#ifndef QUA_ZIPFILE_H
#define QUA_ZIPFILE_H
/*
Copyright (C) 2005-2011 Sergey A. Tachenov
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
See COPYING file for the full LGPL text.
Original ZIP package is copyrighted by Gilles Vollant, see
quazip/(un)zip.h files for details, basically it's zlib license.
**/
#include <QIODevice>
#include "quazip_global.h"
#include "quazip.h"
#include "quazipnewinfo.h"
class QuaZipFilePrivate;
/// A file inside ZIP archive.
/** \class QuaZipFile quazipfile.h <quazip/quazipfile.h>
* This is the most interesting class. Not only it provides C++
* interface to the ZIP/UNZIP package, but also integrates it with Qt by
* subclassing QIODevice. This makes possible to access files inside ZIP
* archive using QTextStream or QDataStream, for example. Actually, this
* is the main purpose of the whole QuaZIP library.
*
* You can either use existing QuaZip instance to create instance of
* this class or pass ZIP archive file name to this class, in which case
* it will create internal QuaZip object. See constructors' descriptions
* for details. Writing is only possible with the existing instance.
*
* Note that due to the underlying library's limitation it is not
* possible to use multiple QuaZipFile instances to open several files
* in the same archive at the same time. If you need to write to
* multiple files in parallel, then you should write to temporary files
* first, then pack them all at once when you have finished writing. If
* you need to read multiple files inside the same archive in parallel,
* you should extract them all into a temporary directory first.
*
* \section quazipfile-sequential Sequential or random-access?
*
* At the first thought, QuaZipFile has fixed size, the start and the
* end and should be therefore considered random-access device. But
* there is one major obstacle to making it random-access: ZIP/UNZIP API
* does not support seek() operation and the only way to implement it is
* through reopening the file and re-reading to the required position,
* but this is prohibitively slow.
*
* Therefore, QuaZipFile is considered to be a sequential device. This
* has advantage of availability of the ungetChar() operation (QIODevice
* does not implement it properly for non-sequential devices unless they
* support seek()). Disadvantage is a somewhat strange behaviour of the
* size() and pos() functions. This should be kept in mind while using
* this class.
*
**/
class QUAZIP_EXPORT QuaZipFile: public QIODevice {
friend class QuaZipFilePrivate;
Q_OBJECT
private:
QuaZipFilePrivate *p;
// these are not supported nor implemented
QuaZipFile(const QuaZipFile& that);
QuaZipFile& operator=(const QuaZipFile& that);
protected:
/// Implementation of the QIODevice::readData().
qint64 readData(char *data, qint64 maxSize);
/// Implementation of the QIODevice::writeData().
qint64 writeData(const char *data, qint64 maxSize);
public:
/// Constructs a QuaZipFile instance.
/** You should use setZipName() and setFileName() or setZip() before
* trying to call open() on the constructed object.
**/
QuaZipFile();
/// Constructs a QuaZipFile instance.
/** \a parent argument specifies this object's parent object.
*
* You should use setZipName() and setFileName() or setZip() before
* trying to call open() on the constructed object.
**/
QuaZipFile(QObject *parent);
/// Constructs a QuaZipFile instance.
/** \a parent argument specifies this object's parent object and \a
* zipName specifies ZIP archive file name.
*
* You should use setFileName() before trying to call open() on the
* constructed object.
*
* QuaZipFile constructed by this constructor can be used for read
* only access. Use QuaZipFile(QuaZip*,QObject*) for writing.
**/
QuaZipFile(const QString& zipName, QObject *parent =NULL);
/// Constructs a QuaZipFile instance.
/** \a parent argument specifies this object's parent object, \a
* zipName specifies ZIP archive file name and \a fileName and \a cs
* specify a name of the file to open inside archive.
*
* QuaZipFile constructed by this constructor can be used for read
* only access. Use QuaZipFile(QuaZip*,QObject*) for writing.
*
* \sa QuaZip::setCurrentFile()
**/
QuaZipFile(const QString& zipName, const QString& fileName,
QuaZip::CaseSensitivity cs =QuaZip::csDefault, QObject *parent =NULL);
/// Constructs a QuaZipFile instance.
/** \a parent argument specifies this object's parent object.
*
* \a zip is the pointer to the existing QuaZip object. This
* QuaZipFile object then can be used to read current file in the
* \a zip or to write to the file inside it.
*
* \warning Using this constructor for reading current file can be
* tricky. Let's take the following example:
* \code
* QuaZip zip("archive.zip");
* zip.open(QuaZip::mdUnzip);
* zip.setCurrentFile("file-in-archive");
* QuaZipFile file(&zip);
* file.open(QIODevice::ReadOnly);
* // ok, now we can read from the file
* file.read(somewhere, some);
* zip.setCurrentFile("another-file-in-archive"); // oops...
* QuaZipFile anotherFile(&zip);
* anotherFile.open(QIODevice::ReadOnly);
* anotherFile.read(somewhere, some); // this is still ok...
* file.read(somewhere, some); // and this is NOT
* \endcode
* So, what exactly happens here? When we change current file in the
* \c zip archive, \c file that references it becomes invalid
* (actually, as far as I understand ZIP/UNZIP sources, it becomes
* closed, but QuaZipFile has no means to detect it).
*
* Summary: do not close \c zip object or change its current file as
* long as QuaZipFile is open. Even better - use another constructors
* which create internal QuaZip instances, one per object, and
* therefore do not cause unnecessary trouble. This constructor may
* be useful, though, if you already have a QuaZip instance and do
* not want to access several files at once. Good example:
* \code
* QuaZip zip("archive.zip");
* zip.open(QuaZip::mdUnzip);
* // first, we need some information about archive itself
* QByteArray comment=zip.getComment();
* // and now we are going to access files inside it
* QuaZipFile file(&zip);
* for(bool more=zip.goToFirstFile(); more; more=zip.goToNextFile()) {
* file.open(QIODevice::ReadOnly);
* // do something cool with file here
* file.close(); // do not forget to close!
* }
* zip.close();
* \endcode
**/
QuaZipFile(QuaZip *zip, QObject *parent =NULL);
/// Destroys a QuaZipFile instance.
/** Closes file if open, destructs internal QuaZip object (if it
* exists and \em is internal, of course).
**/
virtual ~QuaZipFile();
/// Returns the ZIP archive file name.
/** If this object was created by passing QuaZip pointer to the
* constructor, this function will return that QuaZip's file name
* (or null string if that object does not have file name yet).
*
* Otherwise, returns associated ZIP archive file name or null
* string if there are no name set yet.
*
* \sa setZipName() getFileName()
**/
QString getZipName()const;
/// Returns a pointer to the associated QuaZip object.
/** Returns \c NULL if there is no associated QuaZip or it is
* internal (so you will not mess with it).
**/
QuaZip* getZip()const;
/// Returns file name.
/** This function returns file name you passed to this object either
* by using
* QuaZipFile(const QString&,const QString&,QuaZip::CaseSensitivity,QObject*)
* or by calling setFileName(). Real name of the file may differ in
* case if you used case-insensitivity.
*
* Returns null string if there is no file name set yet. This is the
* case when this QuaZipFile operates on the existing QuaZip object
* (constructor QuaZipFile(QuaZip*,QObject*) or setZip() was used).
*
* \sa getActualFileName
**/
QString getFileName() const;
/// Returns case sensitivity of the file name.
/** This function returns case sensitivity argument you passed to
* this object either by using
* QuaZipFile(const QString&,const QString&,QuaZip::CaseSensitivity,QObject*)
* or by calling setFileName().
*
* Returns unpredictable value if getFileName() returns null string
* (this is the case when you did not used setFileName() or
* constructor above).
*
* \sa getFileName
**/
QuaZip::CaseSensitivity getCaseSensitivity() const;
/// Returns the actual file name in the archive.
/** This is \em not a ZIP archive file name, but a name of file inside
* archive. It is not necessary the same name that you have passed
* to the
* QuaZipFile(const QString&,const QString&,QuaZip::CaseSensitivity,QObject*),
* setFileName() or QuaZip::setCurrentFile() - this is the real file
* name inside archive, so it may differ in case if the file name
* search was case-insensitive.
*
* Equivalent to calling getCurrentFileName() on the associated
* QuaZip object. Returns null string if there is no associated
* QuaZip object or if it does not have a current file yet. And this
* is the case if you called setFileName() but did not open the
* file yet. So this is perfectly fine:
* \code
* QuaZipFile file("somezip.zip");
* file.setFileName("somefile");
* QString name=file.getName(); // name=="somefile"
* QString actual=file.getActualFileName(); // actual is null string
* file.open(QIODevice::ReadOnly);
* QString actual=file.getActualFileName(); // actual can be "SoMeFiLe" on Windows
* \endcode
*
* \sa getZipName(), getFileName(), QuaZip::CaseSensitivity
**/
QString getActualFileName()const;
/// Sets the ZIP archive file name.
/** Automatically creates internal QuaZip object and destroys
* previously created internal QuaZip object, if any.
*
* Will do nothing if this file is already open. You must close() it
* first.
**/
void setZipName(const QString& zipName);
/// Returns \c true if the file was opened in raw mode.
/** If the file is not open, the returned value is undefined.
*
* \sa open(OpenMode,int*,int*,bool,const char*)
**/
bool isRaw() const;
/// Binds to the existing QuaZip instance.
/** This function destroys internal QuaZip object, if any, and makes
* this QuaZipFile to use current file in the \a zip object for any
* further operations. See QuaZipFile(QuaZip*,QObject*) for the
* possible pitfalls.
*
* Will do nothing if the file is currently open. You must close()
* it first.
**/
void setZip(QuaZip *zip);
/// Sets the file name.
/** Will do nothing if at least one of the following conditions is
* met:
* - ZIP name has not been set yet (getZipName() returns null
* string).
* - This QuaZipFile is associated with external QuaZip. In this
* case you should call that QuaZip's setCurrentFile() function
* instead!
* - File is already open so setting the name is meaningless.
*
* \sa QuaZip::setCurrentFile
**/
void setFileName(const QString& fileName, QuaZip::CaseSensitivity cs =QuaZip::csDefault);
/// Opens a file for reading.
/** Returns \c true on success, \c false otherwise.
* Call getZipError() to get error code.
*
* \note Since ZIP/UNZIP API provides buffered reading only,
* QuaZipFile does not support unbuffered reading. So do not pass
* QIODevice::Unbuffered flag in \a mode, or open will fail.
**/
virtual bool open(OpenMode mode);
/// Opens a file for reading.
/** \overload
* Argument \a password specifies a password to decrypt the file. If
* it is NULL then this function behaves just like open(OpenMode).
**/
inline bool open(OpenMode mode, const char *password)
{return open(mode, NULL, NULL, false, password);}
/// Opens a file for reading.
/** \overload
* Argument \a password specifies a password to decrypt the file.
*
* An integers pointed by \a method and \a level will receive codes
* of the compression method and level used. See unzip.h.
*
* If raw is \c true then no decompression is performed.
*
* \a method should not be \c NULL. \a level can be \c NULL if you
* don't want to know the compression level.
**/
bool open(OpenMode mode, int *method, int *level, bool raw, const char *password =NULL);
/// Opens a file for writing.
/** \a info argument specifies information about file. It should at
* least specify a correct file name. Also, it is a good idea to
* specify correct timestamp (by default, current time will be
* used). See QuaZipNewInfo.
*
* Arguments \a password and \a crc provide necessary information
* for crypting. Note that you should specify both of them if you
* need crypting. If you do not, pass \c NULL as password, but you
* still need to specify \a crc if you are going to use raw mode
* (see below).
*
* Arguments \a method and \a level specify compression method and
* level.
*
* If \a raw is \c true, no compression is performed. In this case,
* \a crc and uncompressedSize field of the \a info are required.
*
* Arguments \a windowBits, \a memLevel, \a strategy provide zlib
* algorithms tuning. See deflateInit2() in zlib.
**/
bool open(OpenMode mode, const QuaZipNewInfo& info,
const char *password =NULL, quint32 crc =0,
int method =Z_DEFLATED, int level =Z_DEFAULT_COMPRESSION, bool raw =false,
int windowBits =-MAX_WBITS, int memLevel =DEF_MEM_LEVEL, int strategy =Z_DEFAULT_STRATEGY);
/// Returns \c true, but \ref quazipfile-sequential "beware"!
virtual bool isSequential()const;
/// Returns current position in the file.
/** Implementation of the QIODevice::pos(). When reading, this
* function is a wrapper to the ZIP/UNZIP unztell(), therefore it is
* unable to keep track of the ungetChar() calls (which is
* non-virtual and therefore is dangerous to reimplement). So if you
* are using ungetChar() feature of the QIODevice, this function
* reports incorrect value until you get back characters which you
* ungot.
*
* When writing, pos() returns number of bytes already written
* (uncompressed unless you use raw mode).
*
* \note Although
* \ref quazipfile-sequential "QuaZipFile is a sequential device"
* and therefore pos() should always return zero, it does not,
* because it would be misguiding. Keep this in mind.
*
* This function returns -1 if the file or archive is not open.
*
* Error code returned by getZipError() is not affected by this
* function call.
**/
virtual qint64 pos()const;
/// Returns \c true if the end of file was reached.
/** This function returns \c false in the case of error. This means
* that you called this function on either not open file, or a file
* in the not open archive or even on a QuaZipFile instance that
* does not even have QuaZip instance associated. Do not do that
* because there is no means to determine whether \c false is
* returned because of error or because end of file was reached.
* Well, on the other side you may interpret \c false return value
* as "there is no file open to check for end of file and there is
* no end of file therefore".
*
* When writing, this function always returns \c true (because you
* are always writing to the end of file).
*
* Error code returned by getZipError() is not affected by this
* function call.
**/
virtual bool atEnd()const;
/// Returns file size.
/** This function returns csize() if the file is open for reading in
* raw mode, usize() if it is open for reading in normal mode and
* pos() if it is open for writing.
*
* Returns -1 on error, call getZipError() to get error code.
*
* \note This function returns file size despite that
* \ref quazipfile-sequential "QuaZipFile is considered to be sequential device",
* for which size() should return bytesAvailable() instead. But its
* name would be very misguiding otherwise, so just keep in mind
* this inconsistence.
**/
virtual qint64 size()const;
/// Returns compressed file size.
/** Equivalent to calling getFileInfo() and then getting
* compressedSize field, but more convenient and faster.
*
* File must be open for reading before calling this function.
*
* Returns -1 on error, call getZipError() to get error code.
**/
qint64 csize()const;
/// Returns uncompressed file size.
/** Equivalent to calling getFileInfo() and then getting
* uncompressedSize field, but more convenient and faster. See
* getFileInfo() for a warning.
*
* File must be open for reading before calling this function.
*
* Returns -1 on error, call getZipError() to get error code.
**/
qint64 usize()const;
/// Gets information about current file.
/** This function does the same thing as calling
* QuaZip::getCurrentFileInfo() on the associated QuaZip object,
* but you can not call getCurrentFileInfo() if the associated
* QuaZip is internal (because you do not have access to it), while
* you still can call this function in that case.
*
* File must be open for reading before calling this function.
*
* Returns \c false in the case of an error.
**/
bool getFileInfo(QuaZipFileInfo *info);
/// Closes the file.
/** Call getZipError() to determine if the close was successful.
**/
virtual void close();
/// Returns the error code returned by the last ZIP/UNZIP API call.
int getZipError() const;
};
#endif