Make QHostAddress.toString() follow RFC-5952 for IPv6 address format.

Task-number: QTBUG-18426
Reviewed-by: Peter Hartmann
(cherry picked from commit ebc134db484eee31491836b619aad1ee86e3070e)

2 files changed, 51 insertions, 20 deletions

diff --git a/src/network/kernel/qhostaddress.cpp b/src/network/kernel/qhostaddress.cpp
index ae7d7a1486..4e7c286d80 100644
--- a/src/network/kernel/qhostaddress.cpp
+++ b/src/network/kernel/qhostaddress.cpp
@@ -720,7 +720,8 @@ Q_IPV6ADDR QHostAddress::toIPv6Address() const
     Returns the address as a string.
 
     For example, if the address is the IPv4 address 127.0.0.1, the
-    returned string is "127.0.0.1".
+    returned string is "127.0.0.1". For IPv6 the string format will 
+    follow the RFC5952 recommendation.
 
     \sa toIPv4Address()
 */
@@ -741,8 +742,32 @@ QString QHostAddress::toString() const
             ugle[i] = (quint16(d->a6[2*i]) << 8) | quint16(d->a6[2*i+1]);
         }
         QString s;
-        s.sprintf("%X:%X:%X:%X:%X:%X:%X:%X",
-                  ugle[0], ugle[1], ugle[2], ugle[3], ugle[4], ugle[5], ugle[6], ugle[7]);
+        QString temp;
+        bool zeroDetected = false;
+        bool zeroShortened = false;
+        for (int i = 0; i < 8; i++) {
+            if ((ugle[i] != 0) || zeroShortened) {
+                temp.sprintf("%X", ugle[i]);
+                s.append(temp);
+                if (zeroDetected)
+                    zeroShortened = true;
+            } else {
+                if (!zeroDetected) {
+                    if (i<7 && (ugle[i+1] == 0)) {
+                        s.append(QLatin1Char(':'));
+                        zeroDetected = true;
+                    } else {
+                        temp.sprintf("%X", ugle[i]);
+                        s.append(temp);
+                        if (i<7)
+                            s.append(QLatin1Char(':'));
+                    }
+                }
+            }
+            if (i<7 && ((ugle[i] != 0) || zeroShortened || (i==0 && zeroDetected)))
+                s.append(QLatin1Char(':'));
+        }
+
         if (!d->scopeId.isEmpty())
             s.append(QLatin1Char('%') + d->scopeId);
         return s;
diff --git a/tests/auto/qhostaddress/tst_qhostaddress.cpp b/tests/auto/qhostaddress/tst_qhostaddress.cpp
index bd020aa015..e2043a5012 100644
--- a/tests/auto/qhostaddress/tst_qhostaddress.cpp
+++ b/tests/auto/qhostaddress/tst_qhostaddress.cpp
@@ -164,21 +164,27 @@ void tst_QHostAddress::setAddress_QString_data()
     QTest::newRow("ip4_04")  << QString("255.3.2.1\r ") << (bool)TRUE << QString("255.3.2.1") << 4;
     QTest::newRow("ip4_05")  << QString("0.0.0.0") << (bool)TRUE << QString("0.0.0.0") << 4;
 
-    // for the format of IPv6 addresses see also RFC 1884
+    // for the format of IPv6 addresses see also RFC 5952
     QTest::newRow("ip6_00")  << QString("FEDC:BA98:7654:3210:FEDC:BA98:7654:3210") << (bool)TRUE << QString("FEDC:BA98:7654:3210:FEDC:BA98:7654:3210") << 6;
-    QTest::newRow("ip6_01")  << QString("1080:0000:0000:0000:0008:0800:200C:417A") << (bool)TRUE << QString("1080:0:0:0:8:800:200C:417A") << 6;
-    QTest::newRow("ip6_02")  << QString("1080:0:0:0:8:800:200C:417A") << (bool)TRUE << QString("1080:0:0:0:8:800:200C:417A") << 6;
-    QTest::newRow("ip6_03")  << QString("1080::8:800:200C:417A") << (bool)TRUE << QString("1080:0:0:0:8:800:200C:417A") << 6;
-    QTest::newRow("ip6_04")  << QString("FF01::43") << (bool)TRUE << QString("FF01:0:0:0:0:0:0:43") << 6;
-    QTest::newRow("ip6_05")  << QString("::1") << (bool)TRUE << QString("0:0:0:0:0:0:0:1") << 6;
-    QTest::newRow("ip6_06")  << QString("1::") << (bool)TRUE << QString("1:0:0:0:0:0:0:0") << 6;
-    QTest::newRow("ip6_07")  << QString("::") << (bool)TRUE << QString("0:0:0:0:0:0:0:0") << 6;
-    QTest::newRow("ip6_08")  << QString("0:0:0:0:0:0:13.1.68.3") << (bool)TRUE << QString("0:0:0:0:0:0:D01:4403") << 6;
-    QTest::newRow("ip6_09")  << QString("::13.1.68.3") << (bool)TRUE <<  QString("0:0:0:0:0:0:D01:4403") << 6;
-    QTest::newRow("ip6_10")  << QString("0:0:0:0:0:FFFF:129.144.52.38") << (bool)TRUE << QString("0:0:0:0:0:FFFF:8190:3426") << 6;
-    QTest::newRow("ip6_11")  << QString("::FFFF:129.144.52.38") << (bool)TRUE << QString("0:0:0:0:0:FFFF:8190:3426") << 6;
-    QTest::newRow("ip6_12")  << QString("1::FFFF:129.144.52.38") << (bool)TRUE << QString("1:0:0:0:0:FFFF:8190:3426") << 6;
-    QTest::newRow("ip6_13")  << QString("A:B::D:E") << (bool)TRUE << QString("A:B:0:0:0:0:D:E") << 6;
+    QTest::newRow("ip6_01")  << QString("1080:0000:0000:0000:0008:0800:200C:417A") << (bool)TRUE << QString("1080::8:800:200C:417A") << 6;
+    QTest::newRow("ip6_02")  << QString("1080:0:0:0:8:800:200C:417A") << (bool)TRUE << QString("1080::8:800:200C:417A") << 6;
+    QTest::newRow("ip6_03")  << QString("1080::8:800:200C:417A") << (bool)TRUE << QString("1080::8:800:200C:417A") << 6;
+    QTest::newRow("ip6_04")  << QString("FF01::43") << (bool)TRUE << QString("FF01::43") << 6;
+    QTest::newRow("ip6_05")  << QString("::1") << (bool)TRUE << QString("::1") << 6;
+    QTest::newRow("ip6_06")  << QString("1::") << (bool)TRUE << QString("1::") << 6;
+    QTest::newRow("ip6_07")  << QString("::") << (bool)TRUE << QString("::") << 6;
+    QTest::newRow("ip6_08")  << QString("0:0:0:0:0:0:13.1.68.3") << (bool)TRUE << QString("::D01:4403") << 6;
+    QTest::newRow("ip6_09")  << QString("::13.1.68.3") << (bool)TRUE <<  QString("::D01:4403") << 6;
+    QTest::newRow("ip6_10")  << QString("0:0:0:0:0:FFFF:129.144.52.38") << (bool)TRUE << QString("::FFFF:8190:3426") << 6;
+    QTest::newRow("ip6_11")  << QString("::FFFF:129.144.52.38") << (bool)TRUE << QString("::FFFF:8190:3426") << 6;
+    QTest::newRow("ip6_12")  << QString("1::FFFF:129.144.52.38") << (bool)TRUE << QString("1::FFFF:8190:3426") << 6;
+    QTest::newRow("ip6_13")  << QString("A:B::D:E") << (bool)TRUE << QString("A:B::D:E") << 6;
+    QTest::newRow("ip6_14")  << QString("1080:0:1:0:8:800:200C:417A") << (bool)TRUE << QString("1080:0:1:0:8:800:200C:417A") << 6;
+    QTest::newRow("ip6_15")  << QString("1080:0:1:0:8:800:200C:0") << (bool)TRUE << QString("1080:0:1:0:8:800:200C:0") << 6;
+    QTest::newRow("ip6_16")  << QString("1080:0:1:0:8:800:0:0") << (bool)TRUE << QString("1080:0:1:0:8:800::") << 6;
+    QTest::newRow("ip6_17")  << QString("1080:0:0:0:8:800:0:0") << (bool)TRUE << QString("1080::8:800:0:0") << 6;
+    QTest::newRow("ip6_18")  << QString("0:1:1:1:8:800:0:0") << (bool)TRUE << QString("0:1:1:1:8:800::") << 6;
+    QTest::newRow("ip6_19")  << QString("0:1:1:1:8:800:0:1") << (bool)TRUE << QString("0:1:1:1:8:800:0:1") << 6;
 
     QTest::newRow("error_00")  << QString("foobarcom") << (bool)FALSE << QString() << 0;
     QTest::newRow("error_01")  << QString("foo.bar.com") << (bool)FALSE << QString() << 0;
@@ -329,16 +335,16 @@ void tst_QHostAddress::scopeId()
 {
     QHostAddress address("fe80::2e0:4cff:fefb:662a%eth0");
     QCOMPARE(address.scopeId(), QString("eth0"));
-    QCOMPARE(address.toString().toLower(), QString("fe80:0:0:0:2e0:4cff:fefb:662a%eth0"));
+    QCOMPARE(address.toString().toLower(), QString("fe80::2e0:4cff:fefb:662a%eth0"));
 
     QHostAddress address2("fe80::2e0:4cff:fefb:662a");
     QCOMPARE(address2.scopeId(), QString());
     address2.setScopeId(QString("en0"));
-    QCOMPARE(address2.toString().toLower(), QString("fe80:0:0:0:2e0:4cff:fefb:662a%en0"));
+    QCOMPARE(address2.toString().toLower(), QString("fe80::2e0:4cff:fefb:662a%en0"));
 
     address2 = address;
     QCOMPARE(address2.scopeId(), QString("eth0"));
-    QCOMPARE(address2.toString().toLower(), QString("fe80:0:0:0:2e0:4cff:fefb:662a%eth0"));
+    QCOMPARE(address2.toString().toLower(), QString("fe80::2e0:4cff:fefb:662a%eth0"));
 }
 
 void tst_QHostAddress::hashKey()