home *** CD-ROM | disk | FTP | other *** search
- By default, PKARC 2.0 will "squash" a file if this compression
- technique would appear to be optimal for that file. While I
- personally do not think it is desirable to change this, this patch is
- presented at the request of others who disagree.
-
- However, PLEASE DO NOT distribute PKARC 2.0 if it has been patched as
- shown in this document. Not only can this create problems for
- recipients of the program that are not aware that the program has
- been patched, but it is also in strict violation of the license
- agreement in PKARC to distribute the program in modified form.
-
- PKWARE INCORPORATED RESERVES THE RIGHT TO FIND ANYONE WHO DISTRIBUTES
- PKARC IN MODIFIED FORM WITHOUT EXPRESS WRITTEN CONSENT FROM PKWARE
- INCORPORATED TO BE IN VIOLATION OF THE SOFTWARE LICENSE AGREEMENT AND
- LIABLE FOR DAMAGES.
-
- Using DEBUG, change the byte at offset F25 hex in the file PKARC.COM,
- version 2.0, dated 12-15-86. The value in the distribution copy is
- 75 hex.
-
- Changing this value will yield the results shown:
-
- Byte at F25 Program Behavior
- ------------ ----------------
-
- 75 This is the 'normal' value. Squashing will be
- performed by default, when it is optimal.
-
- 74 Reverses the meaning of the "/oc" flag. By default
- squashing will NOT be performed. Specifying "/oc"
- on the command line will ENABLE squashing when it
- is optimal.
-
- EB Permanently disables squashing. Squashing will
- never be performed, regardless if the "/oc" flag is
- specified or not.
-
- WARNING: Changing the value of this byte to any other value will cause
- unpredicatble program operation.
-
-
-
- The following example session with debug will change the value to 74.
-
- Enter
-
- debug pkarc.com<CR>
-
- where <CR> means the enter key. Debug will display a "-" prompt. Then enter
-
- ef25<CR>.
-
- Debug will display something like "xxxx:0F25 75.". The xxxx value will
- vary from computer to computer. Debug should display the number 75 as
- above. If this value is not 75, then you do not have PKARC 2.0 and
- should not continue. Enter
-
- 74<CR>
-
- followed by
-
- w<CR>
-
- and then
-
- q<CR>.
-
-
- The result should appear similar to:
-
- A>debug pkarc.com
- -ef25
- xxxx:0F25 75.74
- -w
- Writing 4430 bytes
- -q
- A>
-
-
-
- -Phil Katz 1/14/87
-