def readInfo(self, reader:ClassReader):
self.maxStack = reader.readUint16()
self.maxLocals = reader.readUint16()
codeLength = struct.unpack('>I',reader.readUint32())[0]
self.code = reader.readBytes(codeLength)
self.exceptionTable = readExceptionTable(reader)
self.attributes = readAttributes(reader, self.cp)
def readAttribute(reader:ClassReader, cp:ConstantPool) -> AttributeInfo:
attrNameIndex = reader.readUint16()
attrName = cp.getUtf8(attrNameIndex)
attrLen = struct.unpack('>I',reader.readUint32())[0]
attrInfo = newAttributeInfo(attrName, attrLen, cp)
attrInfo.readInfo(reader)
return attrInfo
def readInfo(self, reader:ClassReader):
lineNumberTableLength = reader.readUint16()
self.lineNumberTable = []
for i in range(lineNumberTableLength):
self.lineNumberTable.append(LineNumberTableEntry(
startPc = reader.readUint16(),
lineNumber = reader.readUint16()))
def readExceptionTable(reader:ClassReader) -> List[ExceptionTableEntry]:
exceptionTableLength = reader.readUint16()
exceptionTable = []
for i in range(exceptionTableLength):
exceptionTable.append(ExceptionTableEntry(
startPc = reader.readUint16(),
endPc = reader.readUint16(),
handlerPc = reader.readUint16(),
catchType = reader.readUint16()))
return exceptionTable
def read(self, reader: ClassReader):
self.readAndCheckMagic(reader)
self.readAndCheckVersion(reader)
self.constantPool = readConstantPool(reader)
self.accessFlags = reader.readUint16()
self.thisClass = reader.readUint16()
self.superClass = reader.readUint16()
self.interfaces = reader.readUint16s()
self.fields = readMembers(reader, self.constantPool)
self.methods = readMembers(reader, self.constantPool)
self.attributes = readAttributes(reader, self.constantPool)
def Parse(classData: bytes):
try:
cr = ClassReader(classData)
cf = ClassFile()
cf.read(cr)
except ValueError as err:
print(sys.exc_info())
return None, err
return cf, None
def readConstantPool(reader: ClassReader) -> ConstantPool:
cpCount = reader.readUint16()
cp = ConstantPool([None] * cpCount)
i = 1
while i < cpCount:
cp[i] = readConstantInfo(reader, cp)
if (isinstance(cp[i], ConstantLongInfo)
or isinstance(cp[i], ConstantDoubleInfo)):
i += 1
i += 1
return cp
def readMember(reader: ClassReader, cp) -> MemberInfo:
return MemberInfo(cp, reader.readUint16(), reader.readUint16(),
reader.readUint16(), readAttributes(reader, cp))
def readMembers(reader: ClassReader, cp) -> List[MemberInfo]:
memberCount = reader.readUint16()
members = []
for i in range(memberCount):
members.append(readMember(reader, cp))
return members
def readConstantInfo(reader: ClassReader, cp) -> ConstantInfo:
tag = reader.readUint8()
c = newConstantInfo(tag, cp)
c.readInfo(reader)
return c
def readInfo(self,reader:ClassReader):
self.classIndex = reader.readUint16()
self.nameAndTypeIndex = reader.readUint16()
def readInfo(self,reader:ClassReader):
self.nameIndex = reader.readUint16()
self.descriptorIndex = reader.readUint16()
def readInfo(self,reader:ClassReader):
self.stringIndex = reader.readUint16()
def readInfo(self,reader:ClassReader):
length = reader.readUint16()
bts = reader.readBytes(length)
self.str = bts.decode('utf-8')
def readInfo(self,reader:ClassReader):
bts = reader.readUint64()
self.val = struct.unpack('>d',bts)[0]
def readAttributes(reader:ClassReader, cp:ConstantPool) -> List[AttributeInfo]:
attributesCount = reader.readUint16()
attributes = []
for i in range(attributesCount):
attributes.append(readAttribute(reader, cp))
return attributes
def readInfo(self, reader:ClassReader):
self.info = reader.readBytes(self.length)
def readInfo(self, reader:ClassReader):
self.exceptionIndexTable = reader.readUint16s()
def readInfo(self, reader:ClassReader):
self.sourceFileIndex = reader.readUint16()
def readInfo(self, reader:ClassReader):
self.constantValueIndex = reader.readUint16()