hexchar
const char* hexchar = "0123456789ABCDEF";
buf[j*2] = hexchar[ data8[i+j] >> 4 ];
buf[j*2 + 1] = hexchar[ data8[i+j] & 0xF ];
(ch = hexchar(src + 1)) == -1 || ch == 0) {
digit = hexchar(*src);
digit = hexchar(*src);
const char* hexchar = "0123456789ABCDEF";
buf[j*2] = hexchar[ data8[i+j] >> 4 ];
buf[j*2 + 1] = hexchar[ data8[i+j] & 0xF ];