Move all the things (YES. Move them.)

Also, implemented some basic modlist logic, to be wired up.

depends/quazip/quagzipfile.cpp

@@ -0,0 +1,141 @@
+#include <QFile>
+
+#include "quagzipfile.h"
+
+class QuaGzipFilePrivate {
+    friend class QuaGzipFile;
+    QString fileName;
+    gzFile gzd;
+    inline QuaGzipFilePrivate(): gzd(NULL) {}
+    inline QuaGzipFilePrivate(const QString &fileName): 
+        fileName(fileName), gzd(NULL) {}
+    template<typename FileId> bool open(FileId id, 
+        QIODevice::OpenMode mode, QString &error);
+    gzFile open(int fd, const char *modeString);
+    gzFile open(const QString &name, const char *modeString);
+};
+
+gzFile QuaGzipFilePrivate::open(const QString &name, const char *modeString)
+{
+    return gzopen(QFile::encodeName(name).constData(), modeString);
+}
+
+gzFile QuaGzipFilePrivate::open(int fd, const char *modeString)
+{
+    return gzdopen(fd, modeString);
+}
+
+template<typename FileId>
+bool QuaGzipFilePrivate::open(FileId id, QIODevice::OpenMode mode, 
+                              QString &error)
+{
+    char modeString[2];
+    modeString[0] = modeString[1] = '\0';
+    if ((mode & QIODevice::ReadOnly) != 0
+            && (mode & QIODevice::WriteOnly) != 0) {
+        error = QuaGzipFile::trUtf8("Opening gzip for both reading"
+            " and writing is not supported");
+        return false;
+    } else if ((mode & QIODevice::ReadOnly) != 0) {
+        modeString[0] = 'r';
+    } else if ((mode & QIODevice::WriteOnly) != 0) {
+        modeString[0] = 'w';
+    } else {
+        error = QuaGzipFile::trUtf8("You can open a gzip either for reading"
+            " or for writing. Which is it?");
+        return false;
+    }
+    gzd = open(id, modeString);
+    if (gzd == NULL) {
+        error = QuaGzipFile::trUtf8("Could not gzopen() file");
+        return false;
+    }
+    return true;
+}
+
+QuaGzipFile::QuaGzipFile():
+d(new QuaGzipFilePrivate())
+{
+}
+
+QuaGzipFile::QuaGzipFile(QObject *parent):
+QIODevice(parent),
+d(new QuaGzipFilePrivate())
+{
+}
+
+QuaGzipFile::QuaGzipFile(const QString &fileName, QObject *parent):
+  QIODevice(parent),
+d(new QuaGzipFilePrivate(fileName))
+{
+}
+
+QuaGzipFile::~QuaGzipFile()
+{
+  if (isOpen()) {
+    close();
+  }
+  delete d;
+}
+
+void QuaGzipFile::setFileName(const QString& fileName)
+{
+    d->fileName = fileName;
+}
+
+QString QuaGzipFile::getFileName() const
+{
+    return d->fileName;
+}
+
+bool QuaGzipFile::isSequential() const
+{
+  return true;
+}
+
+bool QuaGzipFile::open(QIODevice::OpenMode mode)
+{
+    QString error;
+    if (!d->open(d->fileName, mode, error)) {
+        setErrorString(error);
+        return false;
+    }
+    return QIODevice::open(mode);
+}
+
+bool QuaGzipFile::open(int fd, QIODevice::OpenMode mode)
+{
+    QString error;
+    if (!d->open(fd, mode, error)) {
+        setErrorString(error);
+        return false;
+    }
+    return QIODevice::open(mode);
+}
+
+bool QuaGzipFile::flush()
+{
+    return gzflush(d->gzd, Z_SYNC_FLUSH) == Z_OK;
+}
+
+void QuaGzipFile::close()
+{
+  QIODevice::close();
+  gzclose(d->gzd);
+}
+
+qint64 QuaGzipFile::readData(char *data, qint64 maxSize)
+{
+    return gzread(d->gzd, (voidp)data, (unsigned)maxSize);
+}
+
+qint64 QuaGzipFile::writeData(const char *data, qint64 maxSize)
+{
+    if (maxSize == 0)
+        return 0;
+    int written = gzwrite(d->gzd, (voidp)data, (unsigned)maxSize);
+    if (written == 0)
+        return -1;
+    else
+        return written;
+}