The Boston Diaries

The ongoing saga of a programmer who doesn't live in Boston, nor does he even like Boston, but yet named his weblog/journal “The Boston Diaries.”

Go figure.

Saturday, February 04, 2012

99 ways to program a hex, Part 27: C♯, binary stream

Jeff Cuscutis sent in another version of the C♯ program. He writes:

Sean Conner <>
Re: 99 Programs
Sat, 4 Feb 2012 22:51:37 -0500

Modified to use BinaryReader instead of TextReader. It sort of worked on binary files before this, but replaced unprintable characters with “?” automatically when read.

It now does this correctly, but I had to make a wrapper function to read data from the Console as that is a TextReader.

// *************************************************************************
// Copyright 2012 by Jeff Cuscutis.  All Rights Reserved.
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
// Comments, questions and criticisms can be sent to:
// ***********************************************************************

// C#, binary stream

using System;
using System.IO;

namespace Hex
    class Program
        static void Main(string[] args)
            if (args.Length == 0)
                DoDump(ReadFromConsole, Console.Out);
                foreach (var fileName in args)
                        using (var file = new FileStream(fileName, FileMode.Open, FileAccess.Read))
                            var tr = new BinaryReader(file);
                            DoDump(tr.Read, Console.Out);
                    catch (Exception e)

        // wrapper to fake reading from a TextReader to 
        // make it look like it is a BinaryReader
        static int ReadFromConsole(byte[] buf, int index, int count)
            var charBuf = new char[count];

            int actuallyRead = Console.In.Read(charBuf, index, count);

            for (int i = 0; i < charBuf.Length; i++)
                buf[i] = (byte)charBuf[i];

            return actuallyRead;

        static void DoDump(Func<byte[], int, int, int> readFunc, TextWriter outFile)
            const int blockLength = 16;
            int actuallyRead;
            var buf = new byte[blockLength];
            var offset = 0;

            while ((actuallyRead = readFunc(buf, 0, blockLength)) > 0)
                var display = new char[blockLength+1];

                outFile.Write("{0:X8} ",offset);

                var j = 0;
                    outFile.Write("{0:X2} ", buf[j]);
                    if (!char.IsControl((char)buf[j]))
                        display[j] = (char)buf[j];
                        display[j] = '.';
                } while ((j < blockLength) && (actuallyRead > 0));
                display[blockLength] = '\0';

                if (j < blockLength)
                    for (var i = j; i < blockLength; i++) outFile.Write("   ");



Update on Monday, February 6th, 2012

Jeff wrote me to add:

I forgot to mention that it also uses a generic signature to handle the readFunc parameter in DoDump()

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