That scheme is inefficient and fragile. Why bother to read the entire file and calculate a hash on it, when checking the file size is a whole lot faster and for an FTP upload, is just as good?
It is fragile; imagine what would happen if the upload stalled for X+1 seconds and then resumed. If you make X large to try to avoid this, it makes the processing slower.
The permission bits scheme is better, if your system supports permission bits.
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