Phoenix Network Forums

yeah... i went on the IRC channel and only two people out of like 30 responded. so now i'm here.

yes this is my first post, yes i am trying to get a shell account.... but i figured, i was going to post this on some forum anyways, may as well be here.

anyways........

i'm trying to get the following C code to work in java, but i don't know how since java actually has strings.............. i know it works in C, i use it. this isnt a full program, just two functions used by my encryption algorithm.......... so yeah. any ideas on how i would do this in java?

Code: Select all

char toch(int w) {
   if (w > 9) return (w + 55);
   else return (w + 48);
}

int toi(char w) {
   if (w > 64) return (w - 55);
   else return (w - 48);
}

int leng(char* str) {
  int x;
  for (x = 0; str[x] != 0; x++) {}
  return x;
}

void revstr(char* str) {
  char tmp;
  int l = leng(str), l2 = l - 1, ong;
  for (ong = 0; ong < (l / 2); ong++) {
    tmp = str[ong];
    str[ong] = str[l2 - ong];
    str[l2 - ong] = tmp;
  }
}

toi and toch (to integer / character, my atoi replacements) just use ascii codes.
leng is my strlen replacement............

and sorry for the lack of comments.

Like I said before, I don't know basic Java fully, but I do know Google:

What the Mighty and Powerful Google doth sayeth is:
1) Make a StringBuffer object to screw with first.

RTFM! wrote:A string buffer implements a mutable sequence of characters. A string buffer is like a String, but can be modified. At any point in time it contains some particular sequence of characters, but the length and content of the sequence can be changed through certain method calls.

2) Once thou understandeth thy concept, thou shalt Google again, for a coherent answer (I tried "reverse java string"):

Code: Select all


// http://java.sun.com/docs/books/tutorial/java/data/stringsummary.html
protected static String reverse(String string) {
     StringBuilder sb = new StringBuilder(string);

        return sb.reverse().toString();
}

Oops! "StringBuilder" vs "StringBuffer"! Find the docs for StringBuilder and you'll find that it's pretty much the same thing as StringBuffer, except "but with no guarantee of synchronization." However, "Where possible, it is recommended that this class be used in preference to StringBuffer as it will be faster under most implementations."

Since you're not using any threads, it's probably safe to use StringBuilder. It's up to you though.

Hmm. I kinda didnt get that, but google i shall.

In java the code will look something like this

Code: Select all

char toch(int w) {
   return w > 9 ? w + 55 : w + 48
}

int toi(char w) {
   return w > 64 ? w - 66 : w - 48
}

/* in java you don't need that
int leng(char* str) {
  int x;
  for (x = 0; str[x] != 0; x++) {}
  return x;
}
*/

String revstr(String str) {
   char[] res = str.toCharArray();
   char tmp = 0;
   for (int ong = 0; ong < res.length / 2; ong++) {
      tmp = str[ong];
      res[ong] = res[l2 - ong];
      res[l2 - ong] = tmp;
      
   }
   return new String(res);
}