chrome/installer/util/delete_after_reboot_helper.h

   1 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4 //
   5 // This file declares helper methods used to schedule files for deletion
   6 // on next reboot.
   7
   8 #ifndef CHROME_INSTALLER_UTIL_DELETE_AFTER_REBOOT_HELPER_H_
   9 #define CHROME_INSTALLER_UTIL_DELETE_AFTER_REBOOT_HELPER_H_
  10
  11 #include <string>
  12 #include <vector>
  13
  14 #include <windows.h>
  15
  16 namespace base {
  17 class FilePath;
  18 }
  19
  20 // Used by the unit tests.
  21 extern const wchar_t kSessionManagerKey[];
  22 extern const wchar_t kPendingFileRenameOps[];
  23
  24 typedef std::pair<std::wstring, std::wstring> PendingMove;
  25
  26 // Attempts to schedule only the item at path for deletion.
  27 bool ScheduleFileSystemEntityForDeletion(const base::FilePath& path);
  28
  29 // Attempts to recursively schedule the directory for deletion.
  30 bool ScheduleDirectoryForDeletion(const base::FilePath& dir_name);
  31
  32 // Removes all pending moves that are registered for |directory| and all
  33 // elements contained in |directory|.
  34 bool RemoveFromMovesPendingReboot(const base::FilePath& directory);
  35
  36 // Retrieves the list of pending renames from the registry and returns a vector
  37 // containing pairs of strings that represent the operations. If the list
  38 // contains only deletes then every other element will be an empty string
  39 // as per http://msdn.microsoft.com/en-us/library/aa365240(VS.85).aspx.
  40 HRESULT GetPendingMovesValue(std::vector<PendingMove>* pending_moves);
  41
  42 // This returns true if |short_form_needle| is contained in |reg_path| where
  43 // |short_form_needle| is a file system path that has been shortened by
  44 // GetShortPathName and |reg_path| is a path stored in the
  45 // PendingFileRenameOperations key.
  46 bool MatchPendingDeletePath(const base::FilePath& short_form_needle,
  47                             const base::FilePath& reg_path);
  48
  49 // Converts the strings found in |buffer| to a list of PendingMoves that is
  50 // returned in |value|.
  51 // |buffer| points to a series of pairs of null-terminated wchar_t strings
  52 // followed by a terminating null character.
  53 // |byte_count| is the length of |buffer| in bytes.
  54 // |value| is a pointer to an empty vector of PendingMoves (string pairs).
  55 // On success, this vector contains all of the string pairs extracted from
  56 // |buffer|.
  57 // Returns S_OK on success, E_INVALIDARG if buffer does not meet the above
  58 // specification.
  59 HRESULT MultiSZBytesToStringArray(const char* buffer, size_t byte_count,
  60                                   std::vector<PendingMove>* value);
  61
  62 // The inverse of MultiSZBytesToStringArray, this function converts a list
  63 // of string pairs into a byte array format suitable for writing to the
  64 // kPendingFileRenameOps registry value. It concatenates the strings and
  65 // appends an additional terminating null character.
  66 void StringArrayToMultiSZBytes(const std::vector<PendingMove>& strings,
  67                                std::vector<char>* buffer);
  68
  69 // A helper function for the win32 GetShortPathName that more conveniently
  70 // returns a FilePath. Note that if |path| is not present on the file system
  71 // then GetShortPathName will return |path| unchanged, unlike the win32
  72 // GetShortPathName which will return an error.
  73 base::FilePath GetShortPathName(const base::FilePath& path);
  74
  75 #endif  // CHROME_INSTALLER_UTIL_DELETE_AFTER_REBOOT_HELPER_H_