48 lines
2.3 KiB
Plaintext
48 lines
2.3 KiB
Plaintext
HA is an archiver which I released in january 1993 as version 0.98.
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After that I had plans to improve speed, archive handling etc. which
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would have required total rewrite of the code. For that I unfortunately
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could not find time. Because there has been quite considerably interest
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for internals of HA (especially for the HSC compression method) I
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decided to make a source level release from my current test version
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(0.999 beta) and place it under GNU General Public License. The sources
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for this version are not very consistent or clean, but everything should
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work.
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There are several improvements which should be made before this could be
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called version 1.0. Some of the most obvious of these are:
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- Compression methods should be coded in assembler for PC and using more
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efficient data structures for 32 bit platforms. Current version does
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some things only to overcome 64kB segments of 8086.
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- UNIX port has still some problems and is missing some things (for example
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a grouping operator in wildcard matches).
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- File handling is far from optimum.
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- Archive handling is not too clever either.
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- Testing should be done more thoroughly as there are many special cases
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in compression routines which get used very rarely.
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- Documentation of code and algorithms is totally missing.
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This archive (ha0999.zip) contains this readme, MSDOS executable ha.exe
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and source files for HA 0.999beta. Ha.exe is NOT compiled directly from
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included sources. Some critical parts of it were compiled from hand
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optimized versions of compiler output. It is somewhat faster than "pure
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C" version.
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MSDOS sources are for Borland C 4.0 but older versions of bcc should
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work. Makefile needs some editing as some paths are hardcoded in it.
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UNIX sources are not very generic. I have only tested this using Linux
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on PC and AIX on IBM6000. Only compiler and make utility that I have
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tested are GCC and GNU MAKE.
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Porting HA should be fairly easy as all machine specific code is in
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machine.h and machine.c under machine specific directories. Md_funcs.txt
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documents these functions. Examples can be found from pc and nix
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directories.
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Email address where I can be reached is "harri.hirvola@vaisala.infonet.com".
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My email addresses have not been very stable and I would not be very
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surprised if this one too is only valid for some months...
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Harri Hirvola
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