public static IAttribute ReadAttribute(this ClassReader reader, ConstantPool pool)
{
var nameIndex = reader.ReadU2();
var length = reader.ReadU4();
var name = pool.GetUtf8String(nameIndex);
if (!Enum.TryParse <AttributeType>(name, true, out var type))
{
type = AttributeType.Unparsed;
}
switch (type)
{
case AttributeType.Deprecated:
return(new DeprecatedAttribute());
case AttributeType.Synthetic:
return(new SyntheticAttribute());
case AttributeType.SourceFile:
var fileNameIndex = reader.ReadU2();
return(new SourceFileAttribute(pool.GetUtf8String(fileNameIndex)));
case AttributeType.ConstantValue:
var constantIndex = reader.ReadU2();
return(new ConstantValueAttribute(pool.GetConstant(constantIndex)));
case AttributeType.Code:
ushort stack = reader.ReadU2(), locals = reader.ReadU2();
var codelength = reader.ReadU4();
var code = reader.ReadBytes((int)codelength);
return(new CodeAttribute(stack, locals, code, ReadExceptionTables(reader), ReadAttributes(reader, pool)));
case AttributeType.Exceptions:
return(new ExceptionsAttribute(reader.ReadU2S()));
case AttributeType.LineNumberTable:
return(new LineNumberTableAttribute(ReadLineNumberTableEntrys(reader)));
case AttributeType.LocalVariableTable:
return(new LocalVariableTableAttribute(ReadLocalVariableTableEntrys(reader)));
}
return(new UnparsedAttribute(reader.ReadBytes((int)length)));
}
static void Main(string[] args)
{
var jrePath = Environment.GetEnvironmentVariable("JAVA_HOME");
var entry = EntryFactory.CreateEntry(Path.Combine(jrePath, "jre", "*"));
var data = entry.ReadClass("java.lang.Object");
Console.WriteLine(data);
var reader = new ClassReader(data);//@"E:\workcode\zbj\八戒招聘\hr-saas\zbj-zhaopin-admin\zbj-hr-saas-web-manage-ui\target\classes\com\zbj\hr\listener\TaskServlet.class"
Console.WriteLine("jvm class magic:{0}", reader.ReadU4());
}
public void ReadAttributeInfo(ClassReader classReader, ConstantPool constantPool)
{
this.attributeLength = classReader.ReadU4();
Read(classReader, constantPool);
}