Merge the different implementations of toHex in one central place

It's a simple enough function, but we don't need to duplicate those 17
bytes all over the place. Now they'll be duplicated at most once per
library.

Change-Id: Ic995e2a934b005e7e996e70f2ee644bfa948eb38
Reviewed-by: Jason McDonald <macadder1@gmail.com>

src/corelib/io/qipaddress.cpp

@@ -33,6 +33,7 @@
 
 #include "qipaddress_p.h"
 #include "private/qlocale_tools_p.h"
+#include "private/qtools_p.h"
 #include "qvarlengtharray.h"
 
 QT_BEGIN_NAMESPACE
@@ -240,7 +241,7 @@ const QChar *parseIp6(IPv6Address &address, const QChar *begin, const QChar *end
 
 static inline QChar toHex(uchar c)
 {
-    return ushort(c > 9 ? c + 'a' - 0xA : c + '0');
+    return QtMiscUtils::toHexLower(c);
 }
 
 void toString(QString &appendTo, IPv6Address address)

src/corelib/io/qurlrecode.cpp

@@ -33,6 +33,7 @@
 
 #include "qurl.h"
 #include "private/qutfcodec_p.h"
+#include "private/qtools_p.h"
 
 QT_BEGIN_NAMESPACE
 
@@ -197,8 +198,7 @@ static inline ushort decodePercentEncoding(const ushort *input)
 
 static inline ushort encodeNibble(ushort c)
 {
-    static const uchar hexnumbers[] = "0123456789ABCDEF";
-    return hexnumbers[c & 0xf];
+    return ushort(QtMiscUtils::toHexUpper(c));
 }
 
 static void ensureDetached(QString &result, ushort *&output, const ushort *begin, const ushort *input, const ushort *end,

src/corelib/plugin/quuid.cpp

@@ -36,14 +36,13 @@
 #include "qdatastream.h"
 #include "qendian.h"
 #include "qdebug.h"
+#include "private/qtools_p.h"
 
 #ifndef QT_BOOTSTRAPPED
 #include "qcryptographichash.h"
 #endif
 QT_BEGIN_NAMESPACE
 
-static const char digits[] = "0123456789abcdef";
-
 template <class Char, class Integral>
 void _q_toHex(Char *&dst, Integral value)
 {
@@ -52,10 +51,8 @@ void _q_toHex(Char *&dst, Integral value)
     const char* p = reinterpret_cast<const char*>(&value);
 
     for (uint i = 0; i < sizeof(Integral); ++i, dst += 2) {
-        uint j = (p[i] >> 4) & 0xf;
-        dst[0] = Char(digits[j]);
-        j = p[i] & 0xf;
-        dst[1] = Char(digits[j]);
+        dst[0] = Char(QtMiscUtils::toHexLower((p[i] >> 4) & 0xf));
+        dst[1] = Char(QtMiscUtils::toHexLower(p[i] & 0xf));
     }
 }
 

src/corelib/tools/qbytearray.cpp

@@ -4161,16 +4161,8 @@ QByteArray QByteArray::toHex() const
     char *hexData = hex.data();
     const uchar *data = (const uchar *)d->data();
     for (int i = 0; i < d->size; ++i) {
-        int j = (data[i] >> 4) & 0xf;
-        if (j <= 9)
-            hexData[i*2] = (j + '0');
-         else
-            hexData[i*2] = (j + 'a' - 10);
-        j = data[i] & 0xf;
-        if (j <= 9)
-            hexData[i*2+1] = (j + '0');
-         else
-            hexData[i*2+1] = (j + 'a' - 10);
+        hexData[i*2] = QtMiscUtils::toHexLower(data[i] >> 4);
+        hexData[i*2+1] = QtMiscUtils::toHexLower(data[i] & 0xf);
     }
     return hex;
 }
@@ -4365,12 +4357,6 @@ static inline bool q_strchr(const char str[], char chr)
     return false;
 }
 
-static inline char toHexHelper(char c)
-{
-    static const char hexnumbers[] = "0123456789ABCDEF";
-    return hexnumbers[c & 0xf];
-}
-
 static void q_toPercentEncoding(QByteArray *ba, const char *dontEncode, const char *alsoEncode, char percent)
 {
     if (ba->isEmpty())
@@ -4403,8 +4389,8 @@ static void q_toPercentEncoding(QByteArray *ba, const char *dontEncode, const ch
                 output = ba->data();
             }
             output[length++] = percent;
-            output[length++] = toHexHelper((c & 0xf0) >> 4);
-            output[length++] = toHexHelper(c & 0xf);
+            output[length++] = QtMiscUtils::toHexUpper((c & 0xf0) >> 4);
+            output[length++] = QtMiscUtils::toHexUpper(c & 0xf);
         }
     }
     if (output)

src/corelib/tools/qtools_p.h

@@ -50,6 +50,20 @@
 
 QT_BEGIN_NAMESPACE
 
+namespace QtMiscUtils {
+inline char toHexUpper(uint value)
+{
+    static const char hexdigits[] = "0123456789ABCDEF";
+    return hexdigits[value & 0xF];
+}
+
+inline char toHexLower(uint value)
+{
+    static const char hexdigits[] = "0123456789abcdef";
+    return hexdigits[value & 0xF];
+}
+}
+
 // We typically need an extra bit for qNextPowerOfTwo when determining the next allocation size.
 enum {
     MaxAllocSize = (1 << (std::numeric_limits<int>::digits - 1)) - 1

src/testlib/qtestcase.cpp

@@ -47,6 +47,7 @@
 #include <QtCore/qprocess.h>
 #include <QtCore/qdebug.h>
 #include <QtCore/qlibraryinfo.h>
+#include <QtCore/private/qtools_p.h>
 
 #include <QtTest/private/qtestlog_p.h>
 #include <QtTest/private/qtesttable_p.h>
@@ -84,6 +85,8 @@
 
 QT_BEGIN_NAMESPACE
 
+using QtMiscUtils::toHexUpper;
+
 /*!
    \namespace QTest
    \inmodule QtTest
@@ -2060,12 +2063,6 @@ void *fetchData(QTestData *data, const char *tagName, int typeId)
     return data->data(idx);
 }
 
-static char toHex(ushort value)
-{
-    static const char hexdigits[] = "0123456789ABCDEF";
-    return hexdigits[value & 0xF];
-}
-
 /*!
   \fn char* QTest::toHexRepresentation(const char *ba, int length)
 
@@ -2115,9 +2112,9 @@ char *toHexRepresentation(const char *ba, int length)
     while (true) {
         const char at = ba[i];
 
-        result[o] = toHex(at >> 4);
+        result[o] = toHexUpper(at >> 4);
         ++o;
-        result[o] = toHex(at);
+        result[o] = toHexUpper(at);
 
         ++i;
         ++o;
@@ -2183,10 +2180,10 @@ char *toPrettyUnicode(const ushort *p, int length)
             break;
         default:
             *dst++ = 'u';
-            *dst++ = toHex(*p >> 12);
-            *dst++ = toHex(*p >> 8);
-            *dst++ = toHex(*p >> 4);
-            *dst++ = toHex(*p);
+            *dst++ = toHexUpper(*p >> 12);
+            *dst++ = toHexUpper(*p >> 8);
+            *dst++ = toHexUpper(*p >> 4);
+            *dst++ = toHexUpper(*p);
         }
     }