/// <summary>
/// Reads a single security attribute at the current position of the provided stream reader.
/// </summary>
/// <param name="image">The image the signature resides in.</param>
/// <param name="reader">The reader to use.</param>
/// <returns>The read attribute.</returns>
public static SecurityAttributeSignature FromReader(MetadataImage image, IBinaryStreamReader reader)
{
var signature = new SecurityAttributeSignature
{
TypeName = reader.ReadSerString(),
};
reader.ReadCompressedUInt32();
if (!reader.TryReadCompressedUInt32(out uint argumentCount))
{
return(signature);
}
if (argumentCount == 0)
{
return(signature);
}
for (int i = 0; i < argumentCount; i++)
{
signature.NamedArguments.Add(CustomAttributeNamedArgument.FromReader(image, reader));
}
return(signature);
}
protected string ReadString(IBinaryStreamReader reader)
{
var offset = (uint)(reader.Position - reader.StartPosition);
string value;
if (_cachedStrings.TryGetValue(offset, out value))
{
reader.Position += 1 + Encoding.Unicode.GetByteCount(value) + 1;
}
else
{
var length = reader.ReadCompressedUInt32();
if (length <= 0)
{
return(string.Empty);
}
value = Encoding.Unicode.GetString(reader.ReadBytes((int)length - 1));
reader.Position++;
_cachedStrings.Add(offset, value);
}
return(value);
}
public static new LocalVariableSignature FromReader(MetadataHeader header, IBinaryStreamReader reader)
{
var signature = new LocalVariableSignature()
{
StartOffset = reader.Position,
Attributes = (CallingConventionAttributes)reader.ReadByte()
};
var count = reader.ReadCompressedUInt32();
for (int i = 0; i < count; i++)
signature.Variables.Add(VariableSignature.FromReader(header, reader));
return signature;
}
public new static LocalVariableSignature FromReader(MetadataImage image, IBinaryStreamReader reader)
{
var signature = new LocalVariableSignature
{
Attributes = (CallingConventionAttributes)reader.ReadByte()
};
var count = reader.ReadCompressedUInt32();
for (int i = 0; i < count; i++)
{
signature.Variables.Add(VariableSignature.FromReader(image, reader));
}
return(signature);
}
public static SecurityAttributeSignature FromReader(MetadataHeader header, IBinaryStreamReader reader)
{
var signature = new SecurityAttributeSignature()
{
StartOffset = reader.Position,
TypeName = reader.ReadSerString(),
};
reader.ReadCompressedUInt32();
uint argumentCount;
if (!reader.TryReadCompressedUInt32(out argumentCount))
return signature;
if (argumentCount == 0)
return signature;
for (int i = 0; i < argumentCount; i++)
signature.NamedArguments.Add(CustomAttributeNamedArgument.FromReader(header, reader));
return signature;
}
/// <summary>
/// Reads a single local variable signature at the current position of the provided stream reader.
/// </summary>
/// <param name="image">The image the signature was defined in.</param>
/// <param name="reader">The reader to use.</param>
/// <param name="readToEnd">Determines whether any extra data after the signature should be read and
/// put into the <see cref="ExtendableBlobSignature.ExtraData"/> property.</param>
/// <param name="protection">The recursion protection that is used to detect malicious loops in the metadata.</param>
/// <returns>The read signature.</returns>
public new static LocalVariableSignature FromReader(
MetadataImage image,
IBinaryStreamReader reader,
bool readToEnd, RecursionProtection protection)
{
var signature = new LocalVariableSignature
{
Attributes = (CallingConventionAttributes)reader.ReadByte()
};
uint count = reader.ReadCompressedUInt32();
for (int i = 0; i < count; i++)
{
signature.Variables.Add(VariableSignature.FromReader(image, reader, protection));
}
if (readToEnd)
{
signature.ExtraData = reader.ReadToEnd();
}
return(signature);
}
/// <summary>
/// Reads a type signature from a blob reader.
/// </summary>
/// <param name="module">The module containing the blob signature.</param>
/// <param name="reader">The blob signature reader.</param>
/// <param name="protection">The object responsible for detecting infinite recursion.</param>
/// <returns>The type signature.</returns>
/// <exception cref="ArgumentOutOfRangeException">Occurs when the blob reader points to an element type that is
/// invalid or unsupported.</exception>
public static TypeSignature FromReader(ModuleDefinition module, IBinaryStreamReader reader,
RecursionProtection protection)
{
var elementType = (ElementType)reader.ReadByte();
switch (elementType)
{
case ElementType.Void:
case ElementType.Boolean:
case ElementType.Char:
case ElementType.I1:
case ElementType.U1:
case ElementType.I2:
case ElementType.U2:
case ElementType.I4:
case ElementType.U4:
case ElementType.I8:
case ElementType.U8:
case ElementType.R4:
case ElementType.R8:
case ElementType.String:
case ElementType.I:
case ElementType.U:
case ElementType.TypedByRef:
case ElementType.Object:
return(module.CorLibTypeFactory.FromElementType(elementType));
case ElementType.ValueType:
return(new TypeDefOrRefSignature(ReadTypeDefOrRef(module, reader, protection, false), true));
case ElementType.Class:
return(new TypeDefOrRefSignature(ReadTypeDefOrRef(module, reader, protection, false), false));
case ElementType.Ptr:
return(new PointerTypeSignature(FromReader(module, reader, protection)));
case ElementType.ByRef:
return(new ByReferenceTypeSignature(FromReader(module, reader, protection)));
case ElementType.Var:
return(new GenericParameterSignature(module, GenericParameterType.Type,
(int)reader.ReadCompressedUInt32()));
case ElementType.MVar:
return(new GenericParameterSignature(module, GenericParameterType.Method,
(int)reader.ReadCompressedUInt32()));
case ElementType.Array:
return(ArrayTypeSignature.FromReader(module, reader, protection));
case ElementType.GenericInst:
return(GenericInstanceTypeSignature.FromReader(module, reader, protection));
case ElementType.FnPtr:
throw new NotImplementedException();
case ElementType.SzArray:
return(new SzArrayTypeSignature(FromReader(module, reader, protection)));
case ElementType.CModReqD:
return(new CustomModifierTypeSignature(
ReadTypeDefOrRef(module, reader, protection, true),
true,
FromReader(module, reader, protection)));
case ElementType.CModOpt:
return(new CustomModifierTypeSignature(
ReadTypeDefOrRef(module, reader, protection, true),
false,
FromReader(module, reader, protection)));
case ElementType.Sentinel:
return(new SentinelTypeSignature());
case ElementType.Pinned:
return(new PinnedTypeSignature(FromReader(module, reader, protection)));
case ElementType.Boxed:
return(new BoxedTypeSignature(FromReader(module, reader, protection)));
case ElementType.Internal:
IntPtr address = IntPtr.Size switch
{
4 => new IntPtr(reader.ReadInt32()),
_ => new IntPtr(reader.ReadInt64())
};
//Get Internal Method Through Reflection
var GetTypeFromHandleUnsafeReflection = typeof(Type)
.GetMethod("GetTypeFromHandleUnsafe", ((BindingFlags)(-1)), null, new[] { typeof(IntPtr) },
null);
//Invoke It To Get The Value
var Type = (Type)GetTypeFromHandleUnsafeReflection?.Invoke(null, new object[] { address });
//Import it
return(new TypeDefOrRefSignature(new ReferenceImporter(module).ImportType((Type))));
default:
throw new ArgumentOutOfRangeException($"Invalid or unsupported element type {elementType}.");
}
}
