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This is not encryption. It just reorders the bytes.

To undo the encryption operation, run each 4-byte chunk of data through the same function you already have.

int main(void)
{
...

Hi,

A 'sed' solution:

sed -n '/^---/ { x ; /^---/ { s/^\n// ; s/\n\+/ , /g ; p } } ; /^---/! { s/ *$// ; H }' infile
Regards,
Birei

I can't reproduce this. I get:
$ mawk 'END{print _}/^-/{if(_)print _;_=$0;next}{_=_";"$0}' infile
-------;2010-10-18;10:55:50;AV;0594 ;F0594;Windows NT Versi¢n 4.0 ;lun 18/10/2010 ;10.55...

This works for me:


awk '
function p()
{
if( buffer )
print "---" buffer; # print if it existed; dont print for last seperator
...

awk 'END{print _}/^-/{if(_)print _;_=$0;next}{_=_" , "$0}' infile