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- LBREXT.COM
-
- Size (recs) CRC Version Author/Latest Issue Disk
- 9k (66) C8CD 3.4 Howard Goldstein 9/91 Z3COM11
-
- 1- Syntax/Options 2- Notes
-
-
- LBREXT is something like LGET, except that LBREXT will extract 'crunched',
- 'squeezed' and 'LZH'-encoded files. It has a brief help display, invoked by
- typing '//' after the name.
-
- LBREXT maintains dates according to the most precise information available,
- either from ZSDOS, DateStamper's "!!!TIME&.DAT" files, the LBR's DRI-style
- member dates (ala' SETD.COM) or from CR23D-style imbedded datespecs, as
- appropriate. If DateStamper is not running, it operates like previous
- versions of LBREXT. Version 2.0 by Bob Peddicord.
- :1
-
- Syntax LBREXT dir:lbrname dir:afn1,dir:afn2,... o
-
- Options U - uncompress squeezed/crunched/LZH-encoded files
-
- O - overwrite existing files without being asked
-
- I - Inspect (confirm files before extracting)
-
-
- Wildcard filename(s) may be specified. Files will be extracted to the
- current directory if no output DU or DIR is specified. Don't forget to put a
- comma between filenames if specifying more than one filename. ^C aborts to
- the command line (if in the middle of a file, the output file will be
- deleted).
- :2
- LBREXT Notes - 1/6
-
- a. Vs 3.4 updates (09/27/91, Howard Goldstein):
- - Added Inspect option to allow "tagging" of files to be extracted.
-
- b. Vs 3.3 updates (08/02/91, Howard Goldstein):
- - Linked with the new version of the UNLZH module for compatibility
- with files compressed with CRLZH 2.0.
- - Fixed bug that caused "expansion errors" on certain squeezed files.
- - Made a few small changes which allow the program to work correctly
- and reliably under vanilla CP/M.
-
- c. Vs 3.2 updates (3/23/91, Howard Goldstein):
- -- Added code to extract creation and modify times from the library
- directory.
- -- Removed code that forced all extractions to default directory if
- wheel byte not set.
- -- Cleaned up I/O routines for a slight speed improvement.
- LBREXT Notes - 2/6
-
- d. Vs 3.1 updates (10/14/90, Howard Goldstein):
- -- If a destination directory is specified without a file name, *.* is
- assumed. As a side effect, .ext is equivalent to *.ext.
- -- If a CRC error occurs during file extraction, a warning message is
- displayed but LBREXT no longer aborts. This is to accommote older
- libraries that did not contain CRC's.
- -- LBREXT no longer needs to be manually patched in order to change the
- default configuration. A CFG file for use with ZCNFG is provided.
-
- e. Vs 3.0 updates (3/29/90, Howard Goldstein):
- -- Fixed bug in the SCAN routine that caused the program to misbehave
- occasionally in various unpredictable ways depending on the previous
- contents of memory.
-
- f. Vs 2.9 updates (1/11/90, Howard Goldtsein):
- -- Added CRC check during member file extraction.
-
- g. Vs 2.8 updates (12/27/89, Howard Goldstein):
- -- Correctly handles squeezed files with short extensions and uses the
- right default directory under BGii and Z3Plus.
- LBREXT Notes - 3/6
-
- -- ASCII strings before the option flags changed to upper case.
- -- Typos fixed in comments.
-
- h. Vs 2.7 updates (10/24/89, Howard Goldtsein):
- -- Now expands LZH encoded files as well as squeezed and crunched.
- -- Uses DSLIB routines (for ZSDOS, as well as DateStamper, support).
- -- When extracting members with date stamps, the output file's last
- access stamp is set to the current date and time.
- -- 'Mod' date, rather than 'create' date, is displayed
- -- Type spec on LBR file no longer ignored. LBR assumed if none given.
- -- Check for user abort now done once every 128 chars instead of before
- each char is extracted from LBR. BIOS calls used for this purpose.
- -- Buffer allocation more dynamic (type of decompression required and
- number of members extracted determine size of input/output buffers).
- -- (OVWRT>) moved from 102h to 111h. Another patch point UCPRS>) at
- 118h determines whether or not files are compressed by default.
- -- First two bytes of the member file (rather than middle letter) are
- checked to determine if file is compressed.
- -- Top of memory is determined from extended env if available.
- LBREXT Notes - 4/6
-
- -- Bugs fixed: endless loop when a member could not be found;
- inability to uncrunch certain files in large LBR'S; failure to
- recognize 'directory full' condition when opening output files.
- -- Version 4 LIBs and ZSLIB now required for assembly and linking.
-
- i. Vs 2.6 updates (3/24/88, Bruce Morgen):
- -- DateStamper compatibilty, including CR23D-style imbedded datespecs.
- Note that this version employs a modified version of the SYSLIB
- module LUOPEN, with the public 2-byte buffer called LUDATE holding
- the DRI-format date of the last LBR member opened. DSLIB and Sigi
- Kluger's DATE.REL (Z80ified version of the one from SIG/M v.226) are
- also required.
- -- A patch point is provided at 102H, change this byte to FFH (from
- zero) if you want LBREXT to overwrite any existing files as its
- default mode.
- -- The help screen now reflects the state of this new switch as well as
- the actual name of this program.
- -- Note: zero and FFH are the ONLY legal values for the patch point.
- LBREXT Notes - 5/6
-
- -- All previous LBREXT upgrades as of version 2.5 are supported, with
- the exception of the change in the file-list delimiter, which has
- reverted to the ZCPR3 convention (the comma) used in LGET and LPUT,
- as well as in LBREXT before Version 2.4.
-
- j. Vs 2.2 updates (9/10/87, Bruce Morgen):
- -- Made buffer sizing automatic at runtime
- -- Fixed bug so that files will be extracted to current directory if no
- output DU or DIR is specified
- -- Used DSEG and new Z80-only Z3LIB and SYSLIB beta versions to mini-
- mize COMfile size,
- -- Slimmed down buffer setup code somewhat
- -- Did some nit-picking ("ADD A,A" instead of "SLA A", "OR A" instead
- of "CP 0", etc.) in critical spots that might contribute to overall
- performance, although the optimized (at least for uncrunching
- operations) buffer allocation is probably the biggest factor.
- -- LBREXT is now competitive in speed (within 5-10%) with LGET for
- normal and unsqueeze operations as well.
- -- Included a Z80fied version of Joe Wright's improved ARGV from LX 1.1
- to prevent system crashes with LGET if "=" is used in command line.
- LBREXT Notes - 6/6
-
- h. Vs 2.1 updates (Bob Peddicord):
- -- Restored proper ZCPR3 tool format, increased buffer size.