Paul Bakker | 367dae4 | 2009-06-28 21:50:27 +0000 | [diff] [blame^] | 1 | int unhexify(unsigned char *obuf, const char *ibuf) |
| 2 | { |
| 3 | unsigned char c, c2; |
| 4 | int len = strlen(ibuf) / 2; |
| 5 | assert(!(strlen(ibuf) %1)); // must be even number of bytes |
| 6 | |
| 7 | while (*ibuf != 0) |
| 8 | { |
| 9 | c = *ibuf++; |
| 10 | if( c >= '0' && c <= '9' ) |
| 11 | c -= '0'; |
| 12 | else if( c >= 'a' && c <= 'f' ) |
| 13 | c -= 'a' - 10; |
| 14 | else if( c >= 'A' && c <= 'F' ) |
| 15 | c -= 'A' - 10; |
| 16 | else |
| 17 | assert( 0 ); |
| 18 | |
| 19 | c2 = *ibuf++; |
| 20 | if( c2 >= '0' && c2 <= '9' ) |
| 21 | c2 -= '0'; |
| 22 | else if( c2 >= 'a' && c2 <= 'f' ) |
| 23 | c2 -= 'a' - 10; |
| 24 | else if( c2 >= 'A' && c2 <= 'F' ) |
| 25 | c2 -= 'A' - 10; |
| 26 | else |
| 27 | assert( 0 ); |
| 28 | |
| 29 | *obuf++ = ( c << 4 ) | c2; |
| 30 | } |
| 31 | |
| 32 | return len; |
| 33 | } |
| 34 | |
| 35 | void hexify(unsigned char *obuf, const unsigned char *ibuf, int len) |
| 36 | { |
| 37 | unsigned char l, h; |
| 38 | |
| 39 | while (len != 0) |
| 40 | { |
| 41 | h = (*ibuf) / 16; |
| 42 | l = (*ibuf) % 16; |
| 43 | |
| 44 | if( h < 10 ) |
| 45 | *obuf++ = '0' + h; |
| 46 | else |
| 47 | *obuf++ = 'a' + h - 10; |
| 48 | |
| 49 | if( l < 10 ) |
| 50 | *obuf++ = '0' + l; |
| 51 | else |
| 52 | *obuf++ = 'a' + l - 10; |
| 53 | |
| 54 | ++ibuf; |
| 55 | len--; |
| 56 | } |
| 57 | } |