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Mounir IDRASSI
ce20a24aa5
On Unix and macOS, the hidden volume wizard estimates the available space for non-FAT outer filesystems using statvfs(). The previous calculation used f_bsize with f_bavail, which can overstate available bytes on macOS exFAT because f_bsize may be the preferred I/O size instead of the fragment size associated with the block counts. Use f_frsize when it is reported, fall back to f_bsize, and clamp the non-FAT estimate to the actual outer VeraCrypt data size before applying the existing 80% safety heuristic. Also harden hidden volume creation in both the cross-platform VolumeCreator path and the Windows/common formatting path by rejecting sizes that would exceed the hidden host data area and overlap volume header space. Fixes #1037