Ryujinx.Common/Memory/SpanReader.cs


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51

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 ReadOnlySpan<byte> GetSpan(int size)
        {
            ReadOnlySpan<byte> data = _input.Slice(0, size);

            _input = _input.Slice(size);

            return data;
        }

        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);
        }
    }
}