Java - Hex2Text - First Draft |
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 Cpt SAJChurchey I had to write a separate conversion for hex -> decimal so that I could get the ascii value. I'm wondering whether or not I should do the same thing for the Bin2Text function. public static String hex2Text(String str){
if(str == null || str.trim().length() == 0)
return "";
str = str.trim();
str = str.toLowerCase(); //ensures all input is lower case
if(str.matches("[^0-9a-f\\s]")){
/*
User needs to be warned that their input is invalid
Method must terminate
*/
return ""; //Until proper exception can be written
}
StringTokenizer tokenizedStr = new StringTokenizer(str);
StringBuffer text = new StringBuffer();
while(tokenizedStr.hasMoreTokens()){
String hexString = tokenizedStr.nextToken();
int bytelen = hexString.length();
if(bytelen > 4){
//User needs to be told input is not valid
return ""; //Until exception can be written.
}
int decimal = hex2decimal(hexString);
int intValue = 0;
for(int i = 0;i < strlen;++i){
int oneOrZero = decimal % 10;
decimal /= 10;
intValue += Math.pow(2,i) * oneOrZero;
}//end for
char textEquivalent = (char) intValue;
text.append(textEquivalent);
}//end while
return text.toString();
}
private static int hex2decimal(String hex){
int decimal = 0;
for(int i = hex.length() - 1;i >= 0;--i){
int asciiValue = hex.charAt(i);
if(asciiValue >= '0' && asciiValue <= '9')
asciiValue -= 48;
else{
asciiValue -= 87;
}
decimal += Math.pow(16,i) * asciiValue;
}//end for
return decimal;
}//end hex2decimal()
Cpt SAJChurchey
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