When you are through writing data to a chunk, you complete the write by
calling PopChunk():

    error = PopChunk (iff);

If you wrote fewer bytes than you declared with PushChunk(), PopChunk()
will return an error.  If you specified IFFSIZE_UNKNOWN, PopChunk() will
seek backward on the stream and write the final size.  If you specified a
chunk size that was odd, PopChunk() will write the pad byte automatically.

PushChunk() and PopChunk() nest; every call to PushChunk() must have a
corresponding call to PopChunk().

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