HTTP2: port to QByteArrayView where it's trivial

Nothing serious, just was curious and played around a bit, so might as
well merge it.

There's much more here that could be done, but I lack the time to do
it.

Change-Id: Idd4ea09a7a413ed5911ffe16841f3d5c944ec1a5
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

src/network/access/http2/bitstreams.cpp

@@ -99,7 +99,7 @@ void BitOStream::write(quint32 src)
     }
 }
 
-void BitOStream::write(const QByteArray &src, bool compressed)
+void BitOStream::write(QByteArrayView src, bool compressed)
 {
     quint32 byteLen = src.size();
     if (compressed && byteLen) {

src/network/access/http2/bitstreams_p.h

@@ -79,7 +79,7 @@ public:
     // * 32-bit integers
     // * strings
     void write(quint32 src);
-    void write(const QByteArray &src, bool compressed);
+    void write(QByteArrayView src, bool compressed);
 
     quint64 bitLength() const;
     quint64 byteLength() const;

src/network/access/http2/hpacktable.cpp

@@ -52,7 +52,7 @@ QT_BEGIN_NAMESPACE
 namespace HPack
 {
 
-HeaderSize entry_size(const QByteArray &name, const QByteArray &value)
+HeaderSize entry_size(QByteArrayView name, QByteArrayView value)
 {
     // 32 comes from HPACK:
     // "4.1 Calculating Table Size

src/network/access/http2/hpacktable_p.h

@@ -88,7 +88,7 @@ struct Q_AUTOTEST_EXPORT HeaderField
 
 using HeaderSize = QPair<bool, quint32>;
 
-HeaderSize entry_size(const QByteArray &name, const QByteArray &value);
+HeaderSize entry_size(QByteArrayView name, QByteArrayView value);
 
 inline HeaderSize entry_size(const HeaderField &entry)
 {

src/network/access/http2/huffman.cpp

@@ -381,7 +381,7 @@ void write_huffman_code(BitOStream &outputStream, const CodeEntry &code)
 // That's from HPACK's specs - we deal with octets.
 static_assert(std::numeric_limits<uchar>::digits == 8, "octets expected");
 
-quint64 huffman_encoded_bit_length(const QByteArray &inputData)
+quint64 huffman_encoded_bit_length(QByteArrayView inputData)
 {
     quint64 bitLength = 0;
     for (int i = 0, e = inputData.size(); i < e; ++i)
@@ -390,7 +390,7 @@ quint64 huffman_encoded_bit_length(const QByteArray &inputData)
     return bitLength;
 }
 
-void huffman_encode_string(const QByteArray &inputData, BitOStream &outputStream)
+void huffman_encode_string(QByteArrayView inputData, BitOStream &outputStream)
 {
     for (int i = 0, e = inputData.size(); i < e; ++i) {
         const auto value = uchar(inputData[i]);

src/network/access/http2/huffman_p.h

@@ -69,8 +69,8 @@ struct CodeEntry
 
 class BitOStream;
 
-quint64 huffman_encoded_bit_length(const QByteArray &inputData);
-void huffman_encode_string(const QByteArray &inputData, BitOStream &outputStream);
+quint64 huffman_encoded_bit_length(QByteArrayView inputData);
+void huffman_encode_string(QByteArrayView inputData, BitOStream &outputStream);
 
 // PrefixTable:
 // Huffman codes with a small bit length