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1 minute ago

​x
 
  #include <string.h>
  #include <stdio.h>
  #include <stdlib.h> 
//  #include "base16_decoding_table.h"
​
  unsigned char base16_decoding_table1[256] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,2,3,4,5,6,7,8,9,0,0,0,0,0,0,0,
  10,11,12,13,14,15,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,10,11,12,13,14,15,
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
​
  /* the resulting binary string is half the size of the input hex string
   * because every two hex characters map to one byte */
​
  int main(int argc,  char **argv){
​
  int TESTDATALEN=strlen(( char*) argv[1]);
​
  //unsigned char result[TESTDATALEN/2];
  char *result=malloc((TESTDATALEN/2)+1);
  *result='\0';
​
​
      size_t i;
      char cur;
      unsigned char val;
​
      for (i = 0; i < TESTDATALEN; i++) {
          cur = (char) argv[1][i];
​
          val = base16_decoding_table1[(int)cur];
​
  /* even characters are the first half, odd characters the second half
           * of the current output byte */
      if (i%2 == 0) {
              result[i/2] = val << 4;
          } else {
              result[i/2] |= val;
          }
      }
  result[(TESTDATALEN/2)] = '\0';
​
  printf ("Binary value: %s\n", result);
​
  free(result);
​
  return 0;
​
  }
​

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prog.c: In function 'main':
prog.c:30:21: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   30 |       for (i = 0; i < TESTDATALEN; i++) {
      |                     ^
prog.c:17:16: warning: unused parameter 'argc' [-Wunused-parameter]
   17 |   int main(int argc,  char **argv){
      |            ~~~~^~~~

Binary value: #Eg4Vx:K^o|-

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