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This code has an infinite loop. Look at the last while condition statement: while (fread(buffer, 512, 1, forensic) <= 1); What happens when the end of the input file is reached? fread will ...

You seem to be missing a concept. Each jpg will be made up of multiple blocks of 512B. Your goal is to read from the rawfile until you find a signature block. Once you do, if you already have found ...

The biggest problem here is that the code is trying to test for a signature before actually reading in the data from the input file. It's doing a "Ready, Fire, Aim." Order of actions is ...