nihilist/VeraCrypt
1
0
Fork 0
mirror of https://github.com/veracrypt/VeraCrypt synced 2024-12-12 12:53:30 +01:00
Code Issues Packages Projects Releases Wiki Activity

Windows: fallback to absolute positioning if relative positioning fails

Browse Source 
This can serve as workaround if a disk rejects relative positioning for
some reason.
This commit is contained in:
Mounir IDRASSI 2023-10-13 23:55:19 +02:00
parent 4cfb4b03a7
commit 5e0aec534f
No known key found for this signature in database
GPG Key ID: FC1B00364B3FE937
1 changed files with 13 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
src/Format/InPlace.c
View File

@ -2208,24 +2208,27 @@ BOOL SaveNonSysInPlaceEncSettings (int delta, WipeAlgorithmId newWipeAlgorithm,
// SetFilePointerEx() with FILE_BEGIN as the reference point, reaching the end of large drives // SetFilePointerEx() with FILE_BEGIN as the reference point, reaching the end of large drives
// during in-place encryption can cause significant slowdowns. By moving the file pointer // during in-place encryption can cause significant slowdowns. By moving the file pointer
// relatively, these performance issues are mitigated. // relatively, these performance issues are mitigated.
//
// We fall back to absolute positioning if the relative positioning fails.
BOOL MoveFilePointer (HANDLE dev, LARGE_INTEGER offset) BOOL MoveFilePointer (HANDLE dev, LARGE_INTEGER offset)
{ {
LARGE_INTEGER currOffset; LARGE_INTEGER currOffset;
LARGE_INTEGER diffOffset; LARGE_INTEGER diffOffset;
currOffset.QuadPart = 0; currOffset.QuadPart = 0;
if (SetFilePointerEx (dev, currOffset, &currOffset, FILE_CURRENT) == 0) if (SetFilePointerEx (dev, currOffset, &currOffset, FILE_CURRENT))
return FALSE; {
diffOffset.QuadPart = offset.QuadPart - currOffset.QuadPart; diffOffset.QuadPart = offset.QuadPart - currOffset.QuadPart;
if (diffOffset.QuadPart == 0) if (diffOffset.QuadPart == 0)
return TRUE; return TRUE;
// Moves the file pointer by the difference between current and desired positions // Moves the file pointer by the difference between current and desired positions
if (SetFilePointerEx (dev, diffOffset, NULL, FILE_CURRENT) == 0) if (SetFilePointerEx (dev, diffOffset, NULL, FILE_CURRENT))
return FALSE;
return TRUE; return TRUE;
}
// An error occurred, fallback to absolute positioning
return SetFilePointerEx (dev, offset, NULL, FILE_BEGIN);
} }
// Repairs damaged sectors (i.e. those with read errors) by zeroing them. // Repairs damaged sectors (i.e. those with read errors) by zeroing them.