private static FieldDef GetOrCreateDataField(ModuleDef module, byte[] data)
{
var privateImplementationDetails = module.FindNormal("<PrivateImplementationDetails>");
if (privateImplementationDetails is null)
{
privateImplementationDetails = new TypeDefUser(UTF8String.Empty, "<PrivateImplementationDetails>", module.CorLibTypes.Object.TypeRef)
{
Attributes = TypeAttributes.NotPublic | TypeAttributes.Sealed
};
var compilerGeneratedAttribute = module.CorLibTypes.GetTypeRef("System.Runtime.CompilerServices", "CompilerGeneratedAttribute");
var ca = new CustomAttribute(new MemberRefUser(module, ".ctor", MethodSig.CreateInstance(module.CorLibTypes.Void), compilerGeneratedAttribute));
privateImplementationDetails.CustomAttributes.Add(ca);
module.Types.Add(privateImplementationDetails);
}
string storageStructName = $"__StaticArrayInitTypeSize={data.Length}";
var storageStruct = privateImplementationDetails.NestedTypes.FirstOrDefault(t => t.Name == storageStructName);
if (storageStruct is null)
{
storageStruct = new TypeDefUser(string.Empty, storageStructName, module.CorLibTypes.GetTypeRef("System", "ValueType"))
{
Attributes = TypeAttributes.NestedPrivate | TypeAttributes.ExplicitLayout | TypeAttributes.Sealed,
ClassLayout = new ClassLayoutUser(1, (uint)data.Length)
};
privateImplementationDetails.NestedTypes.Add(storageStruct);
}
string dataFieldName;
using (var sha256 = SHA256.Create())
dataFieldName = BitConverter.ToString(sha256.ComputeHash(data)).Replace("-", string.Empty);
var dataField = privateImplementationDetails.FindField(dataFieldName);
if (!(dataField is null))
{
return(dataField);
}
dataField = new FieldDefUser(dataFieldName, new FieldSig(storageStruct.ToTypeSig()))
{
Attributes = FieldAttributes.Assembly | FieldAttributes.Static | FieldAttributes.InitOnly | FieldAttributes.HasFieldRVA,
InitialValue = data
};
privateImplementationDetails.Fields.Add(dataField);
return(dataField);
}