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GCompare / GPatch - A high quality patch system for software updates
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GCompare generates patch files for the distribution of file updates.
GPatch applies the patches.
The patch file can contain patches for any number of files.
The file format is optimized for size - the patch files are very short.
CRC error checking provides safe operations.
The programs work with any type of files.
The patch files are portable. GPatch and GCompare executables are
available for some IX platforms and Windows.
Changes since last upload:
Added the PPC versions.
GCompare: Small changes in the help text.
Some changes in the guide and in the example scripts.
Changes since previous version:
GCompare: New algorithm for very high search speed (three-dimensional
search arrays). Needs more than 128 MB of memory for one patch or more
than 256 MB for additional patches. (Works of course still with fewer
memory available.)
Changed the CRC algorithm to get a comparable result with other programs.
New algorithm for Amiga executables (reloc hunk encoding) for much better
results.
Many improvements of the coding algorithms. New file format.
GPatch: Can now replace the old file and make an optional backup.
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Why should you use GCompare?
Here you have an example with different patch programs:
Let's assume, you have a new file of your program AWeb-II.
The world is using the old versions 3.2 and 3.3, and you want to
provide an update to the new version 3.4.
What you have to do is:
Build the difference files:
scompare -oAWeb32-34.spatch AWeb-II-3.2 AWeb-II-3.4
scompare -oAWeb33-34.spatch AWeb-II-3.3 AWeb-II-3.4
This needs 1:28 minutes, and you have two files:
AWeb32-34.spatch 240960 ----rwed
AWeb33-34.spatch 193328 ----rwed
or you use
gcompare AWeb-II-3.2 AWeb-II-3.3 AWeb.gpatch
gcompare AWeb-II-3.3 AWeb-II-3.4 AWeb.gpatch
This needs 0:59 minutes, and you have one file for both patches:
AWeb.gpatch 220694 ----rwed
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Now you have to create the distribution archive. You have to add
the patcher and a script to build the new file.
For the example we leave the script out. The relevant lines of
the scripts would be:
spatch -oAWeb-II-3.4 -pAWeb32-34.spatch AWeb-II (and for the other)
spatch -oAWeb-II-3.4 -pAWeb33-34.spatch AWeb-II
copy AWeb-II-3.4 AWeb3:AWeb-II
or
gpatch AWeb3:AWeb-II AWeb.gpatch RECURSIVE DIRECT
(This line patches both versions of the program.)
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So, let's build the archive:
lha -a a awebupdateS AWeb32-34.spatch
lha -a a awebupdateS AWeb33-34.spatch
lha -a a awebupdateS spatch
or
lha -a a awebupdateG AWeb.gpatch
lha -a a awebupdateG gpatch
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The resulting file is:
awebupdateS.lha 277258 ----rwed
or
awebupdateG.lha 163593 ----rwed
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Contents of util/misc/gpatch.lha PERMSSN UID GID PACKED SIZE RATIO CRC STAMP NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic] 1926 2434 79.1% -lh5- 9147 Aug 19 2002 GPatch/bin.info
[generic] 15905 28084 56.6% -lh5- 59ca Sep 6 2002 GPatch/bin/GCompare
[generic] 13054 21448 60.9% -lh5- 13d1 Sep 6 2002 GPatch/bin/GPatch
[generic] 11393 18480 61.7% -lh5- c9f1 Nov 18 1998 GPatch/bin/old/GPatch-2.6
[generic] 6723 11112 60.5% -lh5- e6d5 May 11 1997 GPatch/bin/old/GPatch_1.4
[generic] 6610 10908 60.6% -lh5- 891b Jul 5 1997 GPatch/bin/old/GPatch_1.6
[generic] 27677 78756 35.1% -lh5- 0343 Sep 8 2002 GPatch/bin/PPC/GCompare.MOS
[generic] 27147 77804 34.9% -lh5- 1733 Sep 8 2002 GPatch/bin/PPC/GCompare.PUP
[generic] 16906 45696 37.0% -lh5- 20d4 Sep 8 2002 GPatch/bin/PPC/GCompare.WOS
[generic] 16883 44680 37.8% -lh5- 3266 Sep 8 2002 GPatch/bin/PPC/GPatch.MOS
[generic] 16355 43728 37.4% -lh5- b2f1 Sep 8 2002 GPatch/bin/PPC/GPatch.PUP
[generic] 11555 29560 39.1% -lh5- 8223 Sep 8 2002 GPatch/bin/PPC/GPatch.WOS
[generic] 2871 6125 46.9% -lh5- dcbc Sep 16 2002 GPatch/ExampleScripts.info
[generic] 833 3079 27.1% -lh5- 7ade Aug 18 2002 GPatch/ExampleScripts/CompareScript
[generic] 285 672 42.4% -lh5- 541a Dec 24 1997 GPatch/ExampleScripts/CompareScript.info
[generic] 377 724 52.1% -lh5- 5176 Sep 16 2002 GPatch/ExampleScripts/GCompareAdd
[generic] 2771 5717 48.5% -lh5- 72e6 Sep 16 2002 GPatch/ExampleScripts/GCompareAdd.info
[generic] 161 815 19.8% -lh5- 8820 Feb 28 1998 GPatch/ExampleScripts/MakePatchFile
[generic] 2826 5781 48.9% -lh5- 0fd9 Sep 16 2002 GPatch/ExampleScripts/MakePatchFile.info
[generic] 392 834 47.0% -lh5- b7bf Aug 18 2002 GPatch/ExampleScripts/UpdateMyProgram
[generic] 509 1243 40.9% -lh5- 985e Aug 18 2002 GPatch/ExampleScripts/UpdateMyProgram.info
[generic] 900 2816 32.0% -lh5- 4938 Aug 29 2002 GPatch/ExampleScripts/UpdateMyProgram.installer
[generic] 451 1176 38.4% -lh5- f38a Nov 16 1998 GPatch/ExampleScripts/UpdateMyProgram.installer.info
[generic] 5761 15788 36.5% -lh5- 3180 Sep 20 2002 GPatch/GPatch.guide
[generic] 4031 6333 63.7% -lh5- 09bf Sep 20 2002 GPatch/GPatch.guide.info
[generic] 7190 18922 38.0% -lh5- 1e8b Sep 20 2002 GPatch/GPatchD.guide
[generic] 4066 6356 64.0% -lh5- ce55 Sep 20 2002 GPatch/GPatchD.guide.info
[generic] 1636 3635 45.0% -lh5- afd9 Aug 19 2002 GPatch/GPatchHistory.guide
[generic] 4377 6355 68.9% -lh5- f4c1 Aug 26 2002 GPatch/GPatchHistory.guide.info
[generic] 260 504 51.6% -lh5- 81de Sep 9 2002 GPatch/Machines.readme
[generic] 4092 6219 65.8% -lh5- 446c Sep 20 2002 GPatch.info
[generic] 1245 3133 39.7% -lh5- 3526 Sep 20 2002 gpatch.readme
---------- ----------- ------- ------- ------ ---------- ------------ -------------
Total 32 files 217168 508917 42.7% Sep 22 2002
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