C program, encrypts a binary file and then save it.

Write a program, myfilehide2, that encrypts a file — ASCII or binary — and saves the encrypted file. myfilehide2 reads from stdin a string that specifies the file to be encrypted followed by an integer. For example,

% myfilehide2
a.out 7

myfilehide2 saves the encrypted content in a new file whose name has “.E2” added as a suffix. After doing so, the app deletes the original file by calling remove(). In the above example, a.out.E2. We restrict input file names to be less than 15 characters and output file names to be less than 18 characters to account for the 3 character suffix. Spaces are not allowed in a file name. The filename and number must be separated by one or more space (‘ ‘) or tab (‘t’) characters. The number must be a single digit — either 0, 1, …, 7 — and end with ‘n’ which is generated on stdin when the ENTER/RETURN key is pressed on our lab machines. All other input of different format are disallowed and should result in a suitable error message on stdout followed by app termination by calling exit(1).

use the library function getchar() to read the input byte-by-byte. When a space character or tab character is encountered, assume the filename has ended and store it as a string in a 1-D char array of size 16. Of course, that is assuming that the filename has not exceeded 15 characters. Instead of the constants 15 and 16, use the C preprocessor directive #define to specify your own macro to reduce the potential for run-time bugs. Read the single digit (0, 1, …, 7) into variable, char numpos, and convert numpos into a decimal number, unsigned int decpos, when interpreted as a decimal number. For example, the ASCII character ‘3’ stored in numpos is convered to the decimal number 3, not the decimal encoding of the ASCII character ‘3’ which is 51.

Do not use any string processing library function to perform the input parsing task. The parsing chore can be implemented with a few lines of code. Delegate the input parsing task to

void inputcheck(void);

which stores a valid filename input a global 1-D char array. Make the variable numpos also global. 

After inputcheck() returns (it may not return if the input is ill-formatted), main() opens the input file to read and creates an output file with suffix “.E2” to write the encrypted bytes. If either of the two operations is unsuccessful, main() prints a suitable error message to stdout and terminates by calling exit(1). Otherwise, like in Problem 2, lab3, myfilehide2 reads the content of the input file byte by byte using fgetc(). Unlike myfilehide, myfilehide2 flips the bit value at the bit position specified by decpos and writes the resultant byte into the output file. For example, if an input byte has bits 00001111 and decpos equals 2, the encrypted byte is 00001011. Note that the rightmost bit at position 0 is considered the least significant bit. As with myfilehide, myfilehide2 has the property that running the app again on the encrypted file with the same digit as second arguments decrypts the file. Perform a similar cleanup as myfilehide so that the encrypted file with suffix “.E2” is deleted. Use Makefile to compile your app. Test and verify that it works correctly on mac terminal.

Calculate your paper price
Pages (550 words)
Approximate price: -

Why Choose Us

Quality Papers

We value our clients. For this reason, we ensure that each paper is written carefully as per the instructions provided by the client. Our editing team also checks all the papers to ensure that they have been completed as per the expectations.

Professional Academic Writers

Over the years, our Acme Homework has managed to secure the most qualified, reliable and experienced team of writers. The company has also ensured continued training and development of the team members to ensure that it keep up with the rising Academic Trends.

Affordable Prices

Our prices are fairly priced in such a way that ensures affordability. Additionally, you can get a free price quotation by clicking on the "Place Order" button.

On-Time delivery

We pay strict attention on deadlines. For this reason, we ensure that all papers are submitted earlier, even before the deadline indicated by the customer. For this reason, the client can go through the work and review everything.

100% Originality

At Buy An Essay, all papers are plagiarism-free as they are written from scratch. We have taken strict measures to ensure that there is no similarity on all papers and that citations are included as per the standards set.

Customer Support 24/7

Our support team is readily available to provide any guidance/help on our platform at any time of the day/night. Feel free to contact us via the Chat window or support email: support@acmehomework.com.

Try it now!

Calculate the price of your order

We'll send you the first draft for approval by at
Total price:
$0.00

How it works?

Follow these simple steps to get your paper done

Place your order

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Receive the final file

Once your paper is ready, we will email it to you.

Our Services

Buy An Essay has stood as the world’s leading custom essay writing services providers. Once you enter all the details in the order form under the place order button, the rest is up to us.

Essays

Essay Writing Services

At Buy An Essay, we prioritize on all aspects that bring about a good grade such as impeccable grammar, proper structure, zero-plagiarism and conformance to guidelines. Our experienced team of writers will help you completed your essays and other assignments.

Admissions

Admission and Business Papers

Be assured that you’ll definitely get accepted to the Master’s level program at any university once you enter all the details in the order form. We won’t leave you here; we will also help you secure a good position in your aspired workplace by creating an outstanding resume or portfolio once you place an order.

Editing

Editing and Proofreading

Our skilled editing and writing team will help you restructure you paper, paraphrase, correct grammar and replace plagiarized sections on your paper just on time. The service is geared toward eliminating any mistakes and rather enhancing better quality.

Coursework

Technical papers

We have writers in almost all fields including the most technical fields. You don’t have to worry about the complexity of your paper. Simply enter as much details as possible in the place order section.