parse_hex()

uint8_t parse_hex

(

char *

str

)

Given a string with at least 2 chars in it, convert them to a byte value.

Convert a single hex digit into the corresponding char.

No error checking done!

Definition at line 513 of file lwgeom_api.c.

Referenced by rt_raster_from_hexwkb().

{
        /* do this a little brute force to make it faster */

        uint8_t         result_high = 0;
        uint8_t         result_low = 0;

        switch (str[0])
        {
        case '0' :
                result_high = 0;
                break;
        case '1' :
                result_high = 1;
                break;
        case '2' :
                result_high = 2;
                break;
        case '3' :
                result_high = 3;
                break;
        case '4' :
                result_high = 4;
                break;
        case '5' :
                result_high = 5;
                break;
        case '6' :
                result_high = 6;
                break;
        case '7' :
                result_high = 7;
                break;
        case '8' :
                result_high = 8;
                break;
        case '9' :
                result_high = 9;
                break;
        case 'A' :
        case 'a' :
                result_high = 10;
                break;
        case 'B' :
        case 'b' :
                result_high = 11;
                break;
        case 'C' :
        case 'c' :
                result_high = 12;
                break;
        case 'D' :
        case 'd' :
                result_high = 13;
                break;
        case 'E' :
        case 'e' :
                result_high = 14;
                break;
        case 'F' :
        case 'f' :
                result_high = 15;
                break;
        }
        switch (str[1])
        {
        case '0' :
                result_low = 0;
                break;
        case '1' :
                result_low = 1;
                break;
        case '2' :
                result_low = 2;
                break;
        case '3' :
                result_low = 3;
                break;
        case '4' :
                result_low = 4;
                break;
        case '5' :
                result_low = 5;
                break;
        case '6' :
                result_low = 6;
                break;
        case '7' :
                result_low = 7;
                break;
        case '8' :
                result_low = 8;
                break;
        case '9' :
                result_low = 9;
                break;
        case 'A' :
        case 'a' :
                result_low = 10;
                break;
        case 'B' :
        case 'b' :
                result_low = 11;
                break;
        case 'C' :
        case 'c' :
                result_low = 12;
                break;
        case 'D' :
        case 'd' :
                result_low = 13;
                break;
        case 'E' :
        case 'e' :
                result_low = 14;
                break;
        case 'F' :
        case 'f' :
                result_low = 15;
                break;
        }
        return (uint8_t) ((result_high<<4) + result_low);
}

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