back(0);
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const char * nm = (const char *)PRIVATE->name.data();
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PRIVATE->map = OpenFileMapping(FILE_MAP_ALL_ACCESS, FALSE, nm);
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//piCoutObj << "open map =" << ullong(PRIVATE->map);
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if (!PRIVATE->map) {
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PRIVATE->map = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, (DWORD)dsize, nm);
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//piCoutObj << "create map =" << ullong(PRIVATE->map);
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if (!PRIVATE->map) {
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piCoutObj << "CreateFileMapping error," << errorString();
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return false;
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}
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}
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PRIVATE->data = MapViewOfFile(PRIVATE->map, FILE_MAP_ALL_ACCESS, 0, 0, dsize);
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if (!PRIVATE->data) {
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CloseHandle(PRIVATE->map);
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piCoutObj << "MapViewOfFile error," << errorString();
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return false;
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}
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//piCout << PRIVATE->map << PRIVATE->data;
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#endif
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#ifdef SHM_POSIX
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PRIVATE->name = ("/pip_shm_" + path()).toByteArray();
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PRIVATE->name.push_back(0);
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int fd = shm_open((const char *)PRIVATE->name.data(), O_RDWR, 0777);
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//piCoutObj << "try open" << PICoutManipulators::Hex << fd;
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if (fd < 0) {
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//piCoutObj << "shm_open error," << errorString();
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fd = shm_open((const char *)PRIVATE->name.data(), O_RDWR | O_CREAT, 0777);
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//piCoutObj << "try create" << PICoutManipulators::Hex << (m | O_CREAT) << fd;
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if (fd < 0) {
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piCoutObj << "shm_open error," << errorString();
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return false;
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}
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PRIVATE->owner = true;
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//piCoutObj << "created" << fd;
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}
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if (fd >= 0)
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ftruncate(fd, dsize);
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PRIVATE->data = mmap(0, dsize, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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::close(fd);
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if (PRIVATE->data == MAP_FAILED) {
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piCoutObj << "mmap error," << errorString();
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return false;
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}
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//piCoutObj << "opened" << PRIVATE->data;
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#endif
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return true;
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}
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bool PISharedMemory::closeDevice() {
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#ifdef WINDOWS
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if (PRIVATE->data) UnmapViewOfFile(PRIVATE->data);
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if (PRIVATE->map) CloseHandle(PRIVATE->map);
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#endif
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#ifdef SHM_POSIX
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//piCoutObj << "close" << PIString(PRIVATE->name) << PRIVATE->data;
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if (PRIVATE->data) munmap(PRIVATE->data, dsize);
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if (PRIVATE->owner) {
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//if (!PRIVATE->name.isEmpty()) {
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//piCout << "unlink" << PIString(PRIVATE->name);
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shm_unlink((const char *)PRIVATE->name.data());
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}
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//if (fd > 0)
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#endif
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initPrivate();
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return true;
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}
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PIString PISharedMemory::constructFullPathDevice() const {
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PIString ret;
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ret << path() << ":" << dsize;
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return ret;
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}
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void PISharedMemory::configureFromFullPathDevice(const PIString & full_path) {
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initPrivate();
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PIStringList pl = full_path.split(":");
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for (int i = 0; i < pl.size_s(); ++i) {
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PIString p(pl[i]);
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switch (i) {
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case 0: setPath(p); break;
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case 1: dsize = p.toInt(); break;
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}
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}
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}
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PIPropertyStorage PISharedMemory::constructVariantDevice() const {
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PIPropertyStorage ret;
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ret.addProperty("path", path());
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ret.addProperty("size", dsize);
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return ret;
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}
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void PISharedMemory::configureFromVariantDevice(const PIPropertyStorage & d) {
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setPath(d.propertyValueByName("path").toString());
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setSize(d.propertyValueByName("size").toInt());
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}
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void PISharedMemory::initPrivate() {
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#ifdef WINDOWS
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PRIVATE->map = 0;
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PRIVATE->data = 0;
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#endif
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#ifdef SHM_POSIX
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PRIVATE->data = 0;
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PRIVATE->owner = false;
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#endif
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}
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PIByteArray PISharedMemory::readAll() {
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if (dsize <= 0) return PIByteArray();
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#ifdef WINDOWS
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if (!PRIVATE->data) return PIByteArray();
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#endif
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#ifdef SHM_POSIX
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if (!PRIVATE->data) return PIByteArray();
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#endif
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PIByteArray a(dsize);
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read(a.data(), a.size_s());
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return a;
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}
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llong PISharedMemory::size() const {
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if (isClosed()) return -1;
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return dsize;
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}
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void PISharedMemory::setSize(llong s) {
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bool o = isOpened();
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if (o) close();
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dsize = s;
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if (o) open();
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}
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int PISharedMemory::read(void * read_to, int max_size) {
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return read(read_to, max_size, 0);
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}
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int PISharedMemory::read(void * read_to, int max_size, int offset) {
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#ifdef WINDOWS
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if (!PRIVATE->data) return -1;
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CopyMemory(read_to, &(((char*)(PRIVATE->data))[offset]), max_size);
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return max_size;
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#endif
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#ifdef SHM_POSIX
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if (!PRIVATE->data) return -1;
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memcpy(read_to, &(((char*)(PRIVATE->data))[offset]), max_size);
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return max_size;
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#endif
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return -1;
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}
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int PISharedMemory::write(const void * data, int max_size) {
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return write(data, max_size, 0);
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}
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int PISharedMemory::write(const void * data, int max_size, int offset) {
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#ifdef WINDOWS
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if (!PRIVATE->data) return -1;
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CopyMemory(&(((char*)(PRIVATE->data))[offset]), data, max_size);
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return max_size;
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#endif
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#ifdef SHM_POSIX
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if (!PRIVATE->data) return -1;
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memcpy(&(((char*)(PRIVATE->data))[offset]), data, max_size);
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return max_size;
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#endif
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return -1;
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}
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