ASEv1CaptureFileRecovery.cs

using System;
using System.IO;

namespace ASECaptureRepair
{
    class Program
    {
        static void Main(string[] args)
        {
            string fileName = args[0];
            if (File.Exists(fileName))
            {
                int messageCount = 0;
                int newAddress;
                byte[] address = new byte[4];
                var file = File.Open(fileName, FileMode.Open, FileAccess.ReadWrite);

                try
                {
                    file.Seek(0x100, SeekOrigin.Begin);
                    file.Read(address, 0, 4);
                    messageCount++;
                    newAddress = byte2int(address);

                    while (newAddress < file.Length & newAddress != 0)
                    {
                        file.Seek(newAddress, SeekOrigin.Begin);
                        file.Read(address, 0, 4);
                        messageCount++;
                        newAddress = byte2int(address);
                    }

                    Console.WriteLine(String.Format("Counted {0} messages, attempting to correct header...", messageCount));
                    file.Seek(0xC, SeekOrigin.Begin);
                    file.Write(int2byte(messageCount), 0, 4);
                    file.Seek(0x18, SeekOrigin.Begin);
                    file.Write(int2byte(messageCount), 0, 4);
                    file.Seek(0x1C, SeekOrigin.Begin);
                    file.Write(int2byte(messageCount + 1), 0, 4);
                    Console.WriteLine("Done.");
                }
                catch (Exception ex)
                {
                    Console.Write(ex.ToString());
               } 
            }
            else
            {
                Console.WriteLine("File does not exist.");
            }
            Console.WriteLine("Press any key to exit...");
            Console.ReadKey();
        }

        static int byte2int(byte[] bytes)
        {
            return bytes[3] << 24 | bytes[2] << 16 | bytes[1] << 8 | bytes[0];
        }

        static byte[] int2byte(int i)
        {
            byte[] intBytes = BitConverter.GetBytes(i);
            if (!BitConverter.IsLittleEndian)
                Array.Reverse(intBytes);
            return intBytes;
        }
    }
}