73 lines
2.8 KiB
C++
73 lines
2.8 KiB
C++
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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
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// are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * 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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// * Neither the name of NVIDIA CORPORATION nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Copyright (c) 2008-2025 NVIDIA Corporation. All rights reserved.
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// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
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// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
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#include "OmniPvdHelpers.h"
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uint8_t OmniPvdCompressInt(uint64_t handle, uint8_t *bytes) {
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uint8_t lastBitGroupIndex = 0;
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uint8_t shiftBits = 0;
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for (int i = 0; i < 8; i++) {
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if ((handle >> shiftBits) & 0x7f) {
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lastBitGroupIndex = static_cast<uint8_t>(i);
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}
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shiftBits += 7;
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}
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shiftBits = 0;
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for (int i = 0; i <= lastBitGroupIndex; i++) {
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uint8_t currentBitGroup = (handle >> shiftBits) & 0x7f;
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if (i < lastBitGroupIndex) {
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currentBitGroup |= 0x80; // Set the continuation flag bit to true
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}
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bytes[i] = currentBitGroup;
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shiftBits += 7;
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}
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return lastBitGroupIndex;
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}
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uint64_t OmniPvdDeCompressInt(uint8_t *bytes, uint8_t maxBytes) {
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if (maxBytes > 8) {
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maxBytes = 8;
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}
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uint64_t decompressedInt = 0;
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uint8_t continueFlag = 1;
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uint8_t readBytes = 0;
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uint8_t shiftBits = 0;
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while (continueFlag && (readBytes < maxBytes)) {
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const uint8_t currentByte = *bytes;
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uint64_t decompressedBits = currentByte & 0x7f;
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continueFlag = currentByte & 0x80;
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decompressedInt |= (decompressedBits << shiftBits);
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shiftBits += 7;
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if (continueFlag) {
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bytes++;
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}
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}
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return decompressedInt;
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}
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