#------------------------------------------------------------------------------
-# $File: cad,v 1.19 2019/04/19 00:42:27 christos Exp $
+# $File: cad,v 1.20 2019/08/10 13:34:17 christos Exp $
# autocad: file(1) magic for cad files
#
# 3F86C928&method=display&p_objectid=97F351F5-9C35-4E5E-89C280A93F86C928
# https://www.bentley.com/products/default.cfm?objectid=A5C2FD43-3AC9-4C71-B682
# 721C479F&method=display&p_objectid=A5C2FD43-3AC9-4C71-B682C7BE721C479F
-0 string \010\011\376 Microstation
->3 string \002
->>30 string \026\105 DGNFile
->>30 string \034\105 DGNFile
->>30 string \073\107 DGNFile
->>30 string \073\110 DGNFile
->>30 string \106\107 DGNFile
->>30 string \110\103 DGNFile
->>30 string \120\104 DGNFile
->>30 string \172\104 DGNFile
->>30 string \172\105 DGNFile
->>30 string \172\106 DGNFile
->>30 string \234\106 DGNFile
->>30 string \273\105 DGNFile
->>30 string \306\106 DGNFile
->>30 string \310\104 DGNFile
->>30 string \341\104 DGNFile
->>30 string \372\103 DGNFile
->>30 string \372\104 DGNFile
->>30 string \372\106 DGNFile
->>30 string \376\103 DGNFile
->4 string \030\000\000 CITFile
->4 string \030\000\003 CITFile
+#
+# URL: https://en.wikipedia.org/wiki/MicroStation
+# reference: http://dgnlib.maptools.org/dgn.html
+# http://dgnlib.maptools.org/dl/ref18.pdf
+# Update: Joerg Jenderek
+# Note: verfied by command like `dgndump seed2d_b.dgn`
+# test for level 8 and type 5 or 9
+0 beshort&0x3F73 0x0801
+# level of element like 8
+#>0 ubyte&0x3F x \b, level %u
+#>0 ubyte &0x80 \b, complex
+#>0 ubyte &0x40 \b, reserved
+# type of element 9~TCB 8~Digitizer setup 5~Group Data Elements
+#>1 ubyte&0x7F x \b, type %u
+# words to follow in element: 17H~CEL libray 2FEh~DGN 9FEh,DFEh~CIT
+#>2 uleshort x \b, words 0x%4.4x to follow
+# test for 3 reserved 0 bytes in CIT or "conversion" in ViewInfo structure (DGN CEL)
+#>508 ubelong x \b, RESERVED %8.8x
+>508 ubelong&0xFFffFF00 =0
+# test for level 8 and type 9 for INGR raster image
+>>0 beshort 0x0809
+# test for length of 1st element is multiple of blocks a 512 bytes
+>>>2 ubyte 0xfe
+>>>>0 use ingr-image
+# test for DGN or CEL by jump words (uleshort) forward to next element
+>(2.s*2) ulong x
+# 2nd element type: 8~Digitizer~DesiGNfile 1~library cell header other~CIT
+#>>&1 ubyte&0x7F x \b, 2nd type %u
+# DGN
+>>&1 ubyte&0x7F 8
+>>>2 uleshort =0x02FE Bentley/Intergraph Microstation CAD drawing
+!:mime application/x-bentley-dgn
+!:ext dgn
+# The 0x40 bit of this byte is 1 if the file is 3D, otherwise 0
+>>>>1214 ubyte &0x40 3D
+>>>>1214 ubyte ^0x40 2D
+# 2 chars for name of subunits like ft FT in IN mu m mm '\0 '\040
+>>>>1120 string x \b, units %-.2s
+# 2 chars for name of master unit like IN in ML SU tn th TH HU mm "\0 "\040 \0\0
+>>>>1122 string >\0 %-.2s
+#>>>>1120 ubelong x \b, units 0x%8.8x
+# element range low,high x y z like xlow=0 08010000h 01080000h
+#>>>>4 ubelong !0 \b, xlow %8.8x
+#>>>>8 ubelong !0 \b, ylow %8.8x
+#>>>>12 ubelong !0 \b, zlow %8.8x
+#>>>>16 ubelong !0 \b, xhigh %8.8x
+#>>>>20 ubelong !0 \b, yhigh %8.8x
+#>>>>24 ubelong !0 \b, zhigh %8.8x
+# graphic group number; all other elements in that group have same non-0 number
+#>>>>28 leshort x \b, grphgrp 0x%4.4x
+# words to optional attribute linkage
+#>>>>30 ubyte x \b, attindx \%o
+#>>>>31 ubyte x \b\%o
+# >>30 string \026\105 DGNFile
+# >>30 string \034\105 DGNFile
+# >>30 string \073\107 DGNFile
+# >>30 string \073\110 DGNFile
+# >>30 string \106\107 DGNFile
+# >>30 string \110\103 DGNFile
+# >>30 string \120\104 DGNFile
+# >>30 string \172\104 DGNFile
+# >>30 string \172\105 DGNFile
+# >>30 string \172\106 DGNFile
+# >>30 string \234\106 DGNFile
+# >>30 string \273\105 DGNFile
+# >>30 string \306\106 DGNFile
+# >>30 string \310\104 DGNFile
+# >>30 string \341\104 DGNFile
+# >>30 string \372\103 DGNFile
+# >>30 string \372\104 DGNFile
+# >>30 string \372\106 DGNFile
+# >>30 string \376\103 DGNFile
+# elements properties indicator
+#>>>>32 uleshort !0 \b, properties 0x%4.4x
+# class 0~Primary
+#>>>>>32 uleshort&0x000F !0 \b, class 0x%4.4x
+# Symbology
+#>>>>>34 uleshort x \b, Symbology 0x%4.4x
+# test for 2nd element type 1~library cell header
+>>&1 ubyte&0x7F 1
+# test for 1st element with level 8 and type 5 for cell library
+>>>0 beshort 0x0805 Bentley/Intergraph Microstation CAD cell library
+!:mime application/x-bentley-cel
+!:ext cel
+#
+# URL: http://fileformats.archiveteam.org/wiki/Intergraph_Raster
+# reference: https://web.archive.org/web/20140903185431/
+# http://oreilly.com/www/centers/gff/formats/ingr/index.htm
+# note: verfied by command like `nconvert -fullinfo LONGLAT.CIT`
+# display information for intergraph raster bitmap
+0 name ingr-image
+# in 5.37 "Microstation CITFile" "Bentley/Intergraph MicroStation CIT raster CAD"
+# DataTypeCode indicates format, depth of the pixel data and used compression
+>4 uleshort x Intergraph raster image
+>>4 uleshort 0x0009 \b, Run-Length Encoded 1-bit
+!:mime image/x-intergraph-rle
+!:ext rel
+>>4 uleshort 0x0018 \b, CCITT Group 4 1-bit
+!:mime image/x-intergraph-cit
+!:ext cit
+>>4 uleshort 27 \b, Adaptive RLE RGB
+!:mime image/x-intergraph-rgb
+!:ext rgb
+>>4 default x
+>>>4 uleshort x \b, Type %u
+!:mime image/x-intergraph
+# TODO:
+#>4 uleshort 0 \b, no data
+# ...
+#>4 uleshort 0x0045 \b, Continuous Tone CMKY (Uncompressed)
+# ApplicationType: 0~generic raster image 3~drawing, scanning
+# 8~I/IMAGE and MicroStation Imager 9~ModelView
+>6 uleshort !0 \b, ApplicationType %u
+#>6 uleshort x \b, ApplicationType %u
+# XViewOrigin; Raster grid data X origin
+#>8 ulequad !0 \b, XViewOrigin %llx
+# PixelsPerLine is the number of pixels in a scan line of bitmapp
+>184 ulelong x \b, %u x
+# NumberOfLines is height of the raster data in scanlines
+>188 ulelong x %u
+# DeviceResolution; resolution of scanning device
+# positive indicates number of micros between lines; negative indicates DPI
+#>192 leshort x \b, DeviceResolution %d
+# ScanlineOrient indicates the origin and the orientation of the scan lines
+#>194 ubyte x \b, ScanlineOrient %x
+>194 ubyte x \b, orientation
+>194 ubyte &0x01 right
+>194 ubyte ^0x01 left
+>194 ubyte &0x02 down
+>194 ubyte ^0x02 top
+>194 ubyte &0x04 horizontal
+>194 ubyte ^0x04 vertical
+# ScannableFlag; Scanline indexing method used
+#>195 ubyte !0 \b, ScannableFlag 0x%x
+# RotationAngle; Rotation angle of raster data
+#>196 ubequad !0 \b, RotationAngle 0x%llx
+# SkewAngle; Skew angle of raster data
+#>204 ubequad !0 \b, SkewAngle %llx
+# DataTypeModifier; Additional raster data format info
+#>212 uleshort !0 \b, DataTypeModifier 0x%4.4x
+# DesignFile[66]; Name of the design file
+>214 string >\0 \b, DesignFile %-.66s
+# DatabaseFile[66]; Name of the database file
+>280 string >\0 \b, DatabaseFile %-.66s
+# ParentGridFile[66]; Name of parent grid file
+>346 string >\0 \b, ParentGridFile %-.66s
+# FileDescription[80]; Text description of file and contents
+>412 string >\0 \b, FileDescription %-.80s
+# MinValue
+#>492 ubequad !0 \b, MinValue 0x%llx
+# MaxValue
+#>500 ubequad !0 \b, MaxValue 0x%llx
+# Reserved[3]; Unused (always 0)
+#>508 ubelong&0xFFffFF00 x \b, RESERVED %8.8x
+# GridFileVersion; Grid File Version like 2 3
+#>511 ubyte x \b, GridFileVersion %x
# AutoCAD
# Merge of the different contributions and updates from https://en.wikipedia.org/wiki/Dwg
# Phillip Griffith <phillip dot griffith at gmail dot com>
# AutoCAD magic taken from the Open Design Alliance's OpenDWG specifications.
#
-0 belong 0x08051700 Bentley/Intergraph MicroStation DGN cell library
-0 belong 0x0809fe02 Bentley/Intergraph MicroStation DGN vector CAD
-0 belong 0xc809fe02 Bentley/Intergraph MicroStation DGN vector CAD
-0 beshort 0x0809 Bentley/Intergraph MicroStation
->0x02 byte 0xfe
->>0x04 beshort 0x1800 CIT raster CAD
# 3DS (3d Studio files)
0 leshort 0x4d4d
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