93 lines
2.5 KiB
C#
93 lines
2.5 KiB
C#
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///////////////////////////////////////////////////////////////////////////////
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//
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// Microsoft Research Singularity
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// File: cmp.cs
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//
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// Note:
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//
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using System;
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using System.IO;
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namespace Microsoft.Singularity.Applications
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{
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public class Cmp
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{
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public enum ExitCode :int {
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FilesEquivalent = 0,
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FilesDiffer = 1,
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Usage = 2,
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Error = 3
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}
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public static void Exit(ExitCode e)
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{
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Environment.Exit((int)e);
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}
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public static void Usage()
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{
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Console.WriteLine("Cmp <fileA> <fileB>");
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Exit(ExitCode.Usage);
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}
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public static FileInfo GetFileInfo(string filepath)
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{
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try {
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return new FileInfo(filepath);
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}
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catch (Exception e) {
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Console.Error.WriteLine("Exception when accessing {0} : {1}",
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filepath, e);
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}
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return null;
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}
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public static void Main(string [] args)
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{
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if (args.Length != 2) {
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Usage();
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}
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FileInfo a = GetFileInfo(args[0]);
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if (a == null) {
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Exit(ExitCode.Error);
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}
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FileInfo b = GetFileInfo(args[1]);
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if (b == null) {
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Exit(ExitCode.Error);
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}
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if (a.Length != b.Length) {
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Exit(ExitCode.FilesDiffer);
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}
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ExitCode ec = ExitCode.FilesDiffer;
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try {
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using (Stream sa = a.OpenRead()) {
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using (Stream sb = b.OpenRead()) {
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int ba, bb;
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do {
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ba = sa.ReadByte();
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bb = sb.ReadByte();
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} while ((ba == bb) && (ba != -1));
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ec = (ba == bb) ? ExitCode.FilesEquivalent : ExitCode.FilesDiffer;
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}
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}
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Exit(ec);
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} catch (Exception e) {
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Console.Error.WriteLine(
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"Exception during attempted comparison: {0}",
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e
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);
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Exit(ExitCode.Error);
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}
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}
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}
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}
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