https://github.com/larsbrinkhoff/squeeze

CP/M SQUEEZE and UNSQUEEZE for Unix
https://github.com/larsbrinkhoff/squeeze

Last synced: 7 months ago
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CP/M SQUEEZE and UNSQUEEZE for Unix

• Host: GitHub
• URL: https://github.com/larsbrinkhoff/squeeze
• Owner: larsbrinkhoff
• Created: 2020-10-10T17:02:58.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2020-10-10T17:05:03.000Z (about 5 years ago)
• Last Synced: 2025-04-09T19:12:39.644Z (7 months ago)
• Language: C
• Size: 15.6 KB
• Stars: 8
• Watchers: 3
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README

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README

          
Included in this distribution of 'sq' and 'usq' are:

	1) sq.1			- man page

	2) sqcom.h		- header file for sq and usq compilations

	3) sq.h			- header file for sq compilations

	4) usq.h		- header file for usq compilations

	5) sq.c, tr1.c, tr2.c,

	   sqio.c, sqdebug.c	- sources for sq

	6) usq.c, utr.c		- sources for usq

	7) makesq, makeusq	- 'make' files for sq and usq

	8) README		-  this file

With the exception of providing 'make' files for Unix, Xenix, etc. systems,

I have not included compilation instructions for other compilers.  The

only thing you need to know is which modules are linked with which programs.

To link 'sq', compile:

	sq.c

	tr1.c

	tr2.c

	sqio.c

and then link the four object files with your standard libraries to produce

the binary for 'sq'.  If you need to debug 'sq', compile sqdebug.c, set the

DEBUG #define in tr2.c, recompile tr2.c, and relink the above four files

plus sqdebug.

To create 'usq', compile:

	usq.c

	utr.c

and then link the two object files with your standard libraries to produce

the binary for 'usq'.

There are two system-dependent #define's in sq.c which may need to be

modified.  They are at the beginning of the source (after the large block

of comments), and are FNM_LEN and UNIX.

FNM_LEN should be set to the maximum length of a file name on the target

system.

UNIX should be defined for Unix or a derivative, and undefined (i.e.,

commented out) for CP/M, MP/M, MS-DOS, PC-DOS, or any system that

has separate file "names" and "types" (delimited by a period).

I have compiled and tested the code with the following compilers on

the following systems:

system "C" compiler		Xenix (Altos 586)

system "C" compiler		Unix BSD 4.2 (Vax 780)

system "C" compiler		Zeus (Zilog Z8000)

Computer Innovations C86	PC-DOS (MS-DOS) (IBM PC, etc.)

Computer Innovations C86	CP/M-86 (Altos 586)

DeSmet C88			CP/M-86 (Altos 586)

Aztec C II			CP/M-80 (CompuPro)

If some of the code looks funny (read: slow), remember that it has to be

portable accross all the above systems, and I get tired of too many

#define's.  If you successfully port it to some system that requires

minor (but backwards compatible) changes, let me know, and I'll update

them into my sources, and make sure they still work on the above systems.

Oh, and also, for those of you who argue that compact and uncompact should

be used under Unix, consider the following:

1)  These programs are compatible with the popular 'SQ' and 'USQ' programs

found on many bulletin board systems.  Files squeezed by other programs

will always be unsqueezable by any version of 'usq'.

2)  You have the sources yourself.  PLEASE don't make changes which affect

the internal format of the squeezed file.  This causes great portability

and compatibility headaches.

3)  'sq' and 'usq' are faster than compact/uncompact, and since they use

an adaptive Huffman coding, rather than a fixed one, they compress files

as well or better.

Notes for version 3.2:

Several files were modified as per the following request. Other than adding

parens and incrementing revision number, there were no changes. This has been

tested on the system "C" compiler under Berkeley 4.2BSD [VAX 750].

-William Swan

    Date: Friday, 3 May 1985

    From: Richard Hartman

    To:   Keith Petersen

    The following SQU-PORT files needed to be modified to work with DECUS

    C compiler on VAX/VMS.

	sqio.c tr1.c tr2.c usq.c utr.c

    The modification was minor, each statement of form:

	return x;

    is required to have a parenthesized expression:

	return (x);

    this change will not affect adversely any compiler I know of (and it

    is better style anyway...) so I suggest that it be added into the

    source SQU-PORT when it is convenient.