src/corelib/io/qtextstream.cpp

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/****************************************************************************
**
** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
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**
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** review the following information:
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//#define QTEXTSTREAM_DEBUG
static const int QTEXTSTREAM_BUFFERSIZE = 16384;

#include "qtextstream.h"
#include "qbuffer.h"
#include "qfile.h"
#ifndef QT_NO_TEXTCODEC
#include "qtextcodec.h"
#endif
#ifndef Q_OS_TEMP
#include <locale.h>
#endif

#include <stdlib.h>

#if defined QTEXTSTREAM_DEBUG
#include <ctype.h>

// Returns a human readable representation of the first \a len
// characters in \a data.
static QByteArray qt_prettyDebug(const char *data, int len, int maxSize)
{
    if (!data) return "(null)";
    QByteArray out;
    for (int i = 0; i < len; ++i) {
        char c = data[i];
        if (isprint(c)) {
            out += c;
        } else switch (c) {
        case '\n': out += "\\n"; break;
        case '\r': out += "\\r"; break;
        case '\t': out += "\\t"; break;
        default:
            QString tmp;
            tmp.sprintf("\\x%x", (unsigned int)(unsigned char)c);
            out += tmp.toLatin1();
        }
    }

    if (len < maxSize)
        out += "...";

    return out;
}
#endif

// A precondition macro
#define Q_VOID
#define CHECK_VALID_STREAM(x) do { \
    if (!d->string && !d->device) { \
        qWarning("QTextStream: No device"); \
        return x; \
    } } while (0)

// Base implementations of operator>> for ints and reals
#define IMPLEMENT_STREAM_RIGHT_INT_OPERATOR(type) do { \
    Q_D(QTextStream); \
    CHECK_VALID_STREAM(*this); \
    qulonglong tmp; \
    switch (d->getNumber(&tmp)) { \
    case QTextStreamPrivate::npsOk: \
        i = (type)tmp; \
        break; \
    case QTextStreamPrivate::npsMissingDigit: \
    case QTextStreamPrivate::npsInvalidPrefix: \
        i = (type)0; \
        setStatus(atEnd() ? QTextStream::ReadPastEnd : QTextStream::ReadCorruptData); \
        break; \
    } \
    return *this; } while (0)

#define IMPLEMENT_STREAM_RIGHT_REAL_OPERATOR(type) do { \
    Q_D(QTextStream); \
    CHECK_VALID_STREAM(*this); \
    double tmp; \
    if (d->getReal(&tmp)) { \
        f = (type)tmp; \
    } else { \
        f = (type)0; \
        setStatus(atEnd() ? QTextStream::ReadPastEnd : QTextStream::ReadCorruptData); \
    } \
    return *this; } while (0)

#ifndef QT_NO_QOBJECT
class QDeviceClosedNotifier : public QObject
{
    Q_OBJECT
public:
    inline QDeviceClosedNotifier()
    { }

    inline void setupDevice(QTextStream *stream, QIODevice *device)
    {
        disconnect();
        if (device)
            connect(device, SIGNAL(aboutToClose()), this, SLOT(flushStream()));
        this->stream = stream;
    }

public slots:
    inline void flushStream() { stream->flush(); }

private:
    QTextStream *stream;
};
#endif

//-------------------------------------------------------------------
class QTextStreamPrivate
{
    Q_DECLARE_PUBLIC(QTextStream)
public:
    QTextStreamPrivate(QTextStream *q_ptr);
    ~QTextStreamPrivate();
    void reset();

    // device
    QIODevice *device;
#ifndef QT_NO_QOBJECT
    QDeviceClosedNotifier deviceClosedNotifier;
#endif
    bool deleteDevice;

    // string
    QString *string;
    int stringOffset;
    QIODevice::OpenMode stringOpenMode;

#ifndef QT_NO_TEXTCODEC
    // codec
    QTextCodec *codec;
    QTextCodec::ConverterState readConverterState;
    QTextCodec::ConverterState writeConverterState;
    bool autoDetectUnicode;
#endif

    // i/o
    enum TokenDelimiter {
        Space,
        NotSpace,
        EndOfLine,
        EndOfFile
    };

    bool scan(const QChar **ptr, int *tokenLength,
              int maxlen, TokenDelimiter delimiter);
    inline const QChar *readPtr() const;
    inline void consumeLastToken();
    inline void consume(int nchars);
    int lastTokenSize;

    // Return value type for getNumber()
    enum NumberParsingStatus {
        npsOk,
        npsMissingDigit,
        npsInvalidPrefix
    };

    inline bool write(const QString &data);
    inline bool getChar(QChar *ch);
    inline void ungetChar(const QChar &ch);
    NumberParsingStatus getNumber(qulonglong *l);
    bool getReal(double *f);

    bool putNumber(qulonglong number, bool negative);
    inline bool putString(const QString &ch);

    // buffers
    bool fillReadBuffer(qint64 maxBytes = -1);
    bool flushWriteBuffer();
    QString writeBuffer;
    QString readBuffer;
    int readBufferOffset;
    qint64 readBufferStartDevicePos;
    QString endOfBufferState;
#ifndef QT_NO_TEXTCODEC
    QTextCodec::ConverterState readBufferStartReadConverterState;
#endif
    QString readBufferStartEndOfBufferState;

    // streaming parameters
    int realNumberPrecision;
    int integerBase;
    int fieldWidth;
    QChar padChar;
    QTextStream::FieldAlignment fieldAlignment;
    QTextStream::RealNumberNotation realNumberNotation;
    QTextStream::NumberFlags numberFlags;

    // status
    QTextStream::Status status;

    QTextStream *q_ptr;
};

QTextStreamPrivate::QTextStreamPrivate(QTextStream *q_ptr)
{
    this->q_ptr = q_ptr;
    reset();
}

QTextStreamPrivate::~QTextStreamPrivate()
{
    if (deleteDevice)
        delete device;
}

#ifndef QT_NO_TEXTCODEC
static void resetCodecConverterState(QTextCodec::ConverterState *state) {
    state->flags = QTextCodec::DefaultConversion;
    state->remainingChars = state->invalidChars =
           state->state_data[0] = state->state_data[1] = state->state_data[2] = 0;
    if (state->d) qFree(state->d);
    state->d = 0;
}

static void copyConverterState(QTextCodec::ConverterState *dest, const QTextCodec::ConverterState *src)
{
    // ### QTextCodec::ConverterState's copy constructors and assignments are
    // private. This function copies the structure manually.
    dest->flags = src->flags;
    dest->invalidChars = src->invalidChars;
    dest->state_data[0] = src->state_data[0];
    dest->state_data[1] = src->state_data[1];
    dest->state_data[2] = src->state_data[2];
    dest->d = src->d; // <- ### wrong?
}
#endif

void QTextStreamPrivate::reset()
{
    realNumberPrecision = 6;
    integerBase = 0;
    fieldWidth = 0;
    padChar = QLatin1Char(' ');
    fieldAlignment = QTextStream::AlignRight;
    realNumberNotation = QTextStream::SmartNotation;
    numberFlags = 0;

    device = 0;
    deleteDevice = false;
    string = 0;
    stringOffset = 0;
    stringOpenMode = QIODevice::NotOpen;

    readBufferOffset = 0;
    readBufferStartDevicePos = 0;
    endOfBufferState.clear();
    lastTokenSize = 0;

#ifndef QT_NO_TEXTCODEC
    codec = QTextCodec::codecForLocale();
    ::resetCodecConverterState(&readConverterState);
    ::resetCodecConverterState(&writeConverterState);
    ::resetCodecConverterState(&readBufferStartReadConverterState);
    writeConverterState.flags |= QTextCodec::IgnoreHeader;
    autoDetectUnicode = true;
#endif
}

bool QTextStreamPrivate::fillReadBuffer(qint64 maxBytes)
{
    // no buffer next to the QString itself; this function should only
    // be called internally, for devices.
    Q_ASSERT(!string);
    Q_ASSERT(device);

    // handle text translation and bypass the Text flag in the device.
    bool textModeEnabled = device->isTextModeEnabled();
    if (textModeEnabled)
        device->setTextModeEnabled(false);

#ifndef QT_NO_TEXTCODEC
    // codec auto detection, explicitly defaults to locale encoding if
    // the codec has been set to 0.
    if (!codec || autoDetectUnicode) {
        autoDetectUnicode = false;

        char bomBuffer[2];
        if (device->peek(bomBuffer, 2) == 2 && (uchar(bomBuffer[0]) == 0xff && uchar(bomBuffer[1]) == 0xfe
                                                || uchar(bomBuffer[0]) == 0xfe && uchar(bomBuffer[1]) == 0xff)) {
            codec = QTextCodec::codecForName("UTF-16");
        } else if (!codec) {
            codec = QTextCodec::codecForLocale();
            writeConverterState.flags |= QTextCodec::IgnoreHeader;
        }
    }
#if defined (QTEXTSTREAM_DEBUG)
    qDebug("QTextStreamPrivate::fillReadBuffer(), using %s codec",
           codec->name().constData());
#endif
#endif

    // read raw data into a temporary buffer
    char buf[QTEXTSTREAM_BUFFERSIZE];
    qint64 bytesRead = 0;
#if defined(Q_OS_WIN)
    // On Windows, there is no non-blocking stdin - so we fall back to reading
    // lines instead. If there is no QOBJECT, we read lines for all sequential
    // devices; otherwise, we read lines only for stdin.
    QFile *file = 0;
    Q_UNUSED(file);
    if (device->isSequential()
#if !defined(QT_NO_QOBJECT)
        && (file = qobject_cast<QFile *>(device)) && file->handle() == 0
#endif
        ) {
        if (maxBytes != -1)
            bytesRead = device->readLine(buf, qMin<qint64>(sizeof(buf), maxBytes));
        else
            bytesRead = device->readLine(buf, sizeof(buf));
    } else
#endif
    {
        if (maxBytes != -1)
            bytesRead = device->read(buf, qMin<qint64>(sizeof(buf), maxBytes));
        else
            bytesRead = device->read(buf, sizeof(buf));
    }

#if defined (QTEXTSTREAM_DEBUG)
    qDebug("QTextStreamPrivate::fillReadBuffer(), device->read(\"%s\", %d) == %d",
           qt_prettyDebug(buf, qMin(32,int(bytesRead)) , int(bytesRead)).constData(), sizeof(buf), int(bytesRead));
#endif
    if (bytesRead <= 0)
        return false;

    int oldReadBufferSize = readBuffer.size();
    readBuffer += endOfBufferState;
#ifndef QT_NO_TEXTCODEC
    // convert to unicode
    readBuffer += codec->toUnicode(buf, bytesRead, &readConverterState);
#else
    readBuffer += QString(QByteArray(buf, bytesRead));
#endif

    // reset the Text flag.
    if (textModeEnabled)
        device->setTextModeEnabled(true);

    // remove all '\r\n' in the string.
    if (readBuffer.size() > oldReadBufferSize && textModeEnabled) {
        QChar CR = QLatin1Char('\r');
        QChar LF = QLatin1Char('\n');
        QChar *writePtr = readBuffer.data();
        QChar *readPtr = readBuffer.data();
        QChar *endPtr = readBuffer.data() + readBuffer.size();

        int n = 0;
        while (readPtr < endPtr) {
            if (readPtr + 1 < endPtr && *readPtr == CR && *(readPtr + 1) == LF) {
                *writePtr = LF;
                if (n < readBufferOffset)
                    --readBufferOffset;
                ++readPtr;
            } else  if (readPtr != writePtr) {
                *writePtr = *readPtr;
            }

            ++n;
            ++writePtr;
            ++readPtr;
        }
        readBuffer.resize(writePtr - readBuffer.data());

        if (readBuffer.endsWith(QLatin1Char('\r')) && !device->atEnd()) {
            endOfBufferState = QLatin1String("\r");
            readBuffer.chop(1);
        } else {
            endOfBufferState.clear();
        }
    }

#if defined (QTEXTSTREAM_DEBUG)
    qDebug("QTextStreamPrivate::fillReadBuffer() read %d bytes from device. readBuffer = [%s]", int(bytesRead),
           qt_prettyDebug(readBuffer.toLatin1(), readBuffer.size(), readBuffer.size()).data());
#endif
    return true;
}

bool QTextStreamPrivate::flushWriteBuffer()
{
    // no buffer next to the QString itself; this function should only
    // be called internally, for devices.
    if (string || !device)
        return false;
    if (writeBuffer.isEmpty())
        return true;

#if defined (Q_OS_WIN)
    // handle text translation and bypass the Text flag in the device.
    bool textModeEnabled = device->isTextModeEnabled();
    if (textModeEnabled) {
        device->setTextModeEnabled(false);
        writeBuffer.replace(QLatin1Char('\n'), QLatin1String("\r\n"));
    }
#endif

#ifndef QT_NO_TEXTCODEC
    if (!codec)
        codec = QTextCodec::codecForLocale();
#if defined (QTEXTSTREAM_DEBUG)
    qDebug("QTextStreamPrivate::flushWriteBuffer(), using %s codec (%s generating BOM)",
           codec->name().constData(), writeConverterState.flags & QTextCodec::IgnoreHeader ? "not" : "");
#endif

    // convert from unicode to raw data
    QByteArray data = codec->fromUnicode(writeBuffer.data(), writeBuffer.size(), &writeConverterState);
#else
    QByteArray data = writeBuffer.toLocal8Bit();
#endif
    writeBuffer.clear();

    // write raw data to the device
    qint64 bytesWritten = device->write(data);
#if defined (QTEXTSTREAM_DEBUG)
    qDebug("QTextStreamPrivate::flushWriteBuffer(), device->write(\"%s\") == %d",
           qt_prettyDebug(data.constData(), qMin(data.size(),32), data.size()).constData(), int(bytesWritten));
#endif
    if (bytesWritten <= 0)
        return false;

#if defined (Q_OS_WIN)
    // replace the text flag
    if (textModeEnabled)
        device->setTextModeEnabled(true);
#endif

    // flush the file
#ifndef QT_NO_QOBJECT
    QFile *file = qobject_cast<QFile *>(device);
    bool flushed = file && file->flush();
#else
    bool flushed = true;
#endif

#if defined (QTEXTSTREAM_DEBUG)
    qDebug("QTextStreamPrivate::flushWriteBuffer() wrote %d bytes",
           int(bytesWritten));
#endif
    return flushed && bytesWritten == qint64(data.size());
}

bool QTextStreamPrivate::scan(const QChar **ptr, int *length, int maxlen, TokenDelimiter delimiter)
{
    int totalSize = 0;
    int delimSize = 0;
    bool consumeDelimiter = false;
    bool foundToken = false;
    int startOffset = device ? readBufferOffset : stringOffset;
    QChar lastChar;

    bool canStillReadFromDevice = true;
    do {
        int endOffset;
        const QChar *chPtr;
        if (device) {
            chPtr = readBuffer.constData();
            endOffset = readBuffer.size();
        } else {
            chPtr = string->constData();
            endOffset = string->size();
        }
        chPtr += startOffset;

        for (; !foundToken && startOffset < endOffset && (!maxlen || totalSize < maxlen); ++startOffset) {
            const QChar ch = *chPtr++;
            ++totalSize;

            if (delimiter == Space && ch.isSpace()) {
                foundToken = true;
                delimSize = 1;
            } else if (delimiter == NotSpace && !ch.isSpace()) {
                foundToken = true;
                delimSize = 1;
            } else if (delimiter == EndOfLine && ch == QLatin1Char('\n')) {
                foundToken = true;
                delimSize = (lastChar == QLatin1Char('\r')) ? 2 : 1;
                consumeDelimiter = true;
            }

            lastChar = ch;
        }
    } while (!foundToken
             && (!maxlen || totalSize < maxlen)
             && (device && (canStillReadFromDevice = fillReadBuffer())));

    // if the token was not found, but we reached the end of input,
    // then we accept what we got. if we are not at the end of input,
    // we return false.
    if (!foundToken && (!maxlen || totalSize < maxlen)
        && (totalSize == 0
            || (string && stringOffset + totalSize < string->size())
            || (device && !device->atEnd() && canStillReadFromDevice))) {
#if defined (QTEXTSTREAM_DEBUG)
        qDebug("QTextStreamPrivate::scan() did not find the token.");
#endif
        return false;
    }

    // if we find a '\r' at the end of the data when reading lines,
    // don't make it part of the line.
    if (totalSize > 0 && !foundToken && delimiter == EndOfLine) {
        if (((string && stringOffset + totalSize == string->size()) || (device && device->atEnd()))
            && lastChar == QLatin1Char('\r')) {
            consumeDelimiter = true;
            ++delimSize;
        }
    }

    // set the read offset and length of the token
    if (length)
        *length = totalSize - delimSize;
    if (ptr)
        *ptr = readPtr();

    // update last token size. the callee will call consumeLastToken() when
    // done.
    lastTokenSize = totalSize;
    if (!consumeDelimiter)
        lastTokenSize -= delimSize;

#if defined (QTEXTSTREAM_DEBUG)
    qDebug("QTextStreamPrivate::scan(%p, %p, %d, %x) token length = %d, delimiter = %d",
           ptr, length, maxlen, (int)delimiter, totalSize - delimSize, delimSize);
#endif
    return true;
}

inline const QChar *QTextStreamPrivate::readPtr() const
{
    Q_ASSERT(readBufferOffset <= readBuffer.size());
    if (string)
        return string->constData() + stringOffset;
    return readBuffer.constData() + readBufferOffset;
}

inline void QTextStreamPrivate::consumeLastToken()
{
    if (lastTokenSize)
        consume(lastTokenSize);
    lastTokenSize = 0;
}

inline void QTextStreamPrivate::consume(int size)
{
#if defined (QTEXTSTREAM_DEBUG)
    qDebug("QTextStreamPrivate::consume(%d)", size);
#endif
    if (string) {
        stringOffset += size;
        if (stringOffset > string->size())
            stringOffset = string->size();
    } else {
        readBufferOffset += size;
        if (readBufferOffset >= readBuffer.size()) {
            readBufferOffset = 0;
            readBuffer.clear();
            readBufferStartDevicePos = device->pos();
#ifndef QT_NO_TEXTCODEC
            copyConverterState(&readBufferStartReadConverterState, &readConverterState);
#endif
            readBufferStartEndOfBufferState = endOfBufferState;
        }
    }
}

inline bool QTextStreamPrivate::write(const QString &data)
{
    if (string) {
        // ### What about seek()??
        string->append(data);
    } else {
        writeBuffer += data;
        if (writeBuffer.size() > QTEXTSTREAM_BUFFERSIZE)
            return flushWriteBuffer();
    }
    return true;
}

inline bool QTextStreamPrivate::getChar(QChar *ch)
{
    if ((string && stringOffset == string->size())
        || (device && readBuffer.isEmpty() && !fillReadBuffer())) {
        if (ch)
            *ch = 0;
        return false;
    }
    if (ch)
        *ch = *readPtr();
    consume(1);
    return true;
}

inline void QTextStreamPrivate::ungetChar(const QChar &ch)
{
    if (string) {
        if (stringOffset == 0)
            string->prepend(ch);
        else
            (*string)[--stringOffset] = ch;
        return;
    }

    if (readBufferOffset == 0) {
        readBuffer.prepend(ch);
        return;
    }

    readBuffer[--readBufferOffset] = ch;
}

inline bool QTextStreamPrivate::putString(const QString &s)
{
    QString tmp = s;

    // handle padding
    int padSize = fieldWidth - s.size();
    if (padSize > 0) {
        QString pad(padSize > 0 ? padSize : 0, padChar);
        if (fieldAlignment == QTextStream::AlignLeft) {
            tmp.append(QString(padSize, padChar));
        } else if (fieldAlignment == QTextStream::AlignRight) {
            tmp.prepend(QString(padSize, padChar));
        } else if (fieldAlignment == QTextStream::AlignCenter) {
            tmp.prepend(QString(padSize/2, padChar));
            tmp.append(QString(padSize - padSize/2, padChar));
        }
    }

#if defined (QTEXTSTREAM_DEBUG)
    QByteArray a = s.toUtf8();
    QByteArray b = tmp.toUtf8();
    qDebug("QTextStreamPrivate::putString(\"%s\") calls write(\"%s\")",
           qt_prettyDebug(a.constData(), a.size(), qMax(16, a.size())).constData(),
           qt_prettyDebug(b.constData(), b.size(), qMax(16, b.size())).constData());
#endif
    return write(tmp);
}

QTextStream::QTextStream()
    : d_ptr(new QTextStreamPrivate(this))
{
#if defined (QTEXTSTREAM_DEBUG)
    qDebug("QTextStream::QTextStream()");
#endif
    Q_D(QTextStream);
    d->status = Ok;
}

QTextStream::QTextStream(QIODevice *device)
    : d_ptr(new QTextStreamPrivate(this))
{
#if defined (QTEXTSTREAM_DEBUG)
    qDebug("QTextStream::QTextStream(QIODevice *device == *%p)",
           device);
#endif
    Q_D(QTextStream);
    d->device = device;
#ifndef QT_NO_QOBJECT
    d->deviceClosedNotifier.setupDevice(this, d->device);
#endif
    d->status = Ok;
}

QTextStream::QTextStream(QString *string, QIODevice::OpenMode openMode)
    : d_ptr(new QTextStreamPrivate(this))
{
#if defined (QTEXTSTREAM_DEBUG)
    qDebug("QTextStream::QTextStream(QString *string == *%p, openMode = %d)",
           string, int(openMode));
#endif
    Q_D(QTextStream);
    d->string = string;
    d->stringOpenMode = openMode;
    d->status = Ok;
}

QTextStream::QTextStream(QByteArray *array, QIODevice::OpenMode openMode)
    : d_ptr(new QTextStreamPrivate(this))
{
#if defined (QTEXTSTREAM_DEBUG)
    qDebug("QTextStream::QTextStream(QByteArray *array == *%p, openMode = %d)",
           array, int(openMode));
#endif
    Q_D(QTextStream);
    d->device = new QBuffer(array);
    d->device->open(openMode);
    d->deleteDevice = true;
#ifndef QT_NO_QOBJECT
    d->deviceClosedNotifier.setupDevice(this, d->device);
#endif
    d->status = Ok;
}

QTextStream::QTextStream(const QByteArray &array, QIODevice::OpenMode openMode)
    : d_ptr(new QTextStreamPrivate(this))
{
#if defined (QTEXTSTREAM_DEBUG)
    qDebug("QTextStream::QTextStream(const QByteArray &array == *(%p), openMode = %d)",
           &array, int(openMode));
#endif
    QBuffer *buffer = new QBuffer;
    buffer->setData(array);
    buffer->open(openMode);

    Q_D(QTextStream);
    d->device = buffer;
    d->deleteDevice = true;
#ifndef QT_NO_QOBJECT
    d->deviceClosedNotifier.setupDevice(this, d->device);
#endif
    d->status = Ok;
}

QTextStream::QTextStream(FILE *fileHandle, QIODevice::OpenMode openMode)
    : d_ptr(new QTextStreamPrivate(this))
{
#if defined (QTEXTSTREAM_DEBUG)
    qDebug("QTextStream::QTextStream(FILE *fileHandle = %p, openMode = %d)",
           fileHandle, int(openMode));
#endif
    QFile *file = new QFile;
    file->open(fileHandle, openMode);

    Q_D(QTextStream);
    d->device = file;
    d->deleteDevice = true;
#ifndef QT_NO_QOBJECT
    d->deviceClosedNotifier.setupDevice(this, d->device);
#endif
    d->status = Ok;
}

QTextStream::~QTextStream()
{
    Q_D(QTextStream);
#if defined (QTEXTSTREAM_DEBUG)
    qDebug("QTextStream::~QTextStream()");
#endif
    if (!d->writeBuffer.isEmpty())
        d->flushWriteBuffer();

    delete d;
    d_ptr = 0;
}

void QTextStream::reset()
{
    Q_D(QTextStream);

    d->realNumberPrecision = 6;
    d->integerBase = 0;
    d->fieldWidth = 0;
    d->padChar = QLatin1Char(' ');
    d->fieldAlignment = QTextStream::AlignRight;
    d->realNumberNotation = QTextStream::SmartNotation;
    d->numberFlags = 0;
}

void QTextStream::flush()
{
    Q_D(QTextStream);
    d->flushWriteBuffer();
}

bool QTextStream::seek(qint64 pos)
{
    Q_D(QTextStream);
    d->lastTokenSize = 0;

    if (d->device) {
        // Empty the write buffer
        d->flushWriteBuffer();
        if (!d->device->seek(pos))
            return false;
        d->readBuffer.clear();
        d->readBufferOffset = 0;
        d->endOfBufferState.clear();
        d->readBufferStartDevicePos = d->device->pos();
        d->readBufferStartEndOfBufferState.clear();

#ifndef QT_NO_TEXTCODEC
        // Reset the codec converter states.
        ::resetCodecConverterState(&d->readConverterState);
        ::resetCodecConverterState(&d->readBufferStartReadConverterState);
        ::resetCodecConverterState(&d->writeConverterState);
#endif
        return true;
    }

    // string
    if (d->string && pos <= d->string->size()) {
        d->stringOffset = int(pos);
        return true;
    }
    return false;
}

qint64 QTextStream::pos() const
{
    Q_D(const QTextStream);
    if (d->device) {
        // Cutoff
        if (d->readBuffer.isEmpty() && d->endOfBufferState.isEmpty())
            return d->device->pos();
        if (d->device->isSequential())
            return 0;

        // Seek the device
        if (!d->device->seek(d->readBufferStartDevicePos))
            return qint64(-1);

        // Reset the read buffer
        QTextStreamPrivate *thatd = const_cast<QTextStreamPrivate *>(d);
        thatd->readBuffer.clear();

        // Restore the codec converter state and end state to the read buffer
        // start state.
#ifndef QT_NO_TEXTCODEC
        ::copyConverterState(&thatd->readConverterState, &d->readBufferStartReadConverterState);
#endif
        thatd->endOfBufferState = d->readBufferStartEndOfBufferState;
#ifndef QT_NO_TEXTCODEC
        if (d->readBufferStartDevicePos == 0)
            thatd->autoDetectUnicode = true;
#endif

        // Rewind the device to get to the current position Ensure that
        // readBufferOffset is unaffected by fillReadBuffer()
        int oldReadBufferOffset = d->readBufferOffset;
        while (d->readBuffer.size() < oldReadBufferOffset) {
            if (!thatd->fillReadBuffer(1))
                return qint64(-1);
        }
        thatd->readBufferOffset = oldReadBufferOffset;

        // Return the device position.
        return d->device->pos();
    }

    if (d->string)
        return d->stringOffset;

    qWarning("QTextStream::pos: no device");
    return qint64(-1);
}

void QTextStream::skipWhiteSpace()
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(Q_VOID);
    d->scan(0, 0, 0, QTextStreamPrivate::NotSpace);
    d->consumeLastToken();
}

void QTextStream::setDevice(QIODevice *device)
{
    Q_D(QTextStream);
    flush();
    if (d->deleteDevice) {
#ifndef QT_NO_QOBJECT
        d->deviceClosedNotifier.disconnect();
#endif
        delete d->device;
        d->deleteDevice = false;
    }
    d->device = device;
    d->string = 0;
#ifndef QT_NO_QOBJECT
    d->deviceClosedNotifier.setupDevice(this, d->device);
#endif
}

QIODevice *QTextStream::device() const
{
    Q_D(const QTextStream);
    return d->device;
}

void QTextStream::setString(QString *string, QIODevice::OpenMode openMode)
{
    Q_D(QTextStream);
    flush();
    if (d->deleteDevice) {
#ifndef QT_NO_QOBJECT
        d->deviceClosedNotifier.disconnect();
#endif
        delete d->device;
        d->deleteDevice = false;
    }
    d->string = string;
    d->device = 0;
    d->stringOpenMode = openMode;
}

QString *QTextStream::string() const
{
    Q_D(const QTextStream);
    return d->string;
}

void QTextStream::setFieldAlignment(FieldAlignment mode)
{
    Q_D(QTextStream);
    d->fieldAlignment = mode;
}

QTextStream::FieldAlignment QTextStream::fieldAlignment() const
{
    Q_D(const QTextStream);
    return d->fieldAlignment;
}

void QTextStream::setPadChar(QChar ch)
{
    Q_D(QTextStream);
    d->padChar = ch;
}

QChar QTextStream::padChar() const
{
    Q_D(const QTextStream);
    return d->padChar;
}

void QTextStream::setFieldWidth(int width)
{
    Q_D(QTextStream);
    d->fieldWidth = width;
}

int QTextStream::fieldWidth() const
{
    Q_D(const QTextStream);
    return d->fieldWidth;
}

void QTextStream::setNumberFlags(NumberFlags flags)
{
    Q_D(QTextStream);
    d->numberFlags = flags;
}

QTextStream::NumberFlags QTextStream::numberFlags() const
{
    Q_D(const QTextStream);
    return d->numberFlags;
}

void QTextStream::setIntegerBase(int base)
{
    Q_D(QTextStream);
    d->integerBase = base;
}

int QTextStream::integerBase() const
{
    Q_D(const QTextStream);
    return d->integerBase;
}

void QTextStream::setRealNumberNotation(RealNumberNotation notation)
{
    Q_D(QTextStream);
    d->realNumberNotation = notation;
}

QTextStream::RealNumberNotation QTextStream::realNumberNotation() const
{
    Q_D(const QTextStream);
    return d->realNumberNotation;
}

void QTextStream::setRealNumberPrecision(int precision)
{
    Q_D(QTextStream);
    d->realNumberPrecision = precision;
}

int QTextStream::realNumberPrecision() const
{
    Q_D(const QTextStream);
    return d->realNumberPrecision;
}

QTextStream::Status QTextStream::status() const
{
    Q_D(const QTextStream);
    return d->status;
}

void QTextStream::resetStatus()
{
    Q_D(QTextStream);
    d->status = Ok;
}

void QTextStream::setStatus(Status status)
{
    Q_D(QTextStream);
    if (d->status == Ok)
        d->status = status;
}

bool QTextStream::atEnd() const
{
    Q_D(const QTextStream);
    CHECK_VALID_STREAM(true);

    if (d->string)
        return d->string->size() == d->stringOffset;
    return d->readBuffer.isEmpty() && d->device->atEnd();
}

QString QTextStream::readAll()
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(QString());

    const QChar *readPtr;
    int length;
    if (!d->scan(&readPtr, &length, /* maxlen = */ 0, QTextStreamPrivate::EndOfFile))
        return QString();

    QString tmp = QString(readPtr, length);
    d->consumeLastToken();
    return tmp;
}

QString QTextStream::readLine(qint64 maxlen)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(QString());

    const QChar *readPtr;
    int length;
    if (!d->scan(&readPtr, &length, int(maxlen), QTextStreamPrivate::EndOfLine))
        return QString();

    QString tmp = QString(readPtr, length);
    d->consumeLastToken();
    return tmp;
}

QString QTextStream::read(qint64 maxlen)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(QString());

    if (maxlen <= 0)
        return QString::fromLatin1("");     // empty, not null

    const QChar *readPtr;
    int length;
    if (!d->scan(&readPtr, &length, int(maxlen), QTextStreamPrivate::EndOfFile))
        return QString();

    QString tmp = QString(readPtr, length);
    d->consumeLastToken();
    return tmp;
}

QTextStreamPrivate::NumberParsingStatus QTextStreamPrivate::getNumber(qulonglong *ret)
{
    scan(0, 0, 0, NotSpace);
    consumeLastToken();

    // detect int encoding
    int base = integerBase;
    if (base == 0) {
        QChar ch;
        if (!getChar(&ch))
            return npsInvalidPrefix;
        if (ch == QLatin1Char('0')) {
            QChar ch2;
            if (!getChar(&ch2)) {
                // Result is the number 0
                *ret = 0;
                return npsOk;
            }
            ch2 = ch2.toLower();

            if (ch2 == QLatin1Char('x')) {
                base = 16;
            } else if (ch2 == QLatin1Char('b')) {
                base = 2;
            } else if (ch2.isDigit() && ch2.digitValue() >= 0 && ch2.digitValue() <= 7) {
                base = 8;
            } else {
                base = 10;
            }
            ungetChar(ch2);
        } else if (ch == QLatin1Char('-') || ch == QLatin1Char('+') || ch.isDigit()) {
            base = 10;
        } else {
            ungetChar(ch);
            return npsInvalidPrefix;
        }
        ungetChar(ch);
        // State of the stream is now the same as on entry
        // (cursor is at prefix),
        // and local variable 'base' has been set appropriately.
    }

    qulonglong val=0;
    switch (base) {
    case 2: {
        QChar pf1, pf2, dig;
        // Parse prefix '0b'
        if (!getChar(&pf1) || pf1 != QLatin1Char('0'))
            return npsInvalidPrefix;
        if (!getChar(&pf2) || pf2.toLower() != QLatin1Char('b'))
            return npsInvalidPrefix;
        // Parse digits
        int ndigits = 0;
        while (getChar(&dig)) {
            int n = dig.toLower().unicode();
            if (n == '0' || n == '1') {
                val <<= 1;
                val += n - '0';
            } else {
                ungetChar(dig);
                break;
            }
            ndigits++;
        }
        if (ndigits == 0) {
            // Unwind the prefix and abort
            ungetChar(pf2);
            ungetChar(pf1);
            return npsMissingDigit;
        }
        break;
    }
    case 8: {
        QChar pf, dig;
        // Parse prefix '0'
        if (!getChar(&pf) || pf != QLatin1Char('0'))
            return npsInvalidPrefix;
        // Parse digits
        int ndigits = 0;
        while (getChar(&dig)) {
            int n = dig.toLower().unicode();
            if (n >= '0' && n <= '7') {
                val *= 8;
                val += n - '0';
            } else {
                ungetChar(dig);
                break;
            }
            ndigits++;
        }
        if (ndigits == 0) {
            // Unwind the prefix and abort
            ungetChar(pf);
            return npsMissingDigit;
        }
        break;
    }
    case 10: {
        // Parse sign (or first digit)
        QChar sign;
        int ndigits = 0;
        if (!getChar(&sign))
            return npsMissingDigit;
        if (sign != QLatin1Char('-') && sign != QLatin1Char('+')) {
            if (!sign.isDigit()) {
                ungetChar(sign);
                return npsMissingDigit;
            }
            val += sign.digitValue();
            ndigits++;
        }
        // Parse digits
        QChar ch;
        while (getChar(&ch)) {
            if (ch.isDigit()) {
                val *= 10;
                val += ch.digitValue();
            } else {
                ungetChar(ch);
                break;
            }
            ndigits++;
        }
        if (ndigits == 0)
            return npsMissingDigit;
        if (sign == QLatin1Char('-')) {
            qlonglong ival = qlonglong(val);
            if (ival > 0)
                ival = -ival;
            val = qulonglong(ival);
        }
        break;
    }
    case 16: {
        QChar pf1, pf2, dig;
        // Parse prefix ' 0x'
        if (!getChar(&pf1) || pf1 != QLatin1Char('0'))
            return npsInvalidPrefix;
        if (!getChar(&pf2) || pf2.toLower() != QLatin1Char('x'))
            return npsInvalidPrefix;
        // Parse digits
        int ndigits = 0;
        while (getChar(&dig)) {
            int n = dig.toLower().unicode();
            if (n >= '0' && n <= '9') {
                val <<= 4;
                val += n - '0';
            } else if (n >= 'a' && n <= 'f') {
                val <<= 4;
                val += 10 + (n - 'a');
            } else {
                ungetChar(dig);
                break;
            }
            ndigits++;
        }
        if (ndigits == 0) {
            return npsMissingDigit;
        }
        break;
    }
    default:
        // Unsupported integerBase
        return npsInvalidPrefix;
    }

    if (ret)
        *ret = val;
    return npsOk;
}

bool QTextStreamPrivate::getReal(double *f)
{
    // We use a table-driven FSM to parse floating point numbers
    // strtod() cannot be used directly since we may be reading from a
    // QIODevice.
    enum ParserState {
        Init = 0,
        Sign = 1,
        Mantissa = 2,
        Dot = 3,
        Abscissa = 4,
        ExpMark = 5,
        ExpSign = 6,
        Exponent = 7,
        Done = 8
    };
    enum InputToken {
        None = 0,
        InputSign = 1,
        InputDigit = 2,
        InputDot = 3,
        InputExp = 4
    };

    static uchar table[8][5] = {
        // None InputSign InputDigit InputDot InputExp
        { 0,    Sign,     Mantissa,  Dot,     0        }, // Init
        { 0,    0,        Mantissa,  Dot,     0        }, // Sign
        { Done, Done,     Mantissa,  Dot,     ExpMark  }, // Mantissa
        { 0,    0,        Abscissa,  0,       0        }, // Dot
        { Done, Done,     Abscissa,  Done,    ExpMark  }, // Abscissa
        { 0,    ExpSign,  Exponent,  0,       0        }, // ExpMark
        { 0,    0,        Exponent,  0,       0        }, // ExpSign
        { Done, Done,     Exponent,  Done,    Done     }  // Exponent
    };

    ParserState state = Init;
    InputToken input = None;

    scan(0, 0, 0, NotSpace);
    consumeLastToken();

    const int BufferSize = 128;
    char buf[BufferSize];
    int i = 0;

    QChar c;
    while (getChar(&c)) {
        switch (c.unicode()) {
        case '+':
        case '-':
            input = InputSign;
            break;
        case '0': case '1': case '2': case '3': case '4':
        case '5': case '6': case '7': case '8': case '9':
            input = InputDigit;
            break;
        case '.':
            input = InputDot;
            break;
        case 'e':
        case 'E':
            input = InputExp;
            break;
        default:
            input = None;
            break;
        }

        state = ParserState(table[state][input]);

        if  (state == Init || state == Done || i > (BufferSize - 5)) {
            ungetChar(c);
            if (i > (BufferSize - 5)) { // ignore rest of digits
                while (getChar(&c)) {
                    if (!c.isDigit()) {
                        ungetChar(c);
                        break;
                    }
                }
            }
            break;
        }

        buf[i++] = c.toLatin1();
    }

    if (i == 0)
        return false;

    buf[i] = '\0';

    if (f)
        *f = strtod(buf, 0);
    return true;
}

QTextStream &QTextStream::operator>>(QChar &c)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->scan(0, 0, 0, QTextStreamPrivate::NotSpace);
    if (!d->getChar(&c))
        setStatus(ReadPastEnd);
    return *this;
}

QTextStream &QTextStream::operator>>(char &c)
{
    QChar ch;
    *this >> ch;
    c = ch.toLatin1();
    return *this;
}

QTextStream &QTextStream::operator>>(signed short &i)
{
    IMPLEMENT_STREAM_RIGHT_INT_OPERATOR(signed short);
}

QTextStream &QTextStream::operator>>(unsigned short &i)
{
    IMPLEMENT_STREAM_RIGHT_INT_OPERATOR(unsigned short);
}

QTextStream &QTextStream::operator>>(signed int &i)
{
    IMPLEMENT_STREAM_RIGHT_INT_OPERATOR(signed int);
}

QTextStream &QTextStream::operator>>(unsigned int &i)
{
    IMPLEMENT_STREAM_RIGHT_INT_OPERATOR(unsigned int);
}

QTextStream &QTextStream::operator>>(signed long &i)
{
    IMPLEMENT_STREAM_RIGHT_INT_OPERATOR(signed long);
}

QTextStream &QTextStream::operator>>(unsigned long &i)
{
    IMPLEMENT_STREAM_RIGHT_INT_OPERATOR(unsigned long);
}

QTextStream &QTextStream::operator>>(qlonglong &i)
{
    IMPLEMENT_STREAM_RIGHT_INT_OPERATOR(qlonglong);
}

QTextStream &QTextStream::operator>>(qulonglong &i)
{
    IMPLEMENT_STREAM_RIGHT_INT_OPERATOR(qulonglong);
}

QTextStream &QTextStream::operator>>(float &f)
{
    IMPLEMENT_STREAM_RIGHT_REAL_OPERATOR(float);
}

QTextStream &QTextStream::operator>>(double &f)
{
    IMPLEMENT_STREAM_RIGHT_REAL_OPERATOR(double);
}

QTextStream &QTextStream::operator>>(QString &str)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);

    str.clear();
    d->scan(0, 0, 0, QTextStreamPrivate::NotSpace);
    d->consumeLastToken();

    const QChar *ptr;
    int length;
    if (!d->scan(&ptr, &length, 0, QTextStreamPrivate::Space)) {
        setStatus(ReadPastEnd);
        return *this;
    }

    str = QString(ptr, length);
    d->consumeLastToken();
    return *this;
}

QTextStream &QTextStream::operator>>(QByteArray &array)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);

    array.clear();
    d->scan(0, 0, 0, QTextStreamPrivate::NotSpace);
    d->consumeLastToken();

    const QChar *ptr;
    int length;
    if (!d->scan(&ptr, &length, 0, QTextStreamPrivate::Space)) {
        setStatus(ReadPastEnd);
        return *this;
    }

    for (int i = 0; i < length; ++i)
        array += ptr[i].toLatin1();

    d->consumeLastToken();
    return *this;
}

QTextStream &QTextStream::operator>>(char *c)
{
    Q_D(QTextStream);
    *c = 0;
    CHECK_VALID_STREAM(*this);
    d->scan(0, 0, 0, QTextStreamPrivate::NotSpace);
    d->consumeLastToken();

    const QChar *ptr;
    int length;
    if (!d->scan(&ptr, &length, 0, QTextStreamPrivate::Space)) {
        setStatus(ReadPastEnd);
        return *this;
    }

    for (int i = 0; i < length; ++i)
        *c++ = ptr[i].toLatin1();
    *c = '\0';
    d->consumeLastToken();
    return *this;
}

bool QTextStreamPrivate::putNumber(qulonglong number, bool negative)
{
    QString tmp;
    if (negative)
        tmp = QLatin1Char('-');
    else if (numberFlags & QTextStream::ForceSign)
        tmp = QLatin1Char('+');

    if (numberFlags & QTextStream::ShowBase) {
        switch (integerBase) {
        case 2: tmp += QLatin1String("0b"); break;
        case 8: tmp += QLatin1String("0"); break;
        case 16: tmp += QLatin1String("0x"); break;
        default: break;
        }
    }

    tmp += QString::number(number, integerBase ? integerBase : 10);
    if (numberFlags & QTextStream::UppercaseBase)
        tmp = tmp.toUpper(); // ### in-place instead

    return putString(tmp);
}

QTextStream &QTextStream::operator<<(QBool b)
{
    return *this << bool(b);
}

QTextStream &QTextStream::operator<<(QChar c)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putString(QString(c));
    return *this;
}

QTextStream &QTextStream::operator<<(char c)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putString(QString(QChar::fromAscii(c)));
    return *this;
}

QTextStream &QTextStream::operator<<(signed short i)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putNumber((qulonglong)qAbs(qlonglong(i)), i < 0);
    return *this;
}

QTextStream &QTextStream::operator<<(unsigned short i)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putNumber((qulonglong)i, false);
    return *this;
}

QTextStream &QTextStream::operator<<(signed int i)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putNumber((qulonglong)qAbs(qlonglong(i)), i < 0);
    return *this;
}

QTextStream &QTextStream::operator<<(unsigned int i)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putNumber((qulonglong)i, false);
    return *this;
}

QTextStream &QTextStream::operator<<(signed long i)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putNumber((qulonglong)qAbs(qlonglong(i)), i < 0);
    return *this;
}

QTextStream &QTextStream::operator<<(unsigned long i)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putNumber((qulonglong)i, false);
    return *this;
}

QTextStream &QTextStream::operator<<(qlonglong i)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putNumber((qulonglong)qAbs(i), i < 0);
    return *this;
}

QTextStream &QTextStream::operator<<(qulonglong i)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putNumber(i, false);
    return *this;
}

QTextStream &QTextStream::operator<<(float f)
{
    return *this << double(f);
}

QTextStream &QTextStream::operator<<(double f)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);

    char f_char;
    char format[16];
    if (d->realNumberNotation == FixedNotation)
        f_char = 'f';
    else if (d->realNumberNotation == ScientificNotation)
        f_char = (d->numberFlags & UppercaseBase) ? 'E' : 'e';
    else
        f_char = (d->numberFlags & UppercaseBase) ? 'G' : 'g';

    // generate format string
    register char *fs = format;

    // "%.<prec>l<f_char>"
    *fs++ = '%';
    if (d->numberFlags & QTextStream::ForcePoint)
        *fs++ = '#';
    *fs++ = '.';
    int prec = d->realNumberPrecision;
    if (prec > 99)
        prec = 99;
    if (prec >= 10) {
        *fs++ = prec / 10 + '0';
        *fs++ = prec % 10 + '0';
    } else {
        *fs++ = prec + '0';
    }
    *fs++ = 'l';
    *fs++ = f_char;
    *fs = '\0';
    QString num;
    num.sprintf(format, f);                        // convert to text

    if (f > 0.0 && (d->numberFlags & ForceSign))
        num.prepend(QLatin1Char('+'));

    d->putString(num);
    return *this;
}

QTextStream &QTextStream::operator<<(const QString &string)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putString(string);
    return *this;
}

QTextStream &QTextStream::operator<<(const QByteArray &array)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putString(QString::fromAscii(array.constData(), array.length()));
    return *this;
}

QTextStream &QTextStream::operator<<(const char *string)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    d->putString(QLatin1String(string));
    return *this;
}

QTextStream &QTextStream::operator<<(const void *ptr)
{
    Q_D(QTextStream);
    CHECK_VALID_STREAM(*this);
    int oldBase = d->integerBase;
    NumberFlags oldFlags = d->numberFlags;
    d->integerBase = 16;
    d->numberFlags |= ShowBase;
    d->putNumber(reinterpret_cast<quintptr>(ptr), false);
    d->integerBase = oldBase;
    d->numberFlags = oldFlags;
    return *this;
}

QTextStream &bin(QTextStream &stream)
{
    stream.setIntegerBase(2);
    return stream;
}

QTextStream &oct(QTextStream &stream)
{
    stream.setIntegerBase(8);
    return stream;
}

QTextStream &dec(QTextStream &stream)
{
    stream.setIntegerBase(10);
    return stream;
}

QTextStream &hex(QTextStream &stream)
{
    stream.setIntegerBase(16);
    return stream;
}

QTextStream &showbase(QTextStream &stream)
{
    stream.setNumberFlags(stream.numberFlags() | QTextStream::ShowBase);
    return stream;
}

QTextStream &forcesign(QTextStream &stream)
{
    stream.setNumberFlags(stream.numberFlags() | QTextStream::ForceSign);
    return stream;
}

QTextStream &forcepoint(QTextStream &stream)
{
    stream.setNumberFlags(stream.numberFlags() | QTextStream::ForcePoint);
    return stream;
}

QTextStream &noshowbase(QTextStream &stream)
{
    stream.setNumberFlags(stream.numberFlags() &= ~QTextStream::ShowBase);
    return stream;
}

QTextStream &noforcesign(QTextStream &stream)
{
    stream.setNumberFlags(stream.numberFlags() &= ~QTextStream::ForceSign);
    return stream;
}

QTextStream &noforcepoint(QTextStream &stream)
{
    stream.setNumberFlags(stream.numberFlags() &= ~QTextStream::ForcePoint);
    return stream;
}

QTextStream &uppercasebase(QTextStream &stream)
{
    stream.setNumberFlags(stream.numberFlags() | QTextStream::UppercaseBase);
    return stream;
}

QTextStream &uppercasedigits(QTextStream &stream)
{
    stream.setNumberFlags(stream.numberFlags() | QTextStream::UppercaseDigits);
    return stream;
}

QTextStream &lowercasebase(QTextStream &stream)
{
    stream.setNumberFlags(stream.numberFlags() & ~QTextStream::UppercaseBase);
    return stream;
}

QTextStream &lowercasedigits(QTextStream &stream)
{
    stream.setNumberFlags(stream.numberFlags() & ~QTextStream::UppercaseDigits);
    return stream;
}

QTextStream &fixed(QTextStream &stream)
{
    stream.setRealNumberNotation(QTextStream::FixedNotation);
    return stream;
}

QTextStream &scientific(QTextStream &stream)
{
    stream.setRealNumberNotation(QTextStream::ScientificNotation);
    return stream;
}

QTextStream &left(QTextStream &stream)
{
    stream.setFieldAlignment(QTextStream::AlignLeft);
    return stream;
}

QTextStream &right(QTextStream &stream)
{
    stream.setFieldAlignment(QTextStream::AlignRight);
    return stream;
}

QTextStream &center(QTextStream &stream)
{
    stream.setFieldAlignment(QTextStream::AlignCenter);
    return stream;
}

QTextStream &endl(QTextStream &stream)
{
    return stream << QLatin1Char('\n') << flush;
}

QTextStream &flush(QTextStream &stream)
{
    stream.flush();
    return stream;
}

QTextStream &reset(QTextStream &stream)
{
    stream.reset();
    return stream;
}

QTextStream &ws(QTextStream &stream)
{
    stream.skipWhiteSpace();
    return stream;
}

#ifndef QT_NO_TEXTCODEC

QTextStream &bom(QTextStream &stream)
{
    stream.setGenerateByteOrderMark(true);
    return stream;
}

void QTextStream::setCodec(QTextCodec *codec)
{
    Q_D(QTextStream);
    d->codec = codec;
}

void QTextStream::setCodec(const char *codecName)
{
    Q_D(QTextStream);
    QTextCodec *codec = QTextCodec::codecForName(codecName);
    if (codec)
        d->codec = codec;
}

QTextCodec *QTextStream::codec() const
{
    Q_D(const QTextStream);
    return d->codec;
}

void QTextStream::setAutoDetectUnicode(bool enabled)
{
    Q_D(QTextStream);
    d->autoDetectUnicode = enabled;
}

bool QTextStream::autoDetectUnicode() const
{
    Q_D(const QTextStream);
    return d->autoDetectUnicode;
}

void QTextStream::setGenerateByteOrderMark(bool generate)
{
    Q_D(QTextStream);
    if (d->writeBuffer.isEmpty()) {
        if (generate)
            d->writeConverterState.flags &= ~QTextCodec::IgnoreHeader;
        else
            d->writeConverterState.flags |= QTextCodec::IgnoreHeader;
    }
}

bool QTextStream::generateByteOrderMark() const
{
    Q_D(const QTextStream);
    return (d->writeConverterState.flags & QTextCodec::IgnoreHeader) == 0;
}

#endif

#ifdef QT3_SUPPORT

int QTextStream::flagsInternal() const
{
    Q_D(const QTextStream);

    int f = 0;
    switch (d->fieldAlignment) {
    case AlignLeft: f |= left; break;
    case AlignRight: f |= right; break;
    case AlignCenter: f |= internal; break;
    default:
        break;
    }
    switch (d->integerBase) {
    case 2: f |= bin; break;
    case 8: f |= oct; break;
    case 10: f |= dec; break;
    case 16: f |= hex; break;
    default:
        break;
    }
    switch (d->realNumberNotation) {
    case FixedNotation: f |= fixed; break;
    case ScientificNotation: f |= scientific; break;
    default:
        break;
    }
    if (d->numberFlags & ShowBase)
        f |= showbase;
    if (d->numberFlags & ForcePoint)
        f |= showpoint;
    if (d->numberFlags & ForceSign)
        f |= showpos;
    if (d->numberFlags & UppercaseBase)
        f |= uppercase;
    return f;
}

int QTextStream::flagsInternal(int newFlags)
{
    int oldFlags = flagsInternal();

    if (newFlags & left)
        setFieldAlignment(AlignLeft);
    else if (newFlags & right)
        setFieldAlignment(AlignRight);
    else if (newFlags & internal)
        setFieldAlignment(AlignCenter);

    if (newFlags & bin)
        setIntegerBase(2);
    else if (newFlags & oct)
        setIntegerBase(8);
    else if (newFlags & dec)
        setIntegerBase(10);
    else if (newFlags & hex)
        setIntegerBase(16);

    if (newFlags & showbase)
        setNumberFlags(numberFlags() | ShowBase);
    if (newFlags & showpos)
        setNumberFlags(numberFlags() | ForceSign);
    if (newFlags & showpoint)
        setNumberFlags(numberFlags() | ForcePoint);
    if (newFlags & uppercase)
        setNumberFlags(numberFlags() | UppercaseBase);

    if (newFlags & fixed)
        setRealNumberNotation(FixedNotation);
    else if (newFlags & scientific)
        setRealNumberNotation(ScientificNotation);

    return oldFlags;
}

#ifndef QT_NO_TEXTCODEC

void QTextStream::setEncoding(Encoding encoding)
{
    Q_D(QTextStream);
    ::resetCodecConverterState(&d->readConverterState);
    ::resetCodecConverterState(&d->writeConverterState);

    switch (encoding) {
    case Locale:
        d->writeConverterState.flags |= QTextCodec::IgnoreHeader;
        setCodec(QTextCodec::codecForLocale());
        d->autoDetectUnicode = true;
        break;
    case Latin1:
        d->readConverterState.flags |= QTextCodec::IgnoreHeader;
        d->writeConverterState.flags |= QTextCodec::IgnoreHeader;
        setCodec(QTextCodec::codecForName("ISO-8859-1"));
        d->autoDetectUnicode = false;
        break;
    case Unicode:
        setCodec(QTextCodec::codecForName("UTF-16"));
        d->autoDetectUnicode = false;
        break;
    case RawUnicode:
        d->readConverterState.flags |= QTextCodec::IgnoreHeader;
        d->writeConverterState.flags |= QTextCodec::IgnoreHeader;
        setCodec(QTextCodec::codecForName("UTF-16"));
        d->autoDetectUnicode = false;
        break;
    case UnicodeNetworkOrder:
        d->readConverterState.flags |= QTextCodec::IgnoreHeader;
        d->writeConverterState.flags |= QTextCodec::IgnoreHeader;
        setCodec(QTextCodec::codecForName("UTF-16BE"));
        d->autoDetectUnicode = false;
        break;
    case UnicodeReverse:
        d->readConverterState.flags |= QTextCodec::IgnoreHeader;
        d->writeConverterState.flags |= QTextCodec::IgnoreHeader;
        setCodec(QTextCodec::codecForName("UTF-16LE"));
        d->autoDetectUnicode = false;
        break;
    case UnicodeUTF8:
        d->writeConverterState.flags |= QTextCodec::IgnoreHeader;
        setCodec(QTextCodec::codecForName("UTF-8"));
        d->autoDetectUnicode = true;
        break;
    }
}
#endif

#endif

#ifndef QT_NO_QOBJECT
#include "qtextstream.moc"
#endif

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