Please write in C. Not in java

Program operation:

1. The program must compile from the command line.

2. The program executable file name must be crcheck.

3. The program must run from the command line and take two (2) command line parameters.

4. The first command line parameter will be a flag value that identifies the mode of operation: c for calculating a CRC value, or v for verifying a CRC value. Only these two values are allowed. Any other values should produce a simple error message and a graceful exit from the program.

5. The second command line parameter will be the name of the file to be examined. The file should be a text file that is in the same folder as the program executable. If the file is not found, the program should issue a simple error message and exit gracefully.

6. The program should direct all output to the command window (terminal) screen. The details of what to output are described below.

7. The program MUST run on Eustis. Please make sure to test your program on Eustis before submitting the assignment.

What to submit:

Submit a single source code file written in C, C++, or Java. No other languages are permitted.

The source code file must be a .c, .cpp, or .java file.

Put all classes, functions, and methods in the one file.

If programming in Java, do not place the source in your own package so our test scripts can run without changes.

If you are coding in C or C++, you must use only the standard libraries, such as stdio.h, math.h, and Standard Template Library.

If using Java, your source file must be named crcheck.java.

You must also submit a README file, which must be a text file, and which contains:

The compilation command for your program

The run command for your program

Input file format:

Valid input files will be ASCII files that contain printable data. There will be no pad or fill characters in a raw input file.

If an input file contains any invalid data (other than an end-of-file marker), then the program should issue an appropriate brief error message and terminate gracefully.

The raw input file will consist of ASCII data of varying length up to 512 bytes, with the last 8 bytes reserved for the checksum. (Note: The CRC or checksum will be a 16 bit integer, or 4 hexadecimal digits, which will fill the last 4 bytes/characters, the leading 4 characters should be zeroes.)

In the event the input file is not 504 characters (512 8) the deficiency should be padded with the . character as shown in the examples below. Note that the . character will affect the generated CRC.

Output format:

Output the ASCII file that is read, 64 characters to a line. Alphabetic characters in this output must be represented as it was read from the input file, regardless of case.

Next, you will show the result of each 64 characters lines cumulative XOR operation involved in the CRC calculation or verification. For example:

abcdefghijklmnopqrstuvwxyz12345-ABCDEFGHIJKLMNOPQRSTUVWXYZ12345a - 0000206c

Note that the input is shown in black and the lines CRC is shown in red. (There is no need to use color in the output for the assignment.)

At the end, when calculating CRC, you must show the CRC result in hexadecimal. Please note that in the event the input file is less than 512 characters, you must pad the remainder of the output file with blank spaces reserving the last 8 characters for the ASCII representation of the CRC, with leading zeroes as needed to obtain a 16-bit value for the CRC-15 code.

On the other hand, if verifying CRC, you must output (a) the accumulated CRC value in hexadecimal at the end of each 64 character output of the input file including pad spaces and the stated hexadecimal CRC (Note that the CRC even though it is hexadecimal data it will be printed in ASCII.); (b) the CRC (hexadecimal) calculated by the program; and (c) a message whether the CRC check passed or failed.

Specific Functions inside code:

You must implement the following functions/methods:

A function/method to read the data in the input file into an array.

An XOR function/method that takes as input two 32 bit unsigned binary integers and returns the XOR result. (Java does not support 16 bit unsigned integers unless using Java 8, hence the 32 bit unsigned integer appropriately used, provides adequate bit space for the CRC calculations.)

A function/method for CRC calculation

A function/method for CRC verification

Your program must successfully compile from the command line with one of these commands:

C program: prompt> gcc lm o crcheck [your_file_name].c

C++ program: prompt> g++ -lm o crcheck [your_file_name].cpp

Java program: prompt> javac crcheck.java

Note: If you are submitting a Java program, the class file must be named crcheck.java and the class name must be crcheck (all lower case).