.NET Signature Stream Utility class

SignatureUtil.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Signatures
{
    /// <summary>
    /// Line drawing commands as generated by the Signature Pad JSON export option.
    /// </summary>
    public struct SignatureLine
    {
        public int lx;
        public int ly;
        public int mx;
        public int my;
    }
    
    public static class SignatureUtil
    {
         public static void WriteSignature(Stream outputStream, SignatureLine[] lines)
        {
            BinaryWriter writer = new BinaryWriter(outputStream);
            writer.Write(lines.Length); // First int is the length of the line segments
            for (int i = 0; i < lines.Length; i++)
            {
                var line = lines[i];                    
                writer.Write(line.lx);
                writer.Write(line.ly);
                writer.Write(line.mx);
                writer.Write(line.my);
            }
            writer.Flush();
            
        }

        public static SignatureLine[] ReadSignature(Stream inputStream)
        {
            int index = 0;
            BinaryReader reader = new BinaryReader(inputStream);
            
            inputStream.Seek(0, SeekOrigin.Begin);
            int length = reader.ReadInt32();
            var lines = new SignatureLine[length];
            byte mode = 0;
            int val;
            while (inputStream.Position < inputStream.Length)
            {
                val = reader.ReadInt32();
                switch (mode)
                {
                    case 0:
                        lines[index].lx = val;
                        break;
                    case 1:
                        lines[index].ly = val; 
                        break;
                    case 2:
                        lines[index].mx = val;
                        break;
                    case 3:
                        lines[index].my = val;
                        break;                        
                }
                mode = (byte)(((int)mode+1) % 4);
                if (mode == 0)
                    index++;
            }
            return lines;
        }

        
        
    }
}