Reading JPEG files in C

- I think the most intimidating thing…about this challenge, for me, was to read a JPEG file.…I know that JPEG's an image file format…and that it's data is compressed.…You just can't examine raw bytes in a JPEG file.…The file must be properly handled.…I was in need of a JPEG library…to augment the C language's abilities.…After exhaustively searching the internet…for nearly three full minutes,…I determined that the libjpeg library was what I needed.…You can obtain a copy of the library from sourceforge.net.…

I also checked out the libjpeg turbo version,…which I probably didn't need, but I used anyway.…You can check it out at libjpegturbo.org.…If you're using cygwin on a PC,…then use the cyg package manager to install libjpeg.…I began this challenge not by writing the file code,…but just to ensure that I could successfully…read a JPEG file into memory.…Examples of such code are provided on the internet,…such as this one by Windower on GitHub.…

My first effort was a program I called duplicate.…Its job was to read in a JPEG file…