读取.dex文件中的所有字符串

import structimport os#这里定义一个读取字符串长度的函数def DecUnsignedLEB128(file):    result = struct.unpack("i", file.read(4))[0]#读取4字节中的第一个字节    result = result&0x000000ff      file.seek(-3, 1) #倒退回前面的第三个字节  # 不能直接从1字节强转为4字节，所以先取4字节，再清空3字节    if (result > 0x7f):         next = struct.unpack("i", file.read(4))[0]        next = next&0x000000ff #第一位是个位        file.seek(-3, 1)        result = (result&0x7f) | (next&0x7f)<<7        if(next > 0x7f):            next = struct.unpack("i", file.read(4))[0]            next = next&0x000000ff  #加入十位            file.seek(-3, 1)            result = result | (next&0x7f)<<14            if(next > 0x7f):                next = struct.unpack("i", file.read(4))[0]                next = next&0x000000ff                file.seek(-3, 1)                result = result | (next&0x7f)<<21                if(next > 0x7f):                    next = struct.unpack("i", file.read(4))[0]                    next = next&0x000000ff                    file.seek(-3, 1)                    result = result | next<<28                        #print "result:", result    return resultdex = open("imissTest.dex", 'rb')   #rb的意思是 read and write in binary filedex.seek(0x38, 0)#string table的偏移tmp = dex.read(8)string_count, string_table_off = struct.unpack("II", tmp)  #"II"是分别读取的意思print ("size:", string_count, " off:", string_table_off)dex.seek(string_table_off, 0)DexStrOffList = []count = 0while(count<string_count):    DexStrOffList.append(struct.unpack("i", dex.read(4))[0])#unpack返回一个tuple 取第0个元素    count+=1DexStrList = []nonullcount = 0for stroff in DexStrOffList:    dex.seek(stroff, 0)    strlen = DecUnsignedLEB128(dex)    if(strlen == 0):        continue    input = dex.read(strlen)    DexStrList.append(struct.unpack(str(strlen)+"s", input)) #解析不定长的字符串    nonullcount+=1outputfile = open("string.txt", "w")count = 0print ("string:",string_count)for i in DexStrList:    outputfile.write('%s\n'%i) #将元组中的元素写入文件outputfile.close()dex.close()