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- 20 July 93
-
- LIMIT version 1.0
-
- Data Compression Archive utility
- -------------------------------------------------------------------------------
-
- LIMIT is a fast and compact data compressor/archiver. The compression &
- decompression routines have been written entirely in 80286 assembly, so it
- runs faster than many other archivers. LIMIT also compresses better than
- other archivers; it uses a compression method based on 32K sliding window
- dictionary plus huffman encoding, similar to LHA/PKZIP/ARJ, but with some
- improvments.
-
- LIMIT is free! You may distribute freely, as long as the program is not
- modified in any way. You are encouraged to contribute $20/- to the
- programmer if you like this archiver.
-
-
-
- 1. Files included in LIMIT 1.0
- ===============================
-
- LIMIT.EXE the executable file
- LIMIT.DOC LIMIT documentation
-
-
- 2. System requirements
- ===============================
-
- 80286 (PC/AT) and above
- Minimum conventional memory:
- 270k for updating/creating archives
- 170k for extracting/testing archives
-
-
- 3. How to use LIMIT
- ===============================
-
- Usage:
- LIMIT command [options] archive[.LIM] [files] [@listfile] [#commentfile]
-
- The special prefix '#' specifies a comment file to be added/deleted to/from
- archive. Prefix '@' species a list file to be included.
-
- A list file is a text file consisting of file specfications separating by
- space/tab/newline.
-
-
- 4. Commands
- ===============================
-
- a[dd] add files to archive, create one if necessary
-
- c[reate] create new archive
- (delete previous archive of the same name)
-
- del delete files (or comment) in archive+
-
- e[xtract] extract files in archive
-
- h[elp] display help information
-
- i[nfo] archive info
- shows summary of archive
-
- l[ist] list specified files in archive
-
- rd remove directories
- (directories must be empty.)
-
- t[est] test files in archive by perform CRC checks
-
-
-
- 5. options: (use - or / prefix)
- ===============================
-
- -x<files> exclude files from the file list
- a list file may be specified: -x@listfile
-
- [commands: a,c,del,e,rd,t]
-
- -d<dir> add/extract directory
- adding files: specifies the path to add files to
- extracting files: specifies the path to extract to
-
- [commands: a,c,e]
-
- -n add/extract new files only
-
- [commands: a,c,e]
-
- -r recurse sub-directories
-
- [commands: a,c]
-
- -s recurse and store/extract partial paths
- files are added/extracted to their partial paths
-
- default: all files are added to root directory,
- and extracted to the current directory
-
- [commands: a,c,e]
-
- -p store/extract full original paths
- files are added/extracted to their original paths
-
- default: all files are added to root directory,
- and extracted to the current directory
-
- [commands: a,c,e]
-
- -w[h|s] include hidden or system files
- default: hidden/system files are not added to archive
-
- [commands: a,c]
-
- -es extract to screen
- default: extract to file
-
- [command: e]
-
- -y yes to all queries:
- 1) del command: "delete all files?"
- 2) e command: "overwrite file?"
-
- -m[0|1|s|x] compression methods:
- -m0: store only
- -m1: normal compression (default)
- -ms: fast compression
- -mx: maximum compression
-
- [commands: a,c]
-
- 6. Examples
- ===============================
-
- LIMIT a test *.c add all *.c files to test.lim archive
-
- LIMIT a test /dabc add all (default) files to directory "abc" in test.lim
-
- LIMIT t test test (using CRC checks) the archive test.lim
-
- LIMIT l test *.asm list all *.asm files in test.lim
-
- LIMIT l test \abc\* list all files in \abc directory in test.lim
-
- LIMIT e test extract all files in test.lim to current directory
-
- LIMIT e test /n extract all new files in test.lim to current directory
-
- LIMIT e test /y extract all files (overwrite, no query) to current dir
-
- LIMIT e test *.c /dc:\ extract all *.c files to C:\
-
- LIMIT del test *.h delete all *.h files
-
- LIMIT rd test \temp remove \temp directory in archive test.lim
-
- LIMIT i * shows information of all archives in the current dir
-
- LIMIT a -mx test add all files to test.lim, with maximum compression
-
- LIMIT a test /whs add all files (including hidden & system) to test.lim
-
- LIMIT a test \abc\*.* /r /p add files, recurse sub-dirs and store full
- paths, i.e. include directory \abc
- LIMIT a test \abc\*.* /s add files, recurse sub-dirs and store new
- paths (excluding directory \abc)
- LIMTI a test \abc\*.* /r add files, recurse sub-dirs, store all files
- in root directory
- LIMIT a test \abc\*.* /p add files, store full paths
-
- LIMTI e test /p extract all files and subdirectories into
- original paths
-
- 7. Setting the environment string LIMIT
- ========================================
- Options that are included in the environment string LIMIT are automatically
- included whenver LIMIT is run. To set the environment string, type
-
- > set LIMIT = /mx /n
-
- This tells LIMIT to use maximum compression and add/extract newer files only.
- However, options specified in the command line override those options in
- the LIMIT environment string.
-
-
- 8. Compression method
- ===============================
- LIMIT employs a LHA/PKZIP/ARJ-similar kind of sliding dictionary plus huffman
- encoding, with some minor enhancements.
-
- A compression index controls the extent to which strings are searched in the
- dictionary. The index for each compression option is as follows:
-
- /ms (fastest) compression: 30
- /m1 (default) compression: 300
- /mx (maximum) compression: 3000
-
- However, there are files where a smaller index yields better compression.
- You may fine-tune the compression by controlling the index, using option
- /c<index>.
- e.g. LIMIT a /c1000 archive *.*
-
-
- 9. Bugs/Comments
- ===============================
- No program is free of bugs, so report any bugs or comments or suggestions to
- the programmer.
-
-
- 10. Contributions, please!
- ===============================
- LIMIT is the product of thousands of programming hours. If you like this
- program, please contribute some money ($20 would be great!) to the programmer
- as a token of encouragement.
-
-
- -------------------------------------------------------------------------------
-
- J Y LIM
- jlim@sunlab.cit.cornell.edu
- 226, Linden Ave. Apt 1.
- Ithaca, NY 14850
- USA
-