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protocol.c
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protocol.c
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#include "protocol.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void strrev(char* str) {
int i = 0, j = strlen(str) - 1;
while(i < j) {
char temp = str[i];
str[i] = str[j];
str[j] = temp;
i++;
j--;
}
}
void decimal_to_base4(unsigned char decimal, char base4[]) {
strcpy(base4, "0000");
int i = 0;
while(decimal > 0) {
int remainder = decimal % 4;
decimal = decimal / 4;
base4[i++] = remainder + '0';
}
strrev(base4);
base4[5] = '\0';
}
int base4_to_decimal(char* base4) {
int decimal = 0;
int len = strlen(base4);
for(int i = 0; i < len; i++) {
decimal = decimal * 4 + (base4[i] - '0');
}
return decimal;
}
void translate(char* input, char* input_alphabet, char* output_alphabet) {
int input_len = strlen(input);
int alphabet_len = strlen(input_alphabet);
for(int i = 0; i < input_len; i++) {
for(int j = 0; j < alphabet_len; j++) {
if(input[i] == input_alphabet[j]) {
input[i] = output_alphabet[j];
break;
}
}
}
}
void encode(char input[], char output[], char alphabet[], int alphabetSize) {
char string[2] = {0, 0};
for(int i = 0; i < strlen(input); i++) {
string[0] = input[i];
printf("\n%d", atoi(string));
if(atoi(string) < alphabetSize) {
output[i] = alphabet[atoi(string)];
} else {
output[i] = input[0];
}
}
output[5] = '\0';
}
unsigned char* hex_to_bytes(char hex_string[]) {
int len = strlen(hex_string);
unsigned char* bytes = malloc(len / 2);
for(int i = 0; i < len; i += 2) {
sscanf(&hex_string[i], "%2hhx", &bytes[i / 2]);
}
return bytes;
}
void dipSwitchToProtocol(unsigned char dipSw, unsigned char bitStream[PROTOCOL_LENGTH]) {
char original[5] = "0000";
char output_protocol[PROTOCOL_CHAR_LENGTH];
memset(output_protocol, 0, PROTOCOL_CHAR_LENGTH);
decimal_to_base4(dipSw / 2, original);
translate(original, "0123", PROTOCOL_ALPHABET);
strcat(output_protocol, PACKAGE_INITIATOR);
strcat(output_protocol, original);
if(dipSw % 2) {
strcat(output_protocol, "80");
} else {
strcat(output_protocol, "00");
}
memcpy(bitStream, hex_to_bytes(output_protocol), PROTOCOL_LENGTH);
}
int protocolToDipSwitch(unsigned char byte[PROTOCOL_LENGTH]) {
int dipSwitchStatus = 0;
char relevantBytes[5];
sprintf(relevantBytes, "%.2x%.2x", byte[3], byte[4]);
translate(relevantBytes, PROTOCOL_ALPHABET, "0123");
dipSwitchStatus = base4_to_decimal(relevantBytes) * 2;
if(byte[5]) {
dipSwitchStatus += 1;
}
return dipSwitchStatus;
}
uint8_t isContained(char letter, char* str) {
for(int i = 0; str[i] != 0; i++) {
if(letter == str[i]) {
return 1;
}
}
return 0;
}
uint8_t checkByte(uint8_t byte, char* alphabet) {
char hex[3];
sprintf(hex, "%02x", byte); // convierte el byte a hexadecimal
int i;
for(i = 0; i < 2; i++) {
if(isContained(hex[i], alphabet) == 0) { // busca cada caracter en el alfabeto
return 0;
}
}
return 1;
}
uint8_t checkPattern(uint8_t trailing_begin, uint8_t trailing_end, uint8_t* byte) {
int i = 0;
for(int j = 0; j < trailing_begin; j++) {
if(byte[i] != 0) {
return 0;
}
i++;
}
if((byte[i] != 0xa8) || (byte[i + 1] != 0x00) || (byte[i + 2] != 0x00) ||
!checkByte(byte[i + 3], PROTOCOL_ALPHABET) || !checkByte(byte[i + 4], PROTOCOL_ALPHABET) ||
(byte[i + 5] != 0x00 && byte[i + 5] != 0x80)) {
return 0;
}
i += PROTOCOL_LENGTH;
for(int j = 0; j < trailing_end; j++, i++) {
if(byte[i] != 0) {
return 0;
}
}
return 1;
}
uint8_t idetifyProtocol(uint8_t trailing_begining, uint8_t trailing_end, uint8_t* bitStream, int size) {
for(int i = 0; i < size - (trailing_begining + PROTOCOL_LENGTH + trailing_end); i++) {
if(checkPattern(trailing_begining, trailing_end, bitStream + i)) {
return 1;
}
}
return 0;
}