If we find a file, which short name is equal to 'Name', we try to change its short name, while preserving the long name. It helps when unpacking an archived file, which long name is equal to short name of already existing file. Otherwise we would overwrite the already existing file, even though its long name does not match the name of unpacking file.
| 83 | // existing file. Otherwise we would overwrite the already existing file, |
| 84 | // even though its long name does not match the name of unpacking file. |
| 85 | bool UpdateExistingShortName(const wchar *Name) |
| 86 | { |
| 87 | wchar LongPathName[NM]; |
| 88 | DWORD Res=GetLongPathName(Name,LongPathName,ASIZE(LongPathName)); |
| 89 | if (Res==0 || Res>=ASIZE(LongPathName)) |
| 90 | return false; |
| 91 | wchar ShortPathName[NM]; |
| 92 | Res=GetShortPathName(Name,ShortPathName,ASIZE(ShortPathName)); |
| 93 | if (Res==0 || Res>=ASIZE(ShortPathName)) |
| 94 | return false; |
| 95 | wchar *LongName=PointToName(LongPathName); |
| 96 | wchar *ShortName=PointToName(ShortPathName); |
| 97 | |
| 98 | // We continue only if file has a short name, which does not match its |
| 99 | // long name, and this short name is equal to name of file which we need |
| 100 | // to create. |
| 101 | if (*ShortName==0 || wcsicomp(LongName,ShortName)==0 || |
| 102 | wcsicomp(PointToName(Name),ShortName)!=0) |
| 103 | return false; |
| 104 | |
| 105 | // Generate the temporary new name for existing file. |
| 106 | wchar NewName[NM]; |
| 107 | *NewName=0; |
| 108 | for (int I=0;I<10000 && *NewName==0;I+=123) |
| 109 | { |
| 110 | // Here we copy the path part of file to create. We'll make the temporary |
| 111 | // file in the same folder. |
| 112 | wcsncpyz(NewName,Name,ASIZE(NewName)); |
| 113 | |
| 114 | // Here we set the random name part. |
| 115 | swprintf(PointToName(NewName),ASIZE(NewName),L"rtmp%d",I); |
| 116 | |
| 117 | // If such file is already exist, try next random name. |
| 118 | if (FileExist(NewName)) |
| 119 | *NewName=0; |
| 120 | } |
| 121 | |
| 122 | // If we could not generate the name not used by any other file, we return. |
| 123 | if (*NewName==0) |
| 124 | return false; |
| 125 | |
| 126 | // FastFind returns the name without path, but we need the fully qualified |
| 127 | // name for renaming, so we use the path from file to create and long name |
| 128 | // from existing file. |
| 129 | wchar FullName[NM]; |
| 130 | wcsncpyz(FullName,Name,ASIZE(FullName)); |
| 131 | SetName(FullName,LongName,ASIZE(FullName)); |
| 132 | |
| 133 | // Rename the existing file to randomly generated name. Normally it changes |
| 134 | // the short name too. |
| 135 | if (!MoveFile(FullName,NewName)) |
| 136 | return false; |
| 137 | |
| 138 | // Now we need to create the temporary empty file with same name as |
| 139 | // short name of our already existing file. We do it to occupy its previous |
| 140 | // short name and not allow to use it again when renaming the file back to |
| 141 | // its original long name. |
| 142 | File KeepShortFile; |
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