412 lines
18 KiB
C++
412 lines
18 KiB
C++
#ifndef QUA_ZIP_H
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#define QUA_ZIP_H
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/*
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Copyright (C) 2005-2011 Sergey A. Tachenov
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at
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your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
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General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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See COPYING file for the full LGPL text.
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Original ZIP package is copyrighted by Gilles Vollant, see
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quazip/(un)zip.h files for details, basically it's zlib license.
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**/
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#include <QString>
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#include <QStringList>
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#include <QTextCodec>
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#include "zip.h"
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#include "unzip.h"
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#include "quazip_global.h"
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#include "quazipfileinfo.h"
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// just in case it will be defined in the later versions of the ZIP/UNZIP
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#ifndef UNZ_OPENERROR
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// define additional error code
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#define UNZ_OPENERROR -1000
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#endif
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class QuaZipPrivate;
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/// ZIP archive.
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/** \class QuaZip quazip.h <quazip/quazip.h>
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* This class implements basic interface to the ZIP archive. It can be
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* used to read table contents of the ZIP archive and retreiving
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* information about the files inside it.
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*
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* You can also use this class to open files inside archive by passing
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* pointer to the instance of this class to the constructor of the
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* QuaZipFile class. But see QuaZipFile::QuaZipFile(QuaZip*, QObject*)
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* for the possible pitfalls.
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*
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* This class is indended to provide interface to the ZIP subpackage of
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* the ZIP/UNZIP package as well as to the UNZIP subpackage. But
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* currently it supports only UNZIP.
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*
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* The use of this class is simple - just create instance using
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* constructor, then set ZIP archive file name using setFile() function
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* (if you did not passed the name to the constructor), then open() and
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* then use different functions to work with it! Well, if you are
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* paranoid, you may also wish to call close before destructing the
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* instance, to check for errors on close.
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*
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* You may also use getUnzFile() and getZipFile() functions to get the
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* ZIP archive handle and use it with ZIP/UNZIP package API directly.
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*
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* This class supports localized file names inside ZIP archive, but you
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* have to set up proper codec with setCodec() function. By default,
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* locale codec will be used, which is probably ok for UNIX systems, but
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* will almost certainly fail with ZIP archives created in Windows. This
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* is because Windows ZIP programs have strange habit of using DOS
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* encoding for file names in ZIP archives. For example, ZIP archive
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* with cyrillic names created in Windows will have file names in \c
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* IBM866 encoding instead of \c WINDOWS-1251. I think that calling one
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* function is not much trouble, but for true platform independency it
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* would be nice to have some mechanism for file name encoding auto
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* detection using locale information. Does anyone know a good way to do
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* it?
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**/
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class QUAZIP_EXPORT QuaZip {
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friend class QuaZipPrivate;
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public:
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/// Useful constants.
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enum Constants {
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MAX_FILE_NAME_LENGTH=256 /**< Maximum file name length. Taken from
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\c UNZ_MAXFILENAMEINZIP constant in
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unzip.c. */
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};
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/// Open mode of the ZIP file.
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enum Mode {
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mdNotOpen, ///< ZIP file is not open. This is the initial mode.
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mdUnzip, ///< ZIP file is open for reading files inside it.
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mdCreate, ///< ZIP file was created with open() call.
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mdAppend, /**< ZIP file was opened in append mode. This refers to
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* \c APPEND_STATUS_CREATEAFTER mode in ZIP/UNZIP package
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* and means that zip is appended to some existing file
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* what is useful when that file contains
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* self-extractor code. This is obviously \em not what
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* you whant to use to add files to the existing ZIP
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* archive.
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**/
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mdAdd ///< ZIP file was opened for adding files in the archive.
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};
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/// Case sensitivity for the file names.
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/** This is what you specify when accessing files in the archive.
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* Works perfectly fine with any characters thanks to Qt's great
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* unicode support. This is different from ZIP/UNZIP API, where
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* only US-ASCII characters was supported.
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**/
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enum CaseSensitivity {
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csDefault=0, ///< Default for platform. Case sensitive for UNIX, not for Windows.
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csSensitive=1, ///< Case sensitive.
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csInsensitive=2 ///< Case insensitive.
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};
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static Qt::CaseSensitivity convertCaseSensitivity(CaseSensitivity);
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private:
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QuaZipPrivate *p;
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// not (and will not be) implemented
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QuaZip(const QuaZip& that);
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// not (and will not be) implemented
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QuaZip& operator=(const QuaZip& that);
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public:
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/// Constructs QuaZip object.
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/** Call setName() before opening constructed object. */
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QuaZip();
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/// Constructs QuaZip object associated with ZIP file \a zipName.
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QuaZip(const QString& zipName);
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/// Constructs QuaZip object associated with ZIP file represented by \a ioDevice.
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/** The IO device must be seekable, otherwise an error will occur when opening. */
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QuaZip(QIODevice *ioDevice);
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/// Destroys QuaZip object.
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/** Calls close() if necessary. */
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~QuaZip();
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/// Opens ZIP file.
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/**
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* Argument \a mode specifies open mode of the ZIP archive. See Mode
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* for details. Note that there is zipOpen2() function in the
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* ZIP/UNZIP API which accepts \a globalcomment argument, but it
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* does not use it anywhere, so this open() function does not have this
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* argument. See setComment() if you need to set global comment.
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*
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* If the ZIP file is accessed via explicitly set QIODevice, then
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* this device is opened in the necessary mode. If the device was
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* already opened by some other means, then the behaviour is defined by
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* the device implementation, but generally it is not a very good
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* idea. For example, QFile will at least issue a warning.
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*
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* \return \c true if successful, \c false otherwise.
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*
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* \note ZIP/UNZIP API open calls do not return error code - they
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* just return \c NULL indicating an error. But to make things
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* easier, quazip.h header defines additional error code \c
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* UNZ_ERROROPEN and getZipError() will return it if the open call
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* of the ZIP/UNZIP API returns \c NULL.
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*
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* Argument \a ioApi specifies IO function set for ZIP/UNZIP
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* package to use. See unzip.h, zip.h and ioapi.h for details. Note
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* that IO API for QuaZip is different from the original package.
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* The file path argument was changed to be of type \c voidpf, and
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* QuaZip passes a QIODevice pointer there. This QIODevice is either
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* set explicitly via setIoDevice() or the QuaZip(QIODevice*)
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* constructor, or it is created internally when opening the archive
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* by its file name. The default API (qioapi.cpp) just delegates
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* everything to the QIODevice API. Not only this allows to use a
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* QIODevice instead of file name, but also has a nice side effect
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* of raising the file size limit from 2G to 4G.
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*
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* In short: just forget about the \a ioApi argument and you'll be
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* fine.
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**/
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bool open(Mode mode, zlib_filefunc_def *ioApi =NULL);
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/// Closes ZIP file.
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/** Call getZipError() to determine if the close was successful. The
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* underlying QIODevice is also closed, regardless of whether it was
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* set explicitly or not. */
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void close();
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/// Sets the codec used to encode/decode file names inside archive.
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/** This is necessary to access files in the ZIP archive created
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* under Windows with non-latin characters in file names. For
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* example, file names with cyrillic letters will be in \c IBM866
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* encoding.
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**/
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void setFileNameCodec(QTextCodec *fileNameCodec);
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/// Sets the codec used to encode/decode file names inside archive.
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/** \overload
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* Equivalent to calling setFileNameCodec(QTextCodec::codecForName(codecName));
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**/
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void setFileNameCodec(const char *fileNameCodecName);
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/// Returns the codec used to encode/decode comments inside archive.
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QTextCodec* getFileNameCodec() const;
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/// Sets the codec used to encode/decode comments inside archive.
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/** This codec defaults to locale codec, which is probably ok.
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**/
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void setCommentCodec(QTextCodec *commentCodec);
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/// Sets the codec used to encode/decode comments inside archive.
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/** \overload
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* Equivalent to calling setCommentCodec(QTextCodec::codecForName(codecName));
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**/
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void setCommentCodec(const char *commentCodecName);
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/// Returns the codec used to encode/decode comments inside archive.
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QTextCodec* getCommentCodec() const;
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/// Returns the name of the ZIP file.
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/** Returns null string if no ZIP file name has been set, for
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* example when the QuaZip instance is set up to use a QIODevice
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* instead.
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* \sa setZipName(), setIoDevice(), getIoDevice()
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**/
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QString getZipName() const;
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/// Sets the name of the ZIP file.
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/** Does nothing if the ZIP file is open.
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*
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* Does not reset error code returned by getZipError().
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* \sa setIoDevice(), getIoDevice(), getZipName()
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**/
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void setZipName(const QString& zipName);
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/// Returns the device representing this ZIP file.
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/** Returns null string if no device has been set explicitly, for
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* example when opening a ZIP file by name.
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* \sa setIoDevice(), getZipName(), setZipName()
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**/
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QIODevice *getIoDevice() const;
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/// Sets the device representing the ZIP file.
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/** Does nothing if the ZIP file is open.
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*
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* Does not reset error code returned by getZipError().
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* \sa getIoDevice(), getZipName(), setZipName()
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**/
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void setIoDevice(QIODevice *ioDevice);
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/// Returns the mode in which ZIP file was opened.
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Mode getMode() const;
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/// Returns \c true if ZIP file is open, \c false otherwise.
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bool isOpen() const;
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/// Returns the error code of the last operation.
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/** Returns \c UNZ_OK if the last operation was successful.
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*
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* Error code resets to \c UNZ_OK every time you call any function
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* that accesses something inside ZIP archive, even if it is \c
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* const (like getEntriesCount()). open() and close() calls reset
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* error code too. See documentation for the specific functions for
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* details on error detection.
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**/
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int getZipError() const;
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/// Returns number of the entries in the ZIP central directory.
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/** Returns negative error code in the case of error. The same error
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* code will be returned by subsequent getZipError() call.
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**/
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int getEntriesCount() const;
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/// Returns global comment in the ZIP file.
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QString getComment() const;
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/// Sets the global comment in the ZIP file.
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/** The comment will be written to the archive on close operation.
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* QuaZip makes a distinction between a null QByteArray() comment
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* and an empty "" comment in the QuaZip::mdAdd mode.
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* A null comment is the default and it means "don't change
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* the comment". An empty comment removes the original comment.
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*
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* \sa open()
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**/
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void setComment(const QString& comment);
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/// Sets the current file to the first file in the archive.
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/** Returns \c true on success, \c false otherwise. Call
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* getZipError() to get the error code.
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**/
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bool goToFirstFile();
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/// Sets the current file to the next file in the archive.
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/** Returns \c true on success, \c false otherwise. Call
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* getZipError() to determine if there was an error.
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*
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* Should be used only in QuaZip::mdUnzip mode.
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*
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* \note If the end of file was reached, getZipError() will return
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* \c UNZ_OK instead of \c UNZ_END_OF_LIST_OF_FILE. This is to make
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* things like this easier:
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* \code
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* for(bool more=zip.goToFirstFile(); more; more=zip.goToNextFile()) {
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* // do something
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* }
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* if(zip.getZipError()==UNZ_OK) {
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* // ok, there was no error
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* }
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* \endcode
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**/
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bool goToNextFile();
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/// Sets current file by its name.
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/** Returns \c true if successful, \c false otherwise. Argument \a
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* cs specifies case sensitivity of the file name. Call
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* getZipError() in the case of a failure to get error code.
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*
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* This is not a wrapper to unzLocateFile() function. That is
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* because I had to implement locale-specific case-insensitive
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* comparison.
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*
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* Here are the differences from the original implementation:
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*
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* - If the file was not found, error code is \c UNZ_OK, not \c
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* UNZ_END_OF_LIST_OF_FILE (see also goToNextFile()).
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* - If this function fails, it unsets the current file rather than
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* resetting it back to what it was before the call.
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*
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* If \a fileName is null string then this function unsets the
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* current file and return \c true. Note that you should close the
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* file first if it is open! See
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* QuaZipFile::QuaZipFile(QuaZip*,QObject*) for the details.
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*
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* Should be used only in QuaZip::mdUnzip mode.
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*
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* \sa setFileNameCodec(), CaseSensitivity
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**/
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bool setCurrentFile(const QString& fileName, CaseSensitivity cs =csDefault);
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/// Returns \c true if the current file has been set.
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bool hasCurrentFile() const;
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/// Retrieves information about the current file.
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/** Fills the structure pointed by \a info. Returns \c true on
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* success, \c false otherwise. In the latter case structure pointed
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* by \a info remains untouched. If there was an error,
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* getZipError() returns error code.
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*
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* Should be used only in QuaZip::mdUnzip mode.
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*
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* Does nothing and returns \c false in any of the following cases.
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* - ZIP is not open;
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* - ZIP does not have current file;
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* - \a info is \c NULL;
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*
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* In all these cases getZipError() returns \c UNZ_OK since there
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* is no ZIP/UNZIP API call.
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**/
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bool getCurrentFileInfo(QuaZipFileInfo* info)const;
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/// Returns the current file name.
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/** Equivalent to calling getCurrentFileInfo() and then getting \c
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* name field of the QuaZipFileInfo structure, but faster and more
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* convenient.
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*
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* Should be used only in QuaZip::mdUnzip mode.
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**/
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QString getCurrentFileName()const;
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/// Returns \c unzFile handle.
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/** You can use this handle to directly call UNZIP part of the
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* ZIP/UNZIP package functions (see unzip.h).
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*
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* \warning When using the handle returned by this function, please
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* keep in mind that QuaZip class is unable to detect any changes
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* you make in the ZIP file state (e. g. changing current file, or
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* closing the handle). So please do not do anything with this
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* handle that is possible to do with the functions of this class.
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* Or at least return the handle in the original state before
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* calling some another function of this class (including implicit
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* destructor calls and calls from the QuaZipFile objects that refer
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* to this QuaZip instance!). So if you have changed the current
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* file in the ZIP archive - then change it back or you may
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* experience some strange behavior or even crashes.
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**/
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unzFile getUnzFile();
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/// Returns \c zipFile handle.
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/** You can use this handle to directly call ZIP part of the
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* ZIP/UNZIP package functions (see zip.h). Warnings about the
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* getUnzFile() function also apply to this function.
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**/
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zipFile getZipFile();
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/// Changes the data descriptor writing mode.
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/**
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According to the ZIP format specification, a file inside archive
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may have a data descriptor immediately following the file
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data. This is reflected by a special flag in the local file header
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and in the central directory. By default, QuaZIP sets this flag
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and writes the data descriptor unless both method and level were
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set to 0, in which case it operates in 1.0-compatible mode and
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never writes data descriptors.
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By setting this flag to false, it is possible to disable data
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descriptor writing, thus increasing compatibility with archive
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readers that don't understand this feature of the ZIP file format.
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Setting this flag affects all the QuaZipFile instances that are
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opened after this flag is set.
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The data descriptor writing mode is enabled by default.
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\param enabled If \c true, enable local descriptor writing,
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disable it otherwise.
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\sa QuaZipFile::setDataDescriptorWritingEnabled()
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*/
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void setDataDescriptorWritingEnabled(bool enabled);
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/// Returns the data descriptor default writing mode.
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/**
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\sa setDataDescriptorWritingEnabled()
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*/
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bool isDataDescriptorWritingEnabled() const;
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/// Returns a list of files inside the archive.
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/**
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\return A list of file names or an empty list if there
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was an error or if the archive is empty (call getZipError() to
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figure out which).
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\sa getFileInfoList()
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*/
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QStringList getFileNameList() const;
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/// Returns information list about all files inside the archive.
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/**
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\return A list of QuaZipFileInfo objects or an empty list if there
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was an error or if the archive is empty (call getZipError() to
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figure out which).
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\sa getFileNameList()
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*/
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QList<QuaZipFileInfo> getFileInfoList() const;
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};
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#endif
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