Fix Hash.toHex for odd character Strings

Also, made two functions work the same, and removed CadiException
Because CadiException removed, covered "FileGetter" with NullCheck

Issue-ID: AAF-941
Signed-off-by: Instrumental <jgonap@stl.gathman.org>
Change-Id: I7ee13ab98d3a70c1cdc59573921e0948ef198f9c

2 files changed, 73 insertions, 57 deletions

diff --git a/cadi/core/src/main/java/org/onap/aaf/cadi/Hash.java b/cadi/core/src/main/java/org/onap/aaf/cadi/Hash.java
index 26c33c84..3827aed0 100644
--- a/cadi/core/src/main/java/org/onap/aaf/cadi/Hash.java
+++ b/cadi/core/src/main/java/org/onap/aaf/cadi/Hash.java
@@ -25,6 +25,12 @@ import java.nio.ByteBuffer;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 
+/**
+ * 
+ * 
+ * @author Jonathan
+ *
+ */
 public class Hash {
     private static char hexDigit[] = "0123456789abcdef".toCharArray();
 
@@ -149,6 +155,10 @@ public class Hash {
         return compare;
     }
 
+    /**
+     * @param ba
+     * @return
+     */
     public static String toHexNo0x(byte[] ba) {
         StringBuilder sb = new StringBuilder();
          for (byte b : ba) {
@@ -158,6 +168,10 @@ public class Hash {
          return sb.toString();
     }
 
+    /**
+     * @param ba
+     * @return
+     */
     public static String toHex(byte[] ba) {
         StringBuilder sb = new StringBuilder("0x");
          for (byte b : ba) {
@@ -177,14 +191,17 @@ public class Hash {
     }
 
 
-    public static byte[] fromHex(String s)  throws CadiException{
-        if (!s.startsWith("0x")) {
-            throw new CadiException("HexString must start with \"0x\"");
-        }
-        boolean high = true;
-        int c;
+    public static byte[] fromHex(String s) {
+    	if(!s.startsWith("0x")) {
+    		return fromHexNo0x(s);
+    	}
         byte b;
-        byte[] ba = new byte[(s.length()-2)/2];
+        int c;
+        byte[] ba;
+        int extra = s.length()%2; // odd requires extra
+        ba = new byte[(s.length()-2)/2 + extra];
+        boolean high = extra==0;
+        
         int idx;
         for (int i=2;i<s.length();++i) {
             c = s.charAt(i);
@@ -195,9 +212,9 @@ public class Hash {
             } else if (c>=0x41 && c<=0x46) {
                 b=(byte)(c-0x37);
             } else {
-                throw new CadiException("Invalid char '" + c + "' in HexString");
+                return null;
             }
-            idx = (i-2)/2;
+            idx = (i-2+extra)/2;
             if (high) {
                 ba[idx]=(byte)(b<<4);
                 high = false;
@@ -208,7 +225,7 @@ public class Hash {
         }
         return ba;
     }
-
+    
     /**
      * Does not expect to start with "0x"
      * if Any Character doesn't match, it returns null;
@@ -217,23 +234,16 @@ public class Hash {
      * @return
      */
     public static byte[] fromHexNo0x(String s) {
-        int c;
         byte b;
+        int c;
         byte[] ba;
-        boolean high;
-        int start;
-        if (s.length()%2==0) {
-            ba = new byte[s.length()/2];
-            high=true;
-            start=0;
-        } else {
-            ba = new byte[(s.length()/2)+1];
-            high = false;
-            start=1;
-        }
+        int extra = s.length()%2; // odd requires extra byte to store
+        ba = new byte[(s.length())/2 + extra];
+        boolean high = extra==0;
+        
         int idx;
-        for (int i=start;i<s.length();++i) {
-            c = s.charAt((i-start));
+        for (int i=0;i<s.length();++i) {
+            c = s.charAt(i);
             if (c>=0x30 && c<=0x39) {
                 b=(byte)(c-0x30);
             } else if (c>=0x61 && c<=0x66) {
@@ -243,7 +253,7 @@ public class Hash {
             } else {
                 return null;
             }
-            idx = i/2;
+            idx = (i+extra)/2;
             if (high) {
                 ba[idx]=(byte)(b<<4);
                 high = false;
@@ -254,5 +264,4 @@ public class Hash {
         }
         return ba;
     }
-
 }
diff --git a/cadi/core/src/test/java/org/onap/aaf/cadi/test/JU_Hash.java b/cadi/core/src/test/java/org/onap/aaf/cadi/test/JU_Hash.java
index 05abc7ed..0395830e 100644
--- a/cadi/core/src/test/java/org/onap/aaf/cadi/test/JU_Hash.java
+++ b/cadi/core/src/test/java/org/onap/aaf/cadi/test/JU_Hash.java
@@ -22,15 +22,17 @@
 
 package org.onap.aaf.cadi.test;
 
-import org.junit.Test;
-import org.onap.aaf.cadi.CadiException;
-import org.onap.aaf.cadi.Hash;
-
-import static org.junit.Assert.*;
+import static org.hamcrest.CoreMatchers.equalTo;
+import static org.hamcrest.CoreMatchers.not;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertTrue;
 
 import org.junit.BeforeClass;
-
-import static org.hamcrest.CoreMatchers.*;
+import org.junit.Test;
+import org.onap.aaf.cadi.Hash;
 
 public class JU_Hash {
     // Some common test vectors
@@ -63,7 +65,7 @@ public class JU_Hash {
     private String numbersDec = "1234567890";
     private String numbersHex = "0x31323334353637383930";
     private String numbersHexNo0x = "31323334353637383930";
-
+        
     @SuppressWarnings("unused")
     @BeforeClass
     public static void getCoverage() {
@@ -179,22 +181,11 @@ public class JU_Hash {
         assertEquals(lowersDec, new String(Hash.fromHex(lowersHex)));
         assertEquals(numbersDec, new String(Hash.fromHex(numbersHex)));
 
-        try {
-            // This string doesn't begin with "0x"
-            Hash.fromHex("0X65");
-            fail("Should have thrown CadiException");
-        } catch (CadiException e) {
-            assertEquals("HexString must start with \"0x\"", e.getMessage());
-        }
+        // This string doesn't begin with "0x"
+        assertNull(Hash.fromHex("0X65"));
 
-        try {
             // This string has invalid hex characters
-            Hash.fromHex("0xQ");
-            fail("Should have thrown CadiException");
-        } catch (CadiException e) {
-            // 81 is dec(Q)
-            assertEquals("Invalid char '81' in HexString", e.getMessage());
-        }
+        assertNull(Hash.fromHex("0xQ"));
     }
 
     @Test
@@ -203,16 +194,32 @@ public class JU_Hash {
         assertEquals(lowersDec, new String(Hash.fromHexNo0x(lowersHexNo0x1)));
         assertEquals(uppersDec, new String(Hash.fromHexNo0x(uppersHexNo0x2)));
         assertEquals(lowersDec, new String(Hash.fromHexNo0x(lowersHexNo0x2)));
-        assertEquals(numbersDec, new String(Hash.fromHexNo0x(numbersHexNo0x)));
         byte[] output = Hash.fromHexNo0x("ABC");
-        assertEquals(new String(new byte[] {(byte)0x0A, (byte)0xB0}), new String(output));
+        assertEquals(new String(new byte[] {(byte)0x0A, (byte)0xBC}), new String(output));
         assertNull(Hash.fromHexNo0x("~~"));
     }
-//
-//    @Test
-//    public void aaf_941() throws Exception {
-//        // User notes: From reported error "aaf" not coded right
-//
-//
-//    }
+    
+    @Test
+    public void aaf_941() throws Exception {
+        // User notes: From reported error "aaf" not coded right for odd digits
+    	// Note:  In the original concept, this isn't a valid Hex digit.  It has to do with whether to assume an initial 
+    	// char of "0" if left out.
+    	
+    	String sample = "aaf";
+    	byte[] bytes = Hash.fromHexNo0x(sample);
+    	String back = Hash.toHexNo0x(bytes);
+    	// Note: We don't presume to know that someone left off leading 0 on start.
+    	assertEquals("0aaf", back);
+    	
+    	sample = "0x0aaf";
+    	bytes = Hash.fromHex(sample);
+    	back = Hash.toHex(bytes);
+    	assertEquals(sample, back);
+    	
+    	// Assumed leading zero.  Note, we ALWAYS translate back with leading zero.  
+    	bytes = Hash.fromHex("0xaaf");
+    	back = Hash.toHex(bytes);
+    	assertEquals(sample, back);
+
+    }
 }