EncodingHelper.cs

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using System.Buffers;
using System.Reflection.Metadata;
using System.Runtime.InteropServices;
 
namespace System.Reflection.Internal;
 
internal static class EncodingHelper
{
    internal static bool TestOnly_LightUpEnabled
    {
        get
        {
            return true;
        }
        set
        {
        }
    }
 
    public unsafe static string DecodeUtf8(byte* bytes, int byteCount, byte[]? prefix, MetadataStringDecoder utf8Decoder)
    {
        if (prefix != null)
        {
            return DecodeUtf8Prefixed(bytes, byteCount, prefix, utf8Decoder);
        }
        if (byteCount == 0)
        {
            return string.Empty;
        }
        return utf8Decoder.GetString(bytes, byteCount);
    }
 
    private unsafe static string DecodeUtf8Prefixed(byte* bytes, int byteCount, byte[] prefix, MetadataStringDecoder utf8Decoder)
    {
        int num = byteCount + prefix.Length;
        if (num == 0)
        {
            return string.Empty;
        }
        byte[] array = ArrayPool<byte>.Shared.Rent(num);
        prefix.CopyTo(array, 0);
        Marshal.Copy((IntPtr)bytes, array, prefix.Length, byteCount);
        string @string;
        fixed (byte* bytes2 = &array[0])
        {
            @string = utf8Decoder.GetString(bytes2, num);
        }
        ArrayPool<byte>.Shared.Return(array);
        return @string;
    }
}