mirror of
https://github.com/RRQM/TouchSocket.git
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225 lines
8.0 KiB
C#
225 lines
8.0 KiB
C#
//------------------------------------------------------------------------------
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// 此代码版权（除特别声明或在RRQMCore.XREF命名空间的代码）归作者本人若汝棋茗所有
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// 源代码使用协议遵循本仓库的开源协议及附加协议，若本仓库没有设置，则按MIT开源协议授权
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// CSDN博客：https://blog.csdn.net/qq_40374647
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// 哔哩哔哩视频：https://space.bilibili.com/94253567
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// Gitee源代码仓库：https://gitee.com/RRQM_Home
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// Github源代码仓库：https://github.com/RRQM
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// 交流QQ群：234762506
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// 感谢您的下载和使用
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//------------------------------------------------------------------------------
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//------------------------------------------------------------------------------
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#region License
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// Copyright (c) 2007 James Newton-King
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without
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// restriction, including without limitation the rights to use,
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// copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following
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// conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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#endregion License
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#if HAVE_LINQ || HAVE_ADO_NET
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using System;
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using System.Globalization;
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using RRQMCore.XREF.Newtonsoft.Json.Utilities;
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using System.Collections.Generic;
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#if HAVE_ADO_NET
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using System.Data.SqlTypes;
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#endif
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namespace RRQMCore.XREF.Newtonsoft.Json.Converters
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{
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/// <summary>
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/// Converts a binary value to and from a base 64 string value.
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/// </summary>
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public class BinaryConverter : JsonConverter
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{
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#if HAVE_LINQ
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private const string BinaryTypeName = "System.Data.Linq.Binary";
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private const string BinaryToArrayName = "ToArray";
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private static ReflectionObject _reflectionObject;
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#endif
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/// <summary>
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/// Writes the JSON representation of the object.
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/// </summary>
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/// <param name="writer">The <see cref="JsonWriter"/> to write to.</param>
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/// <param name="value">The value.</param>
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/// <param name="serializer">The calling serializer.</param>
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public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
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{
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if (value == null)
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{
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writer.WriteNull();
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return;
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}
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byte[] data = GetByteArray(value);
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writer.WriteValue(data);
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}
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private byte[] GetByteArray(object value)
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{
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#if HAVE_LINQ
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if (value.GetType().FullName == BinaryTypeName)
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{
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EnsureReflectionObject(value.GetType());
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return (byte[])_reflectionObject.GetValue(value, BinaryToArrayName);
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}
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#endif
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#if HAVE_ADO_NET
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if (value is SqlBinary binary)
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{
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return binary.Value;
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}
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#endif
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throw new JsonSerializationException("Unexpected value type when writing binary: {0}".FormatWith(CultureInfo.InvariantCulture, value.GetType()));
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}
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#if HAVE_LINQ
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private static void EnsureReflectionObject(Type t)
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{
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if (_reflectionObject == null)
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{
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_reflectionObject = ReflectionObject.Create(t, t.GetConstructor(new[] { typeof(byte[]) }), BinaryToArrayName);
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}
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}
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#endif
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/// <summary>
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/// Reads the JSON representation of the object.
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/// </summary>
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/// <param name="reader">The <see cref="JsonReader"/> to read from.</param>
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/// <param name="objectType">Type of the object.</param>
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/// <param name="existingValue">The existing value of object being read.</param>
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/// <param name="serializer">The calling serializer.</param>
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/// <returns>The object value.</returns>
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public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
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{
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if (reader.TokenType == JsonToken.Null)
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{
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if (!ReflectionUtils.IsNullable(objectType))
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{
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throw JsonSerializationException.Create(reader, "Cannot convert null value to {0}.".FormatWith(CultureInfo.InvariantCulture, objectType));
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}
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return null;
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}
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byte[] data;
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if (reader.TokenType == JsonToken.StartArray)
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{
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data = ReadByteArray(reader);
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}
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else if (reader.TokenType == JsonToken.String)
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{
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// current token is already at base64 string
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// unable to call ReadAsBytes so do it the old fashion way
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string encodedData = reader.Value.ToString();
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data = Convert.FromBase64String(encodedData);
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}
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else
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{
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throw JsonSerializationException.Create(reader, "Unexpected token parsing binary. Expected String or StartArray, got {0}.".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
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}
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Type t = (ReflectionUtils.IsNullableType(objectType))
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? Nullable.GetUnderlyingType(objectType)
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: objectType;
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#if HAVE_LINQ
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if (t.FullName == BinaryTypeName)
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{
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EnsureReflectionObject(t);
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return _reflectionObject.Creator(data);
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}
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#endif
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#if HAVE_ADO_NET
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if (t == typeof(SqlBinary))
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{
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return new SqlBinary(data);
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}
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#endif
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throw JsonSerializationException.Create(reader, "Unexpected object type when writing binary: {0}".FormatWith(CultureInfo.InvariantCulture, objectType));
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}
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private byte[] ReadByteArray(JsonReader reader)
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{
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List<byte> byteList = new List<byte>();
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while (reader.Read())
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{
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switch (reader.TokenType)
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{
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case JsonToken.Integer:
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byteList.Add(Convert.ToByte(reader.Value, CultureInfo.InvariantCulture));
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break;
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case JsonToken.EndArray:
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return byteList.ToArray();
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case JsonToken.Comment:
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// skip
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break;
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default:
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throw JsonSerializationException.Create(reader, "Unexpected token when reading bytes: {0}".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
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}
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}
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throw JsonSerializationException.Create(reader, "Unexpected end when reading bytes.");
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}
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/// <summary>
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/// Determines whether this instance can convert the specified object type.
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/// </summary>
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/// <param name="objectType">Type of the object.</param>
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/// <returns>
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/// <c>true</c> if this instance can convert the specified object type; otherwise, <c>false</c>.
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/// </returns>
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public override bool CanConvert(Type objectType)
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{
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#if HAVE_LINQ
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if (objectType.FullName == BinaryTypeName)
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{
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return true;
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}
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#endif
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#if HAVE_ADO_NET
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if (objectType == typeof(SqlBinary) || objectType == typeof(SqlBinary?))
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{
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return true;
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}
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#endif
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return false;
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}
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}
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}
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#endif |