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99 lines
3.4 KiB
C++
99 lines
3.4 KiB
C++
/*
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* SPDX-FileCopyrightText: Copyright (c) 1993-2021 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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/******************************* DisplayPort *******************************\
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* *
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* Module: dp_bitstream.h *
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* This is an implementation of the big endian bit stream *
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* *
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\***************************************************************************/
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#ifndef INCLUDED_DP_BITSTREAM_H
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#define INCLUDED_DP_BITSTREAM_H
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#include "dp_buffer.h"
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namespace DisplayPort
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{
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//
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// Bitstream reader interface
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// - reads a packed stream of bits in Big Endian format
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// - handles alignment, buffering, and buffer bounds checking
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//
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class BitStreamReader
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{
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Buffer * sourceBuffer;
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unsigned bitsOffset;
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unsigned bitsEnd;
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public:
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// Read 1-32 bits from the stream into *value. Returns true on success
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bool read(unsigned * value, unsigned bits);
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// Read 1-32 bits from stream. Returns 'default' on failure.
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unsigned readOrDefault(unsigned bits, unsigned defaultValue);
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// Skip bits until we're aligned to the power of two alignment
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bool align(unsigned align);
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unsigned offset();
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Buffer * buffer();
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BitStreamReader(Buffer * buffer, unsigned bitsOffset, unsigned bitsCount);
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};
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//
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// Bitstream writer interface
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//
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class BitStreamWriter
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{
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Buffer * targetBuffer;
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unsigned bitsOffset;
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public:
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//
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// Create a bitstream writer at a specific bit offset
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// into an already existing buffer
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//
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BitStreamWriter(Buffer * buffer, unsigned bitsOffset = 0);
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//
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// Write n bits to the buffer in big endian format.
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// No buffering is performed.
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//
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bool write(unsigned value, unsigned bits);
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//
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// Emit zero's until the offset is divisible by align.
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// CAVEAT: align must be a power of 2 (eg 8)
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//
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bool align(unsigned align);
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//
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// Get current offset and buffer target
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//
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unsigned offset();
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Buffer * buffer();
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};
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}
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#endif //INCLUDED_DP_BITSTREAM_H
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