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        For other failures, we raise an exception. If a
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        @param channelType: The requested channel type
        @type channelType:  L{bytes}
        @param windowSize:  The initial size of the remote window
        @type windowSize:   L{int}
        @param maxPacket:   The largest packet we should send
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        security hazard.  It is recommended that implementations either
        maintain a list of allowable variable names or only set environment
        variables after the server process has dropped sufficient
        privileges."

        (OpenSSH refuses all environment variables by default, but has an
        C{AcceptEnv} configuration option to select specific variables to
        accept.)

        @param name: The name of the environment variable to set.
        @type name: L{bytes}
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        L{twisted.conch.ssh.filetransfer} as FXF_*.

        @param attrs: a list of attributes to open the file with.  It is a
        dictionary, consisting of 0 or more keys.  The possible keys are::

            size: the size of the file in bytes
            uid: the user ID of the file as an integer
            gid: the group ID of the file as an integer
            permissions: the permissions of the file with as an integer.
            the bit representation of this field is defined by POSIX.
            atime: the access time of the file as seconds since the epoch.
            mtime: the modification time of the file as seconds since the epoch.
            ext_*: extended attributes.  The server is not required to
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        NOTE: there is no way to indicate text or binary files.  it is up
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        The iterable should return triples of the form (filename,
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        filename is the name of the file relative to the directory.
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        1234567890 123 12345678 12345678 12345678 123456789012

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writeChunkzISFTPFile.writeChunk�rrc��y)z�
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