87 lines
2.3 KiB
Python
87 lines
2.3 KiB
Python
import re
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import os
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import struct
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from django.forms import ModelForm
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from django import forms
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from models import Geometry
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facet_pattern = re.compile(r'facet normal\s+[0-9.e+-]+\s+[0-9.e+-]+\s+[0-9.e+-]+')
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loop_pattern = re.compile(r'outer\s+loop')
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vertex_pattern = re.compile(r'vertex\s+[0-9.e+-]+\s+[0-9.e+-]+\s+[0-9.e+-]+')
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endloop_pattern = re.compile(r'endloop')
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endfacet_pattern = re.compile(r'endfacet')
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endsolid_pattern = re.compile(r'endsolid .*')
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class STLUploadForm(ModelForm):
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def clean_file(self):
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stlfile = self.cleaned_data.get("file")
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stlfile.open()
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if stlfile.read(5) != "solid":
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#print "binary"
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#Skip header
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stlfile.seek(80)
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count = struct.unpack("i",stlfile.read(4))[0]
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if stlfile.size - 84 != count * 50:
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raise forms.ValidationError("Not a valid binary STL file.")
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else:
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#print "ascii"
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next_patterns = [facet_pattern]
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stlfile.readline()
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line = stlfile.readline().strip()
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matched_pattern = None
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vertex_count = 0
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while line != "":
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corret = False
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for pattern in next_patterns:
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if pattern.match(line) != None:
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corret = True
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matched_pattern = pattern
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if not corret:
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raise forms.ValidationError("Not a valid ascii STL file.")
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if matched_pattern == facet_pattern:
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next_patterns = [loop_pattern]
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if matched_pattern == loop_pattern:
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vertex_count = 0
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next_patterns = [vertex_pattern]
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if matched_pattern == vertex_pattern:
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vertex_count += 1
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if vertex_count < 3:
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next_patterns = [vertex_pattern, endloop_pattern]
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else :
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next_patterns = [endloop_pattern]
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if matched_pattern == endloop_pattern:
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next_patterns = [endfacet_pattern]
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if matched_pattern == endfacet_pattern:
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next_patterns = [facet_pattern, endsolid_pattern]
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line = stlfile.readline().strip()
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if matched_pattern != endsolid_pattern:
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raise forms.ValidationError("Not a valid ascii STL file.")
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stlfile.close()
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return stlfile
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class GeometryForm(STLUploadForm):
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class Meta:
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model = Geometry
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fields = ['name', 'description', 'public', 'expiration', 'file', 'sourcefile']
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class AnonymousGeometryForm(STLUploadForm):
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expiration = forms.ChoiceField(choices=Geometry.EXPIRATION_CHOICES[:-1])
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class Meta:
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model = Geometry
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fields = ['name', 'description', 'public', 'expiration', 'file']
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