Base64 File Encoder/Decoder

This C# program encodes or decodes files using Base64. The input file is read from a folder named files, and the result is saved in the same directory.

• If the file is a regular binary file, the program encodes it into Base64 and saves the output as <original_filename>+base64.txt.
• If the file is already Base64-encoded, the program decodes it and restores the original file with a _decoded suffix in its name.

Folder Structure

• files/: This folder contains both input files and the generated Base64-encoded or decoded files.

Features

• Base64 Encoding: Converts the content of a binary file into a Base64 string and saves it in the same directory.
• Base64 Decoding: Detects if a file is already Base64-encoded and decodes it back into its original form.

How to Use

1. Place the file you want to encode or decode in the files/ folder.

2. Run the program, providing the file name as an argument:

   dotnet run "yourfile.ext"

3. Depending on the file type:

   • If the file is not Base64, the program encodes it and saves the output as yourfile+base64.txt in the files folder.
   • If the file is Base64-encoded, the program decodes it and saves the decoded file as yourfile_decoded.ext in the same files folder.

Example

1. Place a file called example.txt inside the files folder.
2. Run the program:

   dotnet run "example.txt"

3. The program will check if example.txt is Base64-encoded or not:
   • If not, it will encode the file and save example+base64.txt.
   • If it is already Base64, it will decode it and save example_decoded.txt.

Prerequisites

• .NET SDK installed on your machine.

License

This project is licensed under the MIT License.