UNZIP for CP/M in Z80 Assembly Language - Updated Release

[Tony Nicholson]

I've updated UNZIP for CP/M in Zilog Z80 assembler.

Recently a forum member Martin provided fixes for both
the un-shrink and un-implode methods and posted them to
the comp.os.cpm USENET newsgroup.  The bugs were causing
spurious CRC errors to be reported and a program crash
for some .ZIP files.

The updated version can only be used to unpack ZIP files
created by PKzip for MS-DOS Version 1.x.  Some of these
.ZIP files exist on various CP/M archives on the Internet
(e.g. the Walnut Creek CP/M collection).

You'll find it at

https://github.com/agn453/UNZIP-CPM-Z80

Note: The CP/M version DOES NOT support the memory-
intensive Deflate algorithm implemented by PKzip 2.04g
and Info-ZIP (the open-source version of ZIP that's used
by Unix/Linux and included with Microsoft Windows and
macOS).

Tony

[Jonathan Harston]

Tony Nicholson wrote:

The updated version can only be used to unpack ZIP files
created by PKzip for MS-DOS Version 1.x.

.... and 'stored' files created by any version of ZIP on any platform.

Well done, I've had a long-dormant project to update ZIP/UNZIP for
CP/M.

jgh

[Richard Deane]

Jgh -  what do you mean by "stored"  files? Your reply is very ambiguous without more context. Are you suggesting that a broader range of files can be unzipped by this older zip protocol?

Richard

[Jonathan Harston]

On Thursday, 18 June 2020 17:47:47 UTC+1, Richard Deane wrote:

Jgh -  what do you mean by "stored"  files? Your reply is very ambiguous without more context. Are you suggesting that a broader range of files can be unzipped by this older zip protocol?

Stored files are files that are... um... stored. Not compressed. Storage method zero. All ZIP and UNZIP tools support stored files as it's the absolute base capability of any archiving tool.

See paragraph 4.4.5 in http://mdfs.net/Docs/Comp/Archiving/PKZip/APPNOTE

jgh

[Richard Deane]

Thank you for the explanation. Now  I comprehend your earlier message.

Richard

[Tony Nicholson]

Just a "heads up" that there's been additional work on the Z80 CP/M

version of UNZIP.  It now supports extracting files compressed with the

Deflate algorithm thanks to efforts by Martin, Keir Fraser and Russell

Marks.

This means it is now capable of extracting files from .ZIP archives

created by MS-DOS PKzip V2.04 and various Info-ZIP derivatives (on

Unix/Linux/macOS/Windows).

You'll find the latest version and update information on my GitHub at

https://github.com/agn453/UNZIP-CPM-Z80

Also, you can download the source-code and binary in a CP/M LBR

file for the latest V1.5-3 release from

https://github.com/agn453/UNZIP-CPM-Z80/blob/master/unzip/unzip153.lbr

Tony

[Tony Nicholson]

There's been an update to fix an issue with the Z-system version of the CP/M

Z80 version of UNZIP.  Previously some .ZIP files caused the program to hang

when trying to extract all files.

You'll find the latest version V1.8-7 available on my GitHub repository at

https://github.com/agn453/UNZIP-CPM-Z80

or download the source-code and updated binary in a CP/M library file

from

https://raw.githubusercontent.com/agn453/UNZIP-CPM-Z80/master/unzip/unzip187.lbr

Thanks go to Lars Nelson for finding and fixing this.

Tony

[Lumír Vaněk]

I've tested it on Z-System - works fine - thanks !

Bye,

Lumir

st 16. 6. 2021 v 1:38 odesílatel Tony Nicholson <agn...@gmail.com> napsal:

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[ladislau szilagyi]

Tested UNZIP187.COM, works fine.

Thanks,

Ladislau