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************************************************************ An effective use of DIET version 1.10a ------ by Teddy Matsumoto --------- ************************************************************ 1. Let's try DIET! A new revolution in file compression technology is made by TSR mode. DIET.EXE is a file compression utility as well as a file utility to use compressed files. Diet can compress executable files and can execute them as LZEXE or PKLITE. WHAT is REALLY NEW in this program is to compress DATA files, too. Yes, we do have to decompress the data file to use them if they are in compressed form. And that's what actually happens. If you let DIET stay as a TSR program, then you don't have to care about whether data files are compressed or not. Let us try some examples' first. 2. The simplest and the most effective use of DIET. A rough classification of files of DOS may be in two categories, namely executables and data files. The former activates the later in general. The number of files on your disk of the later category is greater in most of the cases than the former. DIET can compress both categories of files, but these two categories behave differently. Executable files are compressed with some self -extracting header and decompressed on the memory to the original format. Naturally there are executable files with overlays or files which overwrite itself. Data files on the other hand, have to be restored to the original form when they are referred from the executable files. The process is carried out manually or by batch mode ordinarily. The revolutionary idea of DIET is that the program takes care of expansion and compression automatically while you are not conscious of what's really going on! If you are reading this file with DOS command MORE.COM then stop it. And try: Diet MORE.COM -------MORE.COM is compressed. Diet diet110a.doc ----this document will be compressed. Diet -z -p ----------let diet stay on memory. If you have EMM.SYS, then you will see diet uses 1 page of EMS. more < diet110a.doc -- to read the compressed file with compressed COM file, a pager. How do you like it? Don't forget to type finally, "diet -zr" to let TSR part detached from your memory. If you're a man of curiosity, try CHKDSK twice, when DIET is on the memory and off the memory to know the size of TSR part of DIET. When DIET is stay resident on your memory, you can do your normal work as if none of your file is compressed by DIET. There were many files with overlays which could not be compressed by LZEXE, PKLITE or by earlier version of DIET. The TSR mode DIET will handle these files easily without letting you be conscious of them being in compressed form. TSR mode of DIET has a very strong power and control over the programs. However, if you are anxious of any kind for the TSR mode, please start using DIET with non-TSR mode, until you could get a full understanding of its principle of actions in non-TSR mode. Diet is worth using even in nonresident mode only. Use of DIET, non-TSR mode. ~~~~~~~~~~~~~~~~~~~~~~~~~~ Type DIET to see all the command and options available. There are very few commands you have to remember in the non-TSR mode -l,-r and -ra are the all you need to know now. Let us now compress an application software. As an example we take QH.EXE and RM.EXE, accompanying file for MSC ver 6.00. If you do not know the programs, you do not need to know what they are. RM EXE 33337 2-20-90 5:22a Let us first type 'rm -h' to see the help-screen of RM.EXE. -------------------------------------------------------- Microsoft File Removal Utility. Version 1.01 Copyright (C) Microsoft Corp 1987-90. All rights reserved. Usage: RM [/help] [/ikf] [/r dir] files ............................ 'rm' terminated abnormally. Exit status = 1 Real time in seconds: 0.330 --------------------------------------------------------------- The last line is just an approximate time measured to see the help screen. Now you compress RM.EXE with DIET by 'diet rm.exe'. --------------------------------------------------------------- <<<< exciting file slimming exerciser 'DIET' version 1.10a >>>> .... copyright(c) 1991,4/1 by Teddy Matsumoto .... Compress 'RM.EXE' ......... Success! (33337 to 22192 bytes) -------------------------------------------------------------- The file is compressed to about 2/3 of the original. You may execute RM.EXE from this compressed file. -------------------------------------------------------------- 'rm' terminated abnormally. Exit status = 1 Real time in seconds: 0.490 -------------------------------------------------------------- That is, you just need a fraction of a second to expand the file to the original size and execute; 0.490-0330=0.16 seconds. When you deal with a file with larger size, the you gain more space to store the file, but you need more time to expand. Compress 'QH.EXE' ............................... Success! (120005 to 76976 bytes) This is a significant gain in size, but you will certainly feel some delay in time before you see the screen. There are similar utilities PKLITE and LZEXE with this executable file compression utility. DIET differs from other utilities in its capability to compress data files. However, you must know DIET in its TSR mode in automatic compression and decompression of data files. In the following examples, MICROSOFT WORKS is used to illustrate the functions of DIET. Files with Overlays. ^^^^^^^^^^^^^^^^^^^ Now let us move to the directory c:\works where you are supposed to setup the Microsoft Works. Let us try to compress the main executable WORKS.EXE with DIET.EXE. The following message will appear. ------------------------------------------------------------ <<<< exciting file slimming exerciser 'DIET' version 1.10a >>>> .... copyright(c) 1991,4/1 by Teddy Matsumoto .... Compress 'WORKS.EXE' - file size mismatch! (may be overlay file) Use -V or -I option to continue to process. to compress EXE file together with overlay or help files by wild card specification: diet -v works.* ------------------------------------------------------------ <<<< exciting file slimming exerciser 'DIET' version 1.10a >>>> .... copyright(c) 1991,4/1 by Teddy Matsumoto .... Compress 'WORKS.EXE' (overlay mode) ........................... ............................................................... Success! (382430 to 294903 bytes) Compress 'WORKS.OVL' .......................... Success! (100922 to 83327 bytes) Compress 'WORKS.HLP' ................................. Success! (132552 to 77430 bytes) ------------------------------------------------------------ Small Files with -b Option. ^^^^^^^^^^^^^^^^^^^^^^^^^^^ There are other files you can't compress. WORKS.PIF and WORKS.INI. To compress these files, try 'diet -b works.*'. Note, that DIET accepts wild cards and multiple file names on a command line like ' diet -b works.ini works.pif'. <<<< exciting file slimming exerciser 'DIET' version 1.10a >>>> .... copyright(c) 1991,4/1 by Teddy Matsumoto .... Compress 'WORKS.INI' . Success! (52 to 47 bytes) Compress 'WORKS.PIF' . Success! (369 to 108 bytes) L option To list DIETed files. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ To see files compressed by DIET you type 'diet -l' to see: ------------------------------------------------------------------ <<<< exciting file slimming exerciser 'DIET' version 1.10a >>>> .... copyright(c) 1991,4/1 by Teddy Matsumoto .... ------ listing of DIET files matched with '*.*' ------ WORKS.EXE WORKS.HLP WORKS.OVL WORKS.INI WORKS.PIF ------------------------------------------------------------------ Files DIET fail to compress. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Try 'diet THESAR.LEX'. ------------------------------------------------------------ Compress 'THESAUR.LEX' ........................................ ............................................... Compressing failed! (329707 to 348707 bytes) ------------------------------------------------------------ The file itself seems to be compressed by some other method already. Generally, diet will fail to compress files with extensions: .ARC, .ARJ, .LZH, .PAK, .ZIP These are compressed in themselves and cannot be compressed any more. This does not mean that ARC, ARJ, LHA, PAK or PKZIP cannot compress files compressed by DIET. DIET will not compress executable files already compressed by similar utilities as PKLITE or LZEXE. There are certain exceptional TSR programs which will conflict with DIET.EXE. The files compressed by earlier versions of DIET.EXE bear no marks that they are compressed and will be further compressed by this new version, but the file will fail to execute. This version will be compatible with the versions 1.01a up on. If you type 'works', then you will see messages : ------------------------------------------------------------------ DIET file! DIET file! 'works' terminated abnormally. Exit status = 36 Real time in seconds: 0.170 ------------------------------------------------------------------ and you see the program abort. This is because WORKS.EXE cannot load its overlay module WORKS.OVL. Proceed to read DIET in TSR mode. DIET in TSR mode. ================ To let DIET stay on the memory, you use -Z option: diet -Z You will see a message "diet stayed on the memory", and if you have EMM.SYS in your config.sys file, you will see, also, "EMS page 1 used by diet". That is, DIET's resident part resides mainly in EMS except for only a small part of the program. You start with the following DIETed files. ------ listing of DIET files matched with '*.*' ------ WORKS.INI WORKS.EXE WORKS.OVL WORKS.PIF WORKS.HLP Now WORKS wakes up if you type 'works', you will see the screen slower perhaps 10 or more seconds than usual. Then just quit from WORKS and check the list of DIETed files. You will notice WORKS.INI is no longer compressed, and its size in the original size before compression. ------ listing of DIET files matched with '*.*' ------ WORKS.EXE WORKS.OVL WORKS.PIF WORKS.HLP Now you see resident part of DIET hooks necessary files to activate the program WORKS. It keeps the files opened in Read mode in their original sizes and expand the files opened in their original sizes, so that DIET can transact these files. You can edit or compute files opened from Works from their compressed state and expand and rewrite them in uncompressed form. You could keep them compressed by typing 'diet *.*'if you wish. However, here is a better idea! Auto recompress mode. ^^^^^^^^^^^^^^^^^^^^^ This mode is supported from this version on. You can edit or modify compressed files automatically opened up and save them as they are in COMPRESSED form. First prepare 'CONFIG.SYS and AUTOEXEC.BAT files NOT compressed by DIET.EXE. You may compress COMMAND.COM if you wish. The system will boot with compressed COMMAND.COM. Prepare EMM.SYS or any other equivalent for device=emm.sys or by hardware setup program in CONFIG.SYS so that the resident part of DIET.EXE will reside in Expanded Memory. Next insert a line in AUTOEXEC.BAT file '\bin\diet -z -p', meaning DIET.EXE being resident in memory, being prepared to compress files once opened in read-write mode. Another line set TMP=e:\, where the drive 'E:' is supposed to be a high speed memory device such as a ramdisk or a hardram. When you boot up your system, then you will see a message: ------------------------------------------------------------ <<<< exciting file slimming exerciser 'DIET' version 1.10a >>>> .... copyright(c) 1991,4/1 by Teddy Matsumoto .... Stayed on memory! (use EMS 1 page) auto recompress : on (with messages) temp. directory : E:\ ------------------------------------------------------------ You may edit file readme.wps. Works.exe contains a word-processor as a part of its function and suppose you finished editing and saved the file. If you are really working with WORKS.EXE, you must quit from this software. When you quit, watch carefully the screen to capture the message Compress README.WPS...... Success ! (27334 to 19345 bytes) Yes, that's the DIET in action, DIET expanded the compressed file readme.wps and edited in the expanded form, saved as it is. Then when the process terminates, DIET is hooked up and compressed the file opened for read and write. 3.Basic Functions of DIET. ========================== There are 4 basic functions of DIET.exe,i.e. to COMPRESS files: to DECOMPRESS compressed files: -r -ra -v -i -b options; to make DIET terminate and stay resident: -z,-za,-zd -zr -p options and to list files or to test for compressed: -l -c -m options. Usage: DIET [options] [file_names]. Options: -r,-ra,-v,-i,-p,-z,-za,-zd,-zr,-o,-t,-i,-m, -b or -a. You may use '-' of '/' as the switch-character as you prefer. If you do not specify option, then the function is to compress. Or if you don't specify any option nor file name, then diet will display the help screen. File_Names: You can't omit file name input except for -l option. You can use WILDCARDS and MULTIPLE filenames on the command line. File Compression: If none of the options -l,-r,-ra,-z,-za,-zd and -c is specified, Diet compresses specified file(s), except when the given file is already compressed by DIET or the extension is LZH. Different headers will be attached to compressed files according to the extensions COM, EXE or ELSE respectively. IMPORTANT NOTE. DIET will overwrite on the original files except with -o option. The storage space save DIET makes no backups in principle. If you are not sure of the result, please take a backup of the file(s). You will be assured of the safety precautions designed in this software after using it for some period of practice. However we strongly recommend to take backup of files when you use with other TSR programs and when your available memory is not large enough. The dynamic Lempel-Ziv method adopted in the software may fail to compress files compressed with other tools. The success or failure in compression is determined by the number of clusters a file needs for its storage. File Decompression: With -r or -ra option, DIET decompresses files it had compressed. With '-r' option files with extensions EXE and COM remain compressed and other files are restored. Namely, this is to restore all the data files to the original. With '-ra' option, you could restore all. TSR On/Off option. '-z' ,'-zr'. DIET -z will announce either "stayed on memory' and "removed from memory". When you compressed COMMAND.COM or when you compressed some overlay files, you need DIET to be resident on, memory. I recommend you to write a line "diet -z" in your autoexec.bat file, if you are an expert DIETER. You may change the size of resident part of DIET by specifying positive integers from 1 to 9 after '-z' like: DIET -z8 (default value is 2). If you increase the number, the resident part grows in size with faster compress-decompress actions. DIET uses 1 page from EMS (Lotus-Microsoft ) if it finds one. The size of the resident part is reduced by the EMM.sys utility. IMPORTANT NOTE. This is not only for DIET, but if you use multiple TSR programs, be careful to unload according to the reverse order they were loaded into the mammary. Temporary Enable/Disable TSR part of DIET. DIET -zd disables resident part of DIET without unloading. DIET -za enables resident part of DIET without reloading. The second command restores the resident DIET when an interrupt was received from keyboard or from any other device's. Remember this switch, when you pressed Ctrl-C or Ctrl-Break while DIET had been acting. LIST files compressed with DIET. DIET -L will list files compressed with DIET. You may skip wild card for the option. Check Files Compressed by DIET. DIET -C <file_name >. Check the file if it is compressed by diet, and checks CRC for the integrity. Backup Files, Output Directories. By default, DIET overwrites files by compressed equivalent with the same name. So if you want to back up the files before you apply DIET by '-o' option. <Example 1>. You are not on DRIVE A: and you want the compressed file of alpha.dat on A: with the same name on your current directory: DIET -O A:alpha.dat. <Example 2>. Compress the file alpha.dat on the current directory compressed, and record it on the directory C:\TEMP: DIET -OC:\temp\ alpha.dat ^ ^ Please note the positions of the spaces and back slashes. <Example 3>. beta.dat has been compressed by DIET on the current directory. Decompress this file and record it on the root directory with the name alpha.dat: DIET -R -O\alpha.dat beta.dat Specify Directory for temporary files: By default, DIET makes temporary files on the current directory. It is recommended to specify the directory on which temporary files to be made with the TSR mode. DIET makes temporary files very frequently in TSR mode, consequently, if DIET could use High Speed Memory Devices, DIET runs smooth and easy. In case of nonresident mode, DIET compresses and decompresses on memory, in principle, so you need not use this option. DIET -Z -TD:\temp\ , where d: is supposed to be a RAMDISK. DO NOT FORGET THE LAST "\" in this option. ~~~ Ignore Warning Messages:DIET -I [file_names]. DIET ordinarily stops compression for the files with overlays when the size of the file in EXEHDR information is not the same, with the message 'may be overlay files'. Since DIET can take care of overlay files in the TSR mode, DIET may ignore warnings and continue compression with '-I' option. Those who use DIET only in nonresident mode should refrain from using this option. There are EXE files which are loaded in high memory. DIET warns you with the same message as overlays, but you can't expect to have a smooth action with such executables. Overlay mode option -V. DIET compress executables as self-extracting compressed file in general, but with this option on, DIET uses overly type compressions. A self-extracting file can be executed by itself if and only if the entire file is expanded in the memory. Files compressed in Overlay Mode is executed only when the resident part of DIET is active. However, Files compressed in overlay mode are expanded as temporary overlay modules loadable as requested. You can compress large files which can not be fit in the memory in overlay modules. In general files compressed in overlay mode need no self-extractig header, consequently they are smaller than the files in self-extracting mode. Auto recompress DIET -p [options] [file_names] This switch is a toggle. You need resident part of DIET to be active with this option. Auto recompress is disabled in DIET defaults, so you must always enable this switch. DIET -p will disable the switch. Japanese Messages Outputs: DIET -J [options] [file_names]. I am sorry that some witty succinct Japanese messages are not imbedded in English messages. However, if you have JDOS4.0 from IBM Japan, you may listen to the advice of DR.Matsumoto on the present shape of your disk health status. No message:DIET -M [options] [file_names]. If your screen is mixed up with the messages from DIET activated as a child process from your editor etc., use this switch to make DIET silent. Read Only Attribute: DIET -A [options] [file_names]. This is only for the sake of safety. This will make all the data files to have attribute read-only. If you are using DIET in resident mode, your editors invoke diet to decompress a compressed file, if not your data files are not compressed. In case your editor opened a compressed file, when you don't have DIET resident, your editor may not be able to quit from editing compressed binary file. A rare possibility, it might be. This switch makes all the compressed file to be read-only. You can not edit a file without changing its attribute. Please note, if you copy a file from the original position, then its file size will normally be restored to its original size. 4. Environmental Variables. ~~~~~~~~~~~~~~~~~~~~~~~~~~~ DIET from version 1.02x refers to the following environmental strings. DIETOFF File_names for which DIET is disabled to act in resident mode. DIETSIZE File_names which returns the real size of compressed files when referenced. DIETOPT set options you use as your defalut. Valid only for the options -b -v -j -i -a . ** NOTE reference to environmental string is possible only in MS-DOS ver3.xx or after. [ DIETOFF ] DIET in its resident mode has a powerful control over files. In return, we have to be careful for its subsidiary actions. For an example, when you copy compressed files: COPY diet102b.doc diet110a.doc you will know diet110a.doc has the original uncompressed file size. Of course you can type: DIET -ZD COPY DIET102b.DOC DIET110A.DOC to produce an exact copy of compressed size, yet it is better to SET DIETOFF=COMMAND.COM;FC.COM;XCOPY.EXE to the effect typing, dumping and copying without reproducing files to original sizes. Register names of program to DIETOFF to disable reproduction of the uncompressed files. You don't have to specify full path names. DIET just ignores them and is concerned with program names only. [ DIETSIZE ] There are programs which read in data files only to the size obtained by the Function Call AH=4Eh/4F/h. In earlier versions of DIET, it fails to read the data properly for such programs. This string refers to such programs. SET DIETSIZE=**.COM;***.EXE will enable **.COM and ***.EXE to read compressed MSG or HLP files, and will disable them to return "Wrong file" messages. Unfortunately, there are many files including SK.COM, which checks data files with other methods for different versions. [ DIETOPT ] You can set options you use as default: <Example.> set DIETOP=-b -v. 5. Other Comments. ~~~~~~~~~~~~~~~~~ File Open Error message. When DIET is in its resident mode, you may see a message "Can't find abc.exe" even if the file exists. DIET usually decompresses files on the directory specified by -T option, and if it fails to find enough room to decompress, DIET says that it could not open the file. However, there are programs which say "cannot find ...." when it fails to open a file. Temporary File Names. Using DIET in resident mode, you will often see files with names such as __DIET__.*. You will get these files when you reset system or stop execution by Ctrl-Break. These are the temporary files generated by DIET. You may or may not erase those files, since they are under constant transactions. Warning ! ~~~~~~~~ The version has been well tested by many 'brave' people who were not afraid of uncountable backups, collisions with other TSR's or RESETings. However, we are not sure, yet, of unexpected bad timings with other resident programs or devices. Please be warned against the use of this software with other resident programs especially in its resident mode. The author can not be liable for the damages caused by the use of this program. Backup your files before testing every time you use with a new program. Our Distribution Policy. ~~~~~~~~~~~~~~~~~~~~~~~~~ The program together with the other packaged documents is copyrighted by Teddy Matsumoto. You may copy, distribute and use this program free of charge under the conditions: you may not charge for copying or distributions, you use this for your personal purposes, you are to follow up versions if you port, and you must copy or distribute the entire package. Acknowledgements ~~~~~~~~~~~~~~~~ To Haruyasu Yoshizaki who found the vital bug which I could not find up to the last moment, to K.Okubo who introduced this software outside of Japan, and to my friends in Fgal/Flabo forums on Nifty Serve who dared to hang on the earlier versions in spite of the hang overs from so many Hang Up's. How to contact the Author. ~~~~~~~~~~~~~~~~~~~~~~~~~~ Email to Teddy Matsumoto at GBG00230 on Nifty Serve. Users not resident in Japan may contact K.Okubo at 74100,2565 Compuserve , K.Okubo Genie, or c00236@sinet.ad.jp Revision History. version 1.00x Beta test versions. version 1.01a (2/01/91) First TSR version. version 1.01b (2/16/91) To detect EMS, routine checked the possible opening of files name "EMMXXXX0" in some cases incomplete. Some routines failed to act normally for DISK I/O by INT21h. version 1.02a (2/24/91) Changed method to detect charater devices. Use EMS to reduce the resident part of DIET. New environmental variable DIETOFF by which programs disabled in TSR mode. Returns decompressed file size when a program in DIETSIZE acknowledge interrupt AH=4Eh/4Fh. version 1.02b (3/04/91) If COMMAND.COM is set to DIETOFF,COMSPEC need not be present at the top of enviroment area. Bug for the -T option, temporary file not always generated on TMP directory, fixed. version 1.10a (4/01/91) Automated recompression supported -p option. From -z toggle to new -zr option. Byte count option -b added. TSR part now refers TMP and DIETOPT. DIET beeps when it fails decompression. Overlay mode and -v option newly designed. Support function call AH=4B03. Safely compress large files of approximately up to 1MB. A bug fixed with -o option where DIET failed to compress EXE files. ==================End of Diet110a.doc=============================