This file is indexed.

/usr/share/pyshared/paramiko/file.py is in python-paramiko 1.7.7.1-2.

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
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
# Copyright (C) 2003-2007  Robey Pointer <robeypointer@gmail.com>
#
# This file is part of paramiko.
#
# Paramiko is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 2.1 of the License, or (at your option)
# any later version.
#
# Paramiko is distrubuted in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.

"""
BufferedFile.
"""

from cStringIO import StringIO


class BufferedFile (object):
    """
    Reusable base class to implement python-style file buffering around a
    simpler stream.
    """

    _DEFAULT_BUFSIZE = 8192

    SEEK_SET = 0
    SEEK_CUR = 1
    SEEK_END = 2

    FLAG_READ = 0x1
    FLAG_WRITE = 0x2
    FLAG_APPEND = 0x4
    FLAG_BINARY = 0x10
    FLAG_BUFFERED = 0x20
    FLAG_LINE_BUFFERED = 0x40
    FLAG_UNIVERSAL_NEWLINE = 0x80

    def __init__(self):
        self.newlines = None
        self._flags = 0
        self._bufsize = self._DEFAULT_BUFSIZE
        self._wbuffer = StringIO()
        self._rbuffer = ''
        self._at_trailing_cr = False
        self._closed = False
        # pos - position within the file, according to the user
        # realpos - position according the OS
        # (these may be different because we buffer for line reading)
        self._pos = self._realpos = 0
        # size only matters for seekable files
        self._size = 0

    def __del__(self):
        self.close()
        
    def __iter__(self):
        """
        Returns an iterator that can be used to iterate over the lines in this
        file.  This iterator happens to return the file itself, since a file is
        its own iterator.

        @raise ValueError: if the file is closed.
        
        @return: an interator.
        @rtype: iterator
        """
        if self._closed:
            raise ValueError('I/O operation on closed file')
        return self

    def close(self):
        """
        Close the file.  Future read and write operations will fail.
        """
        self.flush()
        self._closed = True

    def flush(self):
        """
        Write out any data in the write buffer.  This may do nothing if write
        buffering is not turned on.
        """
        self._write_all(self._wbuffer.getvalue())
        self._wbuffer = StringIO()
        return

    def next(self):
        """
        Returns the next line from the input, or raises L{StopIteration} when
        EOF is hit.  Unlike python file objects, it's okay to mix calls to
        C{next} and L{readline}.

        @raise StopIteration: when the end of the file is reached.

        @return: a line read from the file.
        @rtype: str
        """
        line = self.readline()
        if not line:
            raise StopIteration
        return line

    def read(self, size=None):
        """
        Read at most C{size} bytes from the file (less if we hit the end of the
        file first).  If the C{size} argument is negative or omitted, read all
        the remaining data in the file.

        @param size: maximum number of bytes to read
        @type size: int
        @return: data read from the file, or an empty string if EOF was
            encountered immediately
        @rtype: str
        """
        if self._closed:
            raise IOError('File is closed')
        if not (self._flags & self.FLAG_READ):
            raise IOError('File is not open for reading')
        if (size is None) or (size < 0):
            # go for broke
            result = self._rbuffer
            self._rbuffer = ''
            self._pos += len(result)
            while True:
                try:
                    new_data = self._read(self._DEFAULT_BUFSIZE)
                except EOFError:
                    new_data = None
                if (new_data is None) or (len(new_data) == 0):
                    break
                result += new_data
                self._realpos += len(new_data)
                self._pos += len(new_data)
            return result
        if size <= len(self._rbuffer):
            result = self._rbuffer[:size]
            self._rbuffer = self._rbuffer[size:]
            self._pos += len(result)
            return result
        while len(self._rbuffer) < size:
            read_size = size - len(self._rbuffer)
            if self._flags & self.FLAG_BUFFERED:
                read_size = max(self._bufsize, read_size)
            try:
                new_data = self._read(read_size)
            except EOFError:
                new_data = None
            if (new_data is None) or (len(new_data) == 0):
                break
            self._rbuffer += new_data
            self._realpos += len(new_data)
        result = self._rbuffer[:size]
        self._rbuffer = self._rbuffer[size:]
        self._pos += len(result)
        return result

    def readline(self, size=None):
        """
        Read one entire line from the file.  A trailing newline character is
        kept in the string (but may be absent when a file ends with an
        incomplete line).  If the size argument is present and non-negative, it
        is a maximum byte count (including the trailing newline) and an
        incomplete line may be returned.  An empty string is returned only when
        EOF is encountered immediately.

        @note: Unlike stdio's C{fgets()}, the returned string contains null
        characters (C{'\\0'}) if they occurred in the input.

        @param size: maximum length of returned string.
        @type size: int
        @return: next line of the file, or an empty string if the end of the
            file has been reached.
        @rtype: str
        """
        # it's almost silly how complex this function is.
        if self._closed:
            raise IOError('File is closed')
        if not (self._flags & self.FLAG_READ):
            raise IOError('File not open for reading')
        line = self._rbuffer
        while True:
            if self._at_trailing_cr and (self._flags & self.FLAG_UNIVERSAL_NEWLINE) and (len(line) > 0):
                # edge case: the newline may be '\r\n' and we may have read
                # only the first '\r' last time.
                if line[0] == '\n':
                    line = line[1:]
                    self._record_newline('\r\n')
                else:
                    self._record_newline('\r')
                self._at_trailing_cr = False
            # check size before looking for a linefeed, in case we already have
            # enough.
            if (size is not None) and (size >= 0):
                if len(line) >= size:
                    # truncate line and return
                    self._rbuffer = line[size:]
                    line = line[:size]
                    self._pos += len(line)
                    return line
                n = size - len(line)
            else:
                n = self._bufsize
            if ('\n' in line) or ((self._flags & self.FLAG_UNIVERSAL_NEWLINE) and ('\r' in line)):
                break
            try:
                new_data = self._read(n)
            except EOFError:
                new_data = None
            if (new_data is None) or (len(new_data) == 0):
                self._rbuffer = ''
                self._pos += len(line)
                return line
            line += new_data
            self._realpos += len(new_data)
        # find the newline
        pos = line.find('\n')
        if self._flags & self.FLAG_UNIVERSAL_NEWLINE:
            rpos = line.find('\r')
            if (rpos >= 0) and ((rpos < pos) or (pos < 0)):
                pos = rpos
        xpos = pos + 1
        if (line[pos] == '\r') and (xpos < len(line)) and (line[xpos] == '\n'):
            xpos += 1
        self._rbuffer = line[xpos:]
        lf = line[pos:xpos]
        line = line[:pos] + '\n'
        if (len(self._rbuffer) == 0) and (lf == '\r'):
            # we could read the line up to a '\r' and there could still be a
            # '\n' following that we read next time.  note that and eat it.
            self._at_trailing_cr = True
        else:
            self._record_newline(lf)
        self._pos += len(line)
        return line

    def readlines(self, sizehint=None):
        """
        Read all remaining lines using L{readline} and return them as a list.
        If the optional C{sizehint} argument is present, instead of reading up
        to EOF, whole lines totalling approximately sizehint bytes (possibly
        after rounding up to an internal buffer size) are read.

        @param sizehint: desired maximum number of bytes to read.
        @type sizehint: int
        @return: list of lines read from the file.
        @rtype: list
        """
        lines = []
        bytes = 0
        while True:
            line = self.readline()
            if len(line) == 0:
                break
            lines.append(line)
            bytes += len(line)
            if (sizehint is not None) and (bytes >= sizehint):
                break
        return lines

    def seek(self, offset, whence=0):
        """
        Set the file's current position, like stdio's C{fseek}.  Not all file
        objects support seeking.

        @note: If a file is opened in append mode (C{'a'} or C{'a+'}), any seek
            operations will be undone at the next write (as the file position
            will move back to the end of the file).
        
        @param offset: position to move to within the file, relative to
            C{whence}.
        @type offset: int
        @param whence: type of movement: 0 = absolute; 1 = relative to the
            current position; 2 = relative to the end of the file.
        @type whence: int

        @raise IOError: if the file doesn't support random access.
        """
        raise IOError('File does not support seeking.')

    def tell(self):
        """
        Return the file's current position.  This may not be accurate or
        useful if the underlying file doesn't support random access, or was
        opened in append mode.

        @return: file position (in bytes).
        @rtype: int
        """
        return self._pos

    def write(self, data):
        """
        Write data to the file.  If write buffering is on (C{bufsize} was
        specified and non-zero), some or all of the data may not actually be
        written yet.  (Use L{flush} or L{close} to force buffered data to be
        written out.)

        @param data: data to write.
        @type data: str
        """
        if self._closed:
            raise IOError('File is closed')
        if not (self._flags & self.FLAG_WRITE):
            raise IOError('File not open for writing')
        if not (self._flags & self.FLAG_BUFFERED):
            self._write_all(data)
            return
        self._wbuffer.write(data)
        if self._flags & self.FLAG_LINE_BUFFERED:
            # only scan the new data for linefeed, to avoid wasting time.
            last_newline_pos = data.rfind('\n')
            if last_newline_pos >= 0:
                wbuf = self._wbuffer.getvalue()
                last_newline_pos += len(wbuf) - len(data)
                self._write_all(wbuf[:last_newline_pos + 1])
                self._wbuffer = StringIO()
                self._wbuffer.write(wbuf[last_newline_pos + 1:])
            return
        # even if we're line buffering, if the buffer has grown past the
        # buffer size, force a flush.
        if self._wbuffer.tell() >= self._bufsize:
            self.flush()
        return

    def writelines(self, sequence):
        """
        Write a sequence of strings to the file.  The sequence can be any
        iterable object producing strings, typically a list of strings.  (The
        name is intended to match L{readlines}; C{writelines} does not add line
        separators.)

        @param sequence: an iterable sequence of strings.
        @type sequence: sequence
        """
        for line in sequence:
            self.write(line)
        return

    def xreadlines(self):
        """
        Identical to C{iter(f)}.  This is a deprecated file interface that
        predates python iterator support.

        @return: an iterator.
        @rtype: iterator
        """
        return self


    ###  overrides...


    def _read(self, size):
        """
        I{(subclass override)}
        Read data from the stream.  Return C{None} or raise C{EOFError} to
        indicate EOF.
        """
        raise EOFError()

    def _write(self, data):
        """
        I{(subclass override)}
        Write data into the stream.
        """
        raise IOError('write not implemented')

    def _get_size(self):
        """
        I{(subclass override)}
        Return the size of the file.  This is called from within L{_set_mode}
        if the file is opened in append mode, so the file position can be
        tracked and L{seek} and L{tell} will work correctly.  If the file is
        a stream that can't be randomly accessed, you don't need to override
        this method,
        """
        return 0


    ###  internals...


    def _set_mode(self, mode='r', bufsize=-1):
        """
        Subclasses call this method to initialize the BufferedFile.
        """
        # set bufsize in any event, because it's used for readline().
        self._bufsize = self._DEFAULT_BUFSIZE
        if bufsize < 0:
            # do no buffering by default, because otherwise writes will get
            # buffered in a way that will probably confuse people.
            bufsize = 0
        if bufsize == 1:
            # apparently, line buffering only affects writes.  reads are only
            # buffered if you call readline (directly or indirectly: iterating
            # over a file will indirectly call readline).
            self._flags |= self.FLAG_BUFFERED | self.FLAG_LINE_BUFFERED
        elif bufsize > 1:
            self._bufsize = bufsize
            self._flags |= self.FLAG_BUFFERED
            self._flags &= ~self.FLAG_LINE_BUFFERED
        elif bufsize == 0:
            # unbuffered
            self._flags &= ~(self.FLAG_BUFFERED | self.FLAG_LINE_BUFFERED)

        if ('r' in mode) or ('+' in mode):
            self._flags |= self.FLAG_READ
        if ('w' in mode) or ('+' in mode):
            self._flags |= self.FLAG_WRITE
        if ('a' in mode):
            self._flags |= self.FLAG_WRITE | self.FLAG_APPEND
            self._size = self._get_size()
            self._pos = self._realpos = self._size
        if ('b' in mode):
            self._flags |= self.FLAG_BINARY
        if ('U' in mode):
            self._flags |= self.FLAG_UNIVERSAL_NEWLINE
            # built-in file objects have this attribute to store which kinds of
            # line terminations they've seen:
            # <http://www.python.org/doc/current/lib/built-in-funcs.html>
            self.newlines = None

    def _write_all(self, data):
        # the underlying stream may be something that does partial writes (like
        # a socket).
        while len(data) > 0:
            count = self._write(data)
            data = data[count:]
            if self._flags & self.FLAG_APPEND:
                self._size += count
                self._pos = self._realpos = self._size
            else:
                self._pos += count
                self._realpos += count
        return None

    def _record_newline(self, newline):
        # silliness about tracking what kinds of newlines we've seen.
        # i don't understand why it can be None, a string, or a tuple, instead
        # of just always being a tuple, but we'll emulate that behavior anyway.
        if not (self._flags & self.FLAG_UNIVERSAL_NEWLINE):
            return
        if self.newlines is None:
            self.newlines = newline
        elif (type(self.newlines) is str) and (self.newlines != newline):
            self.newlines = (self.newlines, newline)
        elif newline not in self.newlines:
            self.newlines += (newline,)