A demostration of what xxd -i will do: It takes any binary file and generates a C-compatible file defining a static array of the contents which can then be #included in.

foo.sh

xxd -i foo.txt > output.txt

foo.txt

Lorem ipsum dolor sit amet, con­secte­tur adip­isc­ing elit. Duis vulpu­tate
nisi non mi adip­isc­ing vulpu­tate. Donec eges­tas inter­dum blandit.
Phasel­lus lec­tus mas­sa, var­ius vel var­ius in, congue a lacus. Nunc
mau­ris purus, pul­v­inar vel blandit non, vestibu­lum in ante. Sed molestie,
leo ac facil­i­sis ornare, odio nulla accum­san purus, vitae adip­isc­ing
velit elit vitae nisl. Pel­len­tesque odio nisi, male­suada in sus­cipit sit
amet, lacinia ut tel­lus. Pel­len­tesque feu­giat enim a justo tem­por
ultricies.

output.txt

unsigned char moo_txt[] = {
  0x4c, 0x6f, 0x72, 0x65, 0x6d, 0x20, 0x69, 0x70, 0x73, 0x75, 0x6d, 0x20,
  0x64, 0x6f, 0x6c, 0x6f, 0x72, 0x20, 0x73, 0x69, 0x74, 0x20, 0x61, 0x6d,
  0x65, 0x74, 0x2c, 0x20, 0x63, 0x6f, 0x6e, 0xc2, 0xad, 0x73, 0x65, 0x63,
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  0xc2, 0xad, 0x69, 0x73, 0x63, 0xc2, 0xad, 0x69, 0x6e, 0x67, 0x20, 0x65,
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};
unsigned int moo_txt_len = 564;