DOS Utilities GPATCH.EXE
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Gammadyne Corporation offers the following DOS command line programs which you may download and use freely.
Notes
* These programs run on all versions of Windows since 95.
* You may distribute these programs as long as they are not modified or sold. If you would like to package them with a commercial program, please contact us.
* These programs do not have a graphical user interface. They are meant to run from a command line (DOS prompt), batch file, or shortcut. You should keep your command line programs in a directory on your hard drive, preferably one in the PATH. For Windows 95/98/ME, we recommend "c:windowscommand". For Windows NT4/2000/XP/2003/Vista/2008/7 we recommend "c:windowssystem32".
* These programs are checked for viruses before being uploaded. We do value our reputation!
* Please send comments on these programs here.
* All programs are written by Greg Wittmeyer.
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GPATCH.EXE will alter a block of bytes in a file.
Usage
First, specify the directory and filename of the file that is to be patched. Then, specify the /i switch, followed immediately by the 0-based index of where the data should be stored in the file. The actual data can be specified one of two ways:
* The /s switch, immediately followed by the data, inside quotes. The data is expressed literally.
* The /h switch, immediately followed by a string of hexadecimal pairs, inside quotes. Each hexadecimal pair corresponds to a single byte of data. Each pair can be separated by spaces, commas, dashes, or nothing at all.
In addition, you may optionally specify the /n switch, immediately followed by the number of bytes that is to be deleted at the specified index before the data is inserted at the index. If this switch is omitted, this defaults to the length of the data, which has the end result of overwriting a section of the file without modifying its size. If the /n value is less than the length of data, the file will grow. Likewise, if the /n value is more, the file will shrink. If /n0 is specified, the data is effectively inserted into the file at the index.
Notes
* To append the data to the file, specify the /a switch instead of /i.
* You may specify multiple /s and /h switches. The final data will be the concatenation of the data specified by each switch.
Example #1: Changing the 3rd, 4th, and 5th bytes to "abc".
c:dos>gpatch f:gkillme.txt /i2 /s"abc"
GPATCH 1.6 - File Patching Utility
Copyright (C) 2002-2009 By Greg Wittmeyer - All Rights Reserved
Replaced 3 bytes at index 2 in file "f:gkillme.txt" with "abc"
Example #2: Inserting "abc" at the beginning.
c:dos>gpatch f:gkillme.txt /i0 /n0 /h"6162 63"
GPATCH 1.6 - File Patching Utility
Copyright (C) 2002-2009 By Greg Wittmeyer - All Rights Reserved
Replaced 0 bytes at index 0 in file "f:gkillme.txt" with "abc"
Example #3: Appending "abc" to the end.
c:dos>gpatch f:gkillme.txt /a /s"abc"
GPATCH 1.6 - File Patching Utility
Copyright (C) 2002-2009 By Greg Wittmeyer - All Rights Reserved
Replaced 0 bytes at index 4 in file "f:gkillme.txt" with "abc"
Example #4: Deleteing the first 100 bytes.
c:dos>gpatch f:gkillme.txt /i0 /n100 /s""
GPATCH 1.6 - File Patching Utility
Copyright (C) 2002-2009 By Greg Wittmeyer - All Rights Reserved
Replaced 100 bytes at index 0 in file "f:gkillme.txt" with ""
Free download from Shareware Connection - GPATCH.
Version: 1.6 | Size: 256 KB | Platform: Win2000, Windows 7, WinOther, WinServer, WinVista
Released Date: | Rating: 0 | Title: DOS Utilities GPATCH.EXE
Author Url: http://www.gammadyne.com
Program Info Url: http://www.gammadyne.com
Download Url: http://www.gammadyne.com/gpatch.exe
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