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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4. #include <math.h>
  5.  
  6. int hexStringToDecimal(char ch);
  7. int decimalToBinary(int num);
  8. char* binaryToBase(char* string);
  9. char* numToBase(int m);
  10.  
  11. int main(void){
  12. 	char* hexString = "49276d206b696c6c696e6720796f757220627261696e206c696b65206120706f69736f6e6f7573206d757368726f6f6d";
  13. 	int n = strlen(hexString);
  14.     char* base64 = calloc(n / 3, sizeof(char));
  15.  
  16.     int ii = 0;
  17.     while(ii < n){
  18.  
  19.         char* bString = calloc(12, sizeof(char));
  20.  
  21.         //TODO convert string to hex then binary then string again
  22.         for (int jj = 0; jj < 3; jj++){
  23.  
  24.             int singleInt = hexStringToDecimal(hexString[ii]);
  25.             int binary = decimalToBinary(singleInt);
  26.             char buff [4];
  27.             sprintf(buff, "%04u", binary);
  28.  
  29.             strcat(bString, buff);
  30.             ii++;
  31.         }
  32.  
  33.         //TODO convert string to base64;
  34.         strcat(base64, binaryToBase(bString));
  35.         //free(bString);
  36.     }
  37.     printf("%s\n", base64);
  38.     //free(base64);
  39. }
  40.  
  41. int hexStringToDecimal(char ch){
  42.  
  43.     int singleInt = 0;
  44.     if((ch - '0') >= 0 && (ch - '0') <= 9){
  45.         singleInt = (ch - '0');
  46.     }
  47.     else if((ch - 'a') >= 0 && (ch - 'a') <= 5){
  48.         singleInt = (ch - 'a') + 10;
  49.     }
  50.     return singleInt;
  51. }
  52.  
  53. int decimalToBinary(int num){
  54.  
  55.     int i = 1, binary = 0, remainder;
  56.     while(num > 0){
  57.         remainder = num % 2;
  58.         num /= 2;
  59.         binary += remainder * i;
  60.         i *= 10;
  61.     }
  62.     return binary;
  63. }
  64.  
  65.  
  66. char* binaryToBase(char* string){
  67.  
  68.     int i = 0;
  69.     char* returnString = calloc(2, sizeof(char));
  70.     while(i < 12){
  71.         int num = 0;
  72.         for (int jj = 5; jj >=0; jj--){
  73.             num += (string[i] - '0') * pow(2, jj);
  74.             i++;
  75.         }
  76.         strcat(returnString, numToBase(num));
  77.     } 
  78.  
  79.     return returnString;
  80. }
  81.  
  82. char* numToBase(int m){  
  83.  
  84.     char* ch = calloc(1, sizeof(char));
  85.     if(m >= 0 && m <= 25){
  86.         *ch = m + 65;
  87.     }else if(m >= 26 && m <= 51){
  88.         *ch = (m - 26) + 97;    
  89.     }else if(m >= 52 && m <= 61){
  90.         *ch = (m - 52) + 48;
  91.     }
  92.     return ch;
  93. }
  94.  
  95.  
  96.  
  97.  
Success #stdin #stdout 0s 2300KB
comments ()
stdin 
Standard input is empty
stdout 
SSdtIGtpbGxpbmcgeW91ciBicmFpbiBsaWtlIGEgcG9pc29ub3VzIG11c2hyb29t
https://ideone.com/FAFC8v
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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