far2l/src/fileowner.hpp

   1 #pragma once
   2
   3 /*
   4 fileowner.hpp
   5
   6 Кэш SID`ов и функция GetOwner
   7 */
   8 /*
   9 Copyright (c) 1996 Eugene Roshal
  10 Copyright (c) 2000 Far Group
  11 All rights reserved.
  12
  13 Redistribution and use in source and binary forms, with or without
  14 modification, are permitted provided that the following conditions
  15 are met:
  16 1. Redistributions of source code must retain the above copyright
  17    notice, this list of conditions and the following disclaimer.
  18 2. Redistributions in binary form must reproduce the above copyright
  19    notice, this list of conditions and the following disclaimer in the
  20    documentation and/or other materials provided with the distribution.
  21 3. The name of the authors may not be used to endorse or promote products
  22    derived from this software without specific prior written permission.
  23
  24 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  25 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  26 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  27 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  28 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  29 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  30 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  31 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  32 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  33 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34 */
  35
  36 #include <map>
  37
  38 template <class ID, const char *(*UNCACHED_LOOKUP)(ID)>
  39 class CachedFileLookupT
  40 {
  41         struct Cache : std::map<ID, FARString>
  42         {
  43         } _cache;
  44
  45 public:
  46         const FARString &Lookup(ID id)
  47         {
  48                 auto cache_it = _cache.lower_bound(id);
  49                 if (cache_it == _cache.end() || cache_it->first != id) {
  50                         const char *uncached_value = UNCACHED_LOOKUP(id);
  51                         if (!uncached_value) {
  52                                 uncached_value = "";
  53                         }
  54                         cache_it = _cache.insert(cache_it, std::make_pair(id, FARString(uncached_value)));
  55                 }
  56
  57                 return cache_it->second;
  58         }
  59 };
  60
  61 const char *OwnerNameByID(uid_t id);
  62 const char *GroupNameByID(gid_t id);
  63
  64 typedef CachedFileLookupT<uid_t, &OwnerNameByID> CachedFileOwnerLookup;
  65 typedef CachedFileLookupT<gid_t, &GroupNameByID> CachedFileGroupLookup;
  66
  67 bool WINAPI GetFileOwner(const wchar_t *Computer, const wchar_t *Name, FARString &strOwner);
  68 bool WINAPI GetFileGroup(const wchar_t *Computer, const wchar_t *Name, FARString &strGroup);
  69
  70 bool SetOwner(LPCWSTR Object, LPCWSTR Owner);
  71 bool SetGroup(LPCWSTR Object, LPCWSTR Group);