读取java中的字节流数据

BinaryStream.py

# -*-coding: utf-8 -*-
from struct import *

class BinaryStream:
    def __init__(self,base_stream):
        self.base_stream = base_stream
        self.offset = 0

    def readBytes(self,length):
        string, =  unpack_from(str(length) + 's',self.base_stream[self.offset:])
        self.offset += calcsize(str(length) + 's')
        self.offset +=1
        return string

    def readUTF(self):
        length, = unpack_from('!H',self.base_stream[self.offset:])
        self.offset +=calcsize('!H')
        string, =  unpack_from(str(length) + 's',self.base_stream[self.offset:])
        self.offset +=calcsize(str(length) + 's')
        return string


    def readLong(self):
        num, = unpack_from('!Q',self.base_stream[self.offset:])
        self.offset +=calcsize('!Q')
        return num

    def readInt(self):
        num, =  unpack_from('!I',self.base_stream[self.offset:])
        self.offset += calcsize('!I')
        return num