quazip是一个QT下实现的压缩和解压库

下载地址：

https://github.com/stachenov/quazip/releases

quazip已经是带了内存中解压和压缩的功能，但是没有封装到JlCompress

在编译quazip时需要JlCompress类中的static bool compressFile(QuaZip* zip, QString fileName, QString fileDest);等几个private函数修改为protected，因为我是继承了JlCompress类，需要使用bool compressFile(QuaZip* zip, QString fileName, QString fileDest);函数。

下面是我实现的JlCompressEx类，只做了将文件压缩到内存中

头文件内容

#pragma once

#include "quazip/JlCompress.h"
#include "quazip/quazip.h"

#include <QBuffer>
#include <QByteArray>

class JlCompressEx : public JlCompress
{
public:
    // 文件压缩到内存buffer，zipIoDevice可以使用QBuffer zipBuffer;
    static bool CompressToBuffer(QString file, QIODevice& zipIoDevice);
    // 内存数据压缩到内存buffer
    static bool CompressToBuffer(QByteArray& sourceData, QString fileName, QIODevice& zipIoDevice);
    // 文件压缩到内存buffer
    static bool CompressToBuffer(QStringList files, QIODevice& zipIoDevice);

public:
    // 压缩数据
    static bool CompressBuffer(QuaZip& zip, QByteArray& sourceData, QString fileName);
};

cpp文件内容

#include "JlCompressEx.h"

bool JlCompressEx::CompressToBuffer(QString file, QIODevice& zipIoDevice)
{
    QuaZip zip(&zipIoDevice);
    //QDir().mkpath(QFileInfo(fileCompressed).absolutePath());
    if (!zip.open(QuaZip::mdCreate))
    {
        return false;
    }
    // 
    if (!compressFile(&zip, file, QFileInfo(file).fileName())) {
        return false;
    }

    // 
    zip.close();
    if (zip.getZipError() != UNZ_OK) {
        return false;
    }

    return true;
}

bool JlCompressEx::CompressToBuffer(QByteArray& sourceData, QString fileName, QIODevice& zipIoDevice)
{
    QuaZip zip(&zipIoDevice);
    //QDir().mkpath(QFileInfo(fileCompressed).absolutePath());
    if (!zip.open(QuaZip::mdCreate))
    {
        return false;
    }

    if (!CompressBuffer(zip, sourceData, fileName))
    {
        return false;
    }

    // 
    zip.close();
    if (zip.getZipError() != UNZ_OK) {
        return false;
    }

    return true;
}

bool JlCompressEx::CompressToBuffer(QStringList files, QIODevice& zipIoDevice)
{
    // 
    QuaZip zip(&zipIoDevice);
    //QDir().mkpath(QFileInfo(fileCompressed).absolutePath());
    if (!zip.open(QuaZip::mdCreate))
    {
        return false;
    }

    // 
    QFileInfo info;
    for (int index = 0; index < files.size(); ++index) {
        const QString & file(files.at(index));
        info.setFile(file);
        if (!info.exists() || !compressFile(&zip, file, info.fileName())) {
            return false;
        }
    }

    // 
    zip.close();
    if (zip.getZipError() != 0)
    {
        return false;
    }

    return true;
}

bool JlCompressEx::CompressBuffer(QuaZip& zip, QByteArray& sourceData, QString fileName)
{
    // 
    if (zip.getMode() != QuaZip::mdCreate &&
        zip.getMode() != QuaZip::mdAppend &&
        zip.getMode() != QuaZip::mdAdd)
    {
        return false;
    }
    // 
    QuaZipFile outFile(&zip);
    if (!outFile.open(QIODevice::WriteOnly, QuaZipNewInfo(fileName)))
    {
        return false;
    }
    // 
    if (outFile.write(sourceData) != sourceData.size())
    {
        return false;
    }
    if (outFile.getZipError() != UNZ_OK)
    {
        return false;
    }

    // 
    outFile.close();
    if (outFile.getZipError() != UNZ_OK)
    {
        return false;
    }

    return true;
}

使用测试

QBuffer zipBuffer;
JlCompressEx::CompressToBuffer(fileData, "data.json", zipBuffer);
QByteArray& bufferArray = zipBuffer.buffer();