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83 lines
2.3 KiB
C#
83 lines
2.3 KiB
C#
using System;
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using System.IO;
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using System.Runtime.InteropServices;
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using System.Text;
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namespace ChocolArm64.Memory
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{
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public static class AMemoryHelper
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{
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public static void FillWithZeros(AMemory Memory, long Position, int Size)
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{
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int Size8 = Size & ~(8 - 1);
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for (int Offs = 0; Offs < Size8; Offs += 8)
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{
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Memory.WriteInt64(Position + Offs, 0);
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}
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for (int Offs = Size8; Offs < (Size - Size8); Offs++)
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{
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Memory.WriteByte(Position + Offs, 0);
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}
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}
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public unsafe static T Read<T>(AMemory Memory, long Position) where T : struct
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{
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long Size = Marshal.SizeOf<T>();
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if ((ulong)(Position + Size) > AMemoryMgr.AddrSize)
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{
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throw new ArgumentOutOfRangeException(nameof(Position));
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}
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IntPtr Ptr = new IntPtr((byte*)Memory.Ram + Position);
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return Marshal.PtrToStructure<T>(Ptr);
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}
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public unsafe static void Write<T>(AMemory Memory, long Position, T Value) where T : struct
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{
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long Size = Marshal.SizeOf<T>();
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if ((ulong)(Position + Size) > AMemoryMgr.AddrSize)
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{
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throw new ArgumentOutOfRangeException(nameof(Position));
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}
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IntPtr Ptr = new IntPtr((byte*)Memory.Ram + Position);
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Marshal.StructureToPtr<T>(Value, Ptr, false);
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}
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public static string ReadAsciiString(AMemory Memory, long Position, long MaxSize = -1)
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{
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using (MemoryStream MS = new MemoryStream())
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{
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for (long Offs = 0; Offs < MaxSize || MaxSize == -1; Offs++)
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{
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byte Value = (byte)Memory.ReadByte(Position + Offs);
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if (Value == 0)
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{
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break;
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}
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MS.WriteByte(Value);
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}
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return Encoding.ASCII.GetString(MS.ToArray());
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}
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}
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public static long PageRoundUp(long Value)
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{
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return (Value + AMemoryMgr.PageMask) & ~AMemoryMgr.PageMask;
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}
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public static long PageRoundDown(long Value)
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{
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return Value & ~AMemoryMgr.PageMask;
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}
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}
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} |