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pts-xcom: DOS COM encoder for the Universal ASCII message xcom.com converts a DOS COM executable file to an equivalent, self-decoding COM file, with only ASCII bytes (codes 32..126) and CRLF (code 13, then 10). If you speak Hungarian, see the description in xcom_hu.txt . An explanation of how it could be done: https://codegolf.stackexchange.com/a/155023/4483 Limitation: any changes of line breaks (e.g. from CRLF to LF) will break the ASCII output of xcom.com. Unfortunately mail software and text editors often do such changes. A similar project with the same limitation: com4mail by Krasilnikov in 1993. Executable com4mail.com is available from http://nozdr.ru/marinais/ : http://nozdr.ru/marinais/texts/zip/com4mail.zip A similar project which produces DOS EXE executables with only ASCII bytes: https://www.cs.cmu.edu/~tom7/abc/paper.pdf . It also contains an explanation of how it can be done. A similar project which creates ASCII-only i386 machine code: http://www.dmi.unipg.it/bista/didattica/sicurezza-pg/buffer-overrun/hacking-book/0x2a0-writing_shellcode.html __END__
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