A buffer that can be partially filled.
Fragments encapsulate pairs of offset and length.
Buffers an inputstream (whose length is known in advance) and can supply clients with fresh "copies" of that inputstream served from the buffer.
A stream that decorates an existing stream and keeps track of the current position.
An input stream which will wrap another input stream (and yield the same bytes) and which can spawn new fresh input stream copies (using
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