-Fixed JSON string encoder not getting buffer from buffer pool

Src/Newtonsoft.Json.Tests/DemoTests.cs

@@ -609,23 +609,25 @@ namespace Newtonsoft.Json.Tests
 
             Assert.AreEqual(4, value.Count);
         }
-
-        public class JsonArrayPool : IArrayPool<char>
-        {
-            public static readonly JsonArrayPool Instance = new JsonArrayPool();
-
-            public char[] Rent(int minimumLength)
-            {
-                // use System.Buffers shared pool
-                return ArrayPool<char>.Shared.Rent(minimumLength);
-            }
-
-            public void Return(char[] array)
-            {
-                // use System.Buffers shared pool
-                ArrayPool<char>.Shared.Return(array);
-            }
-        }
 #endif
     }
+
+#if !(NET20 || NET35 || NET40 || NETFX_CORE || PORTABLE || PORTABLE40 || DNXCORE50)
+    public class JsonArrayPool : IArrayPool<char>
+    {
+        public static readonly JsonArrayPool Instance = new JsonArrayPool();
+
+        public char[] Rent(int minimumLength)
+        {
+            // use System.Buffers shared pool
+            return ArrayPool<char>.Shared.Rent(minimumLength);
+        }
+
+        public void Return(char[] array)
+        {
+            // use System.Buffers shared pool
+            ArrayPool<char>.Shared.Return(array);
+        }
+    }
+#endif
 }

Src/Newtonsoft.Json.Tests/JsonTextWriterTest.cs

@@ -49,6 +49,7 @@ using NUnit.Framework;
 using Newtonsoft.Json;
 using System.IO;
 using Newtonsoft.Json.Converters;
+using Newtonsoft.Json.Linq;
 using Newtonsoft.Json.Utilities;
 
 namespace Newtonsoft.Json.Tests
@@ -136,6 +137,33 @@ namespace Newtonsoft.Json.Tests
             Assert.AreEqual(1, arrayPool.FreeArrays.Count);
         }
 
+#if !(NET20 || NET35 || NET40 || NETFX_CORE || PORTABLE || PORTABLE40 || DNXCORE50)
+        [Test]
+        public void BufferErroringWithInvalidSize()
+        {
+            JObject o = new JObject
+            {
+                {"BodyHtml", "<h3>Title!</h3>" + Environment.NewLine + new string(' ', 100) + "<p>Content!</p>"}
+            };
+
+            JsonArrayPool arrayPool = new JsonArrayPool();
+
+            StringWriter sw = new StringWriter();
+            using (JsonTextWriter writer = new JsonTextWriter(sw))
+            {
+                writer.ArrayPool = arrayPool;
+
+                o.WriteTo(writer);
+            }
+
+            string result = o.ToString();
+
+            Assert.AreEqual(@"{
+  ""BodyHtml"": ""<h3>Title!</h3>\r\n                                                                                                    <p>Content!</p>""
+}", result);
+        }
+#endif
+
         [Test]
         public void NewLine()
         {

Src/Newtonsoft.Json.Tests/Newtonsoft.Json.Tests.project.json

@@ -3,7 +3,7 @@
     "Autofac": "4.0.0-beta7-130",
     "FSharp.Core": "4.0.0.1",
     "NUnit": "2.6.2",
-    "System.Buffers": "4.0.0-rc2-23623",
+    "System.Buffers": "4.0.0-rc2-23826",
     "System.Collections.Immutable": "1.1.37"
   },
   "frameworks": {

Src/Newtonsoft.Json.Tests/project.json

@@ -33,7 +33,7 @@
         "FSharp.Core": "4.0.0.1",
         "NUnit": "2.6.4",
         "System.Collections.Immutable": "1.1.37",
-        "System.Buffers": "4.0.0-rc2-23623"
+        "System.Buffers": "4.0.0-rc2-23826"
       }
     },
     "net40": {

Src/Newtonsoft.Json/Utilities/JavaScriptUtils.cs

@@ -286,7 +286,7 @@ namespace Newtonsoft.Json.Utilities
 
                     if (writeBuffer == null || writeBuffer.Length < length)
                     {
-                        writeBuffer = new char[length];
+                        writeBuffer = BufferUtils.EnsureBufferSize(bufferPool, length, writeBuffer);
                     }
 
                     s.CopyTo(lastWritePosition, writeBuffer, 0, length);