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Reusable base class to implement Python-style file buffering around a
simpler stream.
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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.
:raises ValueError: if the file is closed.
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Close the file. Future read and write operations will fail.
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Write out any data in the write buffer. This may do nothing if write
buffering is not turned on.
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Returns the next line from the input, or raises
`~exceptions.StopIteration` when EOF is hit. Unlike Python file
objects, it's okay to mix calls to `next` and `readline`.
:raises StopIteration: when the end of the file is reached.
:returns: a line (`str`) read from the file.
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Returns the next line from the input, or raises `.StopIteration` when
EOF is hit. Unlike python file objects, it's okay to mix calls to
`.next` and `.readline`.
:raises StopIteration: when the end of the file is reached.
:returns: a line (`str`) read from the file.
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Check if the file can be read from.
:returns:
`True` if the file can be read from. If `False`, `read` will raise
an exception.
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Check if the file can be written to.
:returns:
`True` if the file can be written to. If `False`, `write` will
raise an exception.
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Check if the file supports random access.
:returns:
`True` if the file supports random access. If `False`, `seek` will
raise an exception.
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Read up to ``len(buff)`` bytes into :class:`bytearray` *buff* and
return the number of bytes read.
:returns:
The number of bytes read.
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Read at most ``size`` bytes from the file (less if we hit the end of the
file first). If the ``size`` argument is negative or omitted, read all
the remaining data in the file.
.. note::
``'b'`` mode flag is ignored (``self.FLAG_BINARY`` in
``self._flags``), because SSH treats all files as binary, since we
have no idea what encoding the file is in, or even if the file is
text data.
:param int size: maximum number of bytes to read
:returns:
data read from the file (as bytes), or an empty string if EOF was
encountered immediately
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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 ``fgets``, the returned string contains null
characters (``'\0'``) if they occurred in the input.
:param int size: maximum length of returned string.
:returns:
next line of the file, or an empty string if the end of the
file has been reached.
If the file was opened in binary (``'b'``) mode: bytes are returned
Else: the encoding of the file is assumed to be UTF-8 and character
strings (`str`) are returned
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Read all remaining lines using `readline` and return them as a list.
If the optional ``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 int sizehint: desired maximum number of bytes to read.
:returns: `list` of lines read from the file.
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Set the file's current position, like stdio's ``fseek``. Not all file
objects support seeking.
.. note::
If a file is opened in append mode (``'a'`` or ``'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 int offset:
position to move to within the file, relative to ``whence``.
:param int whence:
type of movement: 0 = absolute; 1 = relative to the current
position; 2 = relative to the end of the file.
:raises IOError: if the file doesn't support random access.
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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.
:returns: file position (`number <int>` of bytes).
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Write data to the file. If write buffering is on (``bufsize`` was
specified and non-zero), some or all of the data may not actually be
written yet. (Use `flush` or `close` to force buffered data to be
written out.)
:param str data: data to write
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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 `readlines`; `writelines` does not add line
separators.)
:param iterable sequence: an iterable sequence of strings.
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Identical to ``iter(f)``. This is a deprecated file interface that
predates Python iterator support.
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(subclass override)
Read data from the stream. Return ``None`` or raise ``EOFError`` to
indicate EOF.
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Write data into the stream.
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(subclass override)
Return the size of the file. This is called from within `_set_mode`
if the file is opened in append mode, so the file position can be
tracked and `seek` and `tell` will work correctly. If the file is
a stream that can't be randomly accessed, you don't need to override
this method,
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Subclasses call this method to initialize the BufferedFile.
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