string ReadUTF8String() {
byte b = reader.ReadByte();
if (b == 0xFF)
return null;
uint len = reader.ReadCompressedUInt32(b);
if (len == 0)
return string.Empty;
return Encoding.UTF8.GetString(reader.ReadBytes((int)len));
}
// Reads the new (.NET 2.0+) DeclSecurity blob format
DmdCustomAttributeData[] ReadBinaryFormat(SecurityAction action)
{
int numAttrs = (int)reader.ReadCompressedUInt32();
DmdCustomAttributeData[]? res = new DmdCustomAttributeData[numAttrs];
IList <DmdType>?genericTypeArguments = null;
int w = 0;
for (int i = 0; i < numAttrs; i++)
{
var name = ReadUTF8String();
var type = DmdTypeNameParser.ParseThrow(module, name ?? string.Empty, genericTypeArguments);
reader.ReadCompressedUInt32(); // int blobLength
int numNamedArgs = (int)reader.ReadCompressedUInt32();
var namedArgs = DmdCustomAttributeReader.ReadNamedArguments(module, reader, type, numNamedArgs, genericTypeArguments);
if (namedArgs is null)
{
throw new IOException();
}
var(ctor, ctorArguments) = GetConstructor(type, action);
Debug.Assert(!(ctor is null));
if (ctor is null)
{
continue;
}
res[w++] = new DmdCustomAttributeData(ctor, ctorArguments, namedArgs, isPseudoCustomAttribute: false);
}
if (res.Length != w)
{
if (w == 0)
{
return(Array.Empty <DmdCustomAttributeData>());
}
Array.Resize(ref res, w);
}
return(res !);
}
string ReadUTF8String()
{
byte b = reader.ReadByte();
if (b == 0xFF)
{
return(null);
}
uint len = reader.ReadCompressedUInt32(b);
if (len == 0)
{
return(string.Empty);
}
return(Encoding.UTF8.GetString(reader.ReadBytes((int)len)));
}
DmdMarshalType Read()
{
const int DEFAULT = 0;
try {
var nativeType = (UnmanagedType)reader.ReadByte();
UnmanagedType nt;
int size;
switch (nativeType)
{
case UnmanagedType.ByValTStr:
size = CanRead ? (int)reader.ReadCompressedUInt32() : DEFAULT;
return(DmdMarshalType.CreateFixedSysString(size));
case UnmanagedType.SafeArray:
var vt = CanRead ? (VarEnum)reader.ReadCompressedUInt32() : DEFAULT;
var udtName = CanRead ? ReadUTF8String() : null;
var udtRef = udtName == null ? null : DmdTypeNameParser.Parse(module, udtName, genericTypeArguments);
return(DmdMarshalType.CreateSafeArray(vt, udtRef));
case UnmanagedType.ByValArray:
size = CanRead ? (int)reader.ReadCompressedUInt32() : DEFAULT;
nt = CanRead ? (UnmanagedType)reader.ReadCompressedUInt32() : DEFAULT;
return(DmdMarshalType.CreateFixedArray(size, nt));
case UnmanagedType.LPArray:
nt = CanRead ? (UnmanagedType)reader.ReadCompressedUInt32() : DEFAULT;
int paramNum = CanRead ? (int)reader.ReadCompressedUInt32() : DEFAULT;
size = CanRead ? (int)reader.ReadCompressedUInt32() : DEFAULT;
bool hasFlags = CanRead;
int flags = hasFlags ? (int)reader.ReadCompressedUInt32() : DEFAULT;
const int ntaSizeParamIndexSpecified = 1;
if (hasFlags && (flags & ntaSizeParamIndexSpecified) == 0)
{
paramNum = 0;
}
return(DmdMarshalType.CreateArray(nt, (short)paramNum, size));
case UnmanagedType.CustomMarshaler:
var guid = ReadUTF8String();
var nativeTypeName = ReadUTF8String();
var custMarshalerName = ReadUTF8String();
var cmRef = DmdTypeNameParser.Parse(module, custMarshalerName, genericTypeArguments);
var cookie = ReadUTF8String();
return(DmdMarshalType.CreateCustomMarshaler(custMarshalerName, cmRef, cookie));
case UnmanagedType.IUnknown:
case UnmanagedType.IDispatch:
case UnmanagedType.Interface:
int iidParamIndex = CanRead ? (int)reader.ReadCompressedUInt32() : DEFAULT;
return(DmdMarshalType.CreateInterface(nativeType, iidParamIndex));
default:
return(DmdMarshalType.Create(nativeType));
}
}
catch (ArgumentException) {
}
catch (IOException) {
}
return(null);
}
