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using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace Ryujinx.Common.Memory
{
public ref struct SpanReader
{
private ReadOnlySpan<byte> _input;
public int Length => _input.Length;
public SpanReader(ReadOnlySpan<byte> input)
{
_input = input;
}
public T Read<T>() where T : unmanaged
{
T value = MemoryMarshal.Cast<byte, T>(_input)[0];
_input = _input.Slice(Unsafe.SizeOf<T>());
return value;
}
public bool TryRead<T>(out T value) where T : unmanaged
{
int valueSize = Unsafe.SizeOf<T>();
if (valueSize > _input.Length)
{
value = default;
return false;
}
value = MemoryMarshal.Cast<byte, T>(_input)[0];
_input = _input.Slice(valueSize);
return true;
}
public ReadOnlySpan<byte> GetSpan(int size)
{
ReadOnlySpan<byte> data = _input.Slice(0, size);
_input = _input.Slice(size);
return data;
}
public ReadOnlySpan<byte> GetSpanSafe(int size)
{
return GetSpan((int)Math.Min((uint)_input.Length, (uint)size));
}
public T ReadAt<T>(int offset) where T : unmanaged
{
return MemoryMarshal.Cast<byte, T>(_input.Slice(offset))[0];
}
public ReadOnlySpan<byte> GetSpanAt(int offset, int size)
{
return _input.Slice(offset, size);
}
public void Skip(int size)
{
_input = _input.Slice(size);
}
}
}
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