Simple Extractor using QArchive (In Memory)

Please refer the full class documentation here.

This simple example extracts a given archive (in memory) supported by libarchive. This examples make file expects that QArchive is installed to the system. (or you can also modify it to use add_subdirectory).

main.cpp

#include <QCoreApplication>
#include <QDebug>
#include <QFileInfo>
#include <QArchive/QArchive>

int main(int ac, char **av)
{
    if(ac == 1) {
        qDebug() << "Usage: " << av[0] << " [ARCHIVE PATH]";
    return 0;
    }

    /* include the class from the namespace. */    
    using QArchive::MemoryExtractor;
    using QArchive::MemoryExtractorOutput;
    using QArchive::MemoryFile;

    QCoreApplication app(ac, av);

    /* Get Archive */
    QFile archive(QString(av[1]));
    if(!archive.open(QIODevice::ReadOnly)) {
    return -1;
    }

    /* Construct MemoryExtractor Object. */
    MemoryExtractor Extractor((QIODevice*)&archive);

    /* Connect Signals with Slots (in this case lambda functions). */
    QObject::connect(&Extractor , &MemoryExtractor::finished ,
    [&](MemoryExtractorOutput *output){
    qInfo() << "Extracted File(s) Successfully!";

    auto files  = output->getFiles();
    for(auto iter = files.begin(),
         end = files.end();
         end != iter;
         ++iter) {
        auto fileInfo = (*iter).fileInformation();
        auto buffer = (*iter).buffer();

        // Display contents if it's a text file.
        qDebug() << "Filename:: " << fileInfo.value("FileName").toString();
        if(QFileInfo(fileInfo.value("FileName").toString()).suffix() == "txt") {
           buffer->open(QIODevice::ReadOnly);
           qDebug() << "Contents:: " << QString(buffer->readAll());
           buffer->close();
        }
    }

    // Only delete this output QObject.
    output->deleteLater();
    app.quit();
    return;
    });
    QObject::connect(&Extractor , &MemoryExtractor::error ,
    [&](short code){
        qInfo() << "An error has occured ::"
                << QArchive::errorCodeToString(code);
        app.quit();
        return;
    });
    
    Extractor.start();
    return app.exec();
}

CMakeLists.txt

CMAKE_MINIMUM_REQUIRED(VERSION 3.17)
project(MemoryExtractor)
    
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(CMAKE_AUTOMOC ON)
   
# Assuming you installed QArchive to the system.     
find_package(QArchive)
    
# Include Directories.
include_directories(.)
include_directories(${CMAKE_BINARY_DIR})

add_executable(MemoryExtractor main.cpp)
target_link_libraries(MemoryExtractor PRIVATE QArchive)

Compilation and Execution

 $ mkdir build
 $ cd build
 $ cmake ..
 $ make -j$(nproc)
 $ ./MemoryExtractor

This Program is created in the examples tree on the official repo.