aaru-dps/Aaru.Checksums
1
0
Fork 0
mirror of https://github.com/aaru-dps/Aaru.Checksums.git synced 2025-12-16 19:24:29 +00:00
Code Issues Packages Projects Releases Wiki Activity

Implement Fletcher-32 using ARM NEON instructions.

Browse Source
This commit is contained in:
Natalia Portillo
2023-09-24 20:49:46 +01:00
parent ab14e00252
commit 05ea7f75fa
2 changed files with 253 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

51
FletcherContext.cs
View File

@@ -35,7 +35,9 @@
using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.Intrinsics.Arm;
using System.Text;
using Aaru.Checksums.Fletcher32;
using Aaru.CommonTypes.Interfaces;
using Aaru.Helpers;
@@ -45,11 +47,11 @@ namespace Aaru.Checksums;
/// <summary>Implements the Fletcher-32 algorithm</summary>
public sealed class Fletcher32Context : IChecksum
{
const ushort FLETCHER_MODULE = 0xFFFF;
const uint NMAX = 5552;
readonly IntPtr _nativeContext;
readonly bool _useNative;
ushort _sum1, _sum2;
internal const ushort FLETCHER_MODULE = 0xFFFF;
internal const uint NMAX = 5552;
readonly IntPtr _nativeContext;
readonly bool _useNative;
ushort _sum1, _sum2;
/// <summary>Initializes the Fletcher-32 sums</summary>
public Fletcher32Context()
@@ -79,7 +81,7 @@ public sealed class Fletcher32Context : IChecksum
/// <summary>Returns a byte array of the hash value.</summary>
public byte[] Final()
{
var finalSum = (uint)((_sum2 << 16) | _sum1);
uint finalSum = (uint)((_sum2 << 16) | _sum1);
if(!_useNative)
return BigEndianBitConverter.GetBytes(finalSum);
@@ -94,7 +96,7 @@ public sealed class Fletcher32Context : IChecksum
/// <summary>Returns a hexadecimal representation of the hash value.</summary>
public string End()
{
var finalSum = (uint)((_sum2 << 16) | _sum1);
uint finalSum = (uint)((_sum2 << 16) | _sum1);
if(_useNative)
{
@@ -104,7 +106,7 @@ public sealed class Fletcher32Context : IChecksum
var fletcherOutput = new StringBuilder();
for(var i = 0; i < BigEndianBitConverter.GetBytes(finalSum).Length; i++)
for(int i = 0; i < BigEndianBitConverter.GetBytes(finalSum).Length; i++)
fletcherOutput.Append(BigEndianBitConverter.GetBytes(finalSum)[i].ToString("x2"));
return fletcherOutput.ToString();
@@ -132,9 +134,16 @@ public sealed class Fletcher32Context : IChecksum
return;
}
if(AdvSimd.IsSupported)
{
Neon.Step(ref previousSum1, ref previousSum2, data, len);
return;
}
uint sum1 = previousSum1;
uint sum2 = previousSum2;
var dataOff = 0;
int dataOff = 0;
switch(len)
{
@@ -312,8 +321,8 @@ public sealed class Fletcher32Context : IChecksum
ushort localSum1 = 0xFFFF;
ushort localSum2 = 0xFFFF;
var buffer = new byte[65536];
int read = fileStream.EnsureRead(buffer, 0, 65536);
byte[] buffer = new byte[65536];
int read = fileStream.EnsureRead(buffer, 0, 65536);
while(read > 0)
{
@@ -322,7 +331,7 @@ public sealed class Fletcher32Context : IChecksum
read = fileStream.EnsureRead(buffer, 0, 65536);
}
var finalSum = (uint)((localSum2 << 16) | localSum1);
uint finalSum = (uint)((localSum2 << 16) | localSum1);
if(useNative)
{
@@ -364,7 +373,7 @@ public sealed class Fletcher32Context : IChecksum
Step(ref localSum1, ref localSum2, data, len, useNative, nativeContext);
var finalSum = (uint)((localSum2 << 16) | localSum1);
uint finalSum = (uint)((localSum2 << 16) | localSum1);
if(useNative)
{
@@ -427,7 +436,7 @@ public sealed class Fletcher16Context : IChecksum
/// <summary>Returns a byte array of the hash value.</summary>
public byte[] Final()
{
var finalSum = (ushort)((_sum2 << 8) | _sum1);
ushort finalSum = (ushort)((_sum2 << 8) | _sum1);
if(!_useNative)
return BigEndianBitConverter.GetBytes(finalSum);
@@ -442,7 +451,7 @@ public sealed class Fletcher16Context : IChecksum
/// <summary>Returns a hexadecimal representation of the hash value.</summary>
public string End()
{
var finalSum = (ushort)((_sum2 << 8) | _sum1);
ushort finalSum = (ushort)((_sum2 << 8) | _sum1);
if(_useNative)
{
@@ -452,7 +461,7 @@ public sealed class Fletcher16Context : IChecksum
var fletcherOutput = new StringBuilder();
for(var i = 0; i < BigEndianBitConverter.GetBytes(finalSum).Length; i++)
for(int i = 0; i < BigEndianBitConverter.GetBytes(finalSum).Length; i++)
fletcherOutput.Append(BigEndianBitConverter.GetBytes(finalSum)[i].ToString("x2"));
return fletcherOutput.ToString();
@@ -482,7 +491,7 @@ public sealed class Fletcher16Context : IChecksum
uint sum1 = previousSum1;
uint sum2 = previousSum2;
var dataOff = 0;
int dataOff = 0;
switch(len)
{
@@ -640,8 +649,8 @@ public sealed class Fletcher16Context : IChecksum
byte localSum1 = 0xFF;
byte localSum2 = 0xFF;
var buffer = new byte[65536];
int read = fileStream.EnsureRead(buffer, 0, 65536);
byte[] buffer = new byte[65536];
int read = fileStream.EnsureRead(buffer, 0, 65536);
while(read > 0)
{
@@ -650,7 +659,7 @@ public sealed class Fletcher16Context : IChecksum
read = fileStream.EnsureRead(buffer, 0, 65536);
}
var finalSum = (ushort)((localSum2 << 8) | localSum1);
ushort finalSum = (ushort)((localSum2 << 8) | localSum1);
if(useNative)
{
@@ -692,7 +701,7 @@ public sealed class Fletcher16Context : IChecksum
Step(ref localSum1, ref localSum2, data, len, useNative, nativeContext);
var finalSum = (ushort)((localSum2 << 8) | localSum1);
ushort finalSum = (ushort)((localSum2 << 8) | localSum1);
if(useNative)
{