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Ottermandias 2022-02-27 00:04:01 +01:00
parent e15d844d4b
commit 0e8f839471
5 changed files with 812 additions and 140 deletions
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63
Penumbra.GameData/Util/Functions.cs Normal file
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using System;
using System.Runtime.InteropServices;
namespace Penumbra.GameData.Util;
public static class Functions
{
public static ulong ComputeCrc64( string name )
{
if( name.Length == 0 )
{
return 0;
}
var lastSlash = name.LastIndexOf( '/' );
if( lastSlash == -1 )
{
return Lumina.Misc.Crc32.Get( name );
}
var folder = name[ ..lastSlash ];
var file = name[ ( lastSlash + 1 ).. ];
return ( ( ulong )Lumina.Misc.Crc32.Get( folder ) << 32 ) | Lumina.Misc.Crc32.Get( file );
}
public static ulong ComputeCrc64( ReadOnlySpan< byte > name )
{
if( name.Length == 0 )
{
return 0;
}
var lastSlash = name.LastIndexOf( ( byte )'/' );
if( lastSlash == -1 )
{
return Lumina.Misc.Crc32.Get( name );
}
var folder = name[ ..lastSlash ];
var file = name[ ( lastSlash + 1 ).. ];
return ( ( ulong )Lumina.Misc.Crc32.Get( folder ) << 32 ) | Lumina.Misc.Crc32.Get( file );
}
[DllImport( "msvcrt.dll", EntryPoint = "memcpy", CallingConvention = CallingConvention.Cdecl, SetLastError = false )]
private static extern unsafe IntPtr memcpy( byte* dest, byte* src, int count );
public static unsafe void MemCpyUnchecked( byte* dest, byte* src, int count )
=> memcpy( dest, src, count );
[DllImport( "msvcrt.dll", EntryPoint = "memcmp", CallingConvention = CallingConvention.Cdecl, SetLastError = false )]
private static extern unsafe int memcmp( byte* b1, byte* b2, int count );
public static unsafe int MemCmpUnchecked( byte* ptr1, byte* ptr2, int count )
=> memcmp( ptr1, ptr2, count );
[DllImport( "msvcrt.dll", EntryPoint = "_memicmp", CallingConvention = CallingConvention.Cdecl, SetLastError = false )]
private static extern unsafe int memicmp( byte* b1, byte* b2, int count );
public static unsafe int MemCmpCaseInsensitiveUnchecked( byte* ptr1, byte* ptr2, int count )
=> memicmp( ptr1, ptr2, count );
}