How to extract binary data from a File?

Hello there!
Hope I'm right here.
I have a slight problem with a file containing text- and binary-data. At the beginning of the file is only some text followed by some html-code and at the end is some binary stuff like a pdf oder an image (jpg/gif).
My problem is now how to split these parts and save them in the suitable format. The text and the html are no problem, but I don't know how to extract the binary data. I tried it out with an Inputstream, but I don't know how to find the exact position where the binary data begins.
Anyone have an idea how I can solve this?
Thanks in advance and sorry for my bad english.

I don't believe a bullet-proof solution exists.
If you know where the HTML ends, you may skip whitespace and then assume the rest is binary data. Or, if you know the first bytes of the binary data, you may locate those. With either of these solutions, though, you risk coming across a file where it doesn't work as expected, for example if the first byte of the binary data happens to match a whitespace character.

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