I don't understand why you're putting 8 bytes at a time on the buffer. Is it just to ensure that you have an integer multiple of 8 bytes in your out_buffer? If so,
$bufsize = length $buffer;
# Make sure it's an integer multiple of 8 by reducing by any remainder
$bufsize -= $bufsize % 8;
#you could copy substr($buffer, 0, $bufsize) if you wanted/needed to
syswrite (OUTFILE, $buffer, $bufsize);
Caution: Contents may have been coded under pressure.
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