fix write float/double

taowen · taowen · commit 6420e136b9cc · 2017-01-21T17:11:54.000+08:00
diff --git a/src/main/java/com/jsoniter/output/StreamImplNumber.java b/src/main/java/com/jsoniter/output/StreamImplNumber.java
@@ -219,11 +219,15 @@ public static final void writeFloat(JsonStream stream, float val) throws IOExcep
             stream.write('-');
             val = -val;
         }
+        if (val > 0x4ffffff) {
+            stream.writeRaw(Float.toString(val));
+            return;
+        }
         int precision = 6;
         int exp = 1000000; // 6
-        long lval = (long)val;
-        stream.writeVal(lval);
-        long fval = (long)((val - lval) * exp);
+        long lval = (long)(val * exp + 0.5);
+        stream.writeVal(lval / exp);
+        long fval = lval % exp;
         if (fval == 0) {
             return;
         }
@@ -245,11 +249,15 @@ public static final void writeDouble(JsonStream stream, double val) throws IOExc
             val = -val;
             stream.write('-');
         }
+        if (val > 0x4ffffff) {
+            stream.writeRaw(Double.toString(val));
+            return;
+        }
         int precision = 6;
         int exp = 1000000; // 6
-        long lval = (long)val;
-        stream.writeVal(lval);
-        long fval = (long)((val - lval) * exp);
+        long lval = (long)(val * exp + 0.5);
+        stream.writeVal(lval / exp);
+        long fval = lval % exp;
         if (fval == 0) {
             return;
         }
diff --git a/src/test/java/com/jsoniter/output/TestNative.java b/src/test/java/com/jsoniter/output/TestNative.java
@@ -115,15 +115,21 @@ public void test_float3() throws IOException {
     }
 
     public void test_big_float() throws IOException {
-        stream.writeVal(83886082f);
+        stream.writeVal((float)0x4ffffff);
         stream.close();
         assertEquals("83886080", baos.toString());
     }
 
     public void test_double() throws IOException {
-        stream.writeVal(0.00001d);
+        stream.writeVal(1.001d);
         stream.close();
-        assertEquals("0.00001", baos.toString());
+        assertEquals("1.001", baos.toString());
+    }
+
+    public void test_large_double() throws IOException {
+        stream.writeVal(Double.MAX_VALUE);
+        stream.close();
+        assertEquals("1.7976931348623157E308", baos.toString());
     }
 
     public void test_boolean() throws IOException {
