A stream is a linear array of bytes that may be accessed sequentially or
randomly.  DOS files are streams.  IFFParse uses Release 2 hook structures
(defined in <utility/hooks.h>) to implement a general stream management
facility.  This allows the IFFParse library to read, write, and seek any
type of file handle or device by using an application-provided hook
function to open, read, write, seek and close the stream.

Built on top of this facility, IFFParse has two internal stream managers:
one for unbuffered DOS files (AmigaDOS filehandles), and one for the
Clipboard.

 initialization    termination    custom streams