F28HS2: Hardware Software Interface - Struct PPM to Hold PPM Images - Computer Science Assignment Help

Assignment Task:

PPM Format
A) Design a struct PPM to hold PPM images as defined above.
B) Write functions:
struct PPM * getPPM(FILE * f) to return a C structure PPM image from file “f”; 
showPPM(struct PPM * im) to display the PPM image “im” as text in the above format;
struct PPM * encode(struct PPM * im, char * message, unsigned int mSize, unsigned int secret) to return a modified copy of PPM image “im” with “message” characters hidden in its pixels using “secret”; “mSize” is the size of “message”.

C) Write a program steg to encode and decode messages in PPM images.
- For the call:
$ steg e file1.ppm > file2.ppm
steg prompts for a message and a secret and shows file1.ppm with the message encoded within it. Here, the output is redirected to file2.ppm.
- For the call:
$ steg d file.ppm
steg prompts for the secret, then shows the message hidden in file.ppm if the secret is the right one (or a wrong message, extracted from the image using the wrong secret).

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