QCryptographicHash: allow to hash the content of a QIODevice

This adds a new function (and tests) to give the possibility of doing a
QCryptographicHash of a QIODevice, like a QFile or whatever people
needs.

It is a quite handy overload in many cases.

Change-Id: I22fd272f05571844641b3daefcc6746be4e5c7c3
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/tools/qcryptographichash.cpp

@@ -50,6 +50,7 @@
 #include "../../3rdparty/md4/md4.h"
 #include "../../3rdparty/md4/md4.cpp"
 #include "../../3rdparty/sha1/sha1.cpp"
+#include <qiodevice.h>
 
 
 QT_BEGIN_NAMESPACE
@@ -154,6 +155,28 @@ void QCryptographicHash::addData(const QByteArray &data)
     addData(data.constData(), data.length());
 }
 
+/*!
+  Reads the data from the open QIODevice \a device until it ends
+  and hashes it. Returns true if reading was successful.
+ */
+bool QCryptographicHash::addData(QIODevice* device)
+{
+    if (!device->isReadable())
+        return false;
+
+    if (!device->isOpen())
+        return false;
+
+    char buffer[1024];
+    int length;
+
+    while ((length = device->read(buffer,sizeof(buffer))) > 0)
+        addData(buffer,length);
+
+    return device->atEnd();
+}
+
+
 /*!
   Returns the final hash value.
 

src/corelib/tools/qcryptographichash.h

@@ -51,6 +51,7 @@ QT_BEGIN_NAMESPACE
 QT_MODULE(Core)
 
 class QCryptographicHashPrivate;
+class QIODevice;
 
 class Q_CORE_EXPORT QCryptographicHash
 {
@@ -68,6 +69,7 @@ public:
 
     void addData(const char *data, int length);
     void addData(const QByteArray &data);
+    bool addData(QIODevice* device);
 
     QByteArray result() const;
 

tests/auto/corelib/tools/qcryptographichash/qcryptographichash.pro

@@ -2,3 +2,15 @@ CONFIG += testcase parallel_test
 TARGET = tst_qcryptographichash
 QT = core testlib
 SOURCES = tst_qcryptographichash.cpp
+
+
+wince* {
+   addFiles.files = data/*
+   addFiles.path = data/
+   DEPLOYMENT += addFiles
+
+   DEFINES += SRCDIR=\\\".\\\"
+}
+else {
+    DEFINES += SRCDIR=\\\"$$PWD/\\\"
+}

tests/auto/corelib/tools/qcryptographichash/tst_qcryptographichash.cpp

@@ -51,6 +51,8 @@ private slots:
     void intermediary_result_data();
     void intermediary_result();
     void sha1();
+    void files_data();
+    void files();
 };
 #include <QtCore>
 
@@ -150,5 +152,35 @@ void tst_QCryptographicHash::sha1()
 }
 
 
+Q_DECLARE_METATYPE(QCryptographicHash::Algorithm);
+
+void tst_QCryptographicHash::files_data() {
+    QTest::addColumn<QString>("filename");
+    QTest::addColumn<QCryptographicHash::Algorithm>("algorithm");
+    QTest::addColumn<QByteArray>("md5sum");
+    QTest::newRow("Line") << QString::fromAscii("data/2c1517dad3678f03917f15849b052fd5.md5") << QCryptographicHash::Md5 << QByteArray("2c1517dad3678f03917f15849b052fd5");
+    QTest::newRow("Line") << QString::fromAscii("data/d41d8cd98f00b204e9800998ecf8427e.md5") << QCryptographicHash::Md5 << QByteArray("d41d8cd98f00b204e9800998ecf8427e");
+}
+
+
+void tst_QCryptographicHash::files()
+{
+    QFETCH(QString, filename);
+    QFETCH(QCryptographicHash::Algorithm, algorithm);
+    QFETCH(QByteArray, md5sum);
+    {
+        QFile f(QString::fromLocal8Bit(SRCDIR) + filename);
+        QCryptographicHash hash(algorithm);
+        QVERIFY(! hash.addData(&f)); // file is not open for reading;
+        if (f.open(QIODevice::ReadOnly)) {
+            QVERIFY(hash.addData(&f));
+            QCOMPARE(hash.result().toHex(),md5sum);
+        } else {
+            QFAIL("Failed to open file for testing. should not happen");
+        }
+    }
+}
+
+
 QTEST_MAIN(tst_QCryptographicHash)
 #include "tst_qcryptographichash.moc"