This file is indexed.

/usr/lib/python3/dist-packages/stl/stl.py is in python3-stl 2.3.2-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
from __future__ import (absolute_import, division, print_function,
                        unicode_literals)

import io
import os
import enum
import numpy
import struct
import logging
import datetime

from . import base
from . import __about__ as metadata
from .utils import b
from .utils import s

try:
    from . import _speedups
except ImportError:  # pragma: no cover
    _speedups = None


logger = logging.getLogger(__name__)


class Mode(enum.IntEnum):
    #: Automatically detect whether the output is a TTY, if so, write ASCII
    #: otherwise write BINARY
    AUTOMATIC = 0
    #: Force writing ASCII
    ASCII = 1
    #: Force writing BINARY
    BINARY = 2


# For backwards compatibility, leave the original references
AUTOMATIC = Mode.AUTOMATIC
ASCII = Mode.ASCII
BINARY = Mode.BINARY


#: Amount of bytes to read while using buffered reading
BUFFER_SIZE = 4096
#: The amount of bytes in the header field
HEADER_SIZE = 80
#: The amount of bytes in the count field
COUNT_SIZE = 4
#: The maximum amount of triangles we can read from binary files
MAX_COUNT = 1e8


class BaseStl(base.BaseMesh):

    @classmethod
    def load(cls, fh, mode=AUTOMATIC, speedups=True):
        '''Load Mesh from STL file

        Automatically detects binary versus ascii STL files.

        :param file fh: The file handle to open
        :param int mode: Automatically detect the filetype or force binary
        '''
        header = fh.read(HEADER_SIZE).lower()
        if not header:
            return

        if isinstance(header, str):  # pragma: no branch
            header = b(header)

        name = ''

        if mode in (AUTOMATIC, ASCII) and header.startswith(b('solid')):
            try:
                name, data = cls._load_ascii(
                    fh, header, speedups=speedups)
            except RuntimeError as exception:
                (recoverable, e) = exception.args
                # If we didn't read beyond the header the stream is still
                # readable through the binary reader
                if recoverable:
                    name, data = cls._load_binary(fh, header, check_size=False)
                else:
                    # Apparently we've read beyond the header. Let's try
                    # seeking :)
                    # Note that this fails when reading from stdin, we can't
                    # recover from that.
                    fh.seek(HEADER_SIZE)

                    # Since we know this is a seekable file now and we're not
                    # 100% certain it's binary, check the size while reading
                    name, data = cls._load_binary(fh, header, check_size=True)
        else:
            name, data = cls._load_binary(fh, header)

        return name, data

    @classmethod
    def _load_binary(cls, fh, header, check_size=False):
        # Read the triangle count
        count_data = fh.read(COUNT_SIZE)
        if len(count_data) != COUNT_SIZE:
            count = 0
        else:
            count, = struct.unpack(s('<i'), b(count_data))
        # raise RuntimeError()
        assert count < MAX_COUNT, ('File too large, got %d triangles which '
                                   'exceeds the maximum of %d') % (
                                       count, MAX_COUNT)

        if check_size:
            try:
                # Check the size of the file
                fh.seek(0, os.SEEK_END)
                raw_size = fh.tell() - HEADER_SIZE - COUNT_SIZE
                expected_count = int(raw_size / cls.dtype.itemsize)
                assert expected_count == count, ('Expected %d vectors but '
                                                 'header indicates %d') % (
                                                     expected_count, count)
                fh.seek(HEADER_SIZE + COUNT_SIZE)
            except IOError:  # pragma: no cover
                pass

        name = header.strip()

        # Read the rest of the binary data
        return name, numpy.fromfile(fh, dtype=cls.dtype, count=count)

    @classmethod
    def _ascii_reader(cls, fh, header):
        if b'\n' in header:
            recoverable = [True]
        else:
            recoverable = [False]
            header += b(fh.read(BUFFER_SIZE))

        lines = b(header).split(b('\n'))

        def get(prefix=''):
            prefix = b(prefix)

            if lines:
                line = lines.pop(0)
            else:
                raise RuntimeError(recoverable[0], 'Unable to find more lines')
            if not lines:
                recoverable[0] = False

                # Read more lines and make sure we prepend any old data
                lines[:] = b(fh.read(BUFFER_SIZE)).split(b('\n'))
                line += lines.pop(0)

            line = line.lower().strip()
            if line == b(''):
                return get(prefix)

            if prefix:
                if line.startswith(prefix):
                    values = line.replace(prefix, b(''), 1).strip().split()
                elif line.startswith(b('endsolid')):
                    # go back to the beginning of new solid part
                    size_unprocessedlines = sum(len(l) + 1 for l in lines) - 1
                    if size_unprocessedlines > 0:
                        position = fh.tell()
                        fh.seek(position - size_unprocessedlines)
                    raise StopIteration()
                else:
                    raise RuntimeError(recoverable[0],
                                       '%r should start with %r' % (line,
                                                                    prefix))

                if len(values) == 3:
                    return [float(v) for v in values]
                else:  # pragma: no cover
                    raise RuntimeError(recoverable[0],
                                       'Incorrect value %r' % line)
            else:
                return b(line)

        line = get()
        if not line.startswith(b('solid ')) and line.startswith(b('solid')):
            cls.warning('ASCII STL files should start with solid <space>. '
                        'The application that produced this STL file may be '
                        'faulty, please report this error. The erroneous '
                        'line: %r', line)

        if not lines:
            raise RuntimeError(recoverable[0],
                               'No lines found, impossible to read')

        # Yield the name
        yield line[5:].strip()

        while True:
            # Read from the header lines first, until that point we can recover
            # and go to the binary option. After that we cannot due to
            # unseekable files such as sys.stdin
            #
            # Numpy doesn't support any non-file types so wrapping with a
            # buffer and/or StringIO does not work.
            try:
                normals = get('facet normal')
                assert get() == b('outer loop')
                v0 = get('vertex')
                v1 = get('vertex')
                v2 = get('vertex')
                assert get() == b('endloop')
                assert get() == b('endfacet')
                attrs = 0
                yield (normals, (v0, v1, v2), attrs)
            except AssertionError as e:  # pragma: no cover
                raise RuntimeError(recoverable[0], e)
            except StopIteration:
                raise

    @classmethod
    def _load_ascii(cls, fh, header, speedups=True):
        if _speedups and speedups:
            return _speedups.ascii_read(fh, header)
        else:
            iterator = cls._ascii_reader(fh, header)
            name = next(iterator)
            return name, numpy.fromiter(iterator, dtype=cls.dtype)

    def save(self, filename, fh=None, mode=AUTOMATIC, update_normals=True):
        '''Save the STL to a (binary) file

        If mode is :py:data:`AUTOMATIC` an :py:data:`ASCII` file will be
        written if the output is a TTY and a :py:data:`BINARY` file otherwise.

        :param str filename: The file to load
        :param file fh: The file handle to open
        :param int mode: The mode to write, default is :py:data:`AUTOMATIC`.
        :param bool update_normals: Whether to update the normals
        '''
        assert filename, 'Filename is required for the STL headers'
        if update_normals:
            self.update_normals()

        if mode is AUTOMATIC:
            if fh and os.isatty(fh.fileno()):  # pragma: no cover
                write = self._write_ascii
            else:
                write = self._write_binary
        elif mode is BINARY:
            write = self._write_binary
        elif mode is ASCII:
            write = self._write_ascii
        else:
            raise ValueError('Mode %r is invalid' % mode)

        name = os.path.split(filename)[-1]
        try:
            if fh:
                write(fh, name)
            else:
                with open(filename, 'wb') as fh:
                    write(fh, filename)
        except IOError:  # pragma: no cover
            pass

    def _write_ascii(self, fh, name):
        if _speedups and self.speedups:
            _speedups.ascii_write(fh, b(name), self.data)
        else:
            def p(s, file):
                file.write(b('%s\n' % s))

            p('solid %s' % name, file=fh)

            for row in self.data:
                vectors = row['vectors']
                p('facet normal %f %f %f' % tuple(row['normals']), file=fh)
                p('  outer loop', file=fh)
                p('    vertex %f %f %f' % tuple(vectors[0]), file=fh)
                p('    vertex %f %f %f' % tuple(vectors[1]), file=fh)
                p('    vertex %f %f %f' % tuple(vectors[2]), file=fh)
                p('  endloop', file=fh)
                p('endfacet', file=fh)

            p('endsolid %s' % name, file=fh)

    def _write_binary(self, fh, name):
        # Create the header
        header = '%s (%s) %s %s' % (
            metadata.__package_name__,
            metadata.__version__,
            datetime.datetime.now(),
            name,
        )

        # Make it exactly 80 characters
        header = header[:80].ljust(80, ' ')
        packed = struct.pack(s('<i'), self.data.size)

        if isinstance(fh, io.TextIOWrapper):  # pragma: no cover
            packed = str(packed)
        else:
            header = b(header)
            packed = b(packed)

        fh.write(header)
        fh.write(packed)
        self.data.tofile(fh)

        if self.data.size:  # pragma: no cover
            assert fh.tell() > 84, (
                'numpy silently refused to write our file. Note that writing '
                'to `StringIO` objects is not supported by `numpy`')

    @classmethod
    def from_file(cls, filename, calculate_normals=True, fh=None,
                  mode=Mode.AUTOMATIC, speedups=True, **kwargs):
        '''Load a mesh from a STL file

        :param str filename: The file to load
        :param bool calculate_normals: Whether to update the normals
        :param file fh: The file handle to open
        :param dict \**kwargs: The same as for :py:class:`stl.mesh.Mesh`

        '''
        if fh:
            name, data = cls.load(
                fh, mode=mode, speedups=speedups)
        else:
            try:
                with open(filename, 'rb') as fh:
                    name, data = cls.load(
                        fh, mode=mode, speedups=speedups)
            except AssertionError:  # pragma: no cover
                logger.warn('Unable to read the file with speedups, retrying')
                with open(filename, 'rb') as fh:
                    name, data = cls.load(
                        fh, mode=Mode.ASCII, speedups=False)

        return cls(data, calculate_normals, name=name,
                   speedups=speedups, **kwargs)

    @classmethod
    def from_multi_file(cls, filename, calculate_normals=True, fh=None,
                        mode=ASCII, speedups=True, **kwargs):
        '''Load multiple meshes from a STL file

        :param str filename: The file to load
        :param bool calculate_normals: Whether to update the normals
        :param file fh: The file handle to open
        :param dict \**kwargs: The same as for :py:class:`stl.mesh.Mesh`
        '''
        if fh:
            close = False
        else:
            fh = open(filename, 'rb')
            close = True

        try:
            raw_data = cls.load(fh, mode=mode, speedups=speedups)
            while raw_data:
                name, data = raw_data
                yield cls(data, calculate_normals, name=name,
                          speedups=speedups, **kwargs)
                raw_data = cls.load(fh, mode=mode,
                                    speedups=speedups)

        finally:
            if close:
                fh.close()


StlMesh = BaseStl.from_file