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Viewing changes to src/corelib/io/qbufferedfsfileengine.cpp

  • Committer: Bazaar Package Importer
  • Author(s): Adam Conrad
  • Date: 2005-08-24 04:09:09 UTC
  • Revision ID: james.westby@ubuntu.com-20050824040909-xmxe9jfr4a0w5671
Tags: upstream-4.0.0
Import upstream version 4.0.0

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src/corelib/io/qbufferedfsfileengine.cpp
 
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#include <qdatetime.h>
 
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#include <stdio.h>
 
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#include "qfileengine.h"
 
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#include "qbufferedfsfileengine_p.h"
 
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// Required to build with msvc.net 2002
 
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#ifndef S_ISREG
 
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#define S_ISREG(x)   (((x) & S_IFMT) == S_IFREG)
 
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#endif
 
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QBufferedFSFileEngine::QBufferedFSFileEngine()
 
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    : QFSFileEngine(*new QBufferedFSFileEnginePrivate)
 
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{
 
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}
 
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QFileEngine::Type QBufferedFSFileEngine::type() const
 
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{
 
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    return Type(BufferedFSFileEngine);
 
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}
 
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bool QBufferedFSFileEngine::open(int /* flags */)
 
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{
 
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    return false;
 
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}
 
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bool QBufferedFSFileEngine::open(int /* flags */, FILE *fh)
 
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{
 
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    Q_D(QBufferedFSFileEngine);
 
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    d->fh = fh;
 
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    d->fd = fileno(fh);
 
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    struct stat st;
 
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    if (::fstat(fileno(fh), &st) != 0)
 
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        return false;
 
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    d->sequential = !S_ISREG(st.st_mode);
 
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    return true;
 
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}
 
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bool QBufferedFSFileEngine::close()
 
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{
 
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    return true;
 
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}
 
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void QBufferedFSFileEngine::flush()
 
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{
 
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    Q_D(QBufferedFSFileEngine);
 
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#ifdef Q_OS_WIN
 
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    fpos_t pos;
 
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    int gotPos = fgetpos(d->fh, &pos);
 
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#endif
 
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    fflush(d->fh);
 
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#ifdef Q_OS_WIN
 
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    if (gotPos == 0)
 
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        fsetpos(d->fh, &pos);
 
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#endif
 
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    d->lastIOCommand = QBufferedFSFileEnginePrivate::IOFlushCommand;
 
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}
 
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qint64 QBufferedFSFileEngine::at() const
 
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{
 
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    Q_D(const QBufferedFSFileEngine);
 
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    return qint64(ftell(d->fh));
 
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}
 
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bool QBufferedFSFileEngine::seek(qint64 offset)
 
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{
 
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    Q_D(QBufferedFSFileEngine);
 
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    return fseek(d->fh, long(offset), SEEK_SET) != -1;
 
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}
 
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qint64 QBufferedFSFileEngine::read(char *data, qint64 maxlen)
 
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{
 
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    Q_D(QBufferedFSFileEngine);
 
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    if (d->lastIOCommand != QBufferedFSFileEnginePrivate::IOReadCommand) {
 
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        flush();
 
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        d->lastIOCommand = QBufferedFSFileEnginePrivate::IOReadCommand;
 
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    }
 
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    if (feof(d->fh))
 
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            return -1;
 
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    return fread(data, 1, size_t(maxlen), d->fh);
 
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}
 
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qint64 QBufferedFSFileEngine::write(const char *data, qint64 len)
 
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{
 
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    Q_D(QBufferedFSFileEngine);
 
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    if (d->lastIOCommand != QBufferedFSFileEnginePrivate::IOWriteCommand) {
 
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        flush();
 
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        d->lastIOCommand = QBufferedFSFileEnginePrivate::IOWriteCommand;
 
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    }
 
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    return fwrite(data, 1, size_t(len), d->fh);
 
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}
 
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