Warning: require_once(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/WebStart.php on line 97

Warning: require_once(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/WebStart.php on line 100

Warning: require_once(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/WebStart.php on line 103

Warning: require_once(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/Defines.php on line 187

Warning: require_once(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/WebStart.php on line 115

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require_once(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/LocalSettings.php on line 139

Warning: require_once(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/LocalSettings.php on line 144

Warning: require_once(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/LocalSettings.php on line 145

Warning: require_once(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/LocalSettings.php on line 153

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require_once(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/Setup.php on line 381

Warning: require_once(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/Setup.php on line 382

Warning: require_once(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/Setup.php on line 383

Warning: require_once(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/Setup.php on line 384

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require_once(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/languages/Language.php on line 20

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: require(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/AutoLoader.php on line 1007

Warning: Cannot modify header information - headers already sent by (output started at /usr/local/www/mediawiki/includes/WebStart.php:97) in /usr/local/www/mediawiki/includes/WebResponse.php on line 38

Warning: Cannot modify header information - headers already sent by (output started at /usr/local/www/mediawiki/includes/WebStart.php:97) in /usr/local/www/mediawiki/includes/WebResponse.php on line 38

Warning: require_once(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/json/FormatJson.php on line 12
xcom (PTS) - Just Solve the File Format Problem

xcom (PTS)

From Just Solve the File Format Problem
Jump to: navigation, search
File Format
Name Xcom (PTS)
Ontology
Extension(s) .com
Released 1996?

xcom, or pts-xcom, is a DOS utility. It converts a COM file to one whose bytes all belong to a certain set of ASCII characters, and which still has the same functionality. It was developed by Péter Szabó. Most of the documentation is in Hungarian.

For some similar utilities, see Executable envelopes#Transfer-encoded executables.

Discussion

The utility seems to be designed to be very small, at the expense of things like user-friendliness.

It has a feature to recover the original file. In fact, that's the default mode of operation.

It can also encode an arbitrary data file as printable ASCII, but the result is just raw data, not much of a file format.

The example commands below are from the documentation. Note that the xcom1.com file is just the xcom-encoded version of xcom.com.

To encode a COM file:

xcom1 - <original.com >ascii.com

To decode a COM file:

xcom1 <ascii.com >original.com

Identification

Only the version identified as 2.2 - 1996-09-10 - revised 2016-03-22 has been evaluated. Other versions are presumably different.

The first 128 bytes of an encoded COM file are always the same. The bytes can be found in the source code, or the xcom1.com file.

The first 16 bytes are ASCII "&XPZ,2P_0E[0E_,p". The signature "PSW" appears at offset 123.

Software

Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox

Warning: Cannot modify header information - headers already sent by (output started at /usr/local/www/mediawiki/includes/WebStart.php:97) in /usr/local/www/mediawiki/includes/WebResponse.php on line 38

Warning: Cannot modify header information - headers already sent by (output started at /usr/local/www/mediawiki/includes/WebStart.php:97) in /usr/local/www/mediawiki/includes/WebResponse.php on line 38

Warning: Cannot modify header information - headers already sent by (output started at /usr/local/www/mediawiki/includes/WebStart.php:97) in /usr/local/www/mediawiki/includes/WebResponse.php on line 38

Warning: Cannot modify header information - headers already sent by (output started at /usr/local/www/mediawiki/includes/WebStart.php:97) in /usr/local/www/mediawiki/includes/WebResponse.php on line 38