Bit more checking wrt JsonLocation (and #739)

Author: cowtowncoder

src/main/java/com/fasterxml/jackson/core/io/ContentReference.java

@@ -360,6 +360,12 @@ public boolean equals(Object other)
         if (!(other instanceof ContentReference)) return false;
         ContentReference otherSrc = (ContentReference) other;
 
+        // 16-Jan-2022, tatu: First ensure offset/length the same
+        if ((_offset != otherSrc._offset)
+                || (_length != otherSrc._length)) {
+            return false;
+        }
+
         // 16-Jan-2022, tatu: As per [core#739] we'll want to consider some
         //   but not all content cases with real equality: the concern here is
         //   to avoid expensive comparisons and/or possible security issues
@@ -370,7 +376,7 @@ public boolean equals(Object other)
         } else if (otherRaw == null) {
             return false;
         }
-        
+
         if ((_rawContent instanceof File)
                 || (_rawContent instanceof URL)
                 || (_rawContent instanceof URI)

src/test/java/com/fasterxml/jackson/core/JsonLocationTest.java

@@ -135,6 +135,21 @@ public void testLocationEquality() throws Exception
         JsonLocation loc2 = new JsonLocation(_sourceRef(src2),
                 10L, 10L, 1, 2);
         assertEquals(loc1, loc2);
+
+        // Also make sure to consider offset/length
+        final byte[] bogus = "BOGUS".getBytes();
+
+        // If same, equals:
+        assertEquals(new JsonLocation(_sourceRef(bogus, 0, 5), 5L, 0L, 1, 2),
+                new JsonLocation(_sourceRef(bogus, 0, 5), 5L, 0L, 1, 2));
+
+        // If different, not equals
+        loc1 = new JsonLocation(_sourceRef(bogus, 0, 5),
+                5L, 0L, 1, 2);
+        loc2 = new JsonLocation(_sourceRef(bogus, 1, 4),
+                5L, 0L, 1, 2);
+        assertFalse(loc1.equals(loc2));
+        assertFalse(loc2.equals(loc1));
     }
 
     private ContentReference _sourceRef(String rawSrc) {
@@ -149,6 +164,10 @@ private ContentReference _sourceRef(byte[] rawSrc) {
         return ContentReference.construct(true, rawSrc, 0, rawSrc.length);
     }
 
+    private ContentReference _sourceRef(byte[] rawSrc, int offset, int length) {
+        return ContentReference.construct(true, rawSrc, offset, length);
+    }
+
     private ContentReference _sourceRef(InputStream rawSrc) {
         return ContentReference.construct(true, rawSrc, -1, -1);
     }
@@ -160,4 +179,4 @@ private ContentReference _sourceRef(File rawSrc) {
     private ContentReference _rawSourceRef(boolean textual, Object rawSrc) {
         return ContentReference.rawReference(textual, rawSrc);
     }
-}
+}