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