Backport fix #152 to 2.3 branch

Author: cowtowncoder

release-notes/VERSION

@@ -1,12 +1,13 @@
 Project: jackson-core
-Version: 2.3.4 (17-Jul-2014)
+Version: 2.3.5 (xx-xxx-2014)
 
-No changes.
+#152: Exception for property names longer than 256k
 
 ------------------------------------------------------------------------
 === History: ===
 ------------------------------------------------------------------------
 
+2.3.4 (17-Jul-2014)
 2.3.3 (10-Apr-2014)
 
 No changes since 2.3.2.

src/main/java/com/fasterxml/jackson/core/util/TextBuffer.java

@@ -575,8 +575,11 @@ public char[] expandCurrentSegment()
         final char[] curr = _currentSegment;
         // Let's grow by 50%
         final int len = curr.length;
-        // Must grow by at least 1 char, no matter what
-        int newLen = (len == MAX_SEGMENT_LEN) ? (MAX_SEGMENT_LEN+1) : Math.min(MAX_SEGMENT_LEN, len + (len >> 1));
+        int newLen = len + (len >> 1);
+	// but above intended maximum, slow to increase by 25%
+	if (newLen > MAX_SEGMENT_LEN) {
+	    newLen = len + (len >> 2);
+	}
         return (_currentSegment = ArraysCompat.copyOf(curr, newLen));
     }
 

src/test/java/com/fasterxml/jackson/core/util/TestTextBuffer.java

@@ -62,4 +62,19 @@ public void testLongAppend()
          assertEquals(len+2, tb.size());
          assertEquals(EXP, tb.contentsAsString());
       }
+
+      // [Core#152]
+      public void testExpand()
+      {
+          TextBuffer tb = new TextBuffer(new BufferRecycler());
+          char[] buf = tb.getCurrentSegment();
+
+          while (buf.length < 500 * 1000) {
+              char[] old = buf;
+              buf = tb.expandCurrentSegment();
+              if (old.length >= buf.length) {
+                  fail("Expected buffer of "+old.length+" to expand, did not, length now "+buf.length);
+              }
+          }
+      }
 }