QUtf32 Struct Reference

#include <qutfcodec_p.h>

Static Public Functions
static QByteArray	convertFromUnicode (const QChar *, int, QTextCodec::ConverterState *, DataEndianness=DetectEndianness)
static QString	convertToUnicode (const char *, int, QTextCodec::ConverterState *, DataEndianness=DetectEndianness)

Detailed Description

Definition at line 80 of file qutfcodec_p.h.

Functions

convertFromUnicode()

QByteArray QUtf32::convertFromUnicode ( const QChar *  uc, int  len, QTextCodec::ConverterState *  state, DataEndianness  e = DetectEndianness  )

static

Definition at line 388 of file qutfcodec.cpp.

Referenced by QUtf32Codec::convertFromUnicode().

{
    DataEndianness endian = e;
    int length =  4*len;
    if (!state || (!(state->flags & QTextCodec::IgnoreHeader))) {
        length += 4;
    }
    if (e == DetectEndianness) {
        endian = (QSysInfo::ByteOrder == QSysInfo::BigEndian) ? BigEndianness : LittleEndianness;
    }

    QByteArray d(length, Qt::Uninitialized);
    char *data = d.data();
    if (!state || !(state->flags & QTextCodec::IgnoreHeader)) {
        if (endian == BigEndianness) {
            data[0] = 0;
            data[1] = 0;
            data[2] = (char)0xfe;
            data[3] = (char)0xff;
        } else {
            data[0] = (char)0xff;
            data[1] = (char)0xfe;
            data[2] = 0;
            data[3] = 0;
        }
        data += 4;
    }
    if (endian == BigEndianness) {
        for (int i = 0; i < len; ++i) {
            uint cp = uc[i].unicode();
            if (uc[i].isHighSurrogate() && i < len - 1)
                cp = QChar::surrogateToUcs4(cp, uc[++i].unicode());
            *(data++) = cp >> 24;
            *(data++) = (cp >> 16) & 0xff;
            *(data++) = (cp >> 8) & 0xff;
            *(data++) = cp & 0xff;
        }
    } else {
        for (int i = 0; i < len; ++i) {
            uint cp = uc[i].unicode();
            if (uc[i].isHighSurrogate() && i < len - 1)
                cp = QChar::surrogateToUcs4(cp, uc[++i].unicode());
            *(data++) = cp & 0xff;
            *(data++) = (cp >> 8) & 0xff;
            *(data++) = (cp >> 16) & 0xff;
            *(data++) = cp >> 24;
        }
    }

    if (state) {
        state->remainingChars = 0;
        state->flags |= QTextCodec::IgnoreHeader;
    }
    return d;
}

convertToUnicode()

QString QUtf32::convertToUnicode ( const char *  chars, int  len, QTextCodec::ConverterState *  state, DataEndianness  e = DetectEndianness  )

static

Definition at line 444 of file qutfcodec.cpp.

Referenced by QUtf32Codec::convertToUnicode(), and QString::fromUcs4().

{
    DataEndianness endian = e;
    uchar tuple[4];
    int num = 0;
    bool headerdone = false;
    if (state) {
        headerdone = state->flags & QTextCodec::IgnoreHeader;
        if (endian == DetectEndianness) {
            endian = (DataEndianness)state->state_data[Endian];
        }
        num = state->remainingChars;
        memcpy(tuple, &state->state_data[Data], 4);
    }
    if (headerdone && endian == DetectEndianness)
        endian = (QSysInfo::ByteOrder == QSysInfo::BigEndian) ? BigEndianness : LittleEndianness;

    QString result;
    result.resize((num + len) >> 2 << 1); // worst case
    QChar *qch = (QChar *)result.unicode();

    const char *end = chars + len;
    while (chars < end) {
        tuple[num++] = *chars++;
        if (num == 4) {
            if (!headerdone) {
                if (endian == DetectEndianness) {
                    if (endian == DetectEndianness) {
                        if (tuple[0] == 0xff && tuple[1] == 0xfe && tuple[2] == 0 && tuple[3] == 0 && endian != BigEndianness) {
                            endian = LittleEndianness;
                            num = 0;
                            continue;
                        } else if (tuple[0] == 0 && tuple[1] == 0 && tuple[2] == 0xfe && tuple[3] == 0xff && endian != LittleEndianness) {
                            endian = BigEndianness;
                            num = 0;
                            continue;
                        } else if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
                            endian = BigEndianness;
                        } else {
                            endian = LittleEndianness;
                        }
                    }
                } else if (((endian == BigEndianness) ? qFromBigEndian<quint32>(tuple) : qFromLittleEndian<quint32>(tuple)) == QChar::ByteOrderMark) {
                    num = 0;
                    continue;
                }
            }
            uint code = (endian == BigEndianness) ? qFromBigEndian<quint32>(tuple) : qFromLittleEndian<quint32>(tuple);
            if (code >= 0x10000) {
                *qch++ = QChar::highSurrogate(code);
                *qch++ = QChar::lowSurrogate(code);
            } else {
                *qch++ = code;
            }
            num = 0;
        }
    }
    result.truncate(qch - result.unicode());

    if (state) {
        if (headerdone)
            state->flags |= QTextCodec::IgnoreHeader;
        state->state_data[Endian] = endian;
        state->remainingChars = num;
        memcpy(&state->state_data[Data], tuple, 4);
    }
    return result;
}

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The documentation for this struct was generated from the following files:

• /src/corelib/codecs/qutfcodec_p.h
• /src/corelib/codecs/qutfcodec.cpp