/// <summary>
/// Factory method for creating new Signatures.
/// </summary>
/// <param name="source">The contents of the library the signiture is being read from</param>
/// <param name="offset">The offset to the start of the signiture</param>
/// <param name="tokenType">The type of signiture being read.</param>
/// <returns></returns>
public static Signature Create(byte[] source, Offset offset, Signatures tokenType)
{
int startingOffset = offset;
uint lengthOfSigniture = SignatureToken.GetCompressedValue(source, offset); // The first byte is always the length
// Read the full signiture
byte[] signiture = new byte[lengthOfSigniture];
for (int i = 0; i < lengthOfSigniture; i++)
{
signiture[i] = source[offset.Shift(1)];
}
// Instatiate the correct signiture reader and pass control
Signature instantiatedSigniture = null;
switch (tokenType)
{
case Signatures.CustomAttribute: // instantiatedSigniture = new CustomAttributeSigniture(signiture); break;
case Signatures.MethodSpecification: // to do: implement
break;
case Signatures.LocalVariable: instantiatedSigniture = new LocalVariableSignature(signiture); break;
case Signatures.MethodDef: instantiatedSigniture = new MethodDefSignature(signiture); break;
case Signatures.MethodRef: instantiatedSigniture = new MethodRefSignature(signiture); break;
case Signatures.Field: instantiatedSigniture = new FieldSignature(signiture); break;
case Signatures.Property: instantiatedSigniture = new PropertySignature(signiture); break;
case Signatures.TypeSpecification: instantiatedSigniture = new TypeSpecificationSignature(signiture); break;
}
return(instantiatedSigniture);
}
/// <summary>
/// Instantiates a new instance of the ElementTypeSignitureToken class.
/// </summary>
/// <include file='code-documentation\signatures.xml' path='docs/elementtypesignaturetoken/member[@name="ctor"]/*'/>
public ElementTypeSignatureToken(byte[] signiture, Offset offset)
: base(SignatureTokens.ElementType)
{
ElementType = (ElementTypes)GetCompressedValue(signiture, offset);
switch (ElementType)
{
case ElementTypes.Class:
case ElementTypes.ValueType:
DecodeEncodedDefRefSpecToken(signiture, offset);
break;
case ElementTypes.MVar:
case ElementTypes.Var:
Token = SignatureToken.GetCompressedValue(signiture, offset);
break;
// Well known types
case ElementTypes.Boolean: Definition = WellKnownTypeDef.Boolean; break;
case ElementTypes.I: Definition = WellKnownTypeDef.I; break;
case ElementTypes.I1: Definition = WellKnownTypeDef.I1; break;
case ElementTypes.I2: Definition = WellKnownTypeDef.I2; break;
case ElementTypes.I4: Definition = WellKnownTypeDef.I4; break;
case ElementTypes.I8: Definition = WellKnownTypeDef.I8; break;
case ElementTypes.U: Definition = WellKnownTypeDef.U; break;
case ElementTypes.U1: Definition = WellKnownTypeDef.U1; break;
case ElementTypes.U2: Definition = WellKnownTypeDef.U2; break;
case ElementTypes.U4: Definition = WellKnownTypeDef.U4; break;
case ElementTypes.U8: Definition = WellKnownTypeDef.U8; break;
case ElementTypes.Char: Definition = WellKnownTypeDef.Char; break;
case ElementTypes.R4: Definition = WellKnownTypeDef.R4; break;
case ElementTypes.R8: Definition = WellKnownTypeDef.R8; break;
case ElementTypes.TypedByRef: Definition = WellKnownTypeDef.TypedByRef; break;
case ElementTypes.String: Definition = WellKnownTypeDef.String; break;
case ElementTypes.Object: Definition = WellKnownTypeDef.Object; break;
case ElementTypes.Void: Definition = WellKnownTypeDef.Void; break;
}
}
/// <summary>
/// Instantiates a new instance of the ElementTypeSignitureToken class.
/// </summary>
/// <param name="signiture">The signiture where this token is defined.</param>
/// <param name="offset">The current offset in the signiture to read the token.</param>
/// <remarks>
/// <para>
/// An ElementTypeSignitureToken details the element of a Type signiture. These
/// elements are defined in section 23.1.16 in ECMA 335. Where a type can contain
/// multiple ElementTypeSignitureTokens each building up to reveal more information
/// about the type. This class will only ever provide a single item of detail.
/// </para>
/// </remarks>
public ElementTypeSignatureToken(byte[] signiture, Offset offset)
: base(SignatureTokens.ElementType)
{
ElementType = (ElementTypes)GetCompressedValue(signiture, offset);
int typeMask;
uint token;
switch (ElementType)
{
case ElementTypes.Class:
// Read the typedef, typeref or typespec token
typeMask = 0x00000003;
token = GetCompressedValue(signiture, offset);
switch (typeMask & token)
{
case 0: // TypeDef
Token = token >> 2 | (int)ILMetadataToken.TypeDef; // (token & typeMask) | token >> 2;
break;
case 1: // TypeRef
Token = token >> 2 | (int)ILMetadataToken.TypeRef; //(token & typeMask) | token >> 2;
break;
case 2: // TypeSpec
Token = token >> 2 | (int)ILMetadataToken.TypeSpec; // (token & typeMask) | token >> 2;
break;
}
break;
case ElementTypes.ValueType:
// Read the typedef, typeref or typespec token
typeMask = 0x00000003;
token = GetCompressedValue(signiture, offset);
switch (typeMask & token)
{
case 0: // TypeDef
Token = token >> 2 | (int)ILMetadataToken.TypeDef; // (token & typeMask) | token >> 2;
break;
case 1: // TypeRef
Token = token >> 2 | (int)ILMetadataToken.TypeRef; //(token & typeMask) | token >> 2;
break;
}
break;
case ElementTypes.MVar:
case ElementTypes.Var:
Token = SignatureToken.GetCompressedValue(signiture, offset);
break;
// Well known types
case ElementTypes.Boolean: Definition = WellKnownTypeDef.Boolean; break;
case ElementTypes.I: Definition = WellKnownTypeDef.I; break;
case ElementTypes.I1: Definition = WellKnownTypeDef.I1; break;
case ElementTypes.I2: Definition = WellKnownTypeDef.I2; break;
case ElementTypes.I4: Definition = WellKnownTypeDef.I4; break;
case ElementTypes.I8: Definition = WellKnownTypeDef.I8; break;
case ElementTypes.U: Definition = WellKnownTypeDef.U; break;
case ElementTypes.U1: Definition = WellKnownTypeDef.U1; break;
case ElementTypes.U2: Definition = WellKnownTypeDef.U2; break;
case ElementTypes.U4: Definition = WellKnownTypeDef.U4; break;
case ElementTypes.U8: Definition = WellKnownTypeDef.U8; break;
case ElementTypes.Char: Definition = WellKnownTypeDef.Char; break;
case ElementTypes.R4: Definition = WellKnownTypeDef.R4; break;
case ElementTypes.R8: Definition = WellKnownTypeDef.R8; break;
case ElementTypes.TypedByRef: Definition = WellKnownTypeDef.TypedByRef; break;
case ElementTypes.String: Definition = WellKnownTypeDef.String; break;
case ElementTypes.Object: Definition = WellKnownTypeDef.Object; break;
case ElementTypes.Void: Definition = WellKnownTypeDef.Void; break;
}
}
