mirror of
https://github.com/claunia/romrepomgr.git
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132 lines
5.0 KiB
C#
132 lines
5.0 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : arm_simd.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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// The Chromium Authors
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//
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// Component : Checksums.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Compute CRC32 checksum using ARM special instructions..
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//
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// --[ License ] --------------------------------------------------------------
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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
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// met:
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//
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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
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY 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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// ----------------------------------------------------------------------------
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// Copyright © 2011-2025 Natalia Portillo
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// Copyright 2017 The Chromium Authors. All rights reserved.
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// ****************************************************************************/
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using System;
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using System.Runtime.Intrinsics.Arm;
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namespace RomRepoMgr.Core.Checksums.CRC32;
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static class ArmSimd
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{
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internal static uint Step64(byte[] buf, long len, uint crc)
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{
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uint c = crc;
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int bufPos = 0;
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while(len >= 64)
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{
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c = Crc32.Arm64.ComputeCrc32(c, BitConverter.ToUInt64(buf, bufPos));
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bufPos += 8;
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c = Crc32.Arm64.ComputeCrc32(c, BitConverter.ToUInt64(buf, bufPos));
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bufPos += 8;
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c = Crc32.Arm64.ComputeCrc32(c, BitConverter.ToUInt64(buf, bufPos));
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bufPos += 8;
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c = Crc32.Arm64.ComputeCrc32(c, BitConverter.ToUInt64(buf, bufPos));
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bufPos += 8;
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c = Crc32.Arm64.ComputeCrc32(c, BitConverter.ToUInt64(buf, bufPos));
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bufPos += 8;
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c = Crc32.Arm64.ComputeCrc32(c, BitConverter.ToUInt64(buf, bufPos));
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bufPos += 8;
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c = Crc32.Arm64.ComputeCrc32(c, BitConverter.ToUInt64(buf, bufPos));
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bufPos += 8;
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c = Crc32.Arm64.ComputeCrc32(c, BitConverter.ToUInt64(buf, bufPos));
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bufPos += 8;
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len -= 64;
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}
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while(len >= 8)
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{
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c = Crc32.Arm64.ComputeCrc32(c, BitConverter.ToUInt64(buf, bufPos));
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bufPos += 8;
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len -= 8;
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}
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while(len-- > 0) c = Crc32.ComputeCrc32(c, buf[bufPos++]);
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return c;
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}
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internal static uint Step32(byte[] buf, long len, uint crc)
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{
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uint c = crc;
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int bufPos = 0;
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while(len >= 32)
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{
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c = Crc32.ComputeCrc32(c, BitConverter.ToUInt32(buf, bufPos));
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bufPos += 4;
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c = Crc32.ComputeCrc32(c, BitConverter.ToUInt32(buf, bufPos));
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bufPos += 4;
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c = Crc32.ComputeCrc32(c, BitConverter.ToUInt32(buf, bufPos));
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bufPos += 4;
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c = Crc32.ComputeCrc32(c, BitConverter.ToUInt32(buf, bufPos));
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bufPos += 4;
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c = Crc32.ComputeCrc32(c, BitConverter.ToUInt32(buf, bufPos));
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bufPos += 4;
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c = Crc32.ComputeCrc32(c, BitConverter.ToUInt32(buf, bufPos));
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bufPos += 4;
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c = Crc32.ComputeCrc32(c, BitConverter.ToUInt32(buf, bufPos));
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bufPos += 4;
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c = Crc32.ComputeCrc32(c, BitConverter.ToUInt32(buf, bufPos));
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bufPos += 4;
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len -= 32;
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}
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while(len >= 4)
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{
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c = Crc32.ComputeCrc32(c, BitConverter.ToUInt32(buf, bufPos));
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bufPos += 4;
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len -= 4;
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}
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while(len-- > 0) c = Crc32.ComputeCrc32(c, buf[bufPos++]);
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return c;
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}
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} |