fix #115 int/long should not have leading zero

Author: taowen

src/main/java/com/jsoniter/IterImplNumber.java

@@ -31,6 +31,8 @@ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  */
 package com.jsoniter;
 
+import com.jsoniter.spi.JsonException;
+
 import java.io.IOException;
 
 class IterImplNumber {
@@ -85,6 +87,8 @@ public static final int readInt(final JsonIterator iter) throws IOException {
         byte c = IterImpl.nextToken(iter);
         if (c == '-') {
             return -IterImpl.readPositiveInt(iter, IterImpl.readByte(iter));
+        } else if (c == '0') {
+            throw new JsonException("leading zero is invalid number");
         } else {
             return IterImpl.readPositiveInt(iter, c);
         }
@@ -94,6 +98,8 @@ public static final long readLong(JsonIterator iter) throws IOException {
         byte c = IterImpl.nextToken(iter);
         if (c == '-') {
             return -IterImpl.readPositiveLong(iter, IterImpl.readByte(iter));
+        } else if (c == '0') {
+            throw new JsonException("leading zero is invalid number");
         } else {
             return IterImpl.readPositiveLong(iter, c);
         }

src/test/java/com/jsoniter/TestInteger.java

@@ -92,6 +92,16 @@ public void test_leading_zero() throws IOException {
             fail();
         } catch (JsonException e) {
         }
+        try {
+            JsonIterator.deserialize("001", long.class);
+            fail();
+        } catch (JsonException e) {
+        }
+        try {
+            JsonIterator.deserialize("001");
+            fail();
+        } catch (JsonException e) {
+        }
     }
 
     public void test_max_int() throws IOException {