/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
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**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL$
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** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
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****************************************************************************/

#include <QtGlobal>

#include "qbase64binary_p.h"
#include "qbuiltintypes_p.h"
#include "qpatternistlocale_p.h"
#include "qvalidationerror_p.h"

#include "qhexbinary_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

HexBinary::HexBinary(const QByteArray &val) : Base64Binary(val)
{
}

qint8 HexBinary::fromHex(const QChar &c)
{
    if(c.unicode() > 'f')
        return -1;

    const char *const range = "0123456789ABCDEFabcdef";

    const char *const in = strchr(range, c.unicode());

    if(!in)
        return -1;

    /* Pointer arithmetic. */
    int digit = in - range;

    if(digit > 15)
        digit -= 6;

    return digit;
}

AtomicValue::Ptr HexBinary::fromLexical(const NamePool::Ptr &np, const QString &str)
{
    const QString lexical(str.trimmed());
    const int len = lexical.length();

    if(len == 0)
        return AtomicValue::Ptr(new HexBinary(QByteArray()));

    if((len & 1) != 0)
    {
        /* Catch a common case. */
        return ValidationError::createError(QtXmlPatterns::tr(
                  "A value of type %1 must contain an even number of "
                  "digits. The value %2 does not.")
                  .arg(formatType(np, BuiltinTypes::xsHexBinary),
                       formatData(QString::number(len))));
    }

    QByteArray val;
    val.resize(len / 2);

    for(int i = 0; i < len / 2; ++i)
    {
        qint8 p1 = fromHex(lexical[i * 2]);
        qint8 p2 = fromHex(lexical[i * 2 + 1]);

        if(p1 == -1 || p2 == -1)
        {
            const QString hex(QString::fromLatin1("%1%2").arg(lexical[i * 2], lexical[i * 2 + 1]));

            return ValidationError::createError(QtXmlPatterns::tr(
                             "%1 is not valid as a value of type %2.")
                             .arg(formatData(hex),
                                  formatType(np, BuiltinTypes::xsHexBinary)));
        }

        val[i] = static_cast<char>(p1 * 16 + p2);
    }
    Q_ASSERT(!val.isEmpty());

    return AtomicValue::Ptr(new HexBinary(val));
}

HexBinary::Ptr HexBinary::fromValue(const QByteArray &data)
{
    return HexBinary::Ptr(new HexBinary(data));
}

QString HexBinary::stringValue() const
{
    static const char s_toHex[] = "0123456789ABCDEF";
    const int len = m_value.count();
    QString result;
    result.reserve(len * 2);

    for(int i = 0; i < len; ++i)
    {
        // This cast is significant.
        const unsigned char val = static_cast<unsigned char>(m_value.at(i));
        result += QLatin1Char(s_toHex[val >> 4]);
        result += QLatin1Char(s_toHex[val & 0x0F]);
    }

    return result;
}

ItemType::Ptr HexBinary::type() const
{
    return BuiltinTypes::xsHexBinary;
}

QT_END_NAMESPACE