BinaryConverter
Converts a binary value to and from a base 64 string value.
using Newtonsoft.Json.Utilities;
using System;
using System.Collections.Generic;
using System.Globalization;
namespace Newtonsoft.Json.Converters
{
public class BinaryConverter : JsonConverter
{
private const string BinaryTypeName = "System.Data.Linq.Binary";
private const string BinaryToArrayName = "ToArray";
private static ReflectionObject _reflectionObject;
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
if (value == null)
writer.WriteNull();
else {
byte[] byteArray = GetByteArray(value);
writer.WriteValue(byteArray);
}
}
private byte[] GetByteArray(object value)
{
if (value.GetType().FullName == "System.Data.Linq.Binary") {
EnsureReflectionObject(value.GetType());
return (byte[])_reflectionObject.GetValue(value, "ToArray");
}
throw new JsonSerializationException("Unexpected value type when writing binary: {0}".FormatWith(CultureInfo.InvariantCulture, value.GetType()));
}
private static void EnsureReflectionObject(Type t)
{
if (_reflectionObject == null)
_reflectionObject = ReflectionObject.Create(t, TypeExtensions.GetConstructor(t, new Type[1] {
typeof(byte[])
}), "ToArray");
}
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
if (reader.TokenType == JsonToken.Null) {
if (!ReflectionUtils.IsNullable(objectType))
throw JsonSerializationException.Create(reader, "Cannot convert null value to {0}.".FormatWith(CultureInfo.InvariantCulture, objectType));
return null;
}
byte[] array;
if (reader.TokenType == JsonToken.StartArray)
array = ReadByteArray(reader);
else {
if (reader.TokenType != JsonToken.String)
throw JsonSerializationException.Create(reader, "Unexpected token parsing binary. Expected String or StartArray, got {0}.".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
array = Convert.FromBase64String(reader.Value.ToString());
}
Type type = ReflectionUtils.IsNullableType(objectType) ? Nullable.GetUnderlyingType(objectType) : objectType;
if (type.FullName == "System.Data.Linq.Binary") {
EnsureReflectionObject(type);
return _reflectionObject.Creator(array);
}
throw JsonSerializationException.Create(reader, "Unexpected object type when writing binary: {0}".FormatWith(CultureInfo.InvariantCulture, objectType));
}
private byte[] ReadByteArray(JsonReader reader)
{
List<byte> list = new List<byte>();
while (reader.Read()) {
switch (reader.TokenType) {
case JsonToken.Integer:
list.Add(Convert.ToByte(reader.Value, CultureInfo.InvariantCulture));
break;
case JsonToken.EndArray:
return list.ToArray();
default:
throw JsonSerializationException.Create(reader, "Unexpected token when reading bytes: {0}".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
case JsonToken.Comment:
break;
}
}
throw JsonSerializationException.Create(reader, "Unexpected end when reading bytes.");
}
public override bool CanConvert(Type objectType)
{
if (objectType.FullName == "System.Data.Linq.Binary")
return true;
return false;
}
}
}