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The STREAM data to send coming from the upper layer must be stored until having being acked by the peer. To do so, we store them in buffer structs, one by stream (see qcs.tx.buf). Each time a STREAM is built by quic_push_frame(), its offset must match the offset of the first byte added to the buffer (modulo the size of the buffer) by the frame. As they are not always acknowledged in order, they may be stored in eb_trees ordered by their offset to be sure to sequentially delete the STREAM data from their buffer, in the order they have been added to it.