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Hexdump console application to be refactored
using System;
using System.IO;
using System.Text;
namespace hexdump
{
// source: "C# von Kopf bis Fuß", O'Reilly, see also https://app.box.com/s/a9n6kipfdonr5yeo44ha
class MainClass
{
public static void Main (string[] args)
{
if (args.Length != 1) {
Console.Error.WriteLine ("Usage: hexdump <dateiname>");
Environment.Exit (1);
}
if (!File.Exists(args[0])) {
Console.Error.WriteLine("No such file: {0}", args[0]);
Environment.Exit(2);
}
using (var input = File.OpenRead (args [0])) {
int position = 0;
var buffer = new byte[16];
while (position < input.Length) {
var charsRead = input.Read (buffer, 0, buffer.Length);
if (charsRead > 0) {
Console.Write ("{0}: ", string.Format ("{0:x4}", position));
position += charsRead;
for (int i = 0; i < 16; i++) {
if (i < charsRead) {
var hex = string.Format ("{0:x2}", buffer [i]);
Console.Write (hex + " ");
} else {
Console.Write (" ");
}
if (i == 7) {
Console.Write ("-- ");
}
if (buffer [i] < 32 || buffer [i] > 250) {
buffer [i] = (byte)'.';
}
}
var bufferContent = Encoding.ASCII.GetString (buffer);
Console.WriteLine (" " + bufferContent.Substring (0, charsRead));
}
}
}
}
}
}
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