fix: SDK crash on conversion of double type range values to long type (#342)

Author: TobiasPott

Parse.Tests/JsonTests.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.Globalization;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Parse.Infrastructure.Utilities;
 
@@ -250,5 +251,29 @@ public void TestSpecialJsonNumbersAndModifiers()
 
             Assert.AreEqual(123456789123456789, (JsonUtilities.Parse("{ \"mura\": 123456789123456789 }") as IDictionary)["mura"]);
         }
+
+
+        [TestMethod]
+        public void TestJsonNumbersAndValueRanges()
+        {
+            //Assert.ThrowsException<ArgumentException>(() => JsonUtilities.Parse("+123456789"));
+            Assert.IsInstanceOfType((JsonUtilities.Parse("{ \"long\": " + long.MaxValue + " }") as IDictionary)["long"], typeof(long));
+            Assert.IsInstanceOfType((JsonUtilities.Parse("{ \"long\": " + long.MinValue + " }") as IDictionary)["long"], typeof(long));
+
+            Assert.AreEqual((JsonUtilities.Parse("{ \"long\": " + long.MaxValue + " }") as IDictionary)["long"], long.MaxValue);
+            Assert.AreEqual((JsonUtilities.Parse("{ \"long\": " + long.MinValue + " }") as IDictionary)["long"], long.MinValue);
+
+
+            Assert.IsInstanceOfType((JsonUtilities.Parse("{ \"double\": " + double.MaxValue.ToString(CultureInfo.InvariantCulture) + " }") as IDictionary)["double"], typeof(double));
+            Assert.IsInstanceOfType((JsonUtilities.Parse("{ \"double\": " + double.MinValue.ToString(CultureInfo.InvariantCulture) + " }") as IDictionary)["double"], typeof(double));
+
+            Assert.AreEqual((JsonUtilities.Parse("{ \"double\": " + double.MaxValue.ToString(CultureInfo.InvariantCulture) + " }") as IDictionary)["double"], double.MaxValue);
+            Assert.AreEqual((JsonUtilities.Parse("{ \"double\": " + double.MinValue.ToString(CultureInfo.InvariantCulture) + " }") as IDictionary)["double"], double.MinValue);
+
+            double outOfInt64RangeValue = -9223372036854776000d;
+            Assert.IsInstanceOfType((JsonUtilities.Parse("{ \"double\": " + outOfInt64RangeValue.ToString(CultureInfo.InvariantCulture) + " }") as IDictionary)["double"], typeof(double));
+            Assert.AreEqual((JsonUtilities.Parse("{ \"double\": " + outOfInt64RangeValue.ToString(CultureInfo.InvariantCulture) + " }") as IDictionary)["double"], outOfInt64RangeValue);
+        }
+
     }
 }

Parse/Infrastructure/Utilities/JsonUtilities.cs

@@ -212,8 +212,20 @@ private bool ParseNumber(out object output)
                 }
                 else
                 {
-                    output = Int64.Parse(m.Value, CultureInfo.InvariantCulture);
-                    return true;
+                    // try to parse to a long assuming it is an integer value (this might fail due to value range differences when storing as double without decimal point or exponent)
+                    if (Int64.TryParse(m.Value, NumberStyles.Integer, CultureInfo.InvariantCulture, out long longValue))
+                    {
+                        output = longValue;
+                        return true;
+                    }
+                    // try to parse as double again (most likely due to value range exceeding long type
+                    else if (Double.TryParse(m.Value, NumberStyles.Any, CultureInfo.InvariantCulture, out double doubleValue))
+                    {
+                        output = doubleValue;
+                        return true;
+                    }
+                    else
+                        return false;
                 }
             }