Python BytesIO.seek方法代码示例

# 需要导入模块: from paramiko.py3compat import BytesIO [as 别名]
# 或者: from paramiko.py3compat.BytesIO import seek [as 别名]
class Message (object):
    """
    An SSH2 message is a stream of bytes that encodes some combination of
    strings, integers, bools, and infinite-precision integers (known in Python
    as longs).  This class builds or breaks down such a byte stream.

    Normally you don't need to deal with anything this low-level, but it's
    exposed for people implementing custom extensions, or features that
    paramiko doesn't support yet.
    """

    big_int = long(0xff000000)

    def __init__(self, content=None):
        """
        Create a new SSH2 message.

        :param str content:
            the byte stream to use as the message content (passed in only when
            decomposing a message).
        """
        if content is not None:
            self.packet = BytesIO(content)
        else:
            self.packet = BytesIO()

    def __str__(self):
        """
        Return the byte stream content of this message, as a string/bytes obj.
        """
        return self.asbytes()

    def __repr__(self):
        """
        Returns a string representation of this object, for debugging.
        """
        return 'paramiko.Message(' + repr(self.packet.getvalue()) + ')'

    def asbytes(self):
        """
        Return the byte stream content of this Message, as bytes.
        """
        return self.packet.getvalue()

    def rewind(self):
        """
        Rewind the message to the beginning as if no items had been parsed
        out of it yet.
        """
        self.packet.seek(0)

    def get_remainder(self):
        """
        Return the bytes (as a `str`) of this message that haven't already been
        parsed and returned.
        """
        position = self.packet.tell()
        remainder = self.packet.read()
        self.packet.seek(position)
        return remainder

    def get_so_far(self):
        """
        Returns the `str` bytes of this message that have been parsed and
        returned. The string passed into a message's constructor can be
        regenerated by concatenating ``get_so_far`` and `get_remainder`.
        """
        position = self.packet.tell()
        self.rewind()
        return self.packet.read(position)

    def get_bytes(self, n):
        """
        Return the next ``n`` bytes of the message (as a `str`), without
        decomposing into an int, decoded string, etc.  Just the raw bytes are
        returned. Returns a string of ``n`` zero bytes if there weren't ``n``
        bytes remaining in the message.
        """
        b = self.packet.read(n)
        max_pad_size = 1 << 20  # Limit padding to 1 MB
        if len(b) < n < max_pad_size:
            return b + zero_byte * (n - len(b))
        return b

    def get_byte(self):
        """
        Return the next byte of the message, without decomposing it.  This
        is equivalent to `get_bytes(1) <get_bytes>`.

        :return:
            the next (`str`) byte of the message, or ``'\000'`` if there aren't
            any bytes remaining.
        """
        return self.get_bytes(1)

    def get_boolean(self):
        """
        Fetch a boolean from the stream.
        """
        b = self.get_bytes(1)
#.........这里部分代码省略.........