BinHexEncoder.cs

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using System.Threading.Tasks;
 
namespace System.Xml;
 
internal static class BinHexEncoder
{
    internal static void Encode(byte[] buffer, int index, int count, XmlWriter writer)
    {
        if (buffer == null)
        {
            throw new ArgumentNullException("buffer");
        }
        if (index < 0)
        {
            throw new ArgumentOutOfRangeException("index");
        }
        if (count < 0)
        {
            throw new ArgumentOutOfRangeException("count");
        }
        if (count > buffer.Length - index)
        {
            throw new ArgumentOutOfRangeException("count");
        }
        char[] array = new char[(count * 2 < 128) ? (count * 2) : 128];
        int num = index + count;
        while (index < num)
        {
            int num2 = ((count < 64) ? count : 64);
            System.HexConverter.EncodeToUtf16(buffer.AsSpan(index, num2), array);
            writer.WriteRaw(array, 0, num2 * 2);
            index += num2;
            count -= num2;
        }
    }
 
    internal static string Encode(byte[] inArray, int offsetIn, int count)
    {
        return Convert.ToHexString(inArray, offsetIn, count);
    }
 
    internal static async Task EncodeAsync(byte[] buffer, int index, int count, XmlWriter writer)
    {
        if (buffer == null)
        {
            throw new ArgumentNullException("buffer");
        }
        if (index < 0)
        {
            throw new ArgumentOutOfRangeException("index");
        }
        if (count < 0)
        {
            throw new ArgumentOutOfRangeException("count");
        }
        if (count > buffer.Length - index)
        {
            throw new ArgumentOutOfRangeException("count");
        }
        char[] chars = new char[(count * 2 < 128) ? (count * 2) : 128];
        int endIndex = index + count;
        while (index < endIndex)
        {
            int cnt = ((count < 64) ? count : 64);
            System.HexConverter.EncodeToUtf16(buffer.AsSpan(index, cnt), chars);
            await writer.WriteRawAsync(chars, 0, cnt * 2).ConfigureAwait(continueOnCapturedContext: false);
            index += cnt;
            count -= cnt;
        }
    }
}