C# ByteReader.ReadCompressedUInt方法代码示例

		internal static ByteReader FromBlob(byte[] blobHeap, int blob)
		{
			ByteReader br = new ByteReader(blobHeap, blob, 4);
			int length = br.ReadCompressedUInt();
			br.end = br.pos + length;
			return br;
		}

		private static string ReadString(ByteReader br)
		{
			return Encoding.UTF8.GetString(br.ReadBytes(br.ReadCompressedUInt()));
		}

		private static Type ReadGenericInst(ModuleReader module, ByteReader br, IGenericContext context)
		{
			Type type;
			switch (br.ReadByte())
			{
				case ELEMENT_TYPE_CLASS:
					type = ReadTypeDefOrRefEncoded(module, br, context).MarkNotValueType();
					break;
				case ELEMENT_TYPE_VALUETYPE:
					type = ReadTypeDefOrRefEncoded(module, br, context).MarkValueType();
					break;
				default:
					throw new BadImageFormatException();
			}
			if (!type.__IsMissing && !type.IsGenericTypeDefinition)
			{
				throw new BadImageFormatException();
			}
			int genArgCount = br.ReadCompressedUInt();
			Type[] args = new Type[genArgCount];
			CustomModifiers[] mods = null;
			for (int i = 0; i < genArgCount; i++)
			{
				// LAMESPEC the Type production (23.2.12) doesn't include CustomMod* for genericinst, but C++ uses it, the verifier allows it and ildasm also supports it
				CustomModifiers cm = CustomModifiers.Read(module, br, context);
				if (!cm.IsEmpty)
				{
					if (mods == null)
					{
						mods = new CustomModifiers[genArgCount];
					}
					mods[i] = cm;
				}
				args[i] = ReadType(module, br, context);
			}
			return GenericTypeInstance.Make(type, args, mods);
		}

		// this reads just the optional parameter types, from a MethodRefSig
		internal static Type[] ReadOptionalParameterTypes(ModuleReader module, ByteReader br, IGenericContext context, out CustomModifiers[] customModifiers)
		{
			br.ReadByte();
			int paramCount = br.ReadCompressedUInt();
			CustomModifiers.Skip(br);
			ReadRetType(module, br, context);
			for (int i = 0; i < paramCount; i++)
			{
				if (br.PeekByte() == SENTINEL)
				{
					br.ReadByte();
					Type[] types = new Type[paramCount - i];
					customModifiers = new CustomModifiers[types.Length];
					for (int j = 0; j < types.Length; j++)
					{
						customModifiers[j] = CustomModifiers.Read(module, br, context);
						types[j] = ReadType(module, br, context);
					}
					return types;
				}
				CustomModifiers.Skip(br);
				ReadType(module, br, context);
			}
			customModifiers = Empty<CustomModifiers>.Array;
			return Type.EmptyTypes;
		}

		internal static Type ReadTypeDefOrRefEncoded(ModuleReader module, ByteReader br, IGenericContext context)
		{
			int encoded = br.ReadCompressedUInt();
			switch (encoded & 3)
			{
				case 0:
					return module.ResolveType((TypeDefTable.Index << 24) + (encoded >> 2), null, null);
				case 1:
					return module.ResolveType((TypeRefTable.Index << 24) + (encoded >> 2), null, null);
				case 2:
					return module.ResolveType((TypeSpecTable.Index << 24) + (encoded >> 2), context);
				default:
					throw new BadImageFormatException();
			}
		}

		internal static void ReadLocalVarSig(ModuleReader module, ByteReader br, IGenericContext context, List<LocalVariableInfo> list)
		{
			if (br.Length < 2 || br.ReadByte() != LOCAL_SIG)
			{
				throw new BadImageFormatException("Invalid local variable signature");
			}
			int count = br.ReadCompressedUInt();
			for (int i = 0; i < count; i++)
			{
				if (br.PeekByte() == ELEMENT_TYPE_TYPEDBYREF)
				{
					br.ReadByte();
					list.Add(new LocalVariableInfo(i, module.universe.System_TypedReference, false, new CustomModifiers()));
				}
				else
				{
					CustomModifiers mods1 = CustomModifiers.Read(module, br, context);
					bool pinned = false;
					if (br.PeekByte() == ELEMENT_TYPE_PINNED)
					{
						br.ReadByte();
						pinned = true;
					}
					CustomModifiers mods2 = CustomModifiers.Read(module, br, context);
					Type type = ReadTypeOrByRef(module, br, context);
					list.Add(new LocalVariableInfo(i, type, pinned, CustomModifiers.Combine(mods1, mods2)));
				}
			}
		}

		// see ECMA 335 CLI spec June 2006 section 23.2.12 for this production
		protected static Type ReadType(ModuleReader module, ByteReader br, IGenericContext context)
		{
			CustomModifiers mods;
			switch (br.ReadByte())
			{
				case ELEMENT_TYPE_CLASS:
					return ReadTypeDefOrRefEncoded(module, br, context).MarkNotValueType();
				case ELEMENT_TYPE_VALUETYPE:
					return ReadTypeDefOrRefEncoded(module, br, context).MarkValueType();
				case ELEMENT_TYPE_BOOLEAN:
					return module.universe.System_Boolean;
				case ELEMENT_TYPE_CHAR:
					return module.universe.System_Char;
				case ELEMENT_TYPE_I1:
					return module.universe.System_SByte;
				case ELEMENT_TYPE_U1:
					return module.universe.System_Byte;
				case ELEMENT_TYPE_I2:
					return module.universe.System_Int16;
				case ELEMENT_TYPE_U2:
					return module.universe.System_UInt16;
				case ELEMENT_TYPE_I4:
					return module.universe.System_Int32;
				case ELEMENT_TYPE_U4:
					return module.universe.System_UInt32;
				case ELEMENT_TYPE_I8:
					return module.universe.System_Int64;
				case ELEMENT_TYPE_U8:
					return module.universe.System_UInt64;
				case ELEMENT_TYPE_R4:
					return module.universe.System_Single;
				case ELEMENT_TYPE_R8:
					return module.universe.System_Double;
				case ELEMENT_TYPE_I:
					return module.universe.System_IntPtr;
				case ELEMENT_TYPE_U:
					return module.universe.System_UIntPtr;
				case ELEMENT_TYPE_STRING:
					return module.universe.System_String;
				case ELEMENT_TYPE_OBJECT:
					return module.universe.System_Object;
				case ELEMENT_TYPE_VAR:
					return context.GetGenericTypeArgument(br.ReadCompressedUInt());
				case ELEMENT_TYPE_MVAR:
					return context.GetGenericMethodArgument(br.ReadCompressedUInt());
				case ELEMENT_TYPE_GENERICINST:
					return ReadGenericInst(module, br, context);
				case ELEMENT_TYPE_SZARRAY:
					mods = CustomModifiers.Read(module, br, context);
					return ReadType(module, br, context).__MakeArrayType(mods);
				case ELEMENT_TYPE_ARRAY:
					mods = CustomModifiers.Read(module, br, context);
					return ReadType(module, br, context).__MakeArrayType(br.ReadCompressedUInt(), ReadArraySizes(br), ReadArrayBounds(br), mods);
				case ELEMENT_TYPE_PTR:
					mods = CustomModifiers.Read(module, br, context);
					return ReadTypeOrVoid(module, br, context).__MakePointerType(mods);
				case ELEMENT_TYPE_FNPTR:
					return ReadFunctionPointer(module, br, context);
				default:
					throw new BadImageFormatException();
			}
		}

		private static int[] ReadArrayBounds(ByteReader br)
		{
			int num = br.ReadCompressedUInt();
			if (num == 0)
			{
				return null;
			}
			int[] arr = new int[num];
			for (int i = 0; i < num; i++)
			{
				arr[i] = br.ReadCompressedInt();
			}
			return arr;
		}

		internal static Type[] ReadMethodSpec(ModuleReader module, ByteReader br, IGenericContext context)
		{
			if (br.ReadByte() != GENERICINST)
			{
				throw new BadImageFormatException();
			}
			Type[] args = new Type[br.ReadCompressedUInt()];
			for (int i = 0; i < args.Length; i++)
			{
				CustomModifiers.Skip(br);
				args[i] = ReadType(module, br, context);
			}
			return args;
		}

		internal static MethodSignature ReadSig(ModuleReader module, ByteReader br, IGenericContext context)
		{
			CallingConventions callingConvention;
			int genericParamCount;
			Type returnType;
			Type[] parameterTypes;
			byte flags = br.ReadByte();
			switch (flags & 7)
			{
				case DEFAULT:
					callingConvention = CallingConventions.Standard;
					break;
				case VARARG:
					callingConvention = CallingConventions.VarArgs;
					break;
				default:
					throw new BadImageFormatException();
			}
			if ((flags & HASTHIS) != 0)
			{
				callingConvention |= CallingConventions.HasThis;
			}
			if ((flags & EXPLICITTHIS) != 0)
			{
				callingConvention |= CallingConventions.ExplicitThis;
			}
			genericParamCount = 0;
			if ((flags & GENERIC) != 0)
			{
				genericParamCount = br.ReadCompressedUInt();
				context = new UnboundGenericMethodContext(context);
			}
			int paramCount = br.ReadCompressedUInt();
			CustomModifiers[] modifiers = null;
			PackedCustomModifiers.Pack(ref modifiers, 0, CustomModifiers.Read(module, br, context), paramCount + 1);
			returnType = ReadRetType(module, br, context);
			parameterTypes = new Type[paramCount];
			for (int i = 0; i < parameterTypes.Length; i++)
			{
				if ((callingConvention & CallingConventions.VarArgs) != 0 && br.PeekByte() == SENTINEL)
				{
					Array.Resize(ref parameterTypes, i);
					if (modifiers != null)
					{
						Array.Resize(ref modifiers, i + 1);
					}
					break;
				}
				PackedCustomModifiers.Pack(ref modifiers, i + 1, CustomModifiers.Read(module, br, context), paramCount + 1);
				parameterTypes[i] = ReadParam(module, br, context);
			}
			return new MethodSignature(returnType, parameterTypes, PackedCustomModifiers.Wrap(modifiers), callingConvention, genericParamCount);
		}

		internal static __StandAloneMethodSig ReadStandAloneMethodSig(ModuleReader module, ByteReader br, IGenericContext context)
		{
			CallingConventions callingConvention = 0;
			System.Runtime.InteropServices.CallingConvention unmanagedCallingConvention = 0;
			bool unmanaged;
			byte flags = br.ReadByte();
			switch (flags & 7)
			{
				case DEFAULT:
					callingConvention = CallingConventions.Standard;
					unmanaged = false;
					break;
				case 0x01:	// C
					unmanagedCallingConvention = System.Runtime.InteropServices.CallingConvention.Cdecl;
					unmanaged = true;
					break;
				case 0x02:	// STDCALL
					unmanagedCallingConvention = System.Runtime.InteropServices.CallingConvention.StdCall;
					unmanaged = true;
					break;
				case 0x03:	// THISCALL
					unmanagedCallingConvention = System.Runtime.InteropServices.CallingConvention.ThisCall;
					unmanaged = true;
					break;
				case 0x04:	// FASTCALL
					unmanagedCallingConvention = System.Runtime.InteropServices.CallingConvention.FastCall;
					unmanaged = true;
					break;
				case VARARG:
					callingConvention = CallingConventions.VarArgs;
					unmanaged = false;
					break;
				default:
					throw new BadImageFormatException();
			}
			if ((flags & HASTHIS) != 0)
			{
				callingConvention |= CallingConventions.HasThis;
			}
			if ((flags & EXPLICITTHIS) != 0)
			{
				callingConvention |= CallingConventions.ExplicitThis;
			}
			if ((flags & GENERIC) != 0)
			{
				throw new BadImageFormatException();
			}
			int paramCount = br.ReadCompressedUInt();
			CustomModifiers[] customModifiers = null;
			PackedCustomModifiers.Pack(ref customModifiers, 0, CustomModifiers.Read(module, br, context), paramCount + 1);
			Type returnType = ReadRetType(module, br, context);
			List<Type> parameterTypes = new List<Type>();
			List<Type> optionalParameterTypes = new List<Type>();
			List<Type> curr = parameterTypes;
			for (int i = 0; i < paramCount; i++)
			{
				if (br.PeekByte() == SENTINEL)
				{
					br.ReadByte();
					curr = optionalParameterTypes;
				}
				PackedCustomModifiers.Pack(ref customModifiers, i + 1, CustomModifiers.Read(module, br, context), paramCount + 1);
				curr.Add(ReadParam(module, br, context));
			}
			return new __StandAloneMethodSig(unmanaged, unmanagedCallingConvention, callingConvention, returnType, parameterTypes.ToArray(), optionalParameterTypes.ToArray(), PackedCustomModifiers.Wrap(customModifiers));
		}

		internal static PropertySignature ReadSig(ModuleReader module, ByteReader br, IGenericContext context)
		{
			byte flags = br.ReadByte();
			if ((flags & PROPERTY) == 0)
			{
				throw new BadImageFormatException();
			}
			CallingConventions callingConvention = CallingConventions.Standard;
			if ((flags & HASTHIS) != 0)
			{
				callingConvention |= CallingConventions.HasThis;
			}
			if ((flags & EXPLICITTHIS) != 0)
			{
				callingConvention |= CallingConventions.ExplicitThis;
			}
			Type returnType;
			Type[] parameterTypes;
			int paramCount = br.ReadCompressedUInt();
			CustomModifiers[] mods = null;
			PackedCustomModifiers.Pack(ref mods, 0, CustomModifiers.Read(module, br, context), paramCount + 1);
			returnType = ReadRetType(module, br, context);
			parameterTypes = new Type[paramCount];
			for (int i = 0; i < parameterTypes.Length; i++)
			{
				PackedCustomModifiers.Pack(ref mods, i + 1, CustomModifiers.Read(module, br, context), paramCount + 1);
				parameterTypes[i] = ReadParam(module, br, context);
			}
			return new PropertySignature(callingConvention, returnType, parameterTypes, PackedCustomModifiers.Wrap(mods));
		}

		private static int ReadTypeSpec(ByteReader br)
		{
			if (br.ReadByte() != Signature.ELEMENT_TYPE_GENERICINST)
			{
				throw new NotImplementedException("Expected ELEMENT_TYPE_GENERICINST");
			}
			switch (br.ReadByte())
			{
				case Signature.ELEMENT_TYPE_CLASS:
				case Signature.ELEMENT_TYPE_VALUETYPE:
					break;
				default:
					throw new NotImplementedException("Expected ELEMENT_TYPE_CLASS or ELEMENT_TYPE_VALUETYPE");
			}
			int encoded = br.ReadCompressedUInt();
			switch (encoded & 3)
			{
				case 0:
					return (TypeDefTable.Index << 24) + (encoded >> 2);
				case 1:
					return (TypeRefTable.Index << 24) + (encoded >> 2);
				case 2:
					return (TypeSpecTable.Index << 24) + (encoded >> 2);
				default:
					throw new BadImageFormatException();
			}
		}