flipperzero-firmware/lib/toolbox/hex.c
Sebastian Mauer 1350dcaf63
Add support for PAC/Stanley tags (#1648)
* Add support for PAC/Stanley tags
* Address review comments
2022-08-30 01:04:17 +10:00

56 lines
1.6 KiB
C

#include "hex.h"
bool hex_char_to_hex_nibble(char c, uint8_t* nibble) {
if((c >= '0' && c <= '9') || (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f')) {
if((c >= '0' && c <= '9')) {
*nibble = c - '0';
} else if((c >= 'A' && c <= 'F')) {
*nibble = c - 'A' + 10;
} else {
*nibble = c - 'a' + 10;
}
return true;
} else {
return false;
}
}
bool hex_char_to_uint8(char hi, char low, uint8_t* value) {
uint8_t hi_nibble_value, low_nibble_value;
if(hex_char_to_hex_nibble(hi, &hi_nibble_value) &&
hex_char_to_hex_nibble(low, &low_nibble_value)) {
*value = (hi_nibble_value << 4) | low_nibble_value;
return true;
} else {
return false;
}
}
bool hex_chars_to_uint8(const char* value_str, uint8_t* value) {
bool parse_success = false;
while(*value_str && value_str[1]) {
parse_success = hex_char_to_uint8(*value_str, value_str[1], value++);
if(!parse_success) break;
value_str += 2;
}
return parse_success;
}
bool hex_chars_to_uint64(const char* value_str, uint64_t* value) {
uint8_t* _value = (uint8_t*)value;
bool parse_success = false;
for(uint8_t i = 0; i < 8; i++) {
parse_success = hex_char_to_uint8(value_str[i * 2], value_str[i * 2 + 1], &_value[7 - i]);
if(!parse_success) break;
}
return parse_success;
}
void uint8_to_hex_chars(const uint8_t* src, uint8_t* target, int length) {
const char chars[] = "0123456789ABCDEF";
while(--length >= 0)
target[length] = chars[(src[length >> 1] >> ((1 - (length & 1)) << 2)) & 0xF];
}