def name_and_type(name_index, descriptor_index):
return u1(id_NameAndType) \
+ u2(name_index) \
+ u2(descriptor_index)
def string(utf8str):
return u1(id_String) \
+ u2(utf8str)
def field_ref(class_index, name_and_type_index):
return u1(id_Fieldref) \
+ u2(class_index) \
+ u2(name_and_type_index)
def utf8(text):
return u1(id_Utf8) \
+ u2(len(text)) \
+ str_to_byte(text)
def class_ref(name_index):
return u1(id_Class) \
+ u2(name_index)
def method_ref(class_index, name_and_type_index):
return u1(id_Methodref) \
+ u2(class_index) \
+ u2(name_and_type_index)
def invokestatic(ref):
return u1(0xB8) + u2(ref)
def _write(self, stream):
# Java java_class file header (constant bytes + versions).
stream.write(u4(Exporter.JAVA_FILE_HEADER))
stream.write(u2(self.output_class.version[1]))
stream.write(u2(self.output_class.version[0]))
# Pool table
stream.write(u2(len(self.output_class.pool) + 1))
for entry in self.output_class.pool:
stream.write(entry)
# Access modifiers
stream.write(u2(reduce(operator.xor, self.output_class.access_modifiers)))
# "This" and "Super" classes
stream.write(u2(self.output_class.pool.this_index))
stream.write(u2(self.output_class.pool.super_index))
# Interface table (not implemented)
stream.write(u2(0))
# Field table
stream.write(u2(len(self.output_class.fields)))
for field in self.output_class.fields:
stream.write(u2(field.access_flags))
stream.write(u2(field.name_index))
stream.write(u2(field.descriptor_index))
stream.write(u2(0)) # Writing fields with attributes has not been implemented.
# Methods table
stream.write(u2(len(self.output_class.methods)))
for name_index, descriptor_index, access_flags, attributes in self.output_class.methods:
stream.write(u2(access_flags))
stream.write(u2(name_index))
stream.write(u2(descriptor_index))
stream.write(u2(len(attributes)))
# Attributes table within method table (e.g. contains "Code" attribute)
for attribute in attributes:
stream.write(u2(attribute["code_attribute_index"]))
stream.write(u4(12 + attribute["code_length"]))
stream.write(u2(attribute["max_stack"]))
stream.write(u2(attribute["max_locals"]))
stream.write(u4(attribute["code_length"]))
for instruction in attribute["instructions"]:
stream.write(instruction)
stream.write(u2(0)) # Exception table not implemented
stream.write(u2(0)) # Attributes of attributes not implemented
# Attributes table (not implemented)
stream.write(u2(0))
def getstatic(field_index):
return u1(0xB2) + u2(field_index)
def getfield(ref):
return u1(0xB4) + u2(ref)
def putstatic(ref):
return u1(0xB3) + u2(ref)
def putfield(ref):
return u1(0xB5) + u2(ref)
def invokevirtual(method):
return u1(0xB6) + u2(method)