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#include <QByteArray>

#include <QtGlobal>

#include "qbuiltintypes_p.h"

#include "qvalidationerror_p.h"

#include "qbase64binary_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

Base64Binary::Base64Binary(const QByteArray &val) : m_value(val)

{

}

const char Base64Binary::Base64DecMap[128] =

{

     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

     0x00, 0x00, 0x00, 0x3E, 0x00, 0x00, 0x00, 0x3F,

     0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B,

     0x3C, 0x3D, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

     0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,

     0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,

     0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,

     0x17, 0x18, 0x19, 0x00, 0x00, 0x00, 0x00, 0x00,

     0x00, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20,

     0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,

     0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30,

     0x31, 0x32, 0x33, 0x00, 0x00, 0x00, 0x00, 0x00

};

void Base64Binary::base64Decode(const QByteArray &in, QByteArray &out, bool &ok)

{

    out.resize(0);

    if(in.isEmpty())

    {

        ok = false;

        return;

    }

    ok = true;

    int len = in.size(), tail = len;

    const char *const data = in.data();

    unsigned int eqCount = 0;

    // Find the tail end of the actual encoded data even if

    // there is/are trailing CR and/or LF.

    while(data[tail - 1] == '=')

    {

        --tail;

        if(data[tail] != '=')

            len = tail;

        else

            ++eqCount;

    }

    if(eqCount > 2)

    {

        ok = false;

        return;

    }

    unsigned int outIdx = 0;

    const int count = len; // We modify len below

    out.resize((count));

    for(int idx = 0; idx < count; ++idx)

    {

        const unsigned char ch = data[idx];

        if((ch > 47 && ch < 58) ||

            (ch > 64 && ch < 91) ||

            (ch > 96 && ch < 123) ||

            ch == '+' ||

            ch == '/')

        {

            out[outIdx++] = Base64DecMap[ch];

        }

        else if(ch == '=')

        {

            if((idx + 1) == count || data[idx + 1] == '=')

            {

                out[++outIdx] = Base64DecMap[ch];

                continue;

            }

            ok = false;

            return;

        }

        else if(ch == ' ')

        {

            /* One space is ok, and the previously applied whitespace facet(not implemented

             * at this time of writing) have ensured it's only one space, so we assume that. */

            --tail;

            --len;

            continue;

        }

        else

        {

            ok = false;

            return;

        }

    }

    if(outIdx % 4 != 0)

    {

        ok = false;

        return;

    }

    out.resize(len);

    // 4-byte to 3-byte conversion

    len = (tail > (len / 4)) ? tail - (len / 4) : 0;

    int sidx = 0, didx = 0;

    if(len > 1)

    {

      while(didx < len - 2)

      {

          out[didx] =(((out[sidx] << 2) & 255) | ((out[sidx + 1] >> 4) & 003));

          out[didx + 1] =(((out[sidx + 1] << 4) & 255) | ((out[sidx + 2] >> 2) & 017));

          out[didx + 2] =(((out[sidx + 2] << 6) & 255) | (out[sidx + 3] & 077));

          sidx += 4;

          didx += 3;

      }

    }

    if(didx < len)

        out[didx] =(((out[sidx] << 2) & 255) | ((out[sidx + 1] >> 4) & 003));

    if(++didx < len)

        out[didx] =(((out[sidx + 1] << 4) & 255) | ((out[sidx + 2] >> 2) & 017));

    // Resize the output buffer

    if(len == 0 || len < out.size())

      out.resize(len);

}

AtomicValue::Ptr Base64Binary::fromLexical(const QString &str)

{

    const QString simple(str.simplified());

    if(simple.isEmpty())

        return AtomicValue::Ptr(new Base64Binary(QByteArray()));

    bool ok = false;

    QByteArray result;

    base64Decode(simple.toUtf8(), result, ok);

    if(ok)

        return AtomicValue::Ptr(new Base64Binary(result));

    else

        return ValidationError::createError();

}

Base64Binary::Ptr Base64Binary::fromValue(const QByteArray &data)

{

    return Base64Binary::Ptr(new Base64Binary(data));

}

QString Base64Binary::stringValue() const

{

    return QString::fromLatin1(m_value.toBase64().constData());

}

ItemType::Ptr Base64Binary::type() const

{

    return BuiltinTypes::xsBase64Binary;

}

QT_END_NAMESPACE