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using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace Ryujinx.Horizon.Sdk.Ngc.Detail
{
ref struct BinaryReader
{
private readonly ReadOnlySpan<byte> _data;
private int _offset;
public BinaryReader(ReadOnlySpan<byte> data)
{
_data = data;
}
public bool Read<T>(out T value) where T : unmanaged
{
int byteLength = Unsafe.SizeOf<T>();
if ((uint)(_offset + byteLength) <= (uint)_data.Length)
{
value = MemoryMarshal.Cast<byte, T>(_data[_offset..])[0];
_offset += byteLength;
return true;
}
value = default;
return false;
}
public int AllocateAndReadArray<T>(ref T[] array, int length, int maxLengthExclusive) where T : unmanaged
{
return AllocateAndReadArray(ref array, Math.Min(length, maxLengthExclusive));
}
public int AllocateAndReadArray<T>(ref T[] array, int length) where T : unmanaged
{
array = new T[length];
return ReadArray(array);
}
public int ReadArray<T>(T[] array) where T : unmanaged
{
if (array != null)
{
int byteLength = array.Length * Unsafe.SizeOf<T>();
byteLength = Math.Min(byteLength, _data.Length - _offset);
MemoryMarshal.Cast<byte, T>(_data.Slice(_offset, byteLength)).CopyTo(array);
_offset += byteLength;
return byteLength / Unsafe.SizeOf<T>();
}
return 0;
}
}
}
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