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ryujinx-final/Ryujinx.HLE/Loaders/Mods/IPSPatcher.cs
Ac_K 5d08e9b495
hos: Cleanup the project (#2634)
* hos: Cleanup the project

Since a lot of changes has been done on the HOS project, there are some leftover here and there, or class just used in one service, things at wrong places, and more.
This PR fixes that, additionnally to that, I've realigned some vars because I though it make the code more readable.

* Address gdkchan feedback

* addresses Thog feedback

* Revert ElfSymbol
2021-09-15 01:24:49 +02:00

117 lines
No EOL
3.1 KiB
C#

using Ryujinx.Common.Logging;
using System;
using System.IO;
using System.Text;
namespace Ryujinx.HLE.Loaders.Mods
{
class IpsPatcher
{
MemPatch _patches;
public IpsPatcher(BinaryReader reader)
{
_patches = ParseIps(reader);
if (_patches != null)
{
Logger.Info?.Print(LogClass.ModLoader, "IPS patch loaded successfully");
}
}
private static MemPatch ParseIps(BinaryReader reader)
{
Span<byte> IpsHeaderMagic = Encoding.ASCII.GetBytes("PATCH").AsSpan();
Span<byte> IpsTailMagic = Encoding.ASCII.GetBytes("EOF").AsSpan();
Span<byte> Ips32HeaderMagic = Encoding.ASCII.GetBytes("IPS32").AsSpan();
Span<byte> Ips32TailMagic = Encoding.ASCII.GetBytes("EEOF").AsSpan();
MemPatch patches = new MemPatch();
var header = reader.ReadBytes(IpsHeaderMagic.Length).AsSpan();
if (header.Length != IpsHeaderMagic.Length)
{
return null;
}
bool is32;
Span<byte> tailSpan;
if (header.SequenceEqual(IpsHeaderMagic))
{
is32 = false;
tailSpan = IpsTailMagic;
}
else if (header.SequenceEqual(Ips32HeaderMagic))
{
is32 = true;
tailSpan = Ips32TailMagic;
}
else
{
return null;
}
byte[] buf = new byte[tailSpan.Length];
bool ReadNext(int size) => reader.Read(buf, 0, size) != size;
while (true)
{
if (ReadNext(buf.Length))
{
return null;
}
if (buf.AsSpan().SequenceEqual(tailSpan))
{
break;
}
int patchOffset = is32 ? buf[0] << 24 | buf[1] << 16 | buf[2] << 8 | buf[3]
: buf[0] << 16 | buf[1] << 8 | buf[2];
if (ReadNext(2))
{
return null;
}
int patchSize = buf[0] << 8 | buf[1];
if (patchSize == 0) // RLE/Fill mode
{
if (ReadNext(2))
{
return null;
}
int fillLength = buf[0] << 8 | buf[1];
if (ReadNext(1))
{
return null;
}
patches.AddFill((uint)patchOffset, fillLength, buf[0]);
}
else // Copy mode
{
var patch = reader.ReadBytes(patchSize);
if (patch.Length != patchSize)
{
return null;
}
patches.Add((uint)patchOffset, patch);
}
}
return patches;
}
public void AddPatches(MemPatch patches)
{
patches.AddFrom(_patches);
}
}
}