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To tell IFFParse you are about to begin writing a new chunk, you use the
function PushChunk():

    error = PushChunk (iff, ID_ILBM, ID_BMHD,chunksize);

The chunk ID and size are written to the stream.  IFFParse will enforce
the chunk size you specified; attempts to write past the end of the chunk
will be truncated.  If, as a chunk size argument, you pass IFFSIZE_UNKNOWN,
the chunk will be expanded in size as you write data to it.