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using Microsoft.IO;
using Ryujinx.Common.Memory;
using Ryujinx.Memory;
using System;
using System.IO;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Text;
namespace Ryujinx.Cpu
{
public static class MemoryHelper
{
public static void FillWithZeros(IVirtualMemoryManager memory, ulong position, int size)
{
int size8 = size & ~(8 - 1);
for (int offs = 0; offs < size8; offs += 8)
{
memory.Write<long>(position + (ulong)offs, 0);
}
for (int offs = size8; offs < (size - size8); offs++)
{
memory.Write<byte>(position + (ulong)offs, 0);
}
}
public unsafe static T Read<T>(IVirtualMemoryManager memory, ulong position) where T : unmanaged
{
return MemoryMarshal.Cast<byte, T>(memory.GetSpan(position, Unsafe.SizeOf<T>()))[0];
}
public unsafe static ulong Write<T>(IVirtualMemoryManager memory, ulong position, T value) where T : unmanaged
{
ReadOnlySpan<byte> data = MemoryMarshal.Cast<T, byte>(MemoryMarshal.CreateReadOnlySpan(ref value, 1));
memory.Write(position, data);
return (ulong)data.Length;
}
public static string ReadAsciiString(IVirtualMemoryManager memory, ulong position, long maxSize = -1)
{
using (RecyclableMemoryStream ms = MemoryStreamManager.Shared.GetStream())
{
for (long offs = 0; offs < maxSize || maxSize == -1; offs++)
{
byte value = memory.Read<byte>(position + (ulong)offs);
if (value == 0)
{
break;
}
ms.WriteByte(value);
}
return Encoding.ASCII.GetString(ms.GetReadOnlySequence());
}
}
}
}
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