ConvertUTF.c#200static const UTF8 firstByteMark[7] = { 0x00, 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };
#309     case 0xF0: if (a < 0x90) return false; break;
dstring.c#93    } else if(RANGE(ch0,0xF0,0XF7)) {/* 3-bytes, but check */
#119    } else if((ch0 == 0xF0)) {/* planes 1-3 */
dutf8proc.c#185    dst[0] = (uint8_t)(0xF0 + (uc >> 18));
ochttp.c#250 hex2 = (c & 0xF0) >> 4;


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