[File] [PATCH] Magdir/maple help database .hdb versus XBase index .cdx

Sun Aug 15 06:04:45 UTC 2021

On Aug 4,  2:04am, joerg.jen.der.ek at gmx.net (=?UTF-8?Q?J=c3=b6rg_Jenderek?=) wrote:
-- Subject: [File] [PATCH] Magdir/maple help database *.hdb versus XBase inde

Added, thanks!

christos

| This is a multi-part message in MIME format.
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| Hello,
| 
| some days ago i inspected some Maple examples. Now i looked at Maple
| help examples with hdb extension.
| 
| When running running file command version 5.40 on such examples and
| related files i get an output like:
| 
| algolib.hdb:  Maple help database
| exterior.hdb: Maple help database
| hsum.hdb:     Maple help database
| LieAlg.hdb:   Maple help database
| maple.hdb:    Maple help database
| CUSTREG.CDX:  Maple help database
| HIGHWAY.CDX:  Maple help database
| MailTo.CDX:   Maple help database
| PARCEL.CDX:   Maple help database
| Security.CDX: Maple help database
| 
| With --extension only ??? is displayed and with -i option
| application/octet-stream  is shown for examples.
| 
| For comparison reason i run the file format identification utility
| TrID ( See https://mark0.net/soft-trid-e.html).
| All HDB examples are described by TrID also as "Maple Help Database"
| by hdb-maple.trid.xml. The CDX examples, which are misidentified by
| file command, are described correctly as "Compound index MS Visual
| FoxPro 7" by cdx-vfp7.trid.xml or as "Sybase iAnywhere index files"
| by sybase-ianywhere-cdx.trid.xml (See appended hdb-trid-v.txt.gz ).
| 
| The detection of examples happens by lines inside Magdir/maple like:
| 0	string	\000\004\000\000	Maple help database
| 
| So 4 bytes are used for detection, but that low value with 3 null
| bytes is obviously not very unique enough. That pattern is also true
| for many xBASE Compound Index files (*.CDX).
| 
| Unfortunately i found no file format specification. At least on
| software producer page maplesoft i found a short page about the HDB
| files. So at least i used the information of TrID database for
| further information. That is expressed by additional comment lines likes
| # URL:	https://www.maplesoft.com/support/help/maple/view.aspx?
| # path=3DFormats/HDB
| # Ref.:	https://mark0.net/download/triddefs_xml.7z
| #       /defs/h/hdb-maple.trid.xml
| 
| According to TrID definition the HDB examples contain string
| sequences like "Maple Input" and "Maple Output". This should be
| unique enough to distinguish HDB from CDX examples. Unfortunately
| these sequence can occur at "very high" offsets. So i look for
| another test. In many example at fixed 1k range i found keyword
| version. So i use this as first test and if this not possible then i
| look for Maple keyword. So the magic lines now becomes like:
|   0	string	\000\004\000\000
|   >1028	string	version			Maple help database
|   !:mime application/x-maple-hdb
|   !:ext	hdb
|   >1028	default	x
|   >>4		search/0xCC41	Maple	KEY_Maple help database
|   !:mime application/x-maple-hdb
|   !:ext	hdb
| Furthermore instead of generic mime typ application/octet-stream a
| use defined one is shown.
| 
| After applying the above mentioned modifications by patch
| file-5.40-maple-hdb.diff then all HDB examples are still recognized
| and misidentifications of CDX examples vanished like:
| 
| algolib.hdb:  Maple help database
| exterior.hdb: Maple help database
| hsum.hdb:     Maple help database
| LieAlg.hdb:   Maple help database
| maple.hdb:    Maple help database
| CUSTREG.CDX:  data
| HIGHWAY.CDX:  data
| MailTo.CDX:   data
| PARCEL.CDX:   data
| Security.CDX: data
| 
| I hope my diff file can be applied in future version of file utility.
| 
| I will try to create magic lines for CDX examples in a future session.
| 
| With best wishes
| J=C3=B6rg Jenderek
| =2D-
| J=C3=B6rg Jenderek
| 
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| 
| -- 
| File mailing list
| File at astron.com
| https://mailman.astron.com/mailman/listinfo/file
| 
| --------------E7A1B5A9770BDBCA1F8026CA
| Content-Type: text/sanitizer-log; charset="iso-8859-1"
| Content-Transfer-Encoding: 8bit
| Content-Disposition: attachment; filename="sanitizer.log"
| 
| This message has been 'sanitized'.  This means that potentially
| dangerous content has been rewritten or removed.  The following
| log describes which actions were taken.
| 
| Sanitizer (start="1628035487"):
|   Part (pos="4581"):
|     SanitizeFile (filename="unnamed.txt", mimetype="text/plain"):
|       Match (names="unnamed.txt", rule="9"):
|         Enforced policy: accept
| 
|   Part (pos="8026"):
|     SanitizeFile (filename="file-5.40-maple-hdb.diff", mimetype="text/plain"):
|       Match (rule="default"):
|         Enforced policy: defang
| 
|       Replaced mime type with: application/DEFANGED-342
|       Replaced file name with: file-5_40-maple-hdb_diff.DEFANGED-342
| 
|   Part (pos="9546"):
|     SanitizeFile (filename="file-5.40-maple-hdb.diff.sig", mimetype="application/octet-stream"):
|       Match (rule="default"):
|         Enforced policy: defang
| 
|       Replaced mime type with: application/DEFANGED-343
|       Replaced file name with: file-5_40-maple-hdb_diff_sig.DEFANGED-343
| 
|   Part (pos="10708"):
|     SanitizeFile (filename="hdb-trid-v.txt.gz", mimetype="application/x-gzip"):
|       Match (names="hdb-trid-v.txt.gz", rule="9"):
|         Enforced policy: accept
| 
|   Part (pos="12540"):
|     SanitizeFile (filename="unnamed.txt", mimetype="text/plain"):
|       Match (names="unnamed.txt", rule="9"):
|         Enforced policy: accept
| 
|   Total modifications so far: 2
| 
| 
| Anomy 0.0.0 : Sanitizer.pm
| $Id: Sanitizer.pm,v 1.94 2006/01/02 16:43:10 bre Exp $
| 
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-- End of excerpt from =?UTF-8?Q?J=c3=b6rg_Jenderek?=

[File] [PATCH] Magdir/maple help database *.hdb versus XBase index *.cdx

[File] [PATCH] Magdir/maple help database .hdb versus XBase index .cdx