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using Ryujinx.Common;
using Ryujinx.Common.Utilities;
using Ryujinx.HLE.HOS.Services.SurfaceFlinger.Types;
using System;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Text;
namespace Ryujinx.HLE.HOS.Services.SurfaceFlinger
{
class Parcel
{
private readonly byte[] _rawData;
private Span<byte> Raw => new(_rawData);
private ref ParcelHeader Header => ref MemoryMarshal.Cast<byte, ParcelHeader>(_rawData)[0];
private Span<byte> Payload => Raw.Slice((int)Header.PayloadOffset, (int)Header.PayloadSize);
private Span<byte> Objects => Raw.Slice((int)Header.ObjectOffset, (int)Header.ObjectsSize);
private int _payloadPosition;
private int _objectPosition;
public Parcel(byte[] rawData)
{
_rawData = rawData;
_payloadPosition = 0;
_objectPosition = 0;
}
public Parcel(uint payloadSize, uint objectsSize)
{
uint headerSize = (uint)Unsafe.SizeOf<ParcelHeader>();
_rawData = new byte[BitUtils.AlignUp<uint>(headerSize + payloadSize + objectsSize, 4)];
Header.PayloadSize = payloadSize;
Header.ObjectsSize = objectsSize;
Header.PayloadOffset = headerSize;
Header.ObjectOffset = Header.PayloadOffset + Header.ObjectsSize;
}
public string ReadInterfaceToken()
{
// Ignore the policy flags
#pragma warning disable IDE0059 // Remove unnecessary value assignment
int strictPolicy = ReadInt32();
#pragma warning restore IDE0059
return ReadString16();
}
public string ReadString16()
{
int size = ReadInt32();
if (size < 0)
{
return "";
}
ReadOnlySpan<byte> data = ReadInPlace((size + 1) * 2);
// Return the unicode string without the last character (null terminator)
return Encoding.Unicode.GetString(data[..(size * 2)]);
}
public int ReadInt32() => ReadUnmanagedType<int>();
public uint ReadUInt32() => ReadUnmanagedType<uint>();
public bool ReadBoolean() => ReadUnmanagedType<uint>() != 0;
public long ReadInt64() => ReadUnmanagedType<long>();
public ulong ReadUInt64() => ReadUnmanagedType<ulong>();
public T ReadFlattenable<T>() where T : unmanaged, IFlattenable
{
long flattenableSize = ReadInt64();
T result = new();
Debug.Assert(flattenableSize == result.GetFlattenedSize());
result.Unflatten(this);
return result;
}
public T ReadUnmanagedType<T>() where T : unmanaged
{
ReadOnlySpan<byte> data = ReadInPlace(Unsafe.SizeOf<T>());
return MemoryMarshal.Cast<byte, T>(data)[0];
}
public ReadOnlySpan<byte> ReadInPlace(int size)
{
ReadOnlySpan<byte> result = Payload.Slice(_payloadPosition, size);
_payloadPosition += BitUtils.AlignUp(size, 4);
return result;
}
[StructLayout(LayoutKind.Sequential, Size = 0x28)]
private struct FlatBinderObject
{
public int Type;
public int Flags;
public long BinderId;
public long Cookie;
private byte _serviceNameStart;
public Span<byte> ServiceName => MemoryMarshal.CreateSpan(ref _serviceNameStart, 0x8);
}
public void WriteObject<T>(T obj, string serviceName) where T : IBinder
{
FlatBinderObject flatBinderObject = new()
{
Type = 2,
Flags = 0,
BinderId = HOSBinderDriverServer.GetBinderId(obj),
};
Encoding.ASCII.GetBytes(serviceName).CopyTo(flatBinderObject.ServiceName);
WriteUnmanagedType(ref flatBinderObject);
// TODO: figure out what this value is
WriteInplaceObject(new byte[4] { 0, 0, 0, 0 });
}
public AndroidStrongPointer<T> ReadStrongPointer<T>() where T : unmanaged, IFlattenable
{
bool hasObject = ReadBoolean();
if (hasObject)
{
T obj = ReadFlattenable<T>();
return new AndroidStrongPointer<T>(obj);
}
else
{
return new AndroidStrongPointer<T>();
}
}
public void WriteStrongPointer<T>(ref AndroidStrongPointer<T> value) where T : unmanaged, IFlattenable
{
WriteBoolean(!value.IsNull);
if (!value.IsNull)
{
WriteFlattenable<T>(ref value.Object);
}
}
public void WriteFlattenable<T>(ref T value) where T : unmanaged, IFlattenable
{
WriteInt64(value.GetFlattenedSize());
value.Flatten(this);
}
public void WriteStatus(Status status) => WriteUnmanagedType(ref status);
public void WriteBoolean(bool value) => WriteUnmanagedType(ref value);
public void WriteInt32(int value) => WriteUnmanagedType(ref value);
public void WriteUInt32(uint value) => WriteUnmanagedType(ref value);
public void WriteInt64(long value) => WriteUnmanagedType(ref value);
public void WriteUInt64(ulong value) => WriteUnmanagedType(ref value);
public void WriteUnmanagedSpan<T>(ReadOnlySpan<T> value) where T : unmanaged
{
WriteInplace(MemoryMarshal.Cast<T, byte>(value));
}
public void WriteUnmanagedType<T>(ref T value) where T : unmanaged
{
WriteInplace(SpanHelpers.AsByteSpan(ref value));
}
public void WriteInplace(ReadOnlySpan<byte> data)
{
Span<byte> result = Payload.Slice(_payloadPosition, data.Length);
data.CopyTo(result);
_payloadPosition += BitUtils.AlignUp(data.Length, 4);
}
public void WriteInplaceObject(ReadOnlySpan<byte> data)
{
Span<byte> result = Objects.Slice(_objectPosition, data.Length);
data.CopyTo(result);
_objectPosition += BitUtils.AlignUp(data.Length, 4);
}
private void UpdateHeader()
{
uint headerSize = (uint)Unsafe.SizeOf<ParcelHeader>();
Header.PayloadSize = (uint)_payloadPosition;
Header.ObjectsSize = (uint)_objectPosition;
Header.PayloadOffset = headerSize;
Header.ObjectOffset = Header.PayloadOffset + Header.PayloadSize;
}
public ReadOnlySpan<byte> Finish()
{
UpdateHeader();
return Raw[..(int)(Header.PayloadSize + Header.ObjectsSize + Unsafe.SizeOf<ParcelHeader>())];
}
}
}
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