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Filters are OO (just like the streams and wrappers).
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We use a bucket-brigade (similar concept to Apache2 filters)
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Brigade is a doubly-linked list that contains a number of data buckets
chained together.
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No need to maintain/realloc a monolithic buffer.
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meta-buckets can contain information about EOF conditions.
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Useful structure since the data and EOF events may occur
on separate invocations of fread().
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For filters that simply pass through data,
buckets can be passed on to next filter without
the overhead of memcpy()/malloc() - just re-link filter
into the next brigade.
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Separate stacks for reading and writing.
