One more fix for #157, this time for negative-number parsing branch (which is different from pos)

Author: cowtowncoder

src/main/java/com/fasterxml/jackson/core/json/UTF8StreamJsonParser.java

@@ -1256,7 +1256,7 @@ protected JsonToken _parseNegNumber() throws IOException
 
         // And then figure out how far we can read without further checks
         // for either input or output
-        int end = _inputPtr + outBuf.length;
+        int end = _inputPtr + outBuf.length - outPtr;
         if (end > _inputEnd) {
             end = _inputEnd;
         }

src/test/java/com/fasterxml/jackson/core/json/TestNumericValues.java

@@ -447,6 +447,32 @@ private void _testLongNumbers(JsonFactory f, String num, boolean useStream) thro
         assertToken(JsonToken.END_ARRAY, jp.nextToken());
     }
 
+    // and alternate take on for #157 (with negative num)
+    public void testLongNumbers2() throws Exception
+    {
+        StringBuilder input = new StringBuilder();
+        // test this with negative
+        input.append('-');
+        for (int i = 0; i < 2100; i++) {
+            input.append(1);
+        }
+        final String DOC = input.toString();
+        JsonFactory f = new JsonFactory();
+        _testIssue160LongNumbers(f, DOC, false);
+        _testIssue160LongNumbers(f, DOC, true);
+    }
+
+    private void _testIssue160LongNumbers(JsonFactory f, String doc, boolean useStream) throws Exception
+    {
+        JsonParser jp = useStream
+                ? FACTORY.createParser(doc.getBytes("UTF-8"))
+                        : FACTORY.createParser(doc);
+        assertToken(JsonToken.VALUE_NUMBER_INT, jp.nextToken());
+        BigInteger v = jp.getBigIntegerValue();
+        assertNull(jp.nextToken());
+        assertEquals(doc, v.toString());
+    }
+
     /*
     /**********************************************************
     /* Tests for invalid access