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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
namespace System.Runtime.Serialization.Formatters.Binary
{
// Routines to convert between the runtime type and the type as it appears on the wire
internal static class BinaryTypeConverter
{
// From the type create the BinaryTypeEnum and typeInformation which describes the type on the wire
internal static BinaryTypeEnum GetBinaryTypeInfo(Type type, WriteObjectInfo? objectInfo, string? typeName, ObjectWriter objectWriter, out object? typeInformation, out int assemId)
{
BinaryTypeEnum binaryTypeEnum;
assemId = 0;
typeInformation = null;
if (ReferenceEquals(type, Converter.s_typeofString))
{
binaryTypeEnum = BinaryTypeEnum.String;
}
else if (((objectInfo == null) || ((objectInfo != null) && !objectInfo._isSi)) && (ReferenceEquals(type, Converter.s_typeofObject)))
{
// If objectInfo.Si then can be a surrogate which will change the type
binaryTypeEnum = BinaryTypeEnum.Object;
}
else if (ReferenceEquals(type, Converter.s_typeofStringArray))
{
binaryTypeEnum = BinaryTypeEnum.StringArray;
}
else if (ReferenceEquals(type, Converter.s_typeofObjectArray))
{
binaryTypeEnum = BinaryTypeEnum.ObjectArray;
}
else if (Converter.IsPrimitiveArray(type, out typeInformation))
{
binaryTypeEnum = BinaryTypeEnum.PrimitiveArray;
}
else
{
InternalPrimitiveTypeE primitiveTypeEnum = objectWriter.ToCode(type);
switch (primitiveTypeEnum)
{
case InternalPrimitiveTypeE.Invalid:
string? assembly;
if (objectInfo == null)
{
assembly = type.Assembly.FullName;
typeInformation = type.FullName;
}
else
{
assembly = objectInfo.GetAssemblyString();
typeInformation = objectInfo.GetTypeFullName();
}
Debug.Assert(assembly != null);
if (assembly.Equals(Converter.s_urtAssemblyString) || assembly.Equals(Converter.s_urtAlternativeAssemblyString))
{
binaryTypeEnum = BinaryTypeEnum.ObjectUrt;
assemId = 0;
}
else
{
binaryTypeEnum = BinaryTypeEnum.ObjectUser;
Debug.Assert(objectInfo != null, "[BinaryConverter.GetBinaryTypeInfo]objectInfo null for user object");
assemId = (int)objectInfo._assemId;
if (assemId == 0)
{
throw new SerializationException(SR.Format(SR.Serialization_AssemblyId, typeInformation));
}
}
break;
default:
binaryTypeEnum = BinaryTypeEnum.Primitive;
typeInformation = primitiveTypeEnum;
break;
}
}
return binaryTypeEnum;
}
// Used for non Si types when Parsing
internal static BinaryTypeEnum GetParserBinaryTypeInfo(Type type, out object? typeInformation)
{
BinaryTypeEnum binaryTypeEnum;
typeInformation = null;
if (ReferenceEquals(type, Converter.s_typeofString))
{
binaryTypeEnum = BinaryTypeEnum.String;
}
else if (ReferenceEquals(type, Converter.s_typeofObject))
{
binaryTypeEnum = BinaryTypeEnum.Object;
}
else if (ReferenceEquals(type, Converter.s_typeofObjectArray))
{
binaryTypeEnum = BinaryTypeEnum.ObjectArray;
}
else if (ReferenceEquals(type, Converter.s_typeofStringArray))
{
binaryTypeEnum = BinaryTypeEnum.StringArray;
}
else if (Converter.IsPrimitiveArray(type, out typeInformation))
{
binaryTypeEnum = BinaryTypeEnum.PrimitiveArray;
}
else
{
InternalPrimitiveTypeE primitiveTypeEnum = Converter.ToCode(type);
switch (primitiveTypeEnum)
{
case InternalPrimitiveTypeE.Invalid:
binaryTypeEnum = type.Assembly == Converter.s_urtAssembly ?
BinaryTypeEnum.ObjectUrt :
BinaryTypeEnum.ObjectUser;
typeInformation = type.FullName;
break;
default:
binaryTypeEnum = BinaryTypeEnum.Primitive;
typeInformation = primitiveTypeEnum;
break;
}
}
return binaryTypeEnum;
}
// Writes the type information on the wire
internal static void WriteTypeInfo(BinaryTypeEnum binaryTypeEnum, object? typeInformation, int assemId, BinaryFormatterWriter output)
{
switch (binaryTypeEnum)
{
case BinaryTypeEnum.Primitive:
case BinaryTypeEnum.PrimitiveArray:
Debug.Assert(typeInformation != null, "[BinaryConverter.WriteTypeInfo]typeInformation!=null");
output.WriteByte((byte)((InternalPrimitiveTypeE)typeInformation));
break;
case BinaryTypeEnum.String:
case BinaryTypeEnum.Object:
case BinaryTypeEnum.StringArray:
case BinaryTypeEnum.ObjectArray:
break;
case BinaryTypeEnum.ObjectUrt:
Debug.Assert(typeInformation != null, "[BinaryConverter.WriteTypeInfo]typeInformation!=null");
output.WriteString(typeInformation.ToString()!);
break;
case BinaryTypeEnum.ObjectUser:
Debug.Assert(typeInformation != null, "[BinaryConverter.WriteTypeInfo]typeInformation!=null");
output.WriteString(typeInformation.ToString()!);
output.WriteInt32(assemId);
break;
default:
throw new SerializationException(SR.Format(SR.Serialization_TypeWrite, binaryTypeEnum.ToString()));
}
}
// Reads the type information from the wire
internal static object ReadTypeInfo(BinaryTypeEnum binaryTypeEnum, BinaryParser input, out int assemId)
{
object var = null!;
int readAssemId = 0;
switch (binaryTypeEnum)
{
case BinaryTypeEnum.Primitive:
case BinaryTypeEnum.PrimitiveArray:
var = (InternalPrimitiveTypeE)input.ReadByte();
break;
case BinaryTypeEnum.String:
case BinaryTypeEnum.Object:
case BinaryTypeEnum.StringArray:
case BinaryTypeEnum.ObjectArray:
break;
case BinaryTypeEnum.ObjectUrt:
var = input.ReadString();
break;
case BinaryTypeEnum.ObjectUser:
var = input.ReadString();
readAssemId = input.ReadInt32();
break;
default:
throw new SerializationException(SR.Format(SR.Serialization_TypeRead, binaryTypeEnum.ToString()));
}
assemId = readAssemId;
return var;
}
// Given the wire type information, returns the actual type and additional information
[RequiresUnreferencedCode("Types might be removed")]
internal static void TypeFromInfo(BinaryTypeEnum binaryTypeEnum,
object? typeInformation,
ObjectReader objectReader,
BinaryAssemblyInfo? assemblyInfo,
out InternalPrimitiveTypeE primitiveTypeEnum,
out string? typeString,
out Type? type,
out bool isVariant)
{
isVariant = false;
primitiveTypeEnum = InternalPrimitiveTypeE.Invalid;
typeString = null;
type = null;
switch (binaryTypeEnum)
{
case BinaryTypeEnum.Primitive:
primitiveTypeEnum = (InternalPrimitiveTypeE)typeInformation!;
typeString = Converter.ToComType(primitiveTypeEnum);
type = Converter.ToType(primitiveTypeEnum);
break;
case BinaryTypeEnum.String:
type = Converter.s_typeofString;
break;
case BinaryTypeEnum.Object:
type = Converter.s_typeofObject;
isVariant = true;
break;
case BinaryTypeEnum.ObjectArray:
type = Converter.s_typeofObjectArray;
break;
case BinaryTypeEnum.StringArray:
type = Converter.s_typeofStringArray;
break;
case BinaryTypeEnum.PrimitiveArray:
primitiveTypeEnum = (InternalPrimitiveTypeE)typeInformation!;
type = Converter.ToArrayType(primitiveTypeEnum);
break;
case BinaryTypeEnum.ObjectUser:
case BinaryTypeEnum.ObjectUrt:
if (typeInformation != null)
{
typeString = typeInformation.ToString();
type = objectReader.GetType(assemblyInfo!, typeString!);
if (ReferenceEquals(type, Converter.s_typeofObject))
{
isVariant = true;
}
}
break;
default:
throw new SerializationException(SR.Format(SR.Serialization_TypeRead, binaryTypeEnum.ToString()));
}
}
}
}
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