1/4 chance of maximising or minimising the string length

fuzzer/Fuzzer.java

@@ -8,15 +8,17 @@ import java.util.Random;
 public class Fuzzer {
 
     private static final String OUTPUT_FILE = "fuzz.txt";
+    
     private static final String CHAR_LOWER = "abcdefghijklmnopqrstuvwxyz";
     private static final String CHAR_UPPER = CHAR_LOWER.toUpperCase();
     private static final String NUMBER = "0123456789";
-    private static final int MAX_STRING_LENGTH = 1014;
+    
+    private static final int MAX_LINE_LENGTH = 1022;
 	private static final int MAX_URL_LENGTH = 300;
     private static final int numInputLines = 1024; //Indicates the number of inputs we wish to generate in one file
-    private static ArrayList<String> savedURLs = new ArrayList<String>();
+    private static ArrayList<String> savedURLs = new ArrayList<String>(); //save put urls here for get and rem
 
-    private static final String DATA_FOR_RANDOM_STRING = CHAR_LOWER + CHAR_UPPER + NUMBER;
+    private static final String DATA_FOR_RANDOM_STRING = CHAR_LOWER + CHAR_UPPER + NUMBER; //specifies which characters can be in a string
     
     public static void main(String[] args) throws IOException {
         System.out.println(Instruction.getBNF());
@@ -91,7 +93,8 @@ public class Fuzzer {
     			input += " "+ url;
     			
     		}else if(op.equals(OperandType.STRING)) {
-    			input += " "+generateRandomString(MAX_STRING_LENGTH);
+    			int maxStringLength = MAX_LINE_LENGTH - input.length() - ((inst.getOperands().length-index)*2);
+    			input += " "+generateRandomString(maxStringLength);
     		}
     		index++;
         }    	
@@ -115,14 +118,26 @@ public class Fuzzer {
      * and modified*/
     public static String generateRandomString(int maxlength) {
         if (maxlength < 1) throw new IllegalArgumentException();
+        Random random = new Random();
+        int minLength = 1;
+        int length;
+        
+        //make a 1/4 chance of picking the max length and a 1/4 chance of picking the min length
+        int chance = random.nextInt(4);
+        if(chance == 1) {
+        	length = maxlength;
+        }else if(chance == 2) {
+        	length = minLength;
+        }else {
+        	length = random.nextInt(maxlength)+1;
+        }
         
-        int length = new Random().nextInt(maxlength)+1;
 
         StringBuilder sb = new StringBuilder(length);
         for (int i = 0; i < length; i++) {
 
 			// 0-62 (exclusive), random returns 0-61
-            int rndCharAt = new Random().nextInt(DATA_FOR_RANDOM_STRING.length());
+            int rndCharAt = random.nextInt(DATA_FOR_RANDOM_STRING.length());
             char rndChar = DATA_FOR_RANDOM_STRING.charAt(rndCharAt);
 
             sb.append(rndChar);