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| -rw-r--r-- | include/comphelper/backupfilehelper.hxx | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/include/comphelper/backupfilehelper.hxx b/include/comphelper/backupfilehelper.hxx new file mode 100644 index 000000000..abf8044a2 --- /dev/null +++ b/include/comphelper/backupfilehelper.hxx @@ -0,0 +1,216 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + */ + +#ifndef INCLUDED_COMPHELPER_BACKUPFILEHELPER_HXX +#define INCLUDED_COMPHELPER_BACKUPFILEHELPER_HXX + +#include <sal/config.h> + +#include <comphelper/comphelperdllapi.h> +#include <rtl/ustring.hxx> +#include <set> +#include <string_view> +#include <vector> + +namespace comphelper +{ + /** Helper class to backup/restore a single file + * + * This is a general class to manage backups/restore of the file + * given by the URL. The container holding the backups is created + * aside the original file, e.g for 'test.txt' a container + * called '.test.pack' will be used. If it was not yet backed-up + * this container file will be created at the 1st backup and deleted + * when the last gets removed. The container holds a stack with a + * maximum given number (in the constructor) of copies, these are by + * default compressed, but don't have to be (see tryPush). + * + * Due to being on a low system level here, no UNO API and not much + * other tooling can be used, as a consequence for the container a + * own simple format is used and e.g. the zip lib directly. + * + * You need to hand over the URL of the file to look at and + * a maximum number of allowed copies. That number is internally + * limited to an absolute max of 10 (see implementation). The number + * of allowed copies is limited to [1..max]. + * + * Calling tryPush() will check if there is no backup yet or if + * there is one that the file has changed. If yes, a new copy is + * created on a kind of 'stack' of copies. The return value can + * be used to see if a backup was indeed created. + * + * Calling tryPop() will do the opposite: if a backup is available, + * delete the orig file and re-instantiate the backup. The backup + * is taken off the 'stack' of copies. The return value can be + * used to check if this was done. + * + * isPopPossible can be called to see if there is a backup available + * before calling tryPop(). + * + * The 'stack' of copies works by using the same path, filename + * and extension, but adding a '_1' -> '_(num_of_copy)' to it. + */ + class COMPHELPER_DLLPUBLIC BackupFileHelper + { + private: + // internal data + std::set< OUString > maDirs; + std::set< std::pair< OUString, OUString > > maFiles; + + sal_uInt16 mnNumBackups; + sal_uInt16 mnMode; + + bool mbActive; + bool mbExtensions; + bool mbCompress; + + // internal flag if _exit() was called already - a hint to evtl. + // not create copies of potentially not well-defined data. This + // may be used in destructors of static instances - which unfortunately + // get called on WNT but not on linux. Thus I thought about encapsulating + // in some '#ifdefs', but it's just more safe to always do it and + // allows to add a SAL_WARN when one of these destructors is called + // after _exit() + static bool mbExitWasCalled; + + // internal detector if SafeModeName dir exists + static bool mbSafeModeDirExists; + + // internal upper limit (max) of allowed backups + static sal_uInt16 mnMaxAllowedBackups; + + // path to User's configuration directory and derived strings + static OUString maInitialBaseURL; + static OUString maUserConfigBaseURL; + static OUString maUserConfigWorkURL; + static OUString maRegModName; + static OUString maExt; + + // get path to User's configuration directory (created on-demand) + static const OUString& getInitialBaseURL(); + + // the name of the SafeMode directory for temporary processing + static const OUString& getSafeModeName(); + + public: + /** Constructor to handle Backups of the given file, will internally + * detect configuration values and URL to initial registrymodifications + * and thus the User configuration directory + */ + BackupFileHelper(); + + // allow to set static global flag when app had to call _exit() + static void setExitWasCalled(); + static bool getExitWasCalled(); + + // This call initializes the state of the UserDirectory as needed, it may + // initialize to SafeMode configuration or return from it by moving files + // in that directory + static void reactOnSafeMode(bool bSafeMode); + + /** tries to create a new backup, if there is none yet, or if the + * last differs from the base file. It will then put a new version + * on the 'stack' of copies and evtl. delete the oldest backup. + * Also may cleanup older backups when NumBackups given in the + * constructor has changed. + * + * tryPushExtensionInfo is the specialized version for ExtensionInfo + */ + void tryPush(); + void tryPushExtensionInfo(); + + /** finds out if a restore is possible + * + * @return bool + * returns true if a restore to an older backup is possible + * + * isPopPossibleExtensionInfo is the specialized version for ExtensionInfo + */ + bool isPopPossible(); + bool isPopPossibleExtensionInfo() const; + + /** tries to execute a restore. Will overwrite the base file + * in that case and take one version off the 'stack' of copies. + * Also may cleanup older backups when NumBackups given in the + * constructor has changed. + * + * tryPopExtensionInfo is the specialized version for ExtensionInfo + */ + void tryPop(); + void tryPopExtensionInfo(); + + /** tries to iterate the extensions and to disable all of them + */ + static bool isTryDisableAllExtensionsPossible(); + static void tryDisableAllExtensions(); + + /** Deinstall all User Extensions (installed for User only) + */ + static bool isTryDeinstallUserExtensionsPossible(); + static void tryDeinstallUserExtensions(); + + /** Reset shared Extensions + */ + static bool isTryResetSharedExtensionsPossible(); + static void tryResetSharedExtensions(); + + /** Reset bundled Extensions + */ + static bool isTryResetBundledExtensionsPossible(); + static void tryResetBundledExtensions(); + + /// Disables OpenGL and OpenCL + static void tryDisableHWAcceleration(); + + /** resets User-Customizations like Settings and UserInterface modifications + */ + static bool isTryResetCustomizationsPossible(); + static void tryResetCustomizations(); + + /** resets the whole UserProfile + */ + static void tryResetUserProfile(); + + /** Return the profile url */ + static const OUString& getUserProfileURL(); + + /** Return the url of the backed up profile (when in safe mode) */ + static const OUString& getUserProfileWorkURL(); + + private: + // internal helper methods + static OUString getPackURL(); + static const std::vector< OUString >& getCustomizationDirNames(); + static const std::vector< OUString >& getCustomizationFileNames(); + + // file push helpers + bool tryPush_Files(const std::set< OUString >& rDirs, const std::set< std::pair< OUString, OUString > >& rFiles, std::u16string_view rSourceURL, const OUString& rTargetURL); + bool tryPush_file(std::u16string_view rSourceURL, std::u16string_view rTargetURL, std::u16string_view rName, std::u16string_view rExt); + + // file pop possibilities helper + bool isPopPossible_files(const std::set< OUString >& rDirs, const std::set< std::pair< OUString, OUString > >& rFiles, std::u16string_view rSourceURL, std::u16string_view rTargetURL); + static bool isPopPossible_file(std::u16string_view rSourceURL, std::u16string_view rTargetURL, std::u16string_view rName, std::u16string_view rExt); + + // file pop helpers + bool tryPop_files(const std::set< OUString >& rDirs, const std::set< std::pair< OUString, OUString > >& rFiles, std::u16string_view rSourceURL, const OUString& rTargetURL); + bool tryPop_file(std::u16string_view rSourceURL, std::u16string_view rTargetURL, std::u16string_view rName, std::u16string_view rExt); + + // ExtensionInfo helpers + bool tryPush_extensionInfo(std::u16string_view rTargetURL); + static bool isPopPossible_extensionInfo(std::u16string_view rTargetURL); + bool tryPop_extensionInfo(std::u16string_view rTargetURL); + + // FileDirInfo helpers + void fillDirFileInfo(); + }; +} + +#endif + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |