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/****************************************************************************
**
** Copyright (C) 1993-2009 NVIDIA Corporation.
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt 3D Studio.
**
** $QT_BEGIN_LICENSE:GPL$
** 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#pragma once
#ifndef QT3DS_RENDER_STR_CONVERT_UTF_H
#define QT3DS_RENDER_STR_CONVERT_UTF_H
#include <EASTL/string.h>
#include "foundation/ConvertUTF.h"
#include "foundation/Qt3DSAssert.h"
#include "foundation/Qt3DSSimpleTypes.h"
namespace qt3ds {
namespace foundation {
using namespace qt3ds;
template <typename TSrcType>
struct ConverterType
{
};
template <>
struct ConverterType<char8_t>
{
typedef UTF8 TConverterType;
};
template <>
struct ConverterType<char16_t>
{
typedef UTF16 TConverterType;
};
template <>
struct ConverterType<char32_t>
{
typedef UTF32 TConverterType;
};
template <QT3DSU32 TWCharSize>
struct WCharType
{
};
template <>
struct WCharType<2>
{
typedef char16_t TCharType;
};
template <>
struct WCharType<4>
{
typedef char32_t TCharType;
};
typedef WCharType<sizeof(wchar_t)> TWCharEASTLConverter;
template <typename TSrcType, typename TDestType>
struct UTFConversionSelector
{
};
template <>
struct UTFConversionSelector<char8_t, char16_t>
{
static ConversionResult Convert(const UTF8 **sourceStart, const UTF8 *sourceEnd,
UTF16 **targetStart, UTF16 *targetEnd,
ConversionFlags flags)
{
return Q3DSConvertUTF8toUTF16(sourceStart, sourceEnd, targetStart, targetEnd, flags);
}
};
template <>
struct UTFConversionSelector<char8_t, char32_t>
{
static ConversionResult Convert(const UTF8 **sourceStart, const UTF8 *sourceEnd,
UTF32 **targetStart, UTF32 *targetEnd,
ConversionFlags flags)
{
return Q3DSConvertUTF8toUTF32(sourceStart, sourceEnd, targetStart, targetEnd, flags);
}
};
template <>
struct UTFConversionSelector<char16_t, char8_t>
{
static ConversionResult Convert(const UTF16 **sourceStart, const UTF16 *sourceEnd,
UTF8 **targetStart, UTF8 *targetEnd, ConversionFlags flags)
{
return Q3DSConvertUTF16toUTF8(sourceStart, sourceEnd, targetStart, targetEnd, flags);
}
};
template <>
struct UTFConversionSelector<char16_t, char32_t>
{
static ConversionResult Convert(const UTF16 **sourceStart, const UTF16 *sourceEnd,
UTF32 **targetStart, UTF32 *targetEnd,
ConversionFlags flags)
{
return Q3DSConvertUTF16toUTF32(sourceStart, sourceEnd, targetStart, targetEnd, flags);
}
};
template <>
struct UTFConversionSelector<char32_t, char8_t>
{
static ConversionResult Convert(const UTF32 **sourceStart, const UTF32 *sourceEnd,
UTF8 **targetStart, UTF8 *targetEnd, ConversionFlags flags)
{
return Q3DSConvertUTF32toUTF8(sourceStart, sourceEnd, targetStart, targetEnd, flags);
}
};
template <>
struct UTFConversionSelector<char32_t, char16_t>
{
static ConversionResult Convert(const UTF32 **sourceStart, const UTF32 *sourceEnd,
UTF16 **targetStart, UTF16 *targetEnd,
ConversionFlags flags)
{
return Q3DSConvertUTF32toUTF16(sourceStart, sourceEnd, targetStart, targetEnd, flags);
}
};
// Convert into an EASTL string type.
// inSrcLen may be zero in which case we analyze the string looking for the zero element.
template <typename TSrcType, typename TDestType, typename TAllocType>
bool ConvertUTF(const TSrcType *inSrc, size_t inSrcLen,
eastl::basic_string<TDestType, TAllocType> &outString)
{
typedef typename ConverterType<TDestType>::TConverterType TDestUTFType;
typedef typename ConverterType<TSrcType>::TConverterType TSrcUTFType;
if (inSrc == 0 || *inSrc == 0) {
outString.clear();
return true;
}
if (inSrcLen == 0) {
// empty loop intentional.
for (const TSrcType *ptr = inSrc; ptr && *ptr; ++ptr, ++inSrcLen) {
}
}
typename eastl::basic_string<TDestType, TAllocType>::size_type capacity =
outString.capacity();
if (capacity == 0)
outString.resize((QT3DSU32)inSrcLen * 2);
else
outString.resize(capacity);
ConversionResult theConversionResult(conversionOK);
TDestUTFType *writePtr = NULL;
do {
writePtr = reinterpret_cast<TDestUTFType *>(const_cast<TDestType *>(outString.data()));
TDestUTFType *writeEnd(writePtr + outString.size());
const TSrcUTFType *readPtr(reinterpret_cast<const TSrcUTFType *>(inSrc));
const TSrcUTFType *readEnd = readPtr + inSrcLen;
theConversionResult = UTFConversionSelector<TSrcType, TDestType>::Convert(
&readPtr, readEnd, &writePtr, writeEnd, lenientConversion);
if (theConversionResult == targetExhausted) {
capacity = outString.capacity() * 2;
outString.resize(capacity);
}
} while (theConversionResult == targetExhausted);
if (theConversionResult == conversionOK) {
TDestUTFType *writeStart =
reinterpret_cast<TDestUTFType *>(const_cast<TDestType *>(outString.data()));
outString.resize((QT3DSU32)(writePtr - writeStart));
return true;
} else {
outString.clear();
QT3DS_ASSERT(false);
return false;
}
}
#ifdef WIDE_IS_DIFFERENT_TYPE_THAN_CHAR16_T
template <typename TDestType, typename TAllocType>
bool ConvertWideUTF(const wchar_t *inSrc, size_t inSrcLen,
eastl::basic_string<TDestType, TAllocType> &outString)
{
return ConvertUTF((const TWCharEASTLConverter::TCharType *)inSrc, inSrcLen, outString);
}
#endif
}
}
#endif
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