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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 370 insertions, 0 deletions

diff --git a/src/corelib/global/qendian.h b/src/corelib/global/qendian.h
new file mode 100644
index 0000000000..566307b311
--- /dev/null
+++ b/src/corelib/global/qendian.h
@@ -0,0 +1,370 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QENDIAN_H
+#define QENDIAN_H
+
+#include <QtCore/qglobal.h>
+
+// include stdlib.h and hope that it defines __GLIBC__ for glibc-based systems
+#include <stdlib.h>
+
+#ifdef __GLIBC__
+#include <byteswap.h>
+#endif
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Core)
+
+/*
+ * ENDIAN FUNCTIONS
+*/
+inline void qbswap_helper(const uchar *src, uchar *dest, int size)
+{
+    for (int i = 0; i < size ; ++i) dest[i] = src[size - 1 - i];
+}
+
+/*
+ * qbswap(const T src, const uchar *dest);
+ * Changes the byte order of \a src from big endian to little endian or vice versa
+ * and stores the result in \a dest.
+ * There is no alignment requirements for \a dest.
+*/
+template <typename T> inline void qbswap(const T src, uchar *dest)
+{
+    qbswap_helper(reinterpret_cast<const uchar *>(&src), dest, sizeof(T));
+}
+
+// Used to implement a type-safe and alignment-safe copy operation
+// If you want to avoid the memcopy, you must write specializations for this function
+template <typename T> inline void qToUnaligned(const T src, uchar *dest)
+{
+    qMemCopy(dest, &src, sizeof(T));
+}
+
+/* T qFromLittleEndian(const uchar *src)
+ * This function will read a little-endian encoded value from \a src
+ * and return the value in host-endian encoding.
+ * There is no requirement that \a src must be aligned.
+*/
+#if defined Q_CC_SUN
+inline quint64 qFromLittleEndian_helper(const uchar *src, quint64 *dest)
+{
+    return 0
+        | src[0]
+        | src[1] * Q_UINT64_C(0x0000000000000100)
+        | src[2] * Q_UINT64_C(0x0000000000010000)
+        | src[3] * Q_UINT64_C(0x0000000001000000)
+        | src[4] * Q_UINT64_C(0x0000000100000000)
+        | src[5] * Q_UINT64_C(0x0000010000000000)
+        | src[6] * Q_UINT64_C(0x0001000000000000)
+        | src[7] * Q_UINT64_C(0x0100000000000000);
+}
+
+inline quint32 qFromLittleEndian_helper(const uchar *src, quint32 *dest)
+{
+    return 0
+        | src[0]
+        | src[1] * quint32(0x00000100)
+        | src[2] * quint32(0x00010000)
+        | src[3] * quint32(0x01000000);
+}
+
+inline quint16 qFromLittleEndian_helper(const uchar *src, quint16 *dest)
+{
+    return 0
+        | src[0]
+        | src[1] * 0x0100;
+}
+
+inline qint64 qFromLittleEndian_helper(const uchar *src, qint64 * dest)
+{ return static_cast<qint64>(qFromLittleEndian_helper(src, reinterpret_cast<quint64*>(0))); }
+inline qint32 qFromLittleEndian_helper(const uchar *src, qint32 * dest)
+{ return static_cast<qint32>(qFromLittleEndian_helper(src, reinterpret_cast<quint32*>(0))); }
+inline qint16 qFromLittleEndian_helper(const uchar *src, qint16 * dest)
+{ return static_cast<qint16>(qFromLittleEndian_helper(src, reinterpret_cast<quint16*>(0))); }
+
+template <class T> inline T qFromLittleEndian(const uchar *src)
+{
+    return qFromLittleEndian_helper(src, reinterpret_cast<T*>(0));
+}
+
+#else
+template <typename T> inline T qFromLittleEndian(const uchar *src);
+template <> inline quint64 qFromLittleEndian<quint64>(const uchar *src)
+{
+    return 0
+        | src[0]
+        | src[1] * Q_UINT64_C(0x0000000000000100)
+        | src[2] * Q_UINT64_C(0x0000000000010000)
+        | src[3] * Q_UINT64_C(0x0000000001000000)
+        | src[4] * Q_UINT64_C(0x0000000100000000)
+        | src[5] * Q_UINT64_C(0x0000010000000000)
+        | src[6] * Q_UINT64_C(0x0001000000000000)
+        | src[7] * Q_UINT64_C(0x0100000000000000);
+}
+
+template <> inline quint32 qFromLittleEndian<quint32>(const uchar *src)
+{
+    return 0
+        | src[0]
+        | src[1] * quint32(0x00000100)
+        | src[2] * quint32(0x00010000)
+        | src[3] * quint32(0x01000000);
+}
+
+template <> inline quint16 qFromLittleEndian<quint16>(const uchar *src)
+{
+    return quint16(0
+                   | src[0]
+                   | src[1] * 0x0100);
+}
+
+// signed specializations
+template <> inline qint64 qFromLittleEndian<qint64>(const uchar *src)
+{ return static_cast<qint64>(qFromLittleEndian<quint64>(src)); }
+
+template <> inline qint32 qFromLittleEndian<qint32>(const uchar *src)
+{ return static_cast<qint32>(qFromLittleEndian<quint32>(src)); }
+
+template <> inline qint16 qFromLittleEndian<qint16>(const uchar *src)
+{ return static_cast<qint16>(qFromLittleEndian<quint16>(src)); }
+#endif
+
+/* This function will read a big-endian (also known as network order) encoded value from \a src
+ * and return the value in host-endian encoding.
+ * There is no requirement that \a src must be aligned.
+*/
+#if defined Q_CC_SUN
+inline quint64 qFromBigEndian_helper(const uchar *src, quint64 *dest)
+{
+    return 0
+        | src[7]
+        | src[6] * Q_UINT64_C(0x0000000000000100)
+        | src[5] * Q_UINT64_C(0x0000000000010000)
+        | src[4] * Q_UINT64_C(0x0000000001000000)
+        | src[3] * Q_UINT64_C(0x0000000100000000)
+        | src[2] * Q_UINT64_C(0x0000010000000000)
+        | src[1] * Q_UINT64_C(0x0001000000000000)
+        | src[0] * Q_UINT64_C(0x0100000000000000);
+}
+
+inline quint32 qFromBigEndian_helper(const uchar *src, quint32 * dest)
+{
+    return 0
+        | src[3]
+        | src[2] * quint32(0x00000100)
+        | src[1] * quint32(0x00010000)
+        | src[0] * quint32(0x01000000);
+}
+
+inline quint16 qFromBigEndian_helper(const uchar *src, quint16 * des)
+{
+    return 0
+        | src[1]
+        | src[0] * 0x0100;
+}
+
+
+inline qint64 qFromBigEndian_helper(const uchar *src, qint64 * dest)
+{ return static_cast<qint64>(qFromBigEndian_helper(src, reinterpret_cast<quint64*>(0))); }
+inline qint32 qFromBigEndian_helper(const uchar *src, qint32 * dest)
+{ return static_cast<qint32>(qFromBigEndian_helper(src, reinterpret_cast<quint32*>(0))); }
+inline qint16 qFromBigEndian_helper(const uchar *src, qint16 * dest)
+{ return static_cast<qint16>(qFromBigEndian_helper(src, reinterpret_cast<quint16*>(0))); }
+
+template <class T> inline T qFromBigEndian(const uchar *src)
+{
+    return qFromBigEndian_helper(src, reinterpret_cast<T*>(0));
+}
+
+#else
+template <class T> inline T qFromBigEndian(const uchar *src);
+template<>
+inline quint64 qFromBigEndian<quint64>(const uchar *src)
+{
+    return 0
+        | src[7]
+        | src[6] * Q_UINT64_C(0x0000000000000100)
+        | src[5] * Q_UINT64_C(0x0000000000010000)
+        | src[4] * Q_UINT64_C(0x0000000001000000)
+        | src[3] * Q_UINT64_C(0x0000000100000000)
+        | src[2] * Q_UINT64_C(0x0000010000000000)
+        | src[1] * Q_UINT64_C(0x0001000000000000)
+        | src[0] * Q_UINT64_C(0x0100000000000000);
+}
+
+template<>
+inline quint32 qFromBigEndian<quint32>(const uchar *src)
+{
+    return 0
+        | src[3]
+        | src[2] * quint32(0x00000100)
+        | src[1] * quint32(0x00010000)
+        | src[0] * quint32(0x01000000);
+}
+
+template<>
+inline quint16 qFromBigEndian<quint16>(const uchar *src)
+{
+    return quint16( 0
+                    | src[1]
+                    | src[0] * quint16(0x0100));
+}
+
+
+// signed specializations
+template <> inline qint64 qFromBigEndian<qint64>(const uchar *src)
+{ return static_cast<qint64>(qFromBigEndian<quint64>(src)); }
+
+template <> inline qint32 qFromBigEndian<qint32>(const uchar *src)
+{ return static_cast<qint32>(qFromBigEndian<quint32>(src)); }
+
+template <> inline qint16 qFromBigEndian<qint16>(const uchar *src)
+{ return static_cast<qint16>(qFromBigEndian<quint16>(src)); }
+#endif
+/*
+ * T qbswap(T source).
+ * Changes the byte order of a value from big endian to little endian or vice versa.
+ * This function can be used if you are not concerned about alignment issues,
+ * and it is therefore a bit more convenient and in most cases more efficient.
+*/
+template <typename T> T qbswap(T source);
+
+#ifdef __GLIBC__
+template <> inline quint64 qbswap<quint64>(quint64 source)
+{
+    return bswap_64(source);
+}
+template <> inline quint32 qbswap<quint32>(quint32 source)
+{
+    return bswap_32(source);
+}
+template <> inline quint16 qbswap<quint16>(quint16 source)
+{
+    return bswap_16(source);
+}
+#else
+template <> inline quint64 qbswap<quint64>(quint64 source)
+{
+    return 0
+        | ((source & Q_UINT64_C(0x00000000000000ff)) << 56)
+        | ((source & Q_UINT64_C(0x000000000000ff00)) << 40)
+        | ((source & Q_UINT64_C(0x0000000000ff0000)) << 24)
+        | ((source & Q_UINT64_C(0x00000000ff000000)) << 8)
+        | ((source & Q_UINT64_C(0x000000ff00000000)) >> 8)
+        | ((source & Q_UINT64_C(0x0000ff0000000000)) >> 24)
+        | ((source & Q_UINT64_C(0x00ff000000000000)) >> 40)
+        | ((source & Q_UINT64_C(0xff00000000000000)) >> 56);
+}
+
+template <> inline quint32 qbswap<quint32>(quint32 source)
+{
+    return 0
+        | ((source & 0x000000ff) << 24)
+        | ((source & 0x0000ff00) << 8)
+        | ((source & 0x00ff0000) >> 8)
+        | ((source & 0xff000000) >> 24);
+}
+
+template <> inline quint16 qbswap<quint16>(quint16 source)
+{
+    return quint16( 0
+                    | ((source & 0x00ff) << 8)
+                    | ((source & 0xff00) >> 8) );
+}
+#endif // __GLIBC__
+
+// signed specializations
+template <> inline qint64 qbswap<qint64>(qint64 source)
+{
+    return qbswap<quint64>(quint64(source));
+}
+
+template <> inline qint32 qbswap<qint32>(qint32 source)
+{
+    return qbswap<quint32>(quint32(source));
+}
+
+template <> inline qint16 qbswap<qint16>(qint16 source)
+{
+    return qbswap<quint16>(quint16(source));
+}
+
+#if Q_BYTE_ORDER == Q_BIG_ENDIAN
+
+template <typename T> inline T qToBigEndian(T source)
+{ return source; }
+template <typename T> inline T qFromBigEndian(T source)
+{ return source; }
+template <typename T> inline T qToLittleEndian(T source)
+{ return qbswap<T>(source); }
+template <typename T> inline T qFromLittleEndian(T source)
+{ return qbswap<T>(source); }
+template <typename T> inline void qToBigEndian(T src, uchar *dest)
+{ qToUnaligned<T>(src, dest); }
+template <typename T> inline void qToLittleEndian(T src, uchar *dest)
+{ qbswap<T>(src, dest); }
+#else // Q_LITTLE_ENDIAN
+
+template <typename T> inline T qToBigEndian(T source)
+{ return qbswap<T>(source); }
+template <typename T> inline T qFromBigEndian(T source)
+{ return qbswap<T>(source); }
+template <typename T> inline T qToLittleEndian(T source)
+{ return source; }
+template <typename T> inline T qFromLittleEndian(T source)
+{ return source; }
+template <typename T> inline void qToBigEndian(T src, uchar *dest)
+{ qbswap<T>(src, dest); }
+template <typename T> inline void qToLittleEndian(T src, uchar *dest)
+{ qToUnaligned<T>(src, dest); }
+
+#endif // Q_BYTE_ORDER == Q_BIG_ENDIAN
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QENDIAN_H