mirror of
https://github.com/RetroShare/RetroShare.git
synced 2024-12-21 05:44:29 -05:00
87344de7d4
git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@1850 b45a01b8-16f6-495d-af2f-9b41ad6348cc
443 lines
19 KiB
C++
443 lines
19 KiB
C++
#ifndef QUA_ZIPFILE_H
|
|
#define QUA_ZIPFILE_H
|
|
|
|
/*
|
|
-- A kind of "standard" GPL license statement --
|
|
QuaZIP - a Qt/C++ wrapper for the ZIP/UNZIP package
|
|
Copyright (C) 2005-2008 Sergey A. Tachenov
|
|
|
|
This program is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU 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 General
|
|
Public License for more details.
|
|
|
|
You should have received a copy of the GNU 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
|
|
|
|
-- A kind of "standard" GPL license statement ends here --
|
|
|
|
See COPYING file for GPL.
|
|
|
|
You are also permitted to use QuaZIP under the terms of LGPL (see
|
|
COPYING.LGPL). You are free to choose either license, but please note
|
|
that QuaZIP makes use of Qt, which is not licensed under LGPL. So if
|
|
you are using Open Source edition of Qt, you therefore MUST use GPL for
|
|
your code based on QuaZIP, since it would be also based on Qt in this
|
|
case. If you are Qt commercial license owner, then you are free to use
|
|
QuaZIP as long as you respect either GPL or LGPL for QuaZIP code.
|
|
**/
|
|
|
|
#include <QIODevice>
|
|
|
|
#include "quazip.h"
|
|
#include "quazipnewinfo.h"
|
|
|
|
/// 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.
|
|
*
|
|
* \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 prohibitely 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 QuaZipFile: public QIODevice {
|
|
Q_OBJECT
|
|
private:
|
|
QuaZip *zip;
|
|
QString fileName;
|
|
QuaZip::CaseSensitivity caseSensitivity;
|
|
bool raw;
|
|
qint64 writePos;
|
|
// these two are for writing raw files
|
|
ulong uncompressedSize;
|
|
quint32 crc;
|
|
bool internal;
|
|
int zipError;
|
|
// these are not supported nor implemented
|
|
QuaZipFile(const QuaZipFile& that);
|
|
QuaZipFile& operator=(const QuaZipFile& that);
|
|
void resetZipError()const {setZipError(UNZ_OK);}
|
|
// const, but sets zipError!
|
|
void setZipError(int zipError)const;
|
|
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 {return fileName;}
|
|
/// 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 {return caseSensitivity;}
|
|
/// 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 {return raw;}
|
|
/// 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).
|
|
**/
|
|
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 {return zipError;}
|
|
};
|
|
|
|
#endif
|