diff options
Diffstat (limited to 'src/corelib/io/qfile.cpp')
| -rw-r--r-- | src/corelib/io/qfile.cpp | 635 |
1 files changed, 18 insertions, 617 deletions
diff --git a/src/corelib/io/qfile.cpp b/src/corelib/io/qfile.cpp index 6640dca70b..433d4493e5 100644 --- a/src/corelib/io/qfile.cpp +++ b/src/corelib/io/qfile.cpp @@ -59,8 +59,6 @@ QT_BEGIN_NAMESPACE -static const int QFILE_WRITEBUFFER_SIZE = 16384; - static QByteArray locale_encode(const QString &f) { #if defined(Q_OS_DARWIN) @@ -86,16 +84,11 @@ QFile::EncoderFn QFilePrivate::encoder = locale_encode; QFile::DecoderFn QFilePrivate::decoder = locale_decode; QFilePrivate::QFilePrivate() - : fileEngine(0), lastWasWrite(false), - writeBuffer(QFILE_WRITEBUFFER_SIZE), error(QFile::NoError), - cachedSize(0) { } QFilePrivate::~QFilePrivate() { - delete fileEngine; - fileEngine = 0; } bool @@ -137,39 +130,6 @@ QAbstractFileEngine *QFilePrivate::engine() const return fileEngine; } -inline bool QFilePrivate::ensureFlushed() const -{ - // This function ensures that the write buffer has been flushed (const - // because certain const functions need to call it. - if (lastWasWrite) { - const_cast<QFilePrivate *>(this)->lastWasWrite = false; - if (!const_cast<QFile *>(q_func())->flush()) - return false; - } - return true; -} - -void -QFilePrivate::setError(QFile::FileError err) -{ - error = err; - errorString.clear(); -} - -void -QFilePrivate::setError(QFile::FileError err, const QString &errStr) -{ - error = err; - errorString = errStr; -} - -void -QFilePrivate::setError(QFile::FileError err, int errNum) -{ - error = err; - errorString = qt_error_string(errNum); -} - //************* QFile /*! @@ -278,98 +238,18 @@ QFilePrivate::setError(QFile::FileError err, int errNum) \sa QTextStream, QDataStream, QFileInfo, QDir, {The Qt Resource System} */ -/*! - \enum QFile::FileError - - This enum describes the errors that may be returned by the error() - function. - - \value NoError No error occurred. - \value ReadError An error occurred when reading from the file. - \value WriteError An error occurred when writing to the file. - \value FatalError A fatal error occurred. - \value ResourceError - \value OpenError The file could not be opened. - \value AbortError The operation was aborted. - \value TimeOutError A timeout occurred. - \value UnspecifiedError An unspecified error occurred. - \value RemoveError The file could not be removed. - \value RenameError The file could not be renamed. - \value PositionError The position in the file could not be changed. - \value ResizeError The file could not be resized. - \value PermissionsError The file could not be accessed. - \value CopyError The file could not be copied. - - \omitvalue ConnectError -*/ - -/*! - \enum QFile::Permission - - This enum is used by the permission() function to report the - permissions and ownership of a file. The values may be OR-ed - together to test multiple permissions and ownership values. - - \value ReadOwner The file is readable by the owner of the file. - \value WriteOwner The file is writable by the owner of the file. - \value ExeOwner The file is executable by the owner of the file. - \value ReadUser The file is readable by the user. - \value WriteUser The file is writable by the user. - \value ExeUser The file is executable by the user. - \value ReadGroup The file is readable by the group. - \value WriteGroup The file is writable by the group. - \value ExeGroup The file is executable by the group. - \value ReadOther The file is readable by anyone. - \value WriteOther The file is writable by anyone. - \value ExeOther The file is executable by anyone. - - \warning Because of differences in the platforms supported by Qt, - the semantics of ReadUser, WriteUser and ExeUser are - platform-dependent: On Unix, the rights of the owner of the file - are returned and on Windows the rights of the current user are - returned. This behavior might change in a future Qt version. - - Note that Qt does not by default check for permissions on NTFS - file systems, as this may decrease the performance of file - handling considerably. It is possible to force permission checking - on NTFS by including the following code in your source: - - \snippet doc/src/snippets/ntfsp.cpp 0 - - Permission checking is then turned on and off by incrementing and - decrementing \c qt_ntfs_permission_lookup by 1. - - \snippet doc/src/snippets/ntfsp.cpp 1 -*/ - -/*! - \enum QFile::FileHandleFlag - - This enum is used when opening a file to specify additional - options which only apply to files and not to a generic - QIODevice. - - \value AutoCloseHandle The file handle passed into open() should be - closed by close(), the default behavior is that close just flushes - the file and the application is responsible for closing the file handle. - When opening a file by name, this flag is ignored as Qt always owns the - file handle and must close it. - \value DontCloseHandle If not explicitly closed, the underlying file - handle is left open when the QFile object is destroyed. - */ - #ifdef QT_NO_QOBJECT QFile::QFile() - : QIODevice(*new QFilePrivate) + : QFileDevice(*new QFilePrivate) { } QFile::QFile(const QString &name) - : QIODevice(*new QFilePrivate) + : QFileDevice(*new QFilePrivate) { d_func()->fileName = name; } QFile::QFile(QFilePrivate &dd) - : QIODevice(dd) + : QFileDevice(dd) { } #else @@ -377,21 +257,21 @@ QFile::QFile(QFilePrivate &dd) \internal */ QFile::QFile() - : QIODevice(*new QFilePrivate, 0) + : QFileDevice(*new QFilePrivate, 0) { } /*! Constructs a new file object with the given \a parent. */ QFile::QFile(QObject *parent) - : QIODevice(*new QFilePrivate, parent) + : QFileDevice(*new QFilePrivate, parent) { } /*! Constructs a new file object to represent the file with the given \a name. */ QFile::QFile(const QString &name) - : QIODevice(*new QFilePrivate, 0) + : QFileDevice(*new QFilePrivate, 0) { Q_D(QFile); d->fileName = name; @@ -401,7 +281,7 @@ QFile::QFile(const QString &name) file with the specified \a name. */ QFile::QFile(const QString &name, QObject *parent) - : QIODevice(*new QFilePrivate, parent) + : QFileDevice(*new QFilePrivate, parent) { Q_D(QFile); d->fileName = name; @@ -410,7 +290,7 @@ QFile::QFile(const QString &name, QObject *parent) \internal */ QFile::QFile(QFilePrivate &dd, QObject *parent) - : QIODevice(dd, parent) + : QFileDevice(dd, parent) { } #endif @@ -420,7 +300,6 @@ QFile::QFile(QFilePrivate &dd, QObject *parent) */ QFile::~QFile() { - close(); } /*! @@ -962,20 +841,6 @@ QFile::copy(const QString &fileName, const QString &newName) } /*! - Returns true if the file can only be manipulated sequentially; - otherwise returns false. - - Most files support random-access, but some special files may not. - - \sa QIODevice::isSequential() -*/ -bool QFile::isSequential() const -{ - Q_D(const QFile); - return d->fileEngine && d->fileEngine->isSequential(); -} - -/*! Opens the file using OpenMode \a mode, returning true if successful; otherwise false. @@ -1149,119 +1014,11 @@ bool QFile::open(int fd, OpenMode mode, FileHandleFlags handleFlags) } /*! - Returns the file handle of the file. - - This is a small positive integer, suitable for use with C library - functions such as fdopen() and fcntl(). On systems that use file - descriptors for sockets (i.e. Unix systems, but not Windows) the handle - can be used with QSocketNotifier as well. - - If the file is not open, or there is an error, handle() returns -1. - - This function is not supported on Windows CE. - - \sa QSocketNotifier -*/ - -int -QFile::handle() const -{ - Q_D(const QFile); - if (!isOpen() || !d->fileEngine) - return -1; - - return d->fileEngine->handle(); -} - -/*! - \enum QFile::MemoryMapFlags - \since 4.4 - - This enum describes special options that may be used by the map() - function. - - \value NoOptions No options. -*/ - -/*! - \since 4.4 - Maps \a size bytes of the file into memory starting at \a offset. A file - should be open for a map to succeed but the file does not need to stay - open after the memory has been mapped. When the QFile is destroyed - or a new file is opened with this object, any maps that have not been - unmapped will automatically be unmapped. - - Any mapping options can be passed through \a flags. - - Returns a pointer to the memory or 0 if there is an error. - - \note On Windows CE 5.0 the file will be closed before mapping occurs. - - \sa unmap() - */ -uchar *QFile::map(qint64 offset, qint64 size, MemoryMapFlags flags) -{ - Q_D(QFile); - if (d->engine() - && d->fileEngine->supportsExtension(QAbstractFileEngine::MapExtension)) { - unsetError(); - uchar *address = d->fileEngine->map(offset, size, flags); - if (address == 0) - d->setError(d->fileEngine->error(), d->fileEngine->errorString()); - return address; - } - return 0; -} - -/*! - \since 4.4 - Unmaps the memory \a address. - - Returns true if the unmap succeeds; false otherwise. - - \sa map() - */ -bool QFile::unmap(uchar *address) -{ - Q_D(QFile); - if (d->engine() - && d->fileEngine->supportsExtension(QAbstractFileEngine::UnMapExtension)) { - unsetError(); - bool success = d->fileEngine->unmap(address); - if (!success) - d->setError(d->fileEngine->error(), d->fileEngine->errorString()); - return success; - } - d->setError(PermissionsError, tr("No file engine available or engine does not support UnMapExtension")); - return false; -} - -/*! - Sets the file size (in bytes) \a sz. Returns true if the file if the - resize succeeds; false otherwise. If \a sz is larger than the file - currently is the new bytes will be set to 0, if \a sz is smaller the - file is simply truncated. - - \sa size(), setFileName() + \reimp */ - -bool -QFile::resize(qint64 sz) +bool QFile::resize(qint64 sz) { - Q_D(QFile); - if (!d->ensureFlushed()) - return false; - d->engine(); - if (isOpen() && d->fileEngine->pos() > sz) - seek(sz); - if(d->fileEngine->setSize(sz)) { - unsetError(); - d->cachedSize = sz; - return true; - } - d->cachedSize = 0; - d->setError(QFile::ResizeError, d->fileEngine->errorString()); - return false; + return QFileDevice::resize(sz); // for now } /*! @@ -1282,18 +1039,11 @@ QFile::resize(const QString &fileName, qint64 sz) } /*! - Returns the complete OR-ed together combination of - QFile::Permission for the file. - - \sa setPermissions(), setFileName() + \reimp */ - -QFile::Permissions -QFile::permissions() const +QFile::Permissions QFile::permissions() const { - Q_D(const QFile); - QAbstractFileEngine::FileFlags perms = d->engine()->fileFlags(QAbstractFileEngine::PermsMask) & QAbstractFileEngine::PermsMask; - return QFile::Permissions((int)perms); //ewww + return QFileDevice::permissions(); // for now } /*! @@ -1317,16 +1067,9 @@ QFile::permissions(const QString &fileName) \sa permissions(), setFileName() */ -bool -QFile::setPermissions(Permissions permissions) +bool QFile::setPermissions(Permissions permissions) { - Q_D(QFile); - if (d->engine()->setPermissions(permissions)) { - unsetError(); - return true; - } - d->setError(QFile::PermissionsError, d->fileEngine->errorString()); - return false; + return QFileDevice::setPermissions(permissions); // for now } /*! @@ -1341,354 +1084,12 @@ QFile::setPermissions(const QString &fileName, Permissions permissions) return QFile(fileName).setPermissions(permissions); } -static inline qint64 _qfile_writeData(QAbstractFileEngine *engine, QRingBuffer *buffer) -{ - qint64 ret = engine->write(buffer->readPointer(), buffer->nextDataBlockSize()); - if (ret > 0) - buffer->free(ret); - return ret; -} - -/*! - Flushes any buffered data to the file. Returns true if successful; - otherwise returns false. -*/ - -bool -QFile::flush() -{ - Q_D(QFile); - if (!d->fileEngine) { - qWarning("QFile::flush: No file engine. Is IODevice open?"); - return false; - } - - if (!d->writeBuffer.isEmpty()) { - qint64 size = d->writeBuffer.size(); - if (_qfile_writeData(d->fileEngine, &d->writeBuffer) != size) { - QFile::FileError err = d->fileEngine->error(); - if(err == QFile::UnspecifiedError) - err = QFile::WriteError; - d->setError(err, d->fileEngine->errorString()); - return false; - } - } - - if (!d->fileEngine->flush()) { - QFile::FileError err = d->fileEngine->error(); - if(err == QFile::UnspecifiedError) - err = QFile::WriteError; - d->setError(err, d->fileEngine->errorString()); - return false; - } - return true; -} - -/*! - Calls QFile::flush() and closes the file. Errors from flush are ignored. - - \sa QIODevice::close() -*/ -void -QFile::close() -{ - Q_D(QFile); - if(!isOpen()) - return; - bool flushed = flush(); - QIODevice::close(); - - // reset write buffer - d->lastWasWrite = false; - d->writeBuffer.clear(); - - // keep earlier error from flush - if (d->fileEngine->close() && flushed) - unsetError(); - else if (flushed) - d->setError(d->fileEngine->error(), d->fileEngine->errorString()); -} - -/*! - Returns the size of the file. - - For regular empty files on Unix (e.g. those in \c /proc), this function - returns 0; the contents of such a file are generated on demand in response - to you calling read(). -*/ - -qint64 QFile::size() const -{ - Q_D(const QFile); - if (!d->ensureFlushed()) - return 0; - d->cachedSize = d->engine()->size(); - return d->cachedSize; -} - -/*! - \reimp -*/ - -qint64 QFile::pos() const -{ - return QIODevice::pos(); -} - -/*! - Returns true if the end of the file has been reached; otherwise returns - false. - - For regular empty files on Unix (e.g. those in \c /proc), this function - returns true, since the file system reports that the size of such a file is - 0. Therefore, you should not depend on atEnd() when reading data from such a - file, but rather call read() until no more data can be read. -*/ - -bool QFile::atEnd() const -{ - Q_D(const QFile); - - // If there's buffered data left, we're not at the end. - if (!d->buffer.isEmpty()) - return false; - - if (!isOpen()) - return true; - - if (!d->ensureFlushed()) - return false; - - // If the file engine knows best, say what it says. - if (d->fileEngine->supportsExtension(QAbstractFileEngine::AtEndExtension)) { - // Check if the file engine supports AtEndExtension, and if it does, - // check if the file engine claims to be at the end. - return d->fileEngine->atEnd(); - } - - // if it looks like we are at the end, or if size is not cached, - // fall through to bytesAvailable() to make sure. - if (pos() < d->cachedSize) - return false; - - // Fall back to checking how much is available (will stat files). - return bytesAvailable() == 0; -} - -/*! - \fn bool QFile::seek(qint64 pos) - - For random-access devices, this function sets the current position - to \a pos, returning true on success, or false if an error occurred. - For sequential devices, the default behavior is to do nothing and - return false. - - Seeking beyond the end of a file: - If the position is beyond the end of a file, then seek() shall not - immediately extend the file. If a write is performed at this position, - then the file shall be extended. The content of the file between the - previous end of file and the newly written data is UNDEFINED and - varies between platforms and file systems. -*/ - -bool QFile::seek(qint64 off) -{ - Q_D(QFile); - if (!isOpen()) { - qWarning("QFile::seek: IODevice is not open"); - return false; - } - - if (!d->ensureFlushed()) - return false; - - if (!d->fileEngine->seek(off) || !QIODevice::seek(off)) { - QFile::FileError err = d->fileEngine->error(); - if(err == QFile::UnspecifiedError) - err = QFile::PositionError; - d->setError(err, d->fileEngine->errorString()); - return false; - } - unsetError(); - return true; -} - -/*! - \reimp -*/ -qint64 QFile::readLineData(char *data, qint64 maxlen) -{ - Q_D(QFile); - if (!d->ensureFlushed()) - return -1; - - qint64 read; - if (d->fileEngine->supportsExtension(QAbstractFileEngine::FastReadLineExtension)) { - read = d->fileEngine->readLine(data, maxlen); - } else { - // Fall back to QIODevice's readLine implementation if the engine - // cannot do it faster. - read = QIODevice::readLineData(data, maxlen); - } - - if (read < maxlen) { - // failed to read all requested, may be at the end of file, stop caching size so that it's rechecked - d->cachedSize = 0; - } - - return read; -} - -/*! - \reimp -*/ - -qint64 QFile::readData(char *data, qint64 len) -{ - Q_D(QFile); - unsetError(); - if (!d->ensureFlushed()) - return -1; - - qint64 read = d->fileEngine->read(data, len); - if(read < 0) { - QFile::FileError err = d->fileEngine->error(); - if(err == QFile::UnspecifiedError) - err = QFile::ReadError; - d->setError(err, d->fileEngine->errorString()); - } - - if (read < len) { - // failed to read all requested, may be at the end of file, stop caching size so that it's rechecked - d->cachedSize = 0; - } - - return read; -} - -/*! - \internal -*/ -bool QFilePrivate::putCharHelper(char c) -{ -#ifdef QT_NO_QOBJECT - return QIODevicePrivate::putCharHelper(c); -#else - - // Cutoff for code that doesn't only touch the buffer. - int writeBufferSize = writeBuffer.size(); - if ((openMode & QIODevice::Unbuffered) || writeBufferSize + 1 >= QFILE_WRITEBUFFER_SIZE -#ifdef Q_OS_WIN - || ((openMode & QIODevice::Text) && c == '\n' && writeBufferSize + 2 >= QFILE_WRITEBUFFER_SIZE) -#endif - ) { - return QIODevicePrivate::putCharHelper(c); - } - - if (!(openMode & QIODevice::WriteOnly)) { - if (openMode == QIODevice::NotOpen) - qWarning("QIODevice::putChar: Closed device"); - else - qWarning("QIODevice::putChar: ReadOnly device"); - return false; - } - - // Make sure the device is positioned correctly. - const bool sequential = isSequential(); - if (pos != devicePos && !sequential && !q_func()->seek(pos)) - return false; - - lastWasWrite = true; - - int len = 1; -#ifdef Q_OS_WIN - if ((openMode & QIODevice::Text) && c == '\n') { - ++len; - *writeBuffer.reserve(1) = '\r'; - } -#endif - - // Write to buffer. - *writeBuffer.reserve(1) = c; - - if (!sequential) { - pos += len; - devicePos += len; - if (!buffer.isEmpty()) - buffer.skip(len); - } - - return true; -#endif -} - /*! \reimp */ - -qint64 -QFile::writeData(const char *data, qint64 len) -{ - Q_D(QFile); - unsetError(); - d->lastWasWrite = true; - bool buffered = !(d->openMode & Unbuffered); - - // Flush buffered data if this read will overflow. - if (buffered && (d->writeBuffer.size() + len) > QFILE_WRITEBUFFER_SIZE) { - if (!flush()) - return -1; - } - - // Write directly to the engine if the block size is larger than - // the write buffer size. - if (!buffered || len > QFILE_WRITEBUFFER_SIZE) { - qint64 ret = d->fileEngine->write(data, len); - if(ret < 0) { - QFile::FileError err = d->fileEngine->error(); - if(err == QFile::UnspecifiedError) - err = QFile::WriteError; - d->setError(err, d->fileEngine->errorString()); - } - return ret; - } - - // Write to the buffer. - char *writePointer = d->writeBuffer.reserve(len); - if (len == 1) - *writePointer = *data; - else - ::memcpy(writePointer, data, len); - return len; -} - -/*! - Returns the file error status. - - The I/O device status returns an error code. For example, if open() - returns false, or a read/write operation returns -1, this function can - be called to find out the reason why the operation failed. - - \sa unsetError() -*/ - -QFile::FileError -QFile::error() const -{ - Q_D(const QFile); - return d->error; -} - -/*! - Sets the file's error to QFile::NoError. - - \sa error() -*/ -void -QFile::unsetError() +qint64 QFile::size() const { - Q_D(QFile); - d->setError(QFile::NoError); + return QFileDevice::size(); // for now } QT_END_NAMESPACE |