Add STEP 3D model mime-type

Add mime-type for STEP 3D models as per Wikipedia page:
https://en.wikipedia.org/wiki/ISO_10303-21

Note that this doesn't include support for STEP-XML files
(https://en.wikipedia.org/wiki/ISO_10303-28) as it's a separate
filetype.

STEP+ZIP was ommitted because of the lack of information and examples
about the format.

3 files changed, 185 insertions, 0 deletions

diff --git a/data/freedesktop.org.xml.in b/data/freedesktop.org.xml.in
index c24b80e..560675d 100644
--- a/data/freedesktop.org.xml.in
+++ b/data/freedesktop.org.xml.in
@@ -8316,6 +8316,16 @@ command to generate the output files.
     <alias type="model/x.stl-binary"/>
   </mime-type>
 
+  <mime-type type="model/step">
+    <comment>STEP 3D model</comment>
+    <generic-icon name="image-x-generic"/>
+    <glob pattern="*.step"/>
+    <glob pattern="*.stp"/>
+    <magic>
+      <match type="string" value="ISO-10303-21;" offset="0"/>
+    </magic>
+  </mime-type>
+
   <mime-type type="text/x.gcode">
     <comment>G-code file</comment>
     <sub-class-of type="text/plain"/>
diff --git a/tests/mime-detection/list b/tests/mime-detection/list
index 4bd203c..2794f78 100644
--- a/tests/mime-detection/list
+++ b/tests/mime-detection/list
@@ -957,6 +957,8 @@ dbus-comment.service text/x-dbus-service
 cube.3mf model/3mf ox
 binary.stl model/stl oxo
 ascii.stl model/stl
+# from https://www.nist.gov/document/nist-ftc-test-case-definitions
+nist_ftc_11_asme1_rb.stp model/step
 test.gcode text/x.gcode ox
 20mm_Box.gx text/x-gcode-gx
 # Converted from binary.stl with Blender
diff --git a/tests/mime-detection/nist_ftc_11_asme1_rb.stp b/tests/mime-detection/nist_ftc_11_asme1_rb.stp
new file mode 100644
index 0000000..7bc60d3
--- /dev/null
+++ b/tests/mime-detection/nist_ftc_11_asme1_rb.stp
@@ -0,0 +1,173 @@
+ISO-10303-21;

+HEADER;

+FILE_DESCRIPTION(('FTC-11 geometry only from the NIST MBE PMI Validation and Conformance Testing Project - go.usa.gov/mGVm'),'2;1');

+FILE_NAME('nist_ftc_11_asme1.stp','2015-05-27T17:43:57',(''),(''),'','','');

+FILE_SCHEMA(('CONFIG_CONTROL_DESIGN'));

+ENDSEC;

+DATA;

+#5=APPLICATION_CONTEXT('configuration controlled 3D designs of mechanical parts and assemblies');

+#6=APPLICATION_PROTOCOL_DEFINITION('International Standard','ap203_configuration_controlled_3d_design_of_mechanical_parts_and_assemblies_mim_lf',2004,#5);

+#7=PRODUCT_CONTEXT('',#5,'mechanical');

+#8=PRODUCT('nist_ftc_11_asme1','nist_ftc_11_asme1',$,(#7));

+#9=PRODUCT_RELATED_PRODUCT_CATEGORY('part',$,(#8));

+#10=PRODUCT_DEFINITION_FORMATION('',$,#8);

+#11=PRODUCT_DEFINITION_CONTEXT('part definition',#5,'design');

+#12=PRODUCT_DEFINITION('',$,#10,#11);

+#18=(NAMED_UNIT(*)PLANE_ANGLE_UNIT()SI_UNIT($,.RADIAN.));

+#19=DIMENSIONAL_EXPONENTS(0.0,0.0,0.0,0.0,0.0,0.0,0.0);

+#20=PLANE_ANGLE_MEASURE_WITH_UNIT(PLANE_ANGLE_MEASURE(0.0174532925),#18);

+#24=(CONVERSION_BASED_UNIT('DEGREE',#20)NAMED_UNIT(#19)PLANE_ANGLE_UNIT());

+#28=(NAMED_UNIT(*)SI_UNIT($,.STERADIAN.)SOLID_ANGLE_UNIT());

+#32=(LENGTH_UNIT()NAMED_UNIT(*)SI_UNIT(.MILLI.,.METRE.));

+#34=UNCERTAINTY_MEASURE_WITH_UNIT(LENGTH_MEASURE(0.01),#32,'DISTANCE_ACCURACY_VALUE','');

+#36=(GEOMETRIC_REPRESENTATION_CONTEXT(3)GLOBAL_UNCERTAINTY_ASSIGNED_CONTEXT((#34))GLOBAL_UNIT_ASSIGNED_CONTEXT((#24,#28,#32))REPRESENTATION_CONTEXT('None','None'));

+#37=AXIS2_PLACEMENT_3D('',#38,#39,#40);

+#38=CARTESIAN_POINT('',(0.0,0.0,0.0));

+#39=DIRECTION('',(0.0,0.0,1.0));

+#40=DIRECTION('',(1.0,0.0,0.0));

+#41=SHAPE_REPRESENTATION('',(#37),#36);

+#42=PRODUCT_DEFINITION_SHAPE('','',#12);

+#43=SHAPE_DEFINITION_REPRESENTATION(#42,#41);

+#49=(NAMED_UNIT(*)PLANE_ANGLE_UNIT()SI_UNIT($,.RADIAN.));

+#50=DIMENSIONAL_EXPONENTS(0.0,0.0,0.0,0.0,0.0,0.0,0.0);

+#51=PLANE_ANGLE_MEASURE_WITH_UNIT(PLANE_ANGLE_MEASURE(0.0174532925),#49);

+#55=(CONVERSION_BASED_UNIT('DEGREE',#51)NAMED_UNIT(#50)PLANE_ANGLE_UNIT());

+#59=(NAMED_UNIT(*)SI_UNIT($,.STERADIAN.)SOLID_ANGLE_UNIT());

+#63=(LENGTH_UNIT()NAMED_UNIT(*)SI_UNIT(.MILLI.,.METRE.));

+#65=UNCERTAINTY_MEASURE_WITH_UNIT(LENGTH_MEASURE(0.000001),#63,'DISTANCE_ACCURACY_VALUE','');

+#67=(GEOMETRIC_REPRESENTATION_CONTEXT(3)GLOBAL_UNCERTAINTY_ASSIGNED_CONTEXT((#65))GLOBAL_UNIT_ASSIGNED_CONTEXT((#55,#59,#63))REPRESENTATION_CONTEXT('','3D'));

+#68=CARTESIAN_POINT('',(0.0,0.0,-0.75));

+#69=DIRECTION('',(0.0,0.0,1.0));

+#70=DIRECTION('',(0.0,-1.0,0.0));

+#71=AXIS2_PLACEMENT_3D('',#68,#69,#70);

+#72=CYLINDRICAL_SURFACE('',#71,16.0);

+#73=CARTESIAN_POINT('',(0.0,-16.0,-1.499999999999999));

+#74=VERTEX_POINT('',#73);

+#75=CARTESIAN_POINT('',(0.0,0.0,-1.499999999999999));

+#76=DIRECTION('',(0.0,0.0,1.0));

+#77=DIRECTION('',(0.0,-1.0,0.0));

+#78=AXIS2_PLACEMENT_3D('',#75,#76,#77);

+#79=CIRCLE('',#78,16.0);

+#80=EDGE_CURVE('',#74,#74,#79,.T.);

+#81=ORIENTED_EDGE('',*,*,#80,.F.);

+#82=EDGE_LOOP('',(#81));

+#83=FACE_OUTER_BOUND('',#82,.T.);

+#84=CARTESIAN_POINT('',(0.0,-16.0,0.0));

+#85=VERTEX_POINT('',#84);

+#86=CARTESIAN_POINT('',(0.0,0.0,0.0));

+#87=DIRECTION('',(0.0,0.0,1.0));

+#88=DIRECTION('',(0.0,-1.0,0.0));

+#89=AXIS2_PLACEMENT_3D('',#86,#87,#88);

+#90=CIRCLE('',#89,16.0);

+#91=EDGE_CURVE('',#85,#85,#90,.T.);

+#92=ORIENTED_EDGE('',*,*,#91,.T.);

+#93=EDGE_LOOP('',(#92));

+#94=FACE_BOUND('',#93,.T.);

+#95=ADVANCED_FACE('',(#83,#94),#72,.F.);

+#96=CARTESIAN_POINT('',(0.0,-23.75,-1.5));

+#97=DIRECTION('',(0.0,0.0,-1.0));

+#98=DIRECTION('',(-1.0,0.0,0.0));

+#99=AXIS2_PLACEMENT_3D('',#96,#97,#98);

+#100=PLANE('',#99);

+#101=CARTESIAN_POINT('',(0.0,-31.5,-1.500000000000001));

+#102=VERTEX_POINT('',#101);

+#103=CARTESIAN_POINT('',(0.0,0.0,-1.500000000000001));

+#104=DIRECTION('',(0.0,0.0,1.0));

+#105=DIRECTION('',(0.0,-1.0,0.0));

+#106=AXIS2_PLACEMENT_3D('',#103,#104,#105);

+#107=CIRCLE('',#106,31.5);

+#108=EDGE_CURVE('',#102,#102,#107,.T.);

+#109=ORIENTED_EDGE('',*,*,#108,.F.);

+#110=EDGE_LOOP('',(#109));

+#111=FACE_OUTER_BOUND('',#110,.T.);

+#112=ORIENTED_EDGE('',*,*,#80,.T.);

+#113=EDGE_LOOP('',(#112));

+#114=FACE_BOUND('',#113,.T.);

+#115=ADVANCED_FACE('',(#111,#114),#100,.T.);

+#116=CARTESIAN_POINT('',(0.0,0.0,-0.75));

+#117=DIRECTION('',(0.0,0.0,1.0));

+#118=DIRECTION('',(0.0,-1.0,0.0));

+#119=AXIS2_PLACEMENT_3D('',#116,#117,#118);

+#120=CYLINDRICAL_SURFACE('',#119,31.5);

+#121=CARTESIAN_POINT('',(0.0,-31.5,0.0));

+#122=VERTEX_POINT('',#121);

+#123=CARTESIAN_POINT('',(0.0,0.0,0.0));

+#124=DIRECTION('',(0.0,0.0,1.0));

+#125=DIRECTION('',(0.0,-1.0,0.0));

+#126=AXIS2_PLACEMENT_3D('',#123,#124,#125);

+#127=CIRCLE('',#126,31.5);

+#128=EDGE_CURVE('',#122,#122,#127,.T.);

+#129=ORIENTED_EDGE('',*,*,#128,.F.);

+#130=EDGE_LOOP('',(#129));

+#131=FACE_OUTER_BOUND('',#130,.T.);

+#132=ORIENTED_EDGE('',*,*,#108,.T.);

+#133=EDGE_LOOP('',(#132));

+#134=FACE_BOUND('',#133,.T.);

+#135=ADVANCED_FACE('',(#131,#134),#120,.T.);

+#136=CARTESIAN_POINT('',(-1.293027E-015,4.934325E-016,0.425));

+#137=DIRECTION('',(0.0,0.0,1.0));

+#138=DIRECTION('',(1.0,0.0,0.0));

+#139=AXIS2_PLACEMENT_3D('',#136,#137,#138);

+#140=PLANE('',#139);

+#141=CARTESIAN_POINT('',(-28.561467761918419,3.497771E-015,0.425));

+#142=VERTEX_POINT('',#141);

+#143=CARTESIAN_POINT('',(0.0,0.0,0.425));

+#144=DIRECTION('',(0.0,0.0,-1.0));

+#145=DIRECTION('',(1.0,0.0,0.0));

+#146=AXIS2_PLACEMENT_3D('',#143,#144,#145);

+#147=CIRCLE('',#146,28.561467761918419);

+#148=EDGE_CURVE('',#142,#142,#147,.T.);

+#149=ORIENTED_EDGE('',*,*,#148,.F.);

+#150=EDGE_LOOP('',(#149));

+#151=FACE_OUTER_BOUND('',#150,.T.);

+#152=CARTESIAN_POINT('',(-18.938532238081581,-2.319301E-015,0.425));

+#153=VERTEX_POINT('',#152);

+#154=CARTESIAN_POINT('',(0.0,0.0,0.425));

+#155=DIRECTION('',(0.0,0.0,1.0));

+#156=DIRECTION('',(1.0,0.0,0.0));

+#157=AXIS2_PLACEMENT_3D('',#154,#155,#156);

+#158=CIRCLE('',#157,18.938532238081581);

+#159=EDGE_CURVE('',#153,#153,#158,.T.);

+#160=ORIENTED_EDGE('',*,*,#159,.F.);

+#161=EDGE_LOOP('',(#160));

+#162=FACE_BOUND('',#161,.T.);

+#163=ADVANCED_FACE('',(#151,#162),#140,.T.);

+#164=CARTESIAN_POINT('',(0.0,0.0,0.0));

+#165=DIRECTION('',(0.0,0.0,1.0));

+#166=DIRECTION('',(1.0,0.0,0.0));

+#167=AXIS2_PLACEMENT_3D('',#164,#165,#166);

+#168=TOROIDAL_SURFACE('',#167,30.0,1.5);

+#169=ORIENTED_EDGE('',*,*,#128,.T.);

+#170=EDGE_LOOP('',(#169));

+#171=FACE_OUTER_BOUND('',#170,.T.);

+#172=ORIENTED_EDGE('',*,*,#148,.T.);

+#173=EDGE_LOOP('',(#172));

+#174=FACE_BOUND('',#173,.T.);

+#175=ADVANCED_FACE('',(#171,#174),#168,.T.);

+#176=CARTESIAN_POINT('',(0.0,0.0,0.0));

+#177=DIRECTION('',(0.0,0.0,1.0));

+#178=DIRECTION('',(1.0,0.0,0.0));

+#179=AXIS2_PLACEMENT_3D('',#176,#177,#178);

+#180=TOROIDAL_SURFACE('',#179,17.5,1.5);

+#181=ORIENTED_EDGE('',*,*,#159,.T.);

+#182=EDGE_LOOP('',(#181));

+#183=FACE_OUTER_BOUND('',#182,.T.);

+#184=ORIENTED_EDGE('',*,*,#91,.F.);

+#185=EDGE_LOOP('',(#184));

+#186=FACE_BOUND('',#185,.T.);

+#187=ADVANCED_FACE('',(#183,#186),#180,.T.);

+#188=CLOSED_SHELL('',(#95,#115,#135,#163,#175,#187));

+#189=MANIFOLD_SOLID_BREP('Solid1',#188);

+#190=COLOUR_RGB('Default(1)',0.749019622802734,0.749019622802734,0.584313750267029);

+#191=FILL_AREA_STYLE_COLOUR('Default(1)',#190);

+#192=FILL_AREA_STYLE('Default(1)',(#191));

+#193=SURFACE_STYLE_FILL_AREA(#192);

+#194=SURFACE_SIDE_STYLE('Default(1)',(#193));

+#195=SURFACE_STYLE_USAGE(.BOTH.,#194);

+#196=PRESENTATION_STYLE_ASSIGNMENT((#195));

+#197=STYLED_ITEM('',(#196),#189);

+#198=MECHANICAL_DESIGN_GEOMETRIC_PRESENTATION_REPRESENTATION('',(#197),#36);

+#199=ADVANCED_BREP_SHAPE_REPRESENTATION('ABSR',(#189),#36);

+#200=SHAPE_REPRESENTATION_RELATIONSHIP('SRR','None',#199,#41);

+ENDSEC;

+END-ISO-10303-21;