How this project works:

Inverting

Here are the files you are going to use:

Overview

The InvertFile class provides a method to process a file by inverting its bytes, but only if the file name matches a predefined expected name. It uses .NET's System.Diagnostics for logging and System.IO for file operations.

Code Explanation

1. Namespace and Using Directives

   using System;
   using System.IO;
   using System.Diagnostics;

   • System: Basic types and functions.
   • System.IO: File operations.
   • System.Diagnostics: Logging and tracing.

2. Class Declaration

   namespace InvertFile
   {
       public class InvertFile

   • The class InvertFile is encapsulated in the InvertFile namespace.

3. Constant for Expected File Name

   private static readonly string ExpectedFileName = 
       "89bb4eb5637df3cd96c463a795005065 " +
       "98c4f00b8ed6655bce4b6f80cd0e1164" +
       "1e9cfb7afa8f0df06590c0954af9025" +
       "a565be8b11d263294cd2a71676db860" +
       "ad460dc54bb5769d65f436afc02ed8ae";

   • ExpectedFileName is a string constant containing the expected file name. This is a specific, lengthy string that the file's name must match for the processing to occur.

4. Method to Process File

   public static void ProcessFile(string filePath)

   • ProcessFile is a static method that takes a filePath as a parameter.

5. Setting Up Trace Source

   TraceSource traceSource = new TraceSource("FileProcessorTraceSource");
   traceSource.Listeners.Add(new ConsoleTraceListener());
   traceSource.Switch = new SourceSwitch("sourceSwitch", "Verbose");

   • TraceSource is created to handle logging.
   • ConsoleTraceListener sends trace output to the console.
   • SourceSwitch sets the logging level to "Verbose", meaning it will log detailed information.

6. Extracting File Name and Validating

   string fileName = Path.GetFileName(filePath);
   
   if (fileName != ExpectedFileName)
   {
       traceSource.TraceEvent(TraceEventType.Error, 0, $"Unexpected file name: {fileName}");
       return;
   }

   • Path.GetFileName(filePath) extracts the file name from the given path.
   • It checks if this file name matches the ExpectedFileName. If not, it logs an error and exits the method.

7. Processing the File

   traceSource.TraceEvent(TraceEventType.Information, 0, $"Processing file: {fileName}");
   
   try
   {
       byte[] fileBytes = File.ReadAllBytes(filePath);
   
       for (int i = 0; i < fileBytes.Length; i++)
       {
           fileBytes[i] = (byte)(~fileBytes[i] + 256);
       }
   
       File.WriteAllBytes(filePath, fileBytes);
   
       traceSource.TraceEvent(TraceEventType.Information, 0, "File processed successfully.");
   }
   catch (Exception ex)
   {
       traceSource.TraceEvent(TraceEventType.Error, 0, $"An error occurred: {ex.Message}");
   }

   • Logs the start of processing.
   • Reads the file into a byte array.
   • Inverts each byte in the array. The operation ~fileBytes[i] + 256 flips all bits of the byte and then adds 256 (which essentially just converts the byte to its bitwise complement).
   • Writes the modified bytes back to the file.
   • Logs success or any errors encountered during processing.

Summary

• Purpose: Inverts the bytes of a file if the file name matches a specific expected name.
• Error Handling: Uses TraceSource to log errors and informational messages.
• File Operations: Reads bytes, processes them, and writes them back to the file.

This approach ensures that only files with the correct name are processed and provides detailed logs of the operation.