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UPDATE.TXT, ARJ 2.70 OFFICIAL RELEASE September 1999
This documents new or updated information since ARJ 2.60.
Please refer to UPD260.TXT for more information.
** IMPORTANT NEWS ****************************************************
** THIS RELEASE OF ARJ USES A NEW REGISTRATION SCHEME WHICH **
** OBSOLETES ALL PREVIOUS REGISTRATION KEYS. YOU CAN **
** OBTAIN A REPLACEMENT REGISTRATION KEY FROM ARJ SOFTWARE, **
** INC. PLEASE PROVIDE AS PROOF YOUR OLD REGISTRATION KEY **
** OR A PRINTOUT OR A SCREEN CAPTURE OF YOUR ARJ.EXE **
** REGISTRATION DISPLAY. **
** THE UNREGISTERED DEARJ DOES NOT SUPPORT VOLUMES. **
Several users have reported that various releases of ARJ have
caused (false) VIRUS ALARMS from certain versions of Norton
AntiVirus for Windows software. This release and all previous
releases have been checked by IBM, Norton, and McAfee virus
scanners.
** THIS RELEASE USES AN ENHANCED ARJ ARCHIVE HEADER FORMAT **
** COMPATIBLE WITH PREVIOUS VERSIONS OF ARJ. HOWEVER, **
** SOME THIRD PARTY ARCHIVER MENU PROGRAMS MAY NOT BE **
** COMPATIBLE WITH ARCHIVES PRODUCED BY THIS ARJ VERSION. **
The ARJ file header has been lengthened by a number of bytes to
support additional file properties. The new "-j$" option will
disable this new header enhancement.
It is RECOMMENDED that you run the TESTARJ.BAT batch file to
verify that this version of ARJ.EXE is compatible with your
computer system.
ARJ Software, Inc. is now marketing three archiver products, ARJ,
ARJ32, and JAR (JAR16/JAR32). JAR produces "J" archives which are
not compatible with ARJ. The 32 bit version of JAR (JAR32)
supports the Windows NT operating system version 3.50 and above as
well as Windows 95/98.
We have developed the new archiver, JAR, so that we could provide
state of the art data compression with solid archiving techniques
and new compression algorithms. These improvements could not be
added to ARJ without introducing serious compatibility issues with
older releases of ARJ. JAR16/32 compresses significantly better
than ARJ and PKZIP for many files and provides long filename
support for both Windows 9x and Windows NT. JAR16/32 duplicates
many of ARJ's powerful functionality and provides new original
functionality. However, it does not duplicate ARJ and it requires
more system resources (memory and cpu power) to run. It also is
more difficult for third party archiver software to support.
There are very few JAR add-ons. See our web site for a copy of
this archiver.
Please note that ARJ is our MAIN product and it is our intention
to continue supporting and enhancing the ARJ product. ARJ has the
advantages of a large installed base, a simple archive format,
significant third party software support, and a long history of
reliable performance. We also plan to provide ARJ support for
Windows.
A 32 BIT CONSOLE MODE ARJ32 FOR WINDOWS 95/98 AND WINDOWS NT IS
AVAILABLE.
This ARJ version has been changed with regard to the storage of
the SFX modules and the built-in help information. The change now
requires that MS-DOS 3.0 and above be used to access the SFX
modules and the help information. Under DOS 2.11, the help
screens and self-extractor creation will work if ARJ.EXE is
located in the CURRENT directory. This change frees up more
conventional memory for ARJ use.
At this release, ARJ will automatically roll a multiple volume
archive from the .A99 extension to .100.
The mailing address of ARJ Software, Inc. has changed as of
August 1993.
ARJ Software, Inc.
P.O. Box 249
Norwood MA 02062
USA
FAX: 781-769-4893
EMAIL: robjung@world.std.com
There is ARJ Web site support information added to the file
ARJ.TXT. It is excerpted below:
http://www.ARJSOFTWARE.com (ARJ homepage)
http://www.Dunkel.de/ARJ (German and English)
http://www.tsf.be (French and English)
You can find information about the world of ARJ on the Internet by
using various search sites including www.altavista.com,
www.yahoo.com, and www.dejanews.com.
Our credit card ordering procedures have changed. We now process
credit cards directly.
**********************************************************************
ARJ YEAR 2000 COMPLIANCE STATEMENT
See the file YEAR2000.TXT.
ARJ YEAR 2000 IMPROVEMENTS
This version of ARJ has been modified to allow the specification
of the century for the ARJ date options "-o" and "-ob". Prior to
this version, the ARJ date options would accept a date in the form
of YYMMDD. With this version, ARJ will accept dates in both
YYMMDD and YYYYMMDD formats. ARJ will presume that any year
specifications beginning with 19, 20, and 21 are YYYY type
specifications and any year specifications beginning with 80, 81,
82 .... 99, 00, 01 .... 18 are YY type specifications.
Example: -o980105 -> on or after Jan 5, 1998
-o19980105 -> on or after Jan 5, 1998
-o100105 -> on or after Jan 5, 2010
-o20100105 -> on or after Jan 5, 2010
-o201001051200 -> on or after Jan 5, 2010 12:00 P.M.
-o100105 -> on or after Jan 5, 2010 12:00 A.M.
ARJ-PROTECT ARCHIVE DAMAGE PROTECTION
ARJ has a feature "-hk" (since 2.60) where archive data damage
protection information can be saved when an archive is built.
This damage information can be used to repair slight amounts of
damage to either the archive header or file data. The competitive
product PKZIPFIX only fixes directory damage, not file data
damage.
This protection data must be created before the archive becomes
damaged.
New to this release is the enhancement of ARJ-PROTECT where the
damage protection data is appended to the archive instead of being
saved as a separate file (*.XRJ). In addition, once an archive is
ARJ-PROTECTED, ARJ will automatically ARJ-PROTECT that archive
during future updates with the level of protection originally used
(-hkX).
It is STRONGLY recommend that this option be used on important
archives and on archives saved on diskettes. Frequently used
diskettes are notorious for developing bad sectors and corrupting
data. The cost for this feature is some extra computer time and
about a one percent increase in archive file size.
See the "-hk" section for more information about this feature.
WINDOWS 98 SUPPORT
ARJ 2.60 and above supports Windows 98. In this document,
references to Windows 9x include Windows 95 and Windows 98.
LONG FILENAME SUPPORT
ARJ versions 2.60 and above support long filenames ONLY in the
Windows 95/98 graphical environment. ARJ 2.6x does NOT support
long filenames in Windows NT, NTFS, or OS/2. ARJ is a DOS program
that uses the special DOS hooks available in Windows 9x to access
the long filenames. This means that long filename support will
not be available via some software driver add-ons if they do not
provide the necessary DOS hooks.
In development is a 32 bit console mode version of ARJ32 that
supports Win 9x and Win NT long filenames. It is available for
public testing and comment as a test release. The 32 bit version
will provide full long filename support wherever Windows itself
supports long filenames. This is not always the case for the DOS
version of ARJ.
REMINDER: When specifying filenames with embedded blanks or
symbols like ">", "<", or "|" on the command line, you MUST quote
the filenames. Example: "Program Files\*.*"
When specifying a target directory name that contains spaces, you
must quote the directory name. If the name specification ends in
a "\" backslash (needed for a non-existent directory), you must
insert a space after the "\". Alternatively, you can use the
"-ht" option.
Example: ARJ x archive "C:\Program Files\ " or
ARJ x archive "-htC:\Program Files"
In addition, ARJ 2.62 and up supports the Win9x file properties
date-time accessed and date-time created. This support results in
slightly larger archives. The "-j$" option can be used to disable
this new feature. ARJ does not support the file attributes of
TEMPORARY or COMPRESSED.
WINDOWS LONG FILENAME LABELING
A very noticeable change is how ARJ archives files within Windows
9x. In 2.60, ARJ would label/mark all files saved in Windows
9x as Windows long filename files. In 2.61 and above, ARJ will
label as Windows long filename files only those files whose
Windows 9x filename is different from its MS-DOS filename. Note
that "NAME.txt" is NOT the same as "NAME.TXT" because of case. As
an aid, ARJ will display the count of long filenames encountered
when adding files or listing an archive. The longname test is
done based upon the filename or pathname specified by the user.
Filenames within a longname directory would not necessarily be
labeled as Windows long filenames if the filename specification
excluded the directory name.
The new "-hf4" option will set ARJ to label all files saved under
Windows 9x as Windows long filenames (as in ARJ 2.60).
To help locate Windows 9x files within an archive, ARJ has a new
"w" option for the "-hb" option. For extraction, deletion, and
listing, the "-hbw" option will select only files that are marked
as Windows long filenames files. This option is non-functional
for adding or updating files. It is limited to selecting files
within an existing archive. This option is useful when extracting
an archive in MS-DOS and encountering one or more "Requires
Win95/98/NT or -hf...." error messages. The user would be able to
view the files that are affected and take appropriate actions.
Example: ARJ x archive *.* (assume some Win9x errors)
ARJ x archive *.* -hf1
Windows 9x DOS support (and therefore ARJ) do not support
access to long filenames containing certain characters. For
example, a filename containing the copyright symbol or the
trademark symbol cannot be accessed in a Win9x DOS window with the
COPY command or with ARJ. These type of filenames can only be
accessed via their short names. The Win9x system normally stores
filename characters as two bytes per symbol allowing an alphabet
of 65536 possible symbols. Because Win9x DOS only uses one byte
per character position allowing only a 256 symbol alphabet, many
characters are displayed by Win9x DOS as "_".
COMPATIBILITY WITH ARJ32
With this release, a new program ARJ32 for Windows 95/98/NT is now
available. ARJ32 has been designed to support the Windows 32 bit
environment. It is generally compatible with ARJ for DOS (2.xx).
However, ARJ32 has an option to use the ANSI codepage to access
the file system instead of the default OEM codepage. This ANSI
codepage option would most likely be chosen by users using
languages containing foreign symbols.
Archives created using the ANSI codepage may not be processed
correctly by ARJ for DOS because of a filename translation issue
(ANSI to OEM codepage). Special symbols and foreign characters
may not be translated correctly. In addition, ANSIPAGE archives
have an additional compatibility issue with versions of ARJ from
2.30 and earlier. Those versions will treat ANSI codepage
archives as CORRUPTED ARJ-SECURED archives. This should not be
an issue since ANSI codepage archives should not be processed by
ARJ for DOS. ARJ 2.62c and above will not process such an archive
unless the "-hy" option is specified.
ARJSFX/ARJSFXV POST EXTRACTION EXECUTION OPTION
For software distributors, this version of ARJ provides for the
execution of a command after self-extraction. The ARJSFX and
ARJSFXV modules support the execution of a command after a
successful extraction.
The ARJSFX and ARJSFXV modules support the "-!" option which
allows the user to build a self-extractor which will execute a
command after its files are successfully extracted.
This option is most useful with the embedded command line feature.
The command must not contain any blanks if it is used in the
embedded command line. If a target directory is specified, the
target directory will be set as the working directory for the
post-extraction command.
Example: )) C:\DIR\ -!SETUP.EXE
The above example will cause the command "SETUP.EXE" to be
executed in the directory C:\DIR.
Please note that the user will always be prompted by the
self-extractor for permission to execute this command. This
prompt is disabled for ARJ-SECURED self-extracting archives.
ARJSFX/ARJSFXV VIRUS CHECK
Both the ARJSFX and ARJSFXV self-extractors now perform a simple
virus damage check before processing the self-extractor's archive.
If damage is detected, the self-extractor will abort with an error
message indicating possible damage.
This check will not work against a virus designed specifically to
attack ARJ self-extractors.
The ARJSFX self-extractor has a "-s" option to skip this virus
check. The ARJSFXV self-extractor has a "-a" option to skip the
virus check. You can include the above skip option as part of
a custom built-in command line.
ARJSFX/ARJSFXV VERIFY BEFORE EXTRACTION OPTION
Both the ARJSFX and ARJSFXV self-extractors now accept the "-x"
and "-t" options simultaneously to enable the testing of an
archive just before extracting the archive.
Example: )) C:\DIR\ -x -t
ARJSFXV PASSWORD PROMPT
A garbled ARJSFXV self-extracting archive will automatically
prompt the user for the password when extracting or testing the
archive.
You must use ARJ 2.61 and above to create the garbled archive as
well as create the ARJSFXV self-extractor.
Example: ARJ a vendor *.* -gpassword -je -v360
NOTE: If you create a garbled archive with ARJ 2.61 and above and
add ungarbled files and then delete the garbled files, ARJ will
continue to mark the archive as a garbled archive. Currently,
only the ARJSFXV module takes note of this marking.
ARJSFXV SUPPORT FOR FILE DTA AND DTC PROPERTIES
The ARJSFXV self-extractor will restore Win9x file date-time
accessed and date-time created properties from an ARJ archive that
contains those file properties. ARJ 2.62 and up can create such
an archive. This feature will only work within the Win9x GUI
environment. The "-j$" option can be used to disable this
support.
ARJ COMMAND LINE SHORTCUT
New to ARJ 2.62 and up is the expansion of command line directory
names to full wildcard specifications. However, this feature will
only work properly if the first filespec on the command line is
NOT a directory. The ARJ placeholder "..." can be used for that
first filespec. A directory name used as the first filespec will
result in that directory being specified as the TARGET directory
and affecting subsequent filespecs.
Example: ARJ a archive ... DIR1 dir2 dir\dir3
is equivalent to
ARJ a archive DIR1\*.* dir2\*.* dir\dir3\*.*
Example: ARJ a archive DIR1 dir2 dir\dir3
is equivalent to
ARJ a archive DIR1\dir2\*.* DIR1\dir\dir3\*.*
ARJ CONFIGURATION FILE
The ARJ configuration option specified by "set arj_sw=c:\arj.cfg"
or similar will now accept the commands: "ac", "cc", "dc".
ARJ RESPONSE FILE
ARJ supports the specification of the "-g" and "-g?" options on
the command line along with a response file specification.
Using this feature is more secure than putting a password
specification within an ARJ response file which is written to
disk.
SHAREWARE LIMITATIONS
After ARJ version 2.41a, full functionality of a small set of ARJ
software features may be limited to registered users.
ENCRYPTION
New to version 2.60 is a new encryption scheme based upon the
Russian encryption algorithm (GOST 28147-89 cipher). This
algorithm is similar in design to DES; however, GOST is designed
for software implementation. GOST 28147-89 uses a 256 bit key and
32 rounds of encryption. In addition, this implementation of GOST
also uses the 64 bit cipher feedback mode.
This new encryption is accessed by using the "-g" option to
specify the password and the "-hg" option to specify the new
scheme. This new scheme is in addition to the older XOR garble
scheme.
The encryption module is a separate COM file named ARJCRYPT.COM.
ARJ expects to find the encryption module in the same directory as
itself. This has the advantage of saving space with the ARJSFXV
module and the DEARJ.EXE module when encryption is not needed.
You simply do not include the encryption module in the archive
when not using encryption.
At this release, support for a new version of ARJCRYPT.COM has
been added. This new version will support passwords up to 64
characters in length. ARJCRYPT version 1.0 only supports
passwords up to 32 characters in length. This release of ARJ can
ONLY use ARJCRYPT.COM version 2.1. ARJ 2.60 can use the new
ARJCRYPT.COM version 2.1, but it will display a warning message
indicating that ARJCRYPT is not a standard ARJ garble module. ARJ
2.60 will still not be able to use more than 32 character
passwords.
The encryption overlay module is not included with this version of
ARJ. Because of USA export regulations, ARJ Software, Inc. may
not export the encryption overlay module from the USA. It is
available on the ARJ website for USA users only.
** Please NOTE that losing your password means losing your file!
** Please DO NOT ask for technical support on lost passwords.
** There is no shortcut/backdoor for determining lost passwords.
New to ARJ 2.61 and up is a limited key size version of GOST
encryption. ARJ now provides a "-hg!" option which invokes the
built-in 40 bit key version of the Russian GOST encryption
algorithm. The normal GOST algorithm has a 256 bit key size. This
limited encryption is provided to meet USA encryption export
rules.
The "l" command will now indicate the type of encryption method
used. See the "l" command below for more details.
ARJ CAUTIONS
Whenever archiving to diskettes, it is HIGHLY recommended that
the option "-jt" be used. This helps spot BAD diskettes or BAD
diskette drives. It is HIGHLY recommended that the "-jt" option
be used in a Windows or multi-tasking or network environment.
In addition, the diskette drive should NOT be read or write
cached. This allows the "-jt" option to work properly. For
Windows 9x, ARJ.EXE at 2.61 and up automatically forces a re-read
of the diskette drive.
The XMS accelerator in Hurricane 2.0 MAY interfere with the use
of the ARJ -hm! option within a Windows DOS box. You can use
the -hm option instead.
UNERASE or UNDELETE commands do not always recover a file/archive
correctly. This will result in damaged archives. This is true
for all archive types. You should always test an archive after
unerasing it.
CAUTION: To those who use the "-t1" and/or "-t1g" options to
save a few extra bytes, this option should only be used on TEXT
FILES. Those are files created by EDLIN, EDIT, QEDIT, BRIEF,
NOTEPAD, and others. Text files typically contain only letters,
numbers, spaces, and punctuation marks. WORD PROCESSOR format
files ARE NOT TEXT FILES! MS WORD, Wordperfect, AMIPRO, WRITE,
and similar files ARE NOT TEXT FILES. Using the "-t1" or "-t1g"
on any other kind of file probably will result in DATA LOSS!
ARJ ERRORLEVELS
ARJ will now return a DOS error code of 11 for a user control break
action. ARJ formerly returned a code of 2 for this situation.
ARJ will now return a DOS error code of 12 when trying to modify a
chapter archive that already has 250 chapters in it. ARJ formerly
returned a code of 2 for this situation.
ARJ COMMANDS
"g" command
At ARJ 2.62d and up, you can use the -hg or -hg! option to encrypt
an archive using the GOST algorithm. Only archives that are
ungarbled and created with ARJ 2.62 or higher can be garbled with
the -hg or -hg! option.
"j" command
With the addition of new encryption functions, it is important to
not mix encryption methods when joining archives. This current
version of ARJ will attempt to prevent that.
In addition, the dual-name and codepage properties should not be
mixed by the join command.
You should only join archives that have been created with very
similar options.
"l" command
"v" command
ARJ will display the count of files selected within an archive
that have Windows long filenames.
The listing format has been changed to better indicate the century
years. Instead of a "+" symbol to indicate the year 2000, ARJ will
now display a "0" for year 2000, a "1" for the year 2100. This
character appears immediately before the date-time field.
The "v" command will now display Win9x file date-time accessed
and file date-time created properties if they exist in the archive.
As of ARJ 2.62d, the output under the "G" of the BTPMGUX area is
changed. Instead of a simple "G" to indicate that the file is
garbled, that field may contain the values "0", "1", "2", "3", or
"4".
"0" indicates XOR garbling (archives created before 2.60).
"1" indicates XOR garbling (archives created at 2.60 and greater).
"2" indicates GOST encryption with a 32 byte password limit.
"3" indicates GOST encryption (ARJCRYPT.COM 2.1) 64 byte limit.
"4" indicates 40 bit encryption limit.
"y" command
When the "y" command is used with the "-g" option to ungarble an
archive, ARJ will automatically test the archive after the
ungarble. If the test fails, ARJ will abort the ungarble. There
is no option to bypass this test.
ARJ SWITCHES
"-g" switch
The garble option in this version of ARJ has three versions. One
is the original version found in earlier ARJ releases. It is
compatible with older versions and works like those versions.
The second garble version uses a separately available encryption
module.
This new option is accessed by using the new "-hg" option. This
option sets ARJ to use the separate encryption module to encrypt
the data. By default, ARJ will look for the file "ARJCRYPT.COM"
in the same directory where the ARJ.EXE being executed is found.
The user may specify the pathname of the module to use.
Examples: ARJ a archive *.doc -gThis_is_a_password -hg
ARJ a archive *.doc -gpassword -hgc:\dir\enc.com
The new garble option accepts a password key up to 64 characters
long. Excess characters are ignored. Garble passwords ARE CASE
SENSITIVE! DO NOT LOSE your password! There is no known method to
recover the password other than by brute force, which could take a
very long time. The longer the password, the longer it would take
to "guess" it.
ARJ 2.60 which also accepts the "-hg" option will only handle this
garbled archive if the password is 32 characters or less.
ARJ 2.60 can use ARJCRYPT.COM version 2.1; however, it will
display a "Not a standard module" warning message.
A variation of the "-hg" option is "-hg!". This "-hg!" option
accesses a built-in version of GOST that is limited to a 40 bit
key size. This algorithm is designed to meet USA encryption
export rules.
These new encryption schemes are not compatible with the "-g"
option of pre-2.55 versions of ARJ. If you want to maintain
compatibility with pre-2.55 versions of ARJ, you should NOT use
the "-hg" option.
Only the multiple volume self-extractor (ARJSFXV) supports the new
encryption module.
When garbling or ungarbling an existing archive, ARJ will detect
the method of encryption previously used and select that same
method regardless of whether the "-hg" option is specified or not.
"-oa" switch
The "-oa" and "-oab" switches allow the user to select files under
Windows 9x based upon file date-time last accessed. "-oa" selects
files after the date value, "-oab" selects files before.
This ARJ version does NOT support combining "-o", "-oa", "-oc" with
one another. You CAN combine "-oa" with "-oab".
"-oc" switch
The "-oc" and "-ocb" switches allow the user to select files under
Windows 9x based upon file date-time created. "-oc" selects
files after the date value, "-ocb" selects files before.
"-odb" switch
The "-od" and "-odb" switches allow the user to select files based
upon the number of days from today. The "-odb" switch allows the
user to select files modified before the specified number of days
from today. You CAN combine the "-od" and "-odb" switches.
"-v" switch
At this release, ARJ will automatically handle the volumes past
ninety-nine and one hundred by changing the suffix to .100, .101,
.102, and so on.
New to ARJ is a simple delete option "D" when creating volume
archives. For SAFETY REASONS, this delete option is limited in
scope and specification. The exact file or files (via wildcard)
must be specified. A directory name is not sufficient (A:\ or
C:\TEMP). A filename or wildspec is required (A:\*.* or
C:\TEMP\*.TXT). In addition, this delete option does not delete
through (recurse) subdirectories. In other words, this delete
function works similar to the DOS DEL command except that a
filespec is required. ARJ accepts all characters after the "D"
option as the filespec.
Examples: ARJ a a:archive -vada:\*.*
ARJ a testvol -v1440dtestvol.a*
"-h#" switch
This feature has been modified to use only the last two digits of
the year. So the year 2010 will be represented by "10". This
will still provide "uniqueness" for filename generation. Daily
created archives will not collide name-wise for 100 years.
"-hb" switch
This switch is used to select by file attribute or file type.
The "-hb" option can be used to select files by their attributes
(normal, readonly, hidden, system, directory, and archive bit).
"Normal" is defined as files that are NOT the following: readonly,
hidden, system, label, chapter header, or directory. For
extract/list operations, you can also select chapter labels and
volume labels. By default, the "-hb" option by itself selects all
types of files. If you specify a letter symbol representing a file
type, you are selecting ONLY that type of file. You can specify a
series of letters representing all of the file types that you want
to select. For example, the "-hbdr" option selects both
directories and readonly files. Selections are additive.
Example: -hbnr select only normal and readonly files
Single letters represent each attribute or type.
a - archive bit set
b - archive bit clear
h - hidden
r - readonly
s - system
d - directory
n - normal files (not d, h, r, s, l, c)
l - volume label
c - chapter label
f - abbreviation for "ndhrs"
w - Windows long filenames
The archive bit selection ("a" or "b") is a special case. If you
have selected no types of files EXCEPT files with the archive bit
set, ARJ will select from the set of all file types. If you have
selected one or more file types, ARJ will select based upon the
archive bit from the selected set of files types.
Examples: -hbhrsa select hidden, readonly files with archive
bit set
-hba select all files with archive bit set
Add/update options : f, d, r, h, s, n, a, b.
Extract/list options: f, d, r, h, s, n, a, b, c, l, w.
Examples: ARJ a archive *.* -r -hbrs select only readonly
and system files
ARJ a archive *.* -r -hbd store only directories
ARJ l archive *.* -hbr list only readonly files
ARJ l archive -jb* -hbc list chapter headers
Notes: The option "-hb" with no letter options is an abbreviation
for "-hbndhrslc" (all types).
"-hf3" switch
When building a dual-name archive, ARJ will now check for files that
have long filenames inaccessible through MS-DOS. These are
filenames that contain symbols that WIN9x/MS-DOS translates into the
underscore "_" symbol. ARJ will display the "Can't open ..." error
message for each such file encountered.
"-hf4" switch
This switch sets ARJ to label all files archived under Windows
as Windows long filenames.
"-hg" switch
This switch is used to specify the filename of the encryption
module to be used when encrypting a new archive. The default
filename is "ARJCRYPT.COM". ARJCRYPT.COM contains a new
encryption scheme that is partly incompatible with earlier
releases of ARJ. This new scheme will accept passwords up to 64
characters. The old scheme accepted only the first 32 characters
of a password. As long as your passwords are 32 characters or
less, your archives will be compatible with ARJ 2.60 encryption.
ARJ will look for the encryption module in the directory that
contains the copy ARJ.EXE that is being executed unless the
specified module name contains a path symbol "\" as in
"ARJ\OLDCRYPT.COM". If you want to use a module in the current
directory, you should specify the name as in ".\ARJCRYPT.COM".
The "." indicates the current directory.
With an existing archive, ARJ detects the encryption scheme that
was used to encrypt the archive and uses the same scheme
regardless of whether the "-hg" option is specified or not.
However, if you encrypted with a non-default ARJCRYPT.COM, you
must specify the pathname with the "-hg" option.
This encryption module is available on the ARJ website for USA
users only.
"-hg!" switch
This switch is used to specify the use of a built-in 40 bit
version of the Russian GOST encryption algorithm. This algorithm
is limited to a 40 bit key to meet USA encryption export rules.
Any password input to this function will be crunched down to a
40 bit size. Only the first 32 characters of the password will
be accepted.
"-hk" switch
The "-hk" switch sets ARJ to create ARJ-PROTECT damage protection
data which is appended to the archive. This ARJ-PROTECT data
contains necessary information to repair damage to the protected
archive. The "-hk1", "-hk2" .... "-hk9" options will generate
more ARJ-PROTECT data affording a higher probability of a
successful repair at the cost of a larger archive.
This protection feature is sector based and allows repair due to
typical types of disk corruption (bad sector, virus damage, cross
links, etc). This type of sector protection is NOT effective for
most data transmission problems where data is missing from the
middle of a transmission.
If an archive already exists, the archive can be ARJ-PROTECTED
via the "t" command. If the archive is already protected, ARJ
will not protect it again.
Example: ARJ t archive -hk appends ARJ-PROTECT data
Repair of a damaged ARJ-PROTECTED archive is done with the "Q"
command. The repaired archive is named ARJFIXED.ARJ. The original
damaged archive is not modified. In addition, ARJFIXED.ARJ is
newly ARJ-PROTECTED.
Example: ARJ q docs repairs archive
For older style ARJ-PROTECTED archives (with accompanying .XRJ
file), you must specify the "-hk" option along with the "q"
command.
Example: ARJ q docs -hk repairs archive
Once an archive has been ARJ-PROTECTED, future archive updates
will automatically include ARJ-PROTECTION. That feature can be
disabled with the "y" command.
Example: ARJ y docs -hk
"-hm" switch
At ARJ 2.62c and up, ARJ will by default set -hm3000. This means
that if you are archiving over 3000 filenames, ARJ will use a disk
file to manage the list of filenames.
"-hq1" switch
This switch sets ARJ to ignore the error that occurs when ARJ
cannot open a file because it cannot be found during an add-type
command and/or a compare command. This is DOS error code 2.
This option applies only to files being added to a new archive
and/or being compared. For an existing archive, this option
will be ignored during the add operation, but NOT during a
subsequent compare operation.
This open error typically happens when a temporary file that ARJ
has found to archive is purged by another process before ARJ can
actually open and compress/compare it. This is not the same
error as when a user specifies a filename on the command line
and ARJ cannot find it.
This error also occurs in Windows 9x when trying to archive
files with filenames that contain "unusual" symbols. These are
the symbols that have no equivalent in MS-DOS. MS-DOS displays
those symbols as "_" underscore.
If you use the "-ji" option to set up an index file, ARJ will
log any file that it cannot open.
"-hy" switch
This switch will set ARJ to allow the extraction of ARJ32 created
archives containing ANSI codepage filenames. ARJ for DOS always
uses the OEM codepage which may translate ANSI codepage filenames
incorrectly or not at all. Filenames containing only alphanumeric
characters and the DOT symbol should be translated correctly.
The default for ARJ32 is the OEM codepage.
"-j#2" switch
This switch will set ARJ to restore the file attributes to the
selected files. No file will be extracted. Archives created
with the "-j#" and "-j#1" options can be used.
"-j#3" switch
This switch will set ARJ to restore the file dates (written,
accessed, created) to the selected files. No file will be
extracted.
"-j#4" switch
This switch will set ARJ to restore the file attributes and the
file dates (written, accessed, created) to the selected files. No
file will be extracted.
"-j$" switch
This switch will set ARJ to NOT save the file properties date-time
accessed and date-time created. This will save header size and
result in a slightly smaller archive. During extraction, this
switch will set ARJ to NOT restore the file properties date-time
accessed and date-time created.
"-ji" switch
ARJ will now log extraction errors to the index file.
"-jo1" switch
This switch will set ARJ on extraction to generate unique output
filenames AND keep the current file extension.
Example: NOTE.TXT will generate NOTE.001.TXT and so on.
"-jt" switch
"-jt1" switch
In DOS and Windows 9x when using removable media (diskettes), ARJ
will flush and invalidate cached diskette data from memory, so
that testing is done on the actual data on the diskette. A side
effect of this improvement in reliability is longer diskette
testing times.
Missing directories will now be reported as errors.
"-jt3" switch
This switch allows one to do a quick compare of files within an
archive and on disk. ARJ will only compare the date-time stamps
and the size of the files.
Example: ARJ t archive -jt3
There is a limitation in that multiple volume archives will generate
(size) errors for the files split over volumes.
end document