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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
****************************************************************************/
#include "qhashedstring_p.h"
QT_BEGIN_NAMESPACE
// Copy of QString's qMemCompare
bool QHashedString::compare(const QChar *lhs, const QChar *rhs, int length)
{
Q_ASSERT(lhs && rhs);
const quint16 *a = (const quint16 *)lhs;
const quint16 *b = (const quint16 *)rhs;
if (a == b || !length)
return true;
union {
const quint16 *w;
const quint32 *d;
quintptr value;
} sa, sb;
sa.w = a;
sb.w = b;
// check alignment
if ((sa.value & 2) == (sb.value & 2)) {
// both addresses have the same alignment
if (sa.value & 2) {
// both addresses are not aligned to 4-bytes boundaries
// compare the first character
if (*sa.w != *sb.w)
return false;
--length;
++sa.w;
++sb.w;
// now both addresses are 4-bytes aligned
}
// both addresses are 4-bytes aligned
// do a fast 32-bit comparison
const quint32 *e = sa.d + (length >> 1);
for ( ; sa.d != e; ++sa.d, ++sb.d) {
if (*sa.d != *sb.d)
return false;
}
// do we have a tail?
return (length & 1) ? *sa.w == *sb.w : true;
} else {
// one of the addresses isn't 4-byte aligned but the other is
const quint16 *e = sa.w + length;
for ( ; sa.w != e; ++sa.w, ++sb.w) {
if (*sa.w != *sb.w)
return false;
}
}
return true;
}
QHashedStringRef QHashedStringRef::mid(int offset, int length) const
{
Q_ASSERT(offset < m_length);
return QHashedStringRef(m_data + offset,
(length == -1 || (offset + length) > m_length)?(m_length - offset):length);
}
QVector<QHashedStringRef> QHashedStringRef::split(const QChar sep) const
{
QVector<QHashedStringRef> ret;
auto curLength = 0;
auto curOffset = m_data;
for (int offset = 0; offset < m_length; ++offset) {
if (*(m_data + offset) == sep) {
ret.push_back({curOffset, curLength});
curOffset = m_data + offset + 1;
curLength = 0;
} else {
++curLength;
}
}
if (curLength > 0)
ret.push_back({curOffset, curLength});
return ret;
}
bool QHashedStringRef::endsWith(const QString &s) const
{
return s.length() < m_length &&
QHashedString::compare(s.constData(), m_data + m_length - s.length(), s.length());
}
bool QHashedStringRef::startsWith(const QString &s) const
{
return s.length() < m_length &&
QHashedString::compare(s.constData(), m_data, s.length());
}
static int findChar(const QChar *str, int len, QChar ch, int from)
{
const ushort *s = (const ushort *)str;
ushort c = ch.unicode();
if (from < 0)
from = qMax(from + len, 0);
if (from < len) {
const ushort *n = s + from - 1;
const ushort *e = s + len;
while (++n != e)
if (*n == c)
return n - s;
}
return -1;
}
int QHashedStringRef::indexOf(const QChar &c, int from) const
{
return findChar(m_data, m_length, c, from);
}
QString QHashedStringRef::toString() const
{
if (m_length == 0)
return QString();
return QString(m_data, m_length);
}
QString QHashedCStringRef::toUtf16() const
{
if (m_length == 0)
return QString();
QString rv;
rv.resize(m_length);
writeUtf16((quint16*)rv.data());
return rv;
}
QT_END_NAMESPACE
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