Project 3: File System Decoder

1. Open the image file in binary mode.
   For example, when using fopen() in C/C++, use mode "rb". If using ifstream class in C++, make sure to use ios::binary mode.
   NOTE: Since you are required to read the image file from stdin, use read() should be enough without opening the stdin.
2. Forget about page-in/out, read the whole file into memory first!
3. File analysis:
   • Once a file is found, use sscanf() to read first 3 string
   • Check if return value of sscanf() is 3
   • Check the date format
   • If all pass, read the rest of data until '#'
   • Read the string '#'
   • Read the string after '#' and convert it into int.