Fix performance regression

Follow up #19417.
PR #19652.

src/base/http/requestparser.cpp

@@ -208,7 +208,7 @@ bool RequestParser::parseRequestLine(const QString &line)
     const int sepPos = url.indexOf('?');
     const QByteArrayView pathComponent = ((sepPos == -1) ? url : QByteArrayView(url).mid(0, sepPos));
 
-    m_request.path = QString::fromUtf8(QByteArray::fromPercentEncoding(pathComponent.toByteArray()));
+    m_request.path = QString::fromUtf8(QByteArray::fromPercentEncoding(asQByteArray(pathComponent)));
 
     if (sepPos >= 0)
     {
@@ -223,10 +223,11 @@ bool RequestParser::parseRequestLine(const QString &line)
 
             const QByteArrayView nameComponent = param.mid(0, eqCharPos);
             const QByteArrayView valueComponent = param.mid(eqCharPos + 1);
-            const QString paramName = QString::fromUtf8(QByteArray::fromPercentEncoding(nameComponent.toByteArray()).replace('+', ' '));
+            const QString paramName = QString::fromUtf8(
+                QByteArray::fromPercentEncoding(asQByteArray(nameComponent)).replace('+', ' '));
             const QByteArray paramValue = valueComponent.isNull()
                 ? QByteArray("")
-                : QByteArray::fromPercentEncoding(valueComponent.toByteArray()).replace('+', ' ');
+                : QByteArray::fromPercentEncoding(asQByteArray(valueComponent)).replace('+', ' ');
 
             m_request.query[paramName] = paramValue;
         }

src/base/utils/bytearray.cpp

@@ -60,6 +60,13 @@ QList<QByteArrayView> Utils::ByteArray::splitToViews(const QByteArrayView in, co
     return ret;
 }
 
+QByteArray Utils::ByteArray::asQByteArray(const QByteArrayView view)
+{
+    // `QByteArrayView::toByteArray()` will deep copy the data
+    // So we provide our own fast path for appropriate situations/code
+    return QByteArray::fromRawData(view.constData(), view.size());
+}
+
 QByteArray Utils::ByteArray::toBase32(const QByteArray &in)
 {
     const char alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";

src/base/utils/bytearray.h

@@ -39,6 +39,7 @@ namespace Utils::ByteArray
 {
     // Mimic QStringView(in).split(sep, behavior)
     QList<QByteArrayView> splitToViews(QByteArrayView in, QByteArrayView sep, Qt::SplitBehavior behavior = Qt::KeepEmptyParts);
+    QByteArray asQByteArray(QByteArrayView view);
 
     QByteArray toBase32(const QByteArray &in);
 }

src/base/utils/password.cpp

@@ -103,8 +103,8 @@ bool Utils::Password::PBKDF2::verify(const QByteArray &secret, const QByteArray
     if (list.size() != 2)
         return false;
 
-    const QByteArray salt = QByteArray::fromBase64(list[0].toByteArray());
-    const QByteArray key = QByteArray::fromBase64(list[1].toByteArray());
+    const QByteArray salt = QByteArray::fromBase64(Utils::ByteArray::asQByteArray(list[0]));
+    const QByteArray key = QByteArray::fromBase64(Utils::ByteArray::asQByteArray(list[1]));
 
     std::array<unsigned char, 64> outBuf {};
     const int hmacResult = PKCS5_PBKDF2_HMAC(password.constData(), password.size()