launch/installwizard_patch.cpp

/*
The MIT License (MIT)

Copyright (c) 2013 The ioquake Group

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <math.h>
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QtZlib/zlib.h>
#include "installwizard_patch.h"
#include "ui_installwizard_patch.h"
#include "installwizard.h"

struct TarHeader
{
    char name[100];
    char mode[8];
    char uid[8];
    char gid[8];
    char size[12];
    char mtime[12];
    char chksum[8];
    char typeflag;
    char linkname[100];
    char magic[6];
    char version[2];
    char uname[32];
    char gname[32];
    char devmajor[8];
    char devminor[8];
    char prefix[155];
};

InstallWizard_Patch::InstallWizard_Patch(QWidget *parent) :
    QWizardPage(parent),
    ui(new Ui::InstallWizard_Patch),
    patchFile(NULL),
    unzippedPatchFile(NULL),
    networkReply(NULL),
    isCancelled(false),
    isDownloadFinished(false),
    isPatchInstalled(false),
    usePatchFileBuffer(true)
{
    ui->setupUi(this);
}

InstallWizard_Patch::~InstallWizard_Patch()
{
    delete patchFile;
    delete unzippedPatchFile;
    delete ui;
}

void InstallWizard_Patch::initializePage()
{
    isCancelled = isDownloadFinished = isPatchInstalled = false;
    patchFileBuffer.clear();
    usePatchFileBuffer = true;

    patchFile = new QTemporaryFile;
    patchFile->open();

    networkReply = nam.get(QNetworkRequest(QUrl("http://localhost:8080/linuxq3apoint-1.32b-3.x86.run")));
    connect(networkReply, &QNetworkReply::readyRead, this, &InstallWizard_Patch::downloadRead);
    connect(networkReply, &QNetworkReply::downloadProgress, this, &InstallWizard_Patch::downloadProgress);
    connect(networkReply, &QNetworkReply::finished, this, &InstallWizard_Patch::downloadFinished);
}

void InstallWizard_Patch::cleanupPage()
{
    cancel();
}

bool InstallWizard_Patch::isComplete() const
{
    return isDownloadFinished && isPatchInstalled;
}

void InstallWizard_Patch::cancel()
{
    if (isCancelled)
        return;

    delete patchFile;
    patchFile = NULL;
    delete unzippedPatchFile;
    unzippedPatchFile = NULL;

    if (!isDownloadFinished)
        networkReply->abort();

    isCancelled = true;
}

void InstallWizard_Patch::downloadRead()
{
    // Skip the first n bytes, giving a valid tar.gz file.
    if (usePatchFileBuffer)
    {
        const qint64 bytesToSkip = 8251;

        patchFileBuffer.append(networkReply->readAll());

        if (patchFileBuffer.length() > bytesToSkip + 1)
        {
            patchFile->write(&patchFileBuffer.data()[bytesToSkip], patchFileBuffer.length() - bytesToSkip);
            usePatchFileBuffer = false;
            patchFileBuffer.clear();
        }
    }
    else
    {
        patchFile->write(networkReply->readAll());
    }
}

void InstallWizard_Patch::downloadProgress(qint64 bytesRead, qint64 bytesTotal)
{
    ui->lblStatus->setText(QString("Downloading %1MB / %2MB").arg(bytesRead / 1024.0 / 1024.0, 0, 'f', 2).arg(bytesTotal / 1024.0 / 1024.0, 0, 'f', 2));
    ui->pbProgress->setMaximum((int)bytesTotal);
    ui->pbProgress->setValue((int)bytesRead);
}

void InstallWizard_Patch::downloadFinished()
{
    Q_ASSERT(networkReply);

    if (!isCancelled && networkReply->error())
    {
        ui->lblStatus->setText(networkReply->errorString());
        networkReply->abort();
        networkReply->deleteLater();
        isCancelled = true;
        return;
    }

    networkReply->deleteLater();

    if (isCancelled)
        return;

    isDownloadFinished = true;

    // Extract gzip compressed archive.
    ui->lblStatus->setText("Installing...");

    z_stream zstream;
    zstream.zalloc = Z_NULL;
    zstream.zfree = Z_NULL;
    zstream.opaque = Z_NULL;
    zstream.avail_in = 0;
    zstream.next_in = Z_NULL;

    int result = inflateInit2(&zstream, 32 | MAX_WBITS);

    if (result != Z_OK)
    {
        ui->lblStatus->setText("zlib inflateInit2 failed");
        cancel();
        return;
    }

    patchFile->seek(0);
    unzippedPatchFile = new QTemporaryFile;
    unzippedPatchFile->open();

    const int bufferSize = 32 * 1024;
    static char inputBuffer[bufferSize];
    static char outputBuffer[bufferSize];

    do
    {
        qint64 bytesRead = patchFile->read(inputBuffer, bufferSize);

        if (bytesRead == 0)
            break;

        zstream.avail_in = bytesRead;
        zstream.next_in = (z_Bytef *)inputBuffer;

        do
        {
            zstream.avail_out = bufferSize;
            zstream.next_out = (z_Bytef *)outputBuffer;

            result = inflate(&zstream, Z_NO_FLUSH);

            if (result != Z_OK && result != Z_STREAM_END)
            {
                ui->lblStatus->setText(QString("zlib error %1").arg(result));
                inflateEnd(&zstream);
                cancel();
                return;
            }

            unzippedPatchFile->write(outputBuffer, bufferSize - zstream.avail_out);
        }
        while (zstream.avail_out == 0);
    }
    while (result != Z_STREAM_END);

    inflateEnd(&zstream);

    // Extract all the baseq3 pk3 files in the TAR file.
    unzippedPatchFile->seek(0);
    int nPaksExtracted = 0;

    for (;;)
    {
        // Read TAR file header (padded to 512 bytes).
        TarHeader header;
        unzippedPatchFile->read((char *)&header, sizeof(header));
        unzippedPatchFile->seek(unzippedPatchFile->pos() + 512 - sizeof(header));

        // Convert size from octal string.
        qint64 size = 0;
        int exponent = 0;

        for (int i = sizeof(header.size) - 1; i >= 0; i--)
        {
            int digit = (int)(header.size[i] - '0');

            if (digit < 0 || digit > 7)
                continue;

            size += qint64(digit * pow(8.0f, exponent));
            exponent++;
        }

        // Extract a pk3 file.
        const char *pakPrefix = "baseq3/pak";

        if (strncmp(header.name, pakPrefix, strlen(pakPrefix)) == 0)
        {
            QString filename(((InstallWizard *)wizard())->getQuakePath());
            filename.append('/');
            filename.append(header.name);

            QFile file(filename);

            if (!file.open(QIODevice::WriteOnly))
            {
                ui->lblStatus->setText(QString("Error opening '%1' for writing").arg(filename));
                cancel();
                return;
            }

            qint64 totalBytesRead = 0;

            for (;;)
            {
                qint64 bytesToRead = bufferSize;

                if (totalBytesRead + bytesToRead > size)
                {
                    bytesToRead = size - totalBytesRead;
                }

                const qint64 bytesRead = unzippedPatchFile->read(outputBuffer, bytesToRead);

                if (bytesRead == 0)
                    break;

                file.write(outputBuffer, bytesRead);
                totalBytesRead += bytesRead;
            }

            nPaksExtracted++;
        }
        else
        {
            unzippedPatchFile->seek(unzippedPatchFile->pos() + size);
        }

        // TAR file size is padded to 512 byte blocks.
        unzippedPatchFile->seek(unzippedPatchFile->pos() + ((size % 512) == 0 ? 0 : 512 - (size % 512)));

        if (nPaksExtracted == 8)
            break;
    }

    isPatchInstalled = true;
    emit completeChanged();
    wizard()->next();
}