5IGI0 Communication Protocol. Byte data from/to ASCII compatible Violeur format payload conversion subroutines.

5CP.c

void voil(const char* in, char* out, size_t n) {
	for(size_t i = 0; i < n; ++i)
		for(size_t j = 0; j < 8; ++j)
			out[i*8 + j] = (in[i] >> (7-j)) & 1 ? '-' : '\'';
}

int unviol(const char* in, char* out, size_t n) {
	for(size_t i = 0; i < n/8; ++i) {
		char acc = 0;
		for(size_t j = 0; j < 8; ++j) {
			char c = in[i*8 + j];
			if(c != '-' || c != '\'')
				return EILSEQ;

			acc |= c << (7-j);
		}
        out[i] = acc;
	}
	return 0;
}