* * * * *
99 ways to program a hex, Part 27: C♯, binary stream
Jeff Cuscutis [1] sent in another version of the C♯ program [2]. He writes:
> From: Jeffrey Cuscutis <XXXXXXXXXXXXXXXXXXXXXXX>
> To: Sean Conner <
[email protected]>
> Subject: Re: 99 Programs
> Date: 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
> // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> // 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:
[email protected]
> //
> // ***********************************************************************
>
> // 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);
> }
> else
> {
> foreach (var fileName in args)
> {
> try
> {
> using (var file = new FileStream(fileName, FileMode.Open, FileAccess.Read))
> {
> var tr = new BinaryReader(file);
> Console.Out.WriteLine("-----{0}-----",fileName);
> DoDump(tr.Read, Console.Out);
> file.Close();
> }
> }
> catch (Exception e)
> {
> Console.Error.WriteLine(e.Message);
> }
>
> }
> }
> }
>
> // 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;
> do
> {
> outFile.Write("{0:X2} ", buf[j]);
> if (!char.IsControl((char)buf[j]))
> display[j] = (char)buf[j];
> else
> display[j] = '.';
> offset++;
> j++;
> actuallyRead--;
> } while ((j < blockLength) && (actuallyRead > 0));
> display[blockLength] = '\0';
>
> if (j < blockLength)
> for (var i = j; i < blockLength; i++) outFile.Write(" ");
>
> outFile.WriteLine(display);
>
> outFile.Flush();
> }
> }
> }
> }
>
* Part 26: C89, system calls and mmap() [3]
* Part 28: K&R, system calls, full buffering [4]
Update on Monday, February 6^th, 2012
Jeff wrote me to add:
> I forgot to mention that it also uses a generic signature to handle the
> readFunc parameter in DoDump()
>
[1]
http://spinthecat.blogspot.com/
[2]
gopher://gopher.conman.org/0Phlog:2012/02/02.1
[3]
gopher://gopher.conman.org/0Phlog:2012/02/03.1
[4]
gopher://gopher.conman.org/0Phlog:2012/02/05.1
Email author at
[email protected]
