# $File: cad,v 1.31 2022/12/09 15:36:23 christos Exp $

#------------------------------------------------------------------------------
# $File: cad,v 1.31 2022/12/09 15:36:23 christos Exp $
# autocad: file(1) magic for cad files
#

# Microstation DGN/CIT Files (www.bentley.com)
# Last updated July 29, 2005 by Lester Hightower
# DGN is the default file extension of Microstation/Intergraph CAD files.
# CIT is the proprietary raster format (similar to TIFF) used to attach
# raster underlays to Microstation DGN (vector) drawings.
#
# http://www.wotsit.org/search.asp
# https://filext.com/detaillist.php?extdetail=DGN
# https://filext.com/detaillist.php?extdetail=CIT
#
# https://www.bentley.com/products/default.cfm?objectid=97F351F5-9C35-4E5E-89C2
# 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
#
# 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 library 2FEh~DGN 9FEh,DFEh~CIT
#>2 uleshort x \b, words %#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 %#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 %#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 %#4.4x
# class 0~Primary
#>>>>>32 uleshort&0x000F !0 \b, class %#4.4x
# Symbology
#>>>>>34 uleshort x \b, Symbology %#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 %#x
# RotationAngle; Rotation angle of raster data
#>196 ubequad !0 \b, RotationAngle %#llx
# SkewAngle; Skew angle of raster data
#>204 ubequad !0 \b, SkewAngle %llx
# DataTypeModifier; Additional raster data format info
#>212 uleshort !0 \b, DataTypeModifier %#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 %#llx
# MaxValue
#>500 ubequad !0 \b, MaxValue %#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
# and https://www.iana.org/assignments/media-types/image/vnd.dwg
0 string MC0.0 DWG AutoDesk AutoCAD Release 1.0
!:mime image/vnd.dwg
0 string AC1.2 DWG AutoDesk AutoCAD Release 1.2
!:mime image/vnd.dwg
0 string AC1.3 DWG AutoDesk AutoCAD Release 1.3
!:mime image/vnd.dwg
0 string AC1.40 DWG AutoDesk AutoCAD Release 1.40
!:mime image/vnd.dwg
0 string AC1.50 DWG AutoDesk AutoCAD Release 2.05
!:mime image/vnd.dwg
0 string AC2.10 DWG AutoDesk AutoCAD Release 2.10
!:mime image/vnd.dwg
0 string AC2.21 DWG AutoDesk AutoCAD Release 2.21
!:mime image/vnd.dwg
0 string AC2.22 DWG AutoDesk AutoCAD Release 2.22
!:mime image/vnd.dwg
0 string AC1001 DWG AutoDesk AutoCAD Release 2.22
!:mime image/vnd.dwg
0 string AC1002 DWG AutoDesk AutoCAD Release 2.50
!:mime image/vnd.dwg
0 string AC1003 DWG AutoDesk AutoCAD Release 2.60
!:mime image/vnd.dwg
0 string AC1004 DWG AutoDesk AutoCAD Release 9
!:mime image/vnd.dwg
0 string AC1006 DWG AutoDesk AutoCAD Release 10
!:mime image/vnd.dwg
0 string AC1009 DWG AutoDesk AutoCAD Release 11/12
!:mime image/vnd.dwg
# AutoCAD DWG versions R13/R14 (www.autodesk.com)
# Written December 01, 2003 by Lester Hightower
# Based on the DWG File Format Specifications at http://www.opendwg.org/
# AutoCad, from Nahuel Greco
# AutoCAD DWG versions R12/R13/R14 (www.autodesk.com)
0 string AC1012 DWG AutoDesk AutoCAD Release 13
!:mime image/vnd.dwg
0 string AC1013 DWG AutoDesk AutoCAD Release 13c3
!:mime image/vnd.dwg
0 string AC1014 DWG AutoDesk AutoCAD Release 14
!:mime image/vnd.dwg
0 string AC1015 DWG AutoDesk AutoCAD 2000
!:mime image/vnd.dwg

# A new version of AutoCAD DWG
# Sergey Zaykov ([email protected], [email protected],
# ICQ 358572321)
# From various sources like:
# https://autodesk.blogs.com/between_the_lines/autocad-release-history.html
0 string AC1018 DWG AutoDesk AutoCAD 2004/2005/2006
!:mime image/vnd.dwg
0 string AC1021 DWG AutoDesk AutoCAD 2007/2008/2009
!:mime image/vnd.dwg
0 string AC1024 DWG AutoDesk AutoCAD 2010/2011/2012
!:mime image/vnd.dwg
0 string AC1027 DWG AutoDesk AutoCAD 2013-2017
!:mime image/vnd.dwg

# From GNU LibreDWG
0 string AC1032 DWG AutoDesk AutoCAD 2018/2019/2020
!:mime image/vnd.dwg
0 string AC1035 DWG AutoDesk AutoCAD 2021
!:mime image/vnd.dwg

# KOMPAS 2D drawing from ASCON
# This is KOMPAS 2D drawing or fragment of drawing but is not detailed nor
# gathered nor specification
# ASCON https://ascon.net/main/ in English,
# https://ascon.ru/ main site in Russian
# Extension is CDW for drawing and FRW for fragment of drawing
# Sergey Zaykov ([email protected], [email protected],
# ICQ 358572321, https://vkontakte.ru/id16076543)
# From:
# https://sd.ascon.ru/otrs/customer.pl?Action=CustomerFAQ&CategoryID=4&ItemID=292
# (in russian) and my experiments
0 string KF
>2 belong 0x4E00000C Kompas drawing 12.0 SP1
>2 belong 0x4D00000C Kompas drawing 12.0
>2 belong 0x3200000B Kompas drawing 11.0 SP1
>2 belong 0x3100000B Kompas drawing 11.0
>2 belong 0x2310000A Kompas drawing 10.0 SP1
>2 belong 0x2110000A Kompas drawing 10.0
>2 belong 0x08000009 Kompas drawing 9.0 SP1
>2 belong 0x05000009 Kompas drawing 9.0
>2 belong 0x33010008 Kompas drawing 8+
>2 belong 0x1A000008 Kompas drawing 8.0
>2 belong 0x2C010107 Kompas drawing 7+
>2 belong 0x05000007 Kompas drawing 7.0
>2 belong 0x32000006 Kompas drawing 6+
>2 belong 0x09000006 Kompas drawing 6.0
>2 belong 0x5C009005 Kompas drawing 5.11R03
>2 belong 0x54009005 Kompas drawing 5.11R02
>2 belong 0x51009005 Kompas drawing 5.11R01
>2 belong 0x22009005 Kompas drawing 5.10R03
>2 belong 0x22009005 Kompas drawing 5.10R02 mar
>2 belong 0x21009005 Kompas drawing 5.10R02 febr
>2 belong 0x19009005 Kompas drawing 5.10R01
>2 belong 0xF4008005 Kompas drawing 5.9R01.003
>2 belong 0x1C008005 Kompas drawing 5.9R01.002
>2 belong 0x11008005 Kompas drawing 5.8R01.003

# CAD: file(1) magic for computer aided design files
# Phillip Griffith <phillip dot griffith at gmail dot com>
# AutoCAD magic taken from the Open Design Alliance's OpenDWG specifications.
#

# 3DS (3d Studio files)
0 leshort 0x4d4d
>6 leshort 0x2
>>8 lelong 0xa
>>>16 leshort 0x3d3d 3D Studio model
# Beat sgi MMV
!:strength +20
!:mime image/x-3ds
!:ext 3ds

# MegaCAD 2D/3D drawing (.prt)
# https://megacad.de/
# From: Markus Heidelberg <[email protected]>
0 string MegaCad23\0 MegaCAD 2D/3D drawing

# Hoops CAD files
# https://docs.techsoft3d.com/visualize/3df/latest/build/general/hsf/\
# HSF_architecture.html
# Stephane Charette <[email protected]>
0 string ;;\040HSF\040V OpenHSF (Hoops Stream Format)
>7 regex/9 V[.0-9]{4,5}\040 %s
!:ext hsf

# AutoCAD Drawing Exchange Format
# Update: Joerg Jenderek
# URL: http://fileformats.archiveteam.org/wiki/DXF
# https://en.wikipedia.org/wiki/AutoCAD_DXF
# Reference: http://mark0.net/download/triddefs_xml.7z/defs/d/
# dxf-var0.trid.xml dxf-var0u.trid.xml dxf-var2.trid.xml dxf-var2u.trid.xml
# Note: called "AutoCAD Drawing eXchange Format" by TrID and
# "Drawing Interchange File Format (ASCII)" by DROID
# GRR: some samples does not match 1st test like: abydos.dxf
0 regex \^[\ \t]*0\r?\000$
>1 regex \^[\ \t]*SECTION\r?$
>>2 regex \^[\ \t]*2\r?$
# GRR: some samples without HEADER section like: airplan2.dxf
>>>3 regex \^[\ \t]*HEADER\r?$ AutoCAD Drawing Exchange Format
#!:mime application/x-dxf
!:mime image/vnd.dxf
!:ext dxf
# DROID PUID fmt/64 fmt-64-signature-id-99.dxf
>>>>&1 search/8192 MC0.0 \b, 1.0
# DROID PUID fmt/65 fmt-65-signature-id-100.dxf
>>>>&1 search/8192 AC1.2 \b, 1.2
# DROID PUID fmt/66 fmt-66-signature-id-101.dxf
>>>>&1 search/8192 AC1.3 \b, 1.3
# DROID PUID fmt/67 fmt-67-signature-id-102.dxf
>>>>&1 search/8192 AC1.40 \b, 1.4
# DROID PUID fmt/68 fmt-68-signature-id-103.dxf
>>>>&1 search/8192 AC1.50 \b, 2.0
# DROID PUID fmt/69 fmt-69-signature-id-104.dxf
>>>>&1 search/8192 AC2.10 \b, 2.1
# DROID PUID fmt/70 fmt-70-signature-id-105.dxf
>>>>&1 search/8192 AC2.21 \b, 2.2
# DROID PUID fmt/71 fmt-71-signature-id-106.dxf
>>>>&1 search/8192 AC1002 \b, 2.5
# DROID PUID fmt/72 fmt-72-signature-id-107.dxf
>>>>&1 search/8192 AC1003 \b, 2.6
# DROID PUID fmt/73 fmt-73-signature-id-108.dxf
>>>>&1 search/8192 AC1004 \b, R9
>>>>&1 search/8192 AC1006 \b, R10
# http://cd.textfiles.com/amigaenv/DXF/OBJEKTE/LASTMINUTE/apple.dxf
#>>>>&1 search/8192 AC1008 \b, Rfoo
>>>>&1 search/8192 AC1009 \b, R11/R12
>>>>&1 search/8192 AC1012 \b, R13
>>>>&1 search/8192 AC1013 \b, R13c3
>>>>&1 search/8192 AC1014 \b, R14
>>>>&1 search/8192 AC1015 \b, version 2000
>>>>&1 search/8192 AC1018 \b, version 2004
>>>>&1 search/8192 AC1021 \b, version 2007
>>>>&1 search/8192 AC1024 \b, version 2010
>>>>&1 search/8192 AC1027 \b, version 2013
>>>>&1 search/8192 AC1032 \b, version 2018
>>>>&1 search/8192 AC1035 \b, version 2021

# The Sketchup 3D model format https://www.sketchup.com/
0 string \xff\xfe\xff\x0e\x53\x00\x6b\x00\x65\x00\x74\x00\x63\x00\x68\x00\x55\x00\x70\x00\x20\x00\x4d\x00\x6f\x00\x64\x00\x65\x00\x6c\x00 SketchUp Model
!:mime application/vnd.sketchup.skp
!:ext skp

4 regex/b P[0-9][0-9]\\.[0-9][0-9][0-9][0-9]\\.[0-9][0-9][0-9][0-9]\\.[0-9] NAXOS CAD System file from version %s
!:strength +40

# glTF (GL Transmission Format) - by the Khronos Group
# Reference: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#glb-file-format-specification
0 string glTF glTF binary model
>4 ulelong x \b, version %d
>8 ulelong x \b, length %d bytes
!:mime model/gltf-binary
!:ext glb

# FBX (FilmBoX) - by Kaydara/Autodesk
# Reference: https://code.blender.org/2013/08/fbx-binary-file-format-specification
0 string Kaydara\ FBX\ Binary\ \ \0 Kaydara FBX model,
>&2 ulelong x version %d
!:ext fbx

# PLY (Polygon File Format/Stanford Triangle Format) - by Greg Turk
# Reference: https://web.archive.org/web/20161204152348/http://www.dcs.ed.ac.uk/teaching/cs4/www/graphics/Web/ply.html
0 string ply\n PLY model,
!:ext ply
>4 string format\ ascii\ ASCII,
>>&0 regex/6 [0-9.]+ version %s
>4 string format\ binary binary,
>>&0 string _little_endian\ little endian,
>>>&0 regex/6 [0-9.]+ version %s
>>&0 string _big_endian\ big endian,
>>>&0 regex/6 [0-9.]+ version %s

# VRML (Virtual Reality Modeling Language) - by the Web3D Consortium
# From: Michel Briand <[email protected]>
# Reference: https://www.web3d.org/standards
0 string/w #VRML\ V1.0\ ascii VRML 1 file
!:mime model/vrml
!:ext wrl
0 string/w #VRML\ V2.0\ utf8 ISO/IEC 14772 VRML 97 file
!:mime model/vrml
!:ext wrl
# X3D, VRML encoded
0 string #X3D X3D (Extensible 3D) model, VRML format
>4 string V
>>5 regex/6 [0-9.]+ \b, version %s
!:mime model/x3d+vrml
!:ext x3dv

## XML-based 3D CAD Formats
# From: Michel Briand <[email protected]>, Oliver Galvin <[email protected]>
0 string/w \<?xml\ version=
!:strength + 5
# X3D (Extensible 3D)
# Schema: https://www.web3d.org/specifications/x3d-3.2.dtd
# MIME Type: https://www.iana.org/assignments/media-types/model/x3d+xml
# Example: https://www.web3d.org/x3d/content/examples/Basic/course/CreateX3DFromStringRandomSpheres.x3d
>20 search/1000/w \<!DOCTYPE\ X3D X3D (Extensible 3D) model, XML document
!:mime model/x3d+xml
!:ext x3d
# COLLADA (COLLAborative Design Activity) - by the Khronos Group
# Schema: http://www.collada.org/2005/11/COLLADASchema
# Reference: https://www.khronos.org/collada
>20 search/1000/w \<COLLADA COLLADA model, XML document
!:mime model/vnd.collada+xml
!:ext dae
# 3MF (3D Manufacturing Format) - by the 3MF Consortium
# Schema: http://schemas.microsoft.com/3dmanufacturing/core/2015/02
# Reference: https://3mf.io/specification
>20 search/1000/w xmlns="http://schemas.microsoft.com/3dmanufacturing 3MF (3D Manufacturing Format) model, XML document
!:mime model/3mf
!:ext 3mf
# AMF (Additive Manufacturing File)
# Reference: https://www.astm.org/Standards/ISOASTM52915.htm
>20 search/1000/w \<amf AMF (Additive Manufacturing Format) model, XML document
!:mime application/x-amf
!:ext amf