NAME
    OpenIFF -- Prepare an iffhandle to read or write a new iff stream.

SYNOPSIS
    error = OpenIFF (iff, rwmode)
     d0              a0     d0

    LONG             error;
    struct iffhandle *iff;
    LONG             rwmode;

FUNCTION
    Initializes an iffhandle struct for a new read or write.  the
    direction of the I/O is given by the value of rwmode, which can be
    either IFFF_READ or IFFF_WRITE.

    As part of its initialization procedure, OpenIFF() calls the client-
    supplied stream hook vector.  The iffstreamcmd packet will contain
    the following:

            sc_Command:     IFFCMD_INIT
            sc_Buf:         (Not applicable)
            sc_NBytes:      (Not applicable)

    This operation is permitted to fail.  DO NOT write to this structure.

INPUTS
    iff     - pointer to iffhandle struct.
    rwmode  - IFFF_READ or IFFF_WRITE

RESULT
    error   - contains an error code or 0 if successful.

EXAMPLE

NOTES

BUGS

SEE ALSO
    closeiff(), initiff()