private static object ReadRawOperand(IBinaryStreamReader reader, MsilOperandType msilOperandType)
{
switch (msilOperandType)
{
case MsilOperandType.InlineNone:
return(null);
case MsilOperandType.InlineArgument:
case MsilOperandType.InlineVar:
return(reader.ReadInt16());
case MsilOperandType.InlineI:
case MsilOperandType.InlineBrTarget:
return(reader.ReadInt32());
case MsilOperandType.ShortInlineArgument:
case MsilOperandType.ShortInlineVar:
case MsilOperandType.ShortInlineBrTarget:
case MsilOperandType.ShortInlineI:
return(reader.ReadSByte());
case MsilOperandType.ShortInlineR:
return(reader.ReadSingle());
case MsilOperandType.InlineR:
return(reader.ReadDouble());
case MsilOperandType.InlineI8:
return(reader.ReadInt64());
case MsilOperandType.InlineField:
case MsilOperandType.InlineMethod:
case MsilOperandType.InlineSig:
case MsilOperandType.InlineTok:
case MsilOperandType.InlineType:
case MsilOperandType.InlineString:
return(new MetadataToken(reader.ReadUInt32()));
case MsilOperandType.InlineSwitch:
var offsets = new int[reader.ReadUInt32()];
for (int i = 0; i < offsets.Length; i++)
{
offsets[i] = reader.ReadInt32();
}
return(offsets);
}
throw new NotSupportedException();
}
/// <summary>
/// Reads a metadata directory from an input stream.
/// </summary>
/// <param name="context">The reader context.</param>
/// <param name="directoryReader">The input stream containing the metadata directory.</param>
/// <exception cref="ArgumentNullException">Occurs when any of the arguments are <c>null</c>.</exception>
/// <exception cref="NotSupportedException">Occurs when an unsupported metadata directory format was encountered.</exception>
/// <exception cref="BadImageFormatException">Occurs when the metadata directory header is invalid.</exception>
public SerializedMetadata(PEReaderContext context, IBinaryStreamReader directoryReader)
{
if (directoryReader == null)
{
throw new ArgumentNullException(nameof(directoryReader));
}
_context = context ?? throw new ArgumentNullException(nameof(context));
_streamContentsReader = directoryReader.Fork();
var signature = (MetadataSignature)directoryReader.ReadUInt32();
switch (signature)
{
case MetadataSignature.Bsjb:
// BSJB header is the default header.
break;
case MetadataSignature.Moc:
_context.NotSupported("Old +MOC metadata header format is not supported.");
return;
default:
_context.BadImage($"Invalid metadata header ({(uint) signature:X8}).");
return;
}
MajorVersion = directoryReader.ReadUInt16();
MinorVersion = directoryReader.ReadUInt16();
Reserved = directoryReader.ReadUInt32();
int versionLength = directoryReader.ReadInt32();
if (!directoryReader.CanRead(versionLength))
{
_context.BadImage($"Invalid version length in metadata header ({versionLength.ToString()} characters).");
return;
}
var versionBytes = new byte[versionLength];
directoryReader.ReadBytes(versionBytes, 0, versionBytes.Length);
VersionString = Encoding.ASCII.GetString(versionBytes);
Flags = directoryReader.ReadUInt16();
_numberOfStreams = directoryReader.ReadInt16();
_streamEntriesReader = directoryReader.Fork();
}
/// <summary>
/// Reads a metadata directory from an input stream.
/// </summary>
/// <param name="reader">The input stream.</param>
/// <param name="metadataStreamReader"></param>
/// <exception cref="ArgumentNullException">Occurs when any of the arguments are <c>null</c>.</exception>
/// <exception cref="NotSupportedException">Occurs when an unsupported metadata directory format was encountered.</exception>
/// <exception cref="BadImageFormatException">Occurs when the metadata directory header is invalid.</exception>
public SerializedMetadata(IBinaryStreamReader reader, IMetadataStreamReader metadataStreamReader)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
_metadataStreamReader = metadataStreamReader;
_streamContentsReader = reader.Fork();
var signature = (MetadataSignature)reader.ReadUInt32();
switch (signature)
{
case MetadataSignature.Bsjb:
// BSJB header is the default header.
break;
case MetadataSignature.Moc:
throw new NotSupportedException("Old +MOC metadata header format is not supported.");
default:
throw new BadImageFormatException($"Invalid metadata header ({(uint) signature:X8}).");
}
MajorVersion = reader.ReadUInt16();
MinorVersion = reader.ReadUInt16();
Reserved = reader.ReadUInt32();
int versionLength = reader.ReadInt32();
if (!reader.CanRead(versionLength))
{
throw new BadImageFormatException($"Invalid version length in metadata header ({versionLength} characters).");
}
var versionBytes = new byte[versionLength];
reader.ReadBytes(versionBytes, 0, versionBytes.Length);
VersionString = Encoding.ASCII.GetString(versionBytes);
Flags = reader.ReadUInt16();
_numberOfStreams = reader.ReadInt16();
_streamEntriesReader = reader.Fork();
}
private object ReadSignedImmediateData(X86OperandSize size)
{
switch (size)
{
case X86OperandSize.Byte:
return(_reader.ReadSByte());
case X86OperandSize.Word:
return(_reader.ReadInt16());
case X86OperandSize.Dword:
return(_reader.ReadInt32());
case X86OperandSize.WordOrDword:
return(_reader.ReadInt32()); // TODO: use operand-size override opcode
// TODO: fword
}
throw new NotSupportedException();
}
private static object ReadElement(IBinaryStreamReader reader, ElementType elementType)
{
switch (elementType)
{
case ElementType.I1:
return(reader.ReadSByte());
case ElementType.I2:
return(reader.ReadInt16());
case ElementType.I4:
return(reader.ReadInt32());
case ElementType.I8:
return(reader.ReadInt64());
case ElementType.U1:
return(reader.ReadByte());
case ElementType.U2:
return(reader.ReadUInt16());
case ElementType.U4:
return(reader.ReadUInt32());
case ElementType.U8:
return(reader.ReadUInt64());
case ElementType.R4:
return(reader.ReadSingle());
case ElementType.R8:
return(reader.ReadDouble());
}
ThrowUnsupportedElementType(elementType);
return(null);
}
private static object ReadValue(MetadataHeader header, TypeSignature typeSignature, IBinaryStreamReader reader)
{
switch (typeSignature.ElementType)
{
case ElementType.Boolean:
return(reader.ReadByte() == 1);
case ElementType.Char:
return((char)reader.ReadUInt16());
case ElementType.R4:
return(reader.ReadSingle());
case ElementType.R8:
return(reader.ReadDouble());
case ElementType.I1:
return(reader.ReadSByte());
case ElementType.I2:
return(reader.ReadInt16());
case ElementType.I4:
return(reader.ReadInt32());
case ElementType.I8:
return(reader.ReadInt64());
case ElementType.U1:
return(reader.ReadByte());
case ElementType.U2:
return(reader.ReadUInt16());
case ElementType.U4:
return(reader.ReadUInt32());
case ElementType.U8:
return(reader.ReadUInt64());
case ElementType.String:
return(reader.ReadSerString());
case ElementType.Object:
case ElementType.Class:
case ElementType.Enum:
case ElementType.ValueType:
var enumTypeDef = header.MetadataResolver.ResolveType(typeSignature);
if (enumTypeDef == null)
{
throw new MemberResolutionException(typeSignature);
}
if (enumTypeDef.IsEnum)
{
return(ReadValue(header, enumTypeDef.GetEnumUnderlyingType(), reader));
}
break;
}
if (typeSignature.IsTypeOf("System", "Type"))
{
return(reader.ReadSerString());
}
throw new NotSupportedException("Unsupported element type " + typeSignature.ElementType);
}
private static object ReadValue(ModuleDefinition parentModule, TypeSignature valueType, IBinaryStreamReader reader)
{
switch (valueType.ElementType)
{
case ElementType.Boolean:
return(reader.ReadByte() == 1);
case ElementType.Char:
return((char)reader.ReadUInt16());
case ElementType.R4:
return(reader.ReadSingle());
case ElementType.R8:
return(reader.ReadDouble());
case ElementType.I1:
return(reader.ReadSByte());
case ElementType.I2:
return(reader.ReadInt16());
case ElementType.I4:
return(reader.ReadInt32());
case ElementType.I8:
return(reader.ReadInt64());
case ElementType.U1:
return(reader.ReadByte());
case ElementType.U2:
return(reader.ReadUInt16());
case ElementType.U4:
return(reader.ReadUInt32());
case ElementType.U8:
return(reader.ReadUInt64());
case ElementType.String:
return(reader.ReadSerString());
case ElementType.Object:
return(ReadValue(parentModule, TypeSignature.ReadFieldOrPropType(parentModule, reader), reader));
case ElementType.Class:
case ElementType.Enum:
case ElementType.ValueType:
var enumTypeDef = parentModule.MetadataResolver.ResolveType(valueType);
if (enumTypeDef != null && enumTypeDef.IsEnum)
{
return(ReadValue(parentModule, enumTypeDef.GetEnumUnderlyingType(), reader));
}
break;
}
if (valueType.IsTypeOf("System", "Type"))
{
return(TypeNameParser.Parse(parentModule, reader.ReadSerString()));
}
throw new NotSupportedException($"Unsupported element type {valueType.ElementType}.");
}
private static object ReadValue(MetadataHeader header, TypeSignature typeSignature, IBinaryStreamReader reader)
{
switch (typeSignature.ElementType)
{
case ElementType.Boolean:
return reader.ReadByte() == 1;
case ElementType.Char:
return (char)reader.ReadUInt16();
case ElementType.R4:
return reader.ReadSingle();
case ElementType.R8:
return reader.ReadDouble();
case ElementType.I1:
return reader.ReadSByte();
case ElementType.I2:
return reader.ReadInt16();
case ElementType.I4:
return reader.ReadInt32();
case ElementType.I8:
return reader.ReadInt64();
case ElementType.U1:
return reader.ReadByte();
case ElementType.U2:
return reader.ReadUInt16();
case ElementType.U4:
return reader.ReadUInt32();
case ElementType.U8:
return reader.ReadUInt64();
case ElementType.String:
return reader.ReadSerString();
case ElementType.Object:
return ReadValue(header, TypeSignature.ReadFieldOrPropType(header, reader), reader);
case ElementType.Class:
case ElementType.Enum:
case ElementType.ValueType:
var enumTypeDef = header.MetadataResolver.ResolveType(typeSignature);
if (enumTypeDef == null)
throw new MemberResolutionException(typeSignature);
if (enumTypeDef.IsEnum)
return ReadValue(header, enumTypeDef.GetEnumUnderlyingType(), reader);
break;
}
if (typeSignature.IsTypeOf("System", "Type"))
return TypeSignature.FromAssemblyQualifiedName(header, reader.ReadSerString());
throw new NotSupportedException("Unsupported element type " + typeSignature.ElementType);
}
public void ReadValue(TypeSignature valueType)
{
if (valueType.IsTypeOf("System", "Type"))
{
Elements.Add(TypeNameParser.Parse(_parentModule, _reader.ReadSerString()));
return;
}
switch (valueType.ElementType)
{
case ElementType.Boolean:
Elements.Add(_reader.ReadByte() == 1);
break;
case ElementType.Char:
Elements.Add((char)_reader.ReadUInt16());
break;
case ElementType.R4:
Elements.Add(_reader.ReadSingle());
break;
case ElementType.R8:
Elements.Add(_reader.ReadDouble());
break;
case ElementType.I1:
Elements.Add(_reader.ReadSByte());
break;
case ElementType.I2:
Elements.Add(_reader.ReadInt16());
break;
case ElementType.I4:
Elements.Add(_reader.ReadInt32());
break;
case ElementType.I8:
Elements.Add(_reader.ReadInt64());
break;
case ElementType.U1:
Elements.Add(_reader.ReadByte());
break;
case ElementType.U2:
Elements.Add(_reader.ReadUInt16());
break;
case ElementType.U4:
Elements.Add(_reader.ReadUInt32());
break;
case ElementType.U8:
Elements.Add(_reader.ReadUInt64());
break;
case ElementType.String:
Elements.Add(_reader.ReadSerString());
break;
case ElementType.Object:
var reader = new CustomAttributeArgumentReader(_parentModule, _reader);
var type = TypeSignature.ReadFieldOrPropType(_parentModule, _reader);
reader.ReadValue(type);
Elements.Add(new BoxedArgument(type, type.ElementType == ElementType.SzArray
? reader.Elements.ToArray()
: reader.Elements[0]));
break;
case ElementType.SzArray:
var arrayElementType = ((SzArrayTypeSignature)valueType).BaseType;
uint elementCount = _reader.CanRead(sizeof(uint)) ? _reader.ReadUInt32() : uint.MaxValue;
IsNullArray = elementCount == uint.MaxValue;
if (!IsNullArray)
{
for (uint i = 0; i < elementCount; i++)
{
ReadValue(arrayElementType);
}
}
break;
case ElementType.Class:
case ElementType.Enum:
case ElementType.ValueType:
// Value is an enum, resolve it and get underlying type.
// If that fails, most enums are int32s, assume that is the case in an attempt to recover.
var enumTypeDef = _parentModule.MetadataResolver.ResolveType(valueType);
TypeSignature underlyingType;
if (enumTypeDef is null)
{
underlyingType = _parentModule.CorLibTypeFactory.Int32;
}
else if (enumTypeDef.IsEnum)
{
underlyingType = enumTypeDef.GetEnumUnderlyingType() ?? _parentModule.CorLibTypeFactory.Int32;
}
else
{
throw new NotSupportedException($"Type {valueType} is not an enum.");
}
ReadValue(underlyingType);
break;
default:
throw new NotSupportedException($"Unsupported element type {valueType.ElementType}.");
}
}
