def write(self, offset, data):
"""
Write ``data`` into this file at position ``offset``. Extending the
file past its original end is expected. Unlike Python's normal
``write()`` methods, this method cannot do a partial write: it must
write all of ``data`` or else return an error.
The default implementation checks for an attribute on ``self`` named
``writefile``, and if present, performs the write operation on the
Python file-like object found there. The attribute is named
differently from ``readfile`` to make it easy to implement read-only
(or write-only) files, but if both attributes are present, they should
refer to the same file.
:param offset: position in the file to start reading from.
:type offset: int or long
:param str data: data to write into the file.
:return: an SFTP error code like `.SFTP_OK`.
"""
writefile = getattr(self, 'writefile', None)
if writefile is None:
return SFTP_OP_UNSUPPORTED
try:
# in append mode, don't care about seeking
if (self.__flags & os.O_APPEND) == 0:
if self.__tell is None:
self.__tell = writefile.tell()
if offset != self.__tell:
writefile.seek(offset)
self.__tell = offset
writefile.write(data)
writefile.flush()
except IOError as e:
self.__tell = None
return SFTPServer.convert_errno(e.errno)
if self.__tell is not None:
self.__tell += len(data)
return SFTP_OK
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