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Implementation of an SSH2 "message".
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    An SSH2 message is a stream of bytes that encodes some combination of
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    as longs).  This class builds or breaks down such a byte stream.
    
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        Create a new SSH2 message.

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        Return the byte stream content of this message, as a string/bytes obj.
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        Returns a string representation of this object, for debugging.
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        Return the byte stream content of this Message, as bytes.
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        Rewind the message to the beginning as if no items had been parsed
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        Return the bytes (as a `str`) of this message that haven't already been
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        Returns the `str` bytes of this message that have been parsed and
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        Return the next ``n`` bytes of the message (as a `str`), without
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        bytes remaining in the message.
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        Return the next byte of the message, without decomposing it.  This
        is equivalent to `get_bytes(1) <get_bytes>`.

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            any bytes remaining.
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        Fetch a boolean from the stream.
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        Fetch an int from the stream.

        :return: a 32-bit unsigned `int`.
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        Fetch an int from the stream.

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        Fetch a 64-bit int from the stream.

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        Fetch a long int (mpint) from the stream.

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        Fetch a `str` from the stream.  This could be a byte string and may
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        Fetch a string from the stream.  This could be a byte string and may
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        Fetch a string from the stream.  This could be a byte string and may
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        Fetch a `list` of `strings <str>` from the stream.
        
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        Write bytes to the stream, without any formatting.
        
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        Write a single byte to the stream, without any formatting.
        
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        Add a boolean value to the stream.
        
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        Add an integer to the stream.
        
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        Add an integer to the stream.
        
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        Add a 64-bit int to the stream.

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        Add a long int to the stream, encoded as an infinite-precision
        integer.  This method only works on positive numbers.
        
        :param long z: long int to add
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        Add a string to the stream.
        
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        Add a list of strings to the stream.  They are encoded identically to
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        Add a sequence of items to the stream.  The values are encoded based
        on their type: str, int, bool, list, or long.

        .. warning::
            Longs are encoded non-deterministically.  Don't use this method.
        
        :param seq: the sequence of items
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