C# BigEndianBinaryReader.ReadByte方法代碼示例

 internal void read(BigEndianBinaryReader reader)
 {
     width = reader.ReadInt32();
     height = reader.ReadInt32();
     bitdepth = reader.ReadByte();
     colortype = (ColorType)reader.ReadByte();
     method = reader.ReadByte();
     filter = reader.ReadByte();
     interlace = reader.ReadByte();
 }

		// This method parses just enough of the class file to obtain its name, it doesn't
		// validate the class file structure, but it may throw a ClassFormatError if it
		// encounters bogus data
		internal static string GetClassName(byte[] buf, int offset, int length)
		{
			BigEndianBinaryReader br = new BigEndianBinaryReader(buf, offset, length);
			if(br.ReadUInt32() != 0xCAFEBABE)
			{
				throw new ClassFormatError("Bad magic number");
			}
			int minorVersion = br.ReadUInt16();
			int majorVersion = br.ReadUInt16();
			if((majorVersion & FLAG_MASK_MAJORVERSION) != majorVersion
				|| majorVersion < SupportedVersions.Minimum
				|| majorVersion > SupportedVersions.Maximum
				|| (majorVersion == SupportedVersions.Minimum && minorVersion < 3)
				|| (majorVersion == SupportedVersions.Maximum && minorVersion != 0))
			{
				throw new UnsupportedClassVersionError(majorVersion + "." + minorVersion);
			}
			int constantpoolcount = br.ReadUInt16();
			int[] cpclass = new int[constantpoolcount];
			string[] utf8_cp = new string[constantpoolcount];
			for(int i = 1; i < constantpoolcount; i++)
			{
				Constant tag = (Constant)br.ReadByte();
				switch(tag)
				{
					case Constant.Class:
						cpclass[i] = br.ReadUInt16();
						break;
					case Constant.Double:
					case Constant.Long:
						br.Skip(8);
						i++;
						break;
					case Constant.Fieldref:
					case Constant.InterfaceMethodref:
					case Constant.Methodref:
					case Constant.InvokeDynamic:
					case Constant.NameAndType:
					case Constant.Float:
					case Constant.Integer:
						br.Skip(4);
						break;
					case Constant.MethodHandle:
						br.Skip(3);
						break;
					case Constant.String:
					case Constant.MethodType:
						br.Skip(2);
						break;
					case Constant.Utf8:
						utf8_cp[i] = br.ReadString("<unknown>");
						break;
					default:
						throw new ClassFormatError("Illegal constant pool type 0x{0:X}", tag);
				}
			}
			br.ReadUInt16(); // access_flags
			try
			{
				return String.Intern(utf8_cp[cpclass[br.ReadUInt16()]].Replace('/', '.'));
			}
			catch(Exception x)
			{
				throw new ClassFormatError("{0}: {1}", x.GetType().Name, x.Message);
			}
		}

		private static object ReadAnnotationElementValue(BigEndianBinaryReader rdr, ClassFile classFile, string[] utf8_cp)
		{
			try
			{
				byte tag = rdr.ReadByte();
				switch (tag)
				{
					case (byte)'Z':
						return classFile.GetConstantPoolConstantInteger(rdr.ReadUInt16()) != 0;
					case (byte)'B':
						return (byte)classFile.GetConstantPoolConstantInteger(rdr.ReadUInt16());
					case (byte)'C':
						return (char)classFile.GetConstantPoolConstantInteger(rdr.ReadUInt16());
					case (byte)'S':
						return (short)classFile.GetConstantPoolConstantInteger(rdr.ReadUInt16());
					case (byte)'I':
						return classFile.GetConstantPoolConstantInteger(rdr.ReadUInt16());
					case (byte)'F':
						return classFile.GetConstantPoolConstantFloat(rdr.ReadUInt16());
					case (byte)'J':
						return classFile.GetConstantPoolConstantLong(rdr.ReadUInt16());
					case (byte)'D':
						return classFile.GetConstantPoolConstantDouble(rdr.ReadUInt16());
					case (byte)'s':
						return classFile.GetConstantPoolUtf8String(utf8_cp, rdr.ReadUInt16());
					case (byte)'e':
						{
							ushort type_name_index = rdr.ReadUInt16();
							ushort const_name_index = rdr.ReadUInt16();
							return new object[] {
											AnnotationDefaultAttribute.TAG_ENUM,
											classFile.GetConstantPoolUtf8String(utf8_cp, type_name_index),
											classFile.GetConstantPoolUtf8String(utf8_cp, const_name_index)
										};
						}
					case (byte)'c':
						return new object[] {
											AnnotationDefaultAttribute.TAG_CLASS,
											classFile.GetConstantPoolUtf8String(utf8_cp, rdr.ReadUInt16())
										};
					case (byte)'@':
						return ReadAnnotation(rdr, classFile, utf8_cp);
					case (byte)'[':
						{
							ushort num_values = rdr.ReadUInt16();
							object[] array = new object[num_values + 1];
							array[0] = AnnotationDefaultAttribute.TAG_ARRAY;
							for (int i = 0; i < num_values; i++)
							{
								array[i + 1] = ReadAnnotationElementValue(rdr, classFile, utf8_cp);
							}
							return array;
						}
					default:
						throw new ClassFormatError("Invalid tag {0} in annotation element_value", tag);
				}
			}
			catch (NullReferenceException)
			{
			}
			catch (InvalidCastException)
			{
			}
			catch (IndexOutOfRangeException)
			{
			}
			return new object[] { AnnotationDefaultAttribute.TAG_ERROR, "java.lang.IllegalArgumentException", "Wrong type at constant pool index" };
		}

				internal void Read(ushort pc, BigEndianBinaryReader br, ClassFile classFile)
				{
					this.pc = pc;
					ByteCode bc = (ByteCode)br.ReadByte();
					switch(ByteCodeMetaData.GetMode(bc))
					{
						case ByteCodeMode.Simple:
							break;
						case ByteCodeMode.Constant_1:
							arg1 = br.ReadByte();
							classFile.MarkLinkRequiredConstantPoolItem(arg1);
							break;
						case ByteCodeMode.Local_1:
							arg1 = br.ReadByte();
							break;
						case ByteCodeMode.Constant_2:
							arg1 = br.ReadUInt16();
							classFile.MarkLinkRequiredConstantPoolItem(arg1);
							break;
						case ByteCodeMode.Branch_2:
							arg1 = br.ReadInt16();
							break;
						case ByteCodeMode.Branch_4:
							arg1 = br.ReadInt32();
							break;
						case ByteCodeMode.Constant_2_1_1:
							arg1 = br.ReadUInt16();
							classFile.MarkLinkRequiredConstantPoolItem(arg1);
							arg2 = br.ReadByte();
							if(br.ReadByte() != 0)
							{
								throw new ClassFormatError("invokeinterface filler must be zero");
							}
							break;
						case ByteCodeMode.Immediate_1:
							arg1 = br.ReadSByte();
							break;
						case ByteCodeMode.Immediate_2:
							arg1 = br.ReadInt16();
							break;
						case ByteCodeMode.Local_1_Immediate_1:
							arg1 = br.ReadByte();
							arg2 = br.ReadSByte();
							break;
						case ByteCodeMode.Constant_2_Immediate_1:
							arg1 = br.ReadUInt16();
							classFile.MarkLinkRequiredConstantPoolItem(arg1);
							arg2 = br.ReadSByte();
							break;
						case ByteCodeMode.Tableswitch:
						{
							// skip the padding
							uint p = pc + 1u;
							uint align = ((p + 3) & 0x7ffffffc) - p;
							br.Skip(align);
							int default_offset = br.ReadInt32();
							this.arg1 = default_offset;
							int low = br.ReadInt32();
							int high = br.ReadInt32();
							if(low > high || high > 16384L + low)
							{
								throw new ClassFormatError("Incorrect tableswitch");
							}
							SwitchEntry[] entries = new SwitchEntry[high - low + 1];
							for(int i = low; i < high; i++)
							{
								entries[i - low].value = i;
								entries[i - low].target = br.ReadInt32();
							}
							// do the last entry outside the loop, to avoid overflowing "i", if high == int.MaxValue
							entries[high - low].value = high;
							entries[high - low].target = br.ReadInt32();
							this.switch_entries = entries;
							break;
						}
						case ByteCodeMode.Lookupswitch:
						{
							// skip the padding
							uint p = pc + 1u;
							uint align = ((p + 3) & 0x7ffffffc) - p;
							br.Skip(align);
							int default_offset = br.ReadInt32();
							this.arg1 = default_offset;
							int count = br.ReadInt32();
							if(count < 0 || count > 16384)
							{
								throw new ClassFormatError("Incorrect lookupswitch");
							}
							SwitchEntry[] entries = new SwitchEntry[count];
							for(int i = 0; i < count; i++)
							{
								entries[i].value = br.ReadInt32();
								entries[i].target = br.ReadInt32();
							}
							this.switch_entries = entries;
							break;
						}
						case ByteCodeMode.WidePrefix:
							bc = (ByteCode)br.ReadByte();
							// NOTE the PC of a wide instruction is actually the PC of the
//.........這裏部分代碼省略.........

			internal ConstantPoolItemMethodHandle(BigEndianBinaryReader br)
			{
				ref_kind = br.ReadByte();
				method_index = br.ReadUInt16();
			}

		internal ClassFile(byte[] buf, int offset, int length, string inputClassName, ClassFileParseOptions options)
		{
			try
			{
				BigEndianBinaryReader br = new BigEndianBinaryReader(buf, offset, length);
				if(br.ReadUInt32() != 0xCAFEBABE)
				{
					throw new ClassFormatError("{0} (Bad magic number)", inputClassName);
				}
				ushort minorVersion = br.ReadUInt16();
				ushort majorVersion = br.ReadUInt16();
				if((majorVersion & FLAG_MASK_MAJORVERSION) != majorVersion
					|| majorVersion < SupportedVersions.Minimum
					|| majorVersion > SupportedVersions.Maximum
					|| (majorVersion == SupportedVersions.Minimum && minorVersion < 3)
					|| (majorVersion == SupportedVersions.Maximum && minorVersion != 0))
				{
					throw new UnsupportedClassVersionError(inputClassName + " (" + majorVersion + "." + minorVersion + ")");
				}
				flags = majorVersion;
				int constantpoolcount = br.ReadUInt16();
				constantpool = new ConstantPoolItem[constantpoolcount];
				string[] utf8_cp = new string[constantpoolcount];
				for(int i = 1; i < constantpoolcount; i++)
				{
					Constant tag = (Constant)br.ReadByte();
					switch(tag)
					{
						case Constant.Class:
							constantpool[i] = new ConstantPoolItemClass(br);
							break;
						case Constant.Double:
							constantpool[i] = new ConstantPoolItemDouble(br);
							i++;
							break;
						case Constant.Fieldref:
							constantpool[i] = new ConstantPoolItemFieldref(br);
							break;
						case Constant.Float:
							constantpool[i] = new ConstantPoolItemFloat(br);
							break;
						case Constant.Integer:
							constantpool[i] = new ConstantPoolItemInteger(br);
							break;
						case Constant.InterfaceMethodref:
							constantpool[i] = new ConstantPoolItemInterfaceMethodref(br);
							break;
						case Constant.Long:
							constantpool[i] = new ConstantPoolItemLong(br);
							i++;
							break;
						case Constant.Methodref:
							constantpool[i] = new ConstantPoolItemMethodref(br);
							break;
						case Constant.NameAndType:
							constantpool[i] = new ConstantPoolItemNameAndType(br);
							break;
						case Constant.MethodHandle:
							if (majorVersion < 51)
								goto default;
							constantpool[i] = new ConstantPoolItemMethodHandle(br);
							break;
						case Constant.MethodType:
							if (majorVersion < 51)
								goto default;
							constantpool[i] = new ConstantPoolItemMethodType(br);
							break;
						case Constant.InvokeDynamic:
							if (majorVersion < 51)
								goto default;
							constantpool[i] = new ConstantPoolItemInvokeDynamic(br);
							break;
						case Constant.String:
							constantpool[i] = new ConstantPoolItemString(br);
							break;
						case Constant.Utf8:
							utf8_cp[i] = br.ReadString(inputClassName);
							break;
						default:
							throw new ClassFormatError("{0} (Illegal constant pool type 0x{1:X})", inputClassName, tag);
					}
				}
				for(int i = 1; i < constantpoolcount; i++)
				{
					if(constantpool[i] != null)
					{
						try
						{
							constantpool[i].Resolve(this, utf8_cp, options);
						}
						catch(ClassFormatError x)
						{
							// HACK at this point we don't yet have the class name, so any exceptions throw
							// are missing the class name
							throw new ClassFormatError("{0} ({1})", inputClassName, x.Message);
						}
						catch(IndexOutOfRangeException)
						{
							throw new ClassFormatError("{0} (Invalid constant pool item #{1})", inputClassName, i);
						}
//.........這裏部分代碼省略.........

        /// <summary>
        /// Decode messages from a payload and assign it a given kafka offset.
        /// </summary>
        /// <param name="offset">The offset represting the log entry from kafka of this message.</param>
        /// <param name="payload">The byte[] encode as a message from kafka.</param>
        /// <returns>Enumerable representing stream of messages decoded from byte[].</returns>
        /// <remarks>The return type is an Enumerable as the message could be a compressed message set.</remarks>
        public static IEnumerable<Message> DecodeMessage(long offset, byte[] payload)
        {
            var crc = payload.Take(4).ToArray();
            using (var stream = new BigEndianBinaryReader(payload.Skip(4)))
            {
                if (crc.SequenceEqual(stream.CrcHash()) == false)
                    throw new FailCrcCheckException("Buffer did not match CRC validation.");

                var message = new Message
                {
                    Meta = new MessageMetadata { Offset = offset },
                    MagicNumber = stream.ReadByte(),
                    Attribute = stream.ReadByte(),
                    Key = stream.ReadIntPrefixedBytes()
                };

                var codec = (MessageCodec)(ProtocolConstants.AttributeCodeMask & message.Attribute);
                switch (codec)
                {
                    case MessageCodec.CodecNone:
                        message.Value = stream.ReadIntPrefixedBytes();
                        yield return message;
                        break;
                    case MessageCodec.CodecGzip:
                        var gZipData = stream.ReadIntPrefixedBytes();
                        foreach (var m in DecodeMessageSet(Compression.Unzip(gZipData)))
                        {
                            yield return m;
                        }
                        break;
                    default:
                        throw new NotSupportedException(string.Format("Codec type of {0} is not supported.", codec));
                }
            }
        }

	internal ClassFile(byte[] buf, int offset, int length, string inputClassName, bool allowJavaLangObject)
	{
		try
		{
			BigEndianBinaryReader br = new BigEndianBinaryReader(buf, offset, length);
			if (br.ReadUInt32() != 0xCAFEBABE)
			{
				throw new ClassFormatError("{0} (Bad magic number)", inputClassName);
			}
			int minorVersion = br.ReadUInt16();
			majorVersion = br.ReadUInt16();
			if (majorVersion < SupportedVersions.Minimum || majorVersion > SupportedVersions.Maximum)
			{
				throw new UnsupportedClassVersionError(inputClassName + " (" + majorVersion + "." + minorVersion + ")");
			}
			int constantpoolcount = br.ReadUInt16();
			constantpool = new ConstantPoolItem[constantpoolcount];
			utf8_cp = new string[constantpoolcount];
			for (int i = 1; i < constantpoolcount; i++)
			{
				Constant tag = (Constant) br.ReadByte();
				switch (tag)
				{
					case Constant.Class:
						constantpool[i] = new ConstantPoolItemClass(br);
						break;
					case Constant.Double:
						constantpool[i] = new ConstantPoolItemDouble(br);
						i++;
						break;
					case Constant.Fieldref:
						constantpool[i] = new ConstantPoolItemFieldref(br);
						break;
					case Constant.Float:
						constantpool[i] = new ConstantPoolItemFloat(br);
						break;
					case Constant.Integer:
						constantpool[i] = new ConstantPoolItemInteger(br);
						break;
					case Constant.InterfaceMethodref:
						constantpool[i] = new ConstantPoolItemInterfaceMethodref(br);
						break;
					case Constant.Long:
						constantpool[i] = new ConstantPoolItemLong(br);
						i++;
						break;
					case Constant.Methodref:
						constantpool[i] = new ConstantPoolItemMethodref(br);
						break;
					case Constant.NameAndType:
						constantpool[i] = new ConstantPoolItemNameAndType(br);
						break;
					case Constant.String:
						constantpool[i] = new ConstantPoolItemString(br);
						break;
					case Constant.Utf8:
						utf8_cp[i] = br.ReadString(inputClassName);
						break;
					default:
						throw new ClassFormatError("{0} (Illegal constant pool type 0x{1:X})", inputClassName, tag);
				}
			}
			for (int i = 1; i < constantpoolcount; i++)
			{
				if (constantpool[i] != null)
				{
					try
					{
						constantpool[i].Resolve(this);
					}
					catch (ClassFormatError x)
					{
						// HACK at this point we don't yet have the class name, so any exceptions throw
						// are missing the class name
						throw new ClassFormatError("{0} ({1})", inputClassName, x.Message);
					}
					catch (IndexOutOfRangeException)
					{
						throw new ClassFormatError("{0} (Invalid constant pool item #{1})", inputClassName, i);
					}
					catch (InvalidCastException)
					{
						throw new ClassFormatError("{0} (Invalid constant pool item #{1})", inputClassName, i);
					}
				}
			}
			access_flags = (__Modifiers) br.ReadUInt16();
			// NOTE although the vmspec says (in 4.1) that interfaces must be marked abstract, earlier versions of
			// javac (JDK 1.1) didn't do this, so the VM doesn't enforce this rule
			// NOTE although the vmspec implies (in 4.1) that ACC_SUPER is illegal on interfaces, it doesn't enforce this
			if ((IsInterface && IsFinal) || (IsAbstract && IsFinal))
			{
				throw new ClassFormatError("{0} (Illegal class modifiers 0x{1:X})", inputClassName, access_flags);
			}
			this_class = br.ReadUInt16();
			ValidateConstantPoolItemClass(inputClassName, this_class);
			super_class = br.ReadUInt16();
			// NOTE for convenience we allow parsing java/lang/Object (which has no super class), so
			// we check for super_class != 0
			if (super_class != 0)
//.........這裏部分代碼省略.........

 ConstantPool[] ReadConstantPool(BigEndianBinaryReader reader)
 {
     ushort constantPoolCount = reader.ReadUInt16();
     ConstantPool[] constantPool = new ConstantPool[constantPoolCount];
     //Console.WriteLine("Reading {0} ConstantPool items", constantPoolCount);
     // JVM Spec 4.1.
     // The value of the constant_pool_count item is equal to the number
     // of entries in the constant_pool table plus one. A constant_pool
     // index is considered valid if it is greater than zero and less
     // than constant_pool_count, with the exception for constants of
     // type long and double noted in 4.4.5.
     for (ushort i = 1; i < constantPoolCount; i++) {
         ConstantType tag = (ConstantType) reader.ReadByte();
         ConstantPool item = new ConstantPool();
         constantPool[i] = item;
         switch (tag) {
             case ConstantType.Class:
                 /*
                     CONSTANT_Class_info {
                         u1 tag;
                         u2 name_index;
                     }
                 */
                 item.ConstantType = ConstantType.Class;
                 item.NameIndex = reader.ReadUInt16();
                 break;
             case ConstantType.Fieldref:
                 /*
                     CONSTANT_Fieldref_info {
                         u1 tag;
                         u2 class_index;
                         u2 name_and_type_index;
                     }
                 */
                 item.ConstantType = ConstantType.Fieldref;
                 item.ClassIndex = reader.ReadUInt16();
                 item.NameAndTypeIndex = reader.ReadUInt16();
                 break;
             case ConstantType.Methodref:
                 /*
                     CONSTANT_Methodref_info {
                         u1 tag;
                         u2 class_index;
                         u2 name_and_type_index;
                     }
                 */
                 item.ConstantType = ConstantType.Methodref;
                 item.ClassIndex = reader.ReadUInt16();
                 item.NameAndTypeIndex = reader.ReadUInt16();
                 break;
             case ConstantType.InterfaceMethodref:
                 /*
                     CONSTANT_InterfaceMethodref_info {
                         u1 tag;
                         u2 class_index;
                         u2 name_and_type_index;
                     }
                 */
                 item.ConstantType = ConstantType.InterfaceMethodref;
                 item.ClassIndex = reader.ReadUInt16();
                 item.NameAndTypeIndex = reader.ReadUInt16();
                 break;
             case ConstantType.String:
                 /*
                     CONSTANT_String_info {
                         u1 tag;
                         u2 string_index;
                     }
                 */
                 item.ConstantType = ConstantType.String;
                 item.StringIndex = reader.ReadUInt16();
                 break;
             case ConstantType.Integer:
                 /*
                     CONSTANT_Integer_info {
                         u1 tag;
                         u4 bytes;
                     }
                 */
                 item.ConstantType = ConstantType.Integer;
                 item.Integer = reader.ReadInt32();
                 break;
             case ConstantType.Float:
                 /*
                     CONSTANT_Float_info {
                         u1 tag;
                         u4 bytes;
                     }
                 */
                 item.ConstantType = ConstantType.Float;
                 item.Float = reader.ReadSingle();
                 break;
             case ConstantType.Long:
                 /*
                     CONSTANT_Long_info {
                         u1 tag;
                         u4 high_bytes;
                         u4 low_bytes;
                     }
                 */
//.........這裏部分代碼省略.........

		private static object ReadAnnotationElementValue(BigEndianBinaryReader rdr, ClassFile classFile)
		{
			byte tag = rdr.ReadByte();
			switch(tag)
			{
				case (byte)'Z':
					return classFile.GetConstantPoolConstantInteger(rdr.ReadUInt16()) != 0;
				case (byte)'B':
					return (byte)classFile.GetConstantPoolConstantInteger(rdr.ReadUInt16());
				case (byte)'C':
					return (char)classFile.GetConstantPoolConstantInteger(rdr.ReadUInt16());
				case (byte)'S':
					return (short)classFile.GetConstantPoolConstantInteger(rdr.ReadUInt16());
				case (byte)'I':
					return classFile.GetConstantPoolConstantInteger(rdr.ReadUInt16());
				case (byte)'F':
					return classFile.GetConstantPoolConstantFloat(rdr.ReadUInt16());
				case (byte)'J':
					return classFile.GetConstantPoolConstantLong(rdr.ReadUInt16());
				case (byte)'D':
					return classFile.GetConstantPoolConstantDouble(rdr.ReadUInt16());
				case (byte)'s':
					return classFile.GetConstantPoolUtf8String(rdr.ReadUInt16());
				case (byte)'e':
				{
					ushort type_name_index = rdr.ReadUInt16();
					ushort const_name_index = rdr.ReadUInt16();
					return new object[] {
											AnnotationDefaultAttribute.TAG_ENUM,
											classFile.GetConstantPoolUtf8String(type_name_index),
											classFile.GetConstantPoolUtf8String(const_name_index)
										};
				}
				case (byte)'c':
					return new object[] {
											AnnotationDefaultAttribute.TAG_CLASS,
											classFile.GetConstantPoolUtf8String(rdr.ReadUInt16())
										};
				case (byte)'@':
					return ReadAnnotation(rdr, classFile);
				case (byte)'[':
				{
					ushort num_values = rdr.ReadUInt16();
					object[] array = new object[num_values + 1];
					array[0] = AnnotationDefaultAttribute.TAG_ARRAY;
					for(int i = 0; i < num_values; i++)
					{
						array[i + 1] = ReadAnnotationElementValue(rdr, classFile);
					}
					return array;
				}
				default:
					throw new ClassFormatError("Invalid tag {0} in annotation element_value", tag);
			}
		}