71 lines
2.9 KiB
OCaml
71 lines
2.9 KiB
OCaml
(*----------------------------------------------------------------------------
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* Copyright (c) 2019 António Nuno Monteiro
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*---------------------------------------------------------------------------*)
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open Util
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type t =
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{ exclusive : bool
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; stream_dependency : Stream_identifier.t
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; weight : int
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}
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(* From RFC7540§5.3.5:
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* All streams are initially assigned a non-exclusive dependency on stream
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* 0x0. Pushed streams (Section 8.2) initially depend on their associated
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* stream. In both cases, streams are assigned a default weight of 16. *)
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let default_priority =
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{ exclusive = false; stream_dependency = 0l; weight = 16 }
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(* From RFC7540§5.4.1:
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* All dependent streams are allocated an integer weight between 1 and 256
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* (inclusive). *)
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let highest_priority =
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{ exclusive = false; stream_dependency = 0l; weight = 256 }
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(* --- Exclusive flag ---
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*
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* From RFC7540§5.4.1:
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* +-+-------------------------------------------------------------+
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* |E| Stream Dependency (31) |
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* +-+-------------+-----------------------------------------------+
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* | Weight (8) |
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* +-+-------------+
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*)
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let test_exclusive n = test_bit_int32 n 31
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let set_exclusive n = set_bit_int32 n 31
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let clear_exclusive n = clear_bit_int32 n 31
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let equal p1 p2 =
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p1.weight = p2.weight
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&& Int32.equal p1.stream_dependency p2.stream_dependency
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&& p1.exclusive = p2.exclusive
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