Question

I have a C-array that looks like this:

char hexc[] = {
    0x41, 0x80, 0x7a, 0x39, 0xea, 0x7e, 0x27, 0xfc, 
    0xe6, 0x45, 0x9c, 0x8b, 0xb5, 0xce, 0xa7, 0x35, 
    0x5f, 0xf2, 0x43, 0xcf, 0x89, 0xd8, 0x61, 0xec, 
    0xe7, 0xed, 0x2e, 0x34, 0x45, 0x0c, 0x32, 0xae, 
    0x71, 0x4f, 0x1c, 0xd8, 0xb5, 0x8c, 0x1e, 0xdd,
    0x5d, 0x90, 0xf3, 0xf2, 0xe7, 0xa6, 0x4f, 0xef, 
    0xec, 0x96, 0xe3, 0xca, 0x8e, 0xeb, 0x64, 0x1d, 
    0x18, 0xa9, 0x95, 0xec, 0x64, 0x02, 0xf8, 0x26, 
};

I knew that behind this hex-representations is a .GIF-file, what is the best way to generate from this hex-values a viewable file again? And how to add the missing GIF-header?

Answer 1

You would just open the file and write to it:

FILE *f = fopen("filename.gif", "wb");
if (!f) return; // or do something else
fwrite(hexc, 1, sizeof(hexc), f);
fclose(f);

Make sure to #include <stdio.h>.