-#define MAX_BLOCK_LENGTH 512
-
-static uint8_t ascii_to_nibble(uint8_t a)
-{
- uint8_t c = 0x00;
-
- if ((a >= '0') && (a <= '9')) {
- c = a - '0';
- } else if ((a >= 'A') && (a <= 'F')) {
- c = (a - 'A') + 10;
- } else if ((a >= 'a') && (a <= 'f')) {
- c = (a - 'a') + 10;
- }
-
- return c;
-}
-
-static int validate_nibble(uint8_t a)
-{
- if (((a >= '0') && (a <= '9')) ||
- ((a >= 'A') && (a <= 'F')) ||
- ((a >= 'a') && (a <= 'f')))
- return 1;
-
- return 0;
-}