Privately introducing QDecompressHelper for network purposes

To support streaming decompression in QNAM.
Will also be used to refactor existing decompression code in QNAM.

Task-number: QTBUG-83269
Change-Id: Iecf3e359734163f15686c949f75d41fa4794a00e
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

7 files changed, 143 insertions, 0 deletions

diff --git a/tests/benchmarks/network/access/CMakeLists.txt b/tests/benchmarks/network/access/CMakeLists.txt
index 58f72cd248..3069505252 100644
--- a/tests/benchmarks/network/access/CMakeLists.txt
+++ b/tests/benchmarks/network/access/CMakeLists.txt
@@ -4,3 +4,6 @@ add_subdirectory(qfile_vs_qnetworkaccessmanager)
 add_subdirectory(qnetworkreply)
 add_subdirectory(qnetworkreply_from_cache)
 add_subdirectory(qnetworkdiskcache)
+if(QT_FEATURE_private_tests)
+    add_subdirectory(qdecompresshelper)
+endif()
diff --git a/tests/benchmarks/network/access/access.pro b/tests/benchmarks/network/access/access.pro
index 46b7a5f44d..fed262601b 100644
--- a/tests/benchmarks/network/access/access.pro
+++ b/tests/benchmarks/network/access/access.pro
@@ -4,3 +4,8 @@ SUBDIRS = \
         qnetworkreply \
         qnetworkreply_from_cache \
         qnetworkdiskcache
+
+qtConfig(private_tests): \
+    SUBDIRS += \
+        qdecompresshelper \
+
diff --git a/tests/benchmarks/network/access/qdecompresshelper/.prev_CMakeLists.txt b/tests/benchmarks/network/access/qdecompresshelper/.prev_CMakeLists.txt
new file mode 100644
index 0000000000..cec7aad7b2
--- /dev/null
+++ b/tests/benchmarks/network/access/qdecompresshelper/.prev_CMakeLists.txt
@@ -0,0 +1,19 @@
+# Generated from qdecompresshelper.pro.
+
+#####################################################################
+## qdecompresshelper Binary:
+#####################################################################
+
+qt_add_executable(qdecompresshelper
+    SOURCES
+        main.cpp
+    DEFINES
+        SRC_DIR="${CMAKE_CURRENT_SOURCE_DIR}"
+    PUBLIC_LIBRARIES
+        Qt::NetworkPrivate
+        Qt::Test
+)
+
+#### Keys ignored in scope 1:.:.:qdecompresshelper.pro:<TRUE>:
+# TEMPLATE = "app"
+# _REQUIREMENTS = "qtConfig(private_tests)"
diff --git a/tests/benchmarks/network/access/qdecompresshelper/50mb.txt.gz b/tests/benchmarks/network/access/qdecompresshelper/50mb.txt.gz
new file mode 100644
index 0000000000..523830dd00
--- /dev/null
+++ b/tests/benchmarks/network/access/qdecompresshelper/50mb.txt.gz
diff --git a/tests/benchmarks/network/access/qdecompresshelper/CMakeLists.txt b/tests/benchmarks/network/access/qdecompresshelper/CMakeLists.txt
new file mode 100644
index 0000000000..af7676b561
--- /dev/null
+++ b/tests/benchmarks/network/access/qdecompresshelper/CMakeLists.txt
@@ -0,0 +1,19 @@
+# Generated from qdecompresshelper.pro.
+
+#####################################################################
+## qdecompresshelper Binary:
+#####################################################################
+
+qt_add_executable(qdecompresshelper
+    SOURCES
+        main.cpp
+    DEFINES
+        SRC_DIR=${CMAKE_CURRENT_SOURCE_DIR} # special case
+    PUBLIC_LIBRARIES
+        Qt::NetworkPrivate
+        Qt::Test
+)
+
+#### Keys ignored in scope 1:.:.:decompresshelper.pro:<TRUE>:
+# TEMPLATE = "app"
+# _REQUIREMENTS = "qtConfig(private_tests)"
diff --git a/tests/benchmarks/network/access/qdecompresshelper/main.cpp b/tests/benchmarks/network/access/qdecompresshelper/main.cpp
new file mode 100644
index 0000000000..a16a9d8c32
--- /dev/null
+++ b/tests/benchmarks/network/access/qdecompresshelper/main.cpp
@@ -0,0 +1,89 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtNetwork/private/qdecompresshelper_p.h>
+
+#include <QtTest/QTest>
+
+class tst_QDecompressHelper : public QObject
+{
+    Q_OBJECT
+private slots:
+
+    void decompress_data();
+    void decompress();
+};
+
+void tst_QDecompressHelper::decompress_data()
+{
+    QTest::addColumn<QByteArray>("encoding");
+    QTest::addColumn<QString>("fileName");
+
+    QString srcDir = QStringLiteral(QT_STRINGIFY(SRC_DIR));
+    srcDir = QDir::fromNativeSeparators(srcDir);
+    if (!srcDir.endsWith("/"))
+        srcDir += "/";
+
+    bool dataAdded = false;
+#ifndef QT_NO_COMPRESS
+    QTest::addRow("gzip") << QByteArray("gzip") << srcDir + QString("50mb.txt.gz");
+    dataAdded = true;
+#endif
+    if (!dataAdded)
+        QSKIP("There's no decompression support");
+}
+
+void tst_QDecompressHelper::decompress()
+{
+    QFETCH(QByteArray, encoding);
+    QFETCH(QString, fileName);
+
+    QFile file { fileName };
+    QVERIFY(file.open(QIODevice::ReadOnly));
+    QBENCHMARK {
+        file.seek(0);
+        QDecompressHelper helper;
+        helper.setEncoding(encoding);
+        QVERIFY(helper.isValid());
+
+        helper.feed(file.readAll());
+
+        qsizetype bytes = 0;
+        while (helper.hasData()) {
+            QByteArray out(64 * 1024, Qt::Uninitialized);
+            qsizetype bytesRead = helper.read(out.data(), out.size());
+            bytes += bytesRead;
+        }
+
+        QCOMPARE(bytes, 50 * 1024 * 1024);
+    }
+}
+
+QTEST_MAIN(tst_QDecompressHelper)
+
+#include "main.moc"
diff --git a/tests/benchmarks/network/access/qdecompresshelper/qdecompresshelper.pro b/tests/benchmarks/network/access/qdecompresshelper/qdecompresshelper.pro
new file mode 100644
index 0000000000..f87442260e
--- /dev/null
+++ b/tests/benchmarks/network/access/qdecompresshelper/qdecompresshelper.pro
@@ -0,0 +1,8 @@
+requires(qtConfig(private_tests))
+TEMPLATE = app
+QT = network-private testlib
+
+SOURCES = main.cpp
+CONFIG += release
+
+DEFINES += SRC_DIR="$$PWD"