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