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I think you're looking for a problem where none exists. ;-) fread() returns the total number of elements successfully read. This maps to the third parameter in the call. Ideally, it will be the same …

/recover card.raw ==21722== Memcheck, a memory error detector ==21722== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al. ==21722== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright … /recover card.raw ==21722== ==21722== Invalid write of size 1 ==21722== at 0x4A0998E: __vsprintf_internal (iovsprintf.c:97) ==21722== by 0x49E8927: sprintf (sprintf.c:30) ==21722== by 0x1092E5 …

Not hard to figure out. You have free(filename); inside your while loop. On the second pass, it will try to free filename after it's already been freed. Instant error. You don't have to free filename …

The immediate problem is that the return and fclose statements at the end of the program are contained within the while loop. As a result, the program exits when it hits the return statement and the …

First of all, are you sure that you remembered to recompile/make a new executable from the new source code file? The while loops are working fine. When I test the code, it's generating the correct nu …

These are the kind of errors that drive programmers insane!!! Here's a really big hint. WHICH files are being checked to see if the pointer is NULL, the output file or the input file? ;-) There are …

Yup, very common problem. You're probably not seeing it because you have to think carefully through all the pieces of what's happening and how those pieces all fit together to fail. All the pieces see …

I'd be willing to bet that there is no "card.raw" file in the same directory as the executable recover file. …

Half of the answer lies in the program spec. All the data in the file before the first signature is garbage data to be discarded. The other half should be simple. Before using a file pointer to open …

Hmmm... did you check the sizes of the files that were created? Notice anything conspicuous? Interesting that the files seem to only have the very top part of the image. Questions: Where are the o …

The code does indeed create image files that can be opened, but many are not correct or complete. The problem is the nested if statements. if (buffer[0] == 0xff) { if (buffer[1] == 0xd8) …

Hmmm.... let's examine the indicators here. ;-) First, no files are being created. That's a big hint. Now, the seg fault occurs on line 51: fclose(img); It seg faults trying to close this file …

This is a fairly common problem. Consider this. The problem spec says that the first part of the input file will contain garbage data that has to be discarded. That means that the very first data blo …

This is a very common problem. ;-) Think carefully about how the while loop ends. It checks to see if the EOF flag is set. If it isn't, it loops again. The problem is that the EOF flag isn't set u …

It's definitely seg faulting. I easily repeated the problem in my IDE. The problem is rooted in the use of the 2-d array picture[25][512]. This size limits the size of an image file to 12,800 bytes o …