bytes_from_hexbytes()

uint8_t* bytes_from_hexbytes	(	const char *	hexbuf,
		size_t	hexsize
	)

Definition at line 86 of file lwin_wkb.c.

References hex2char, lwalloc(), and lwerror().

Referenced by lwgeom_from_hexwkb(), and LWGEOM_in().

{
        uint8_t *buf = NULL;
        register uint8_t h1, h2;
        int i;

        if( hexsize % 2 )
                lwerror("Invalid hex string, length (%d) has to be a multiple of two!", hexsize);

        buf = lwalloc(hexsize/2);

        if( ! buf )
                lwerror("Unable to allocate memory buffer.");

        for( i = 0; i < hexsize/2; i++ )
        {
                h1 = hex2char[(int)hexbuf[2*i]];
                h2 = hex2char[(int)hexbuf[2*i+1]];
                if( h1 > 15 )
                        lwerror("Invalid hex character (%c) encountered", hexbuf[2*i]);
                if( h2 > 15 )
                        lwerror("Invalid hex character (%c) encountered", hexbuf[2*i+1]);
                /* First character is high bits, second is low bits */
                buf[i] = ((h1 & 0x0F) << 4) | (h2 & 0x0F);
        }
        return buf;
}

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