unpack wxapkg

unwxapkg.py

#!/usr/bin/python
 
# usage python unwxapkg.py filename
 
import sys,os
import struct
 
class WxapkgFile:
  nameLen = 0
  name = ""
  offset = 0
  size = 0

if len(sys.argv) < 2:
  print 'usage: unwxapkg.py filename'
  exit()

with open(sys.argv[1], "rb") as f:
 
  root = os.path.dirname(os.path.realpath(f.name))
  name = os.path.basename(f.name)

  if len(sys.argv) > 2:
    name = sys.argv[2]
 
  #read header
 
  firstMark = struct.unpack('B', f.read(1))[0]
  print 'first header mark = ' + str(firstMark)
 
  info1 = struct.unpack('>L', f.read(4))[0]
  print 'info1 = ' + str(info1)
 
  indexInfoLength = struct.unpack('>L', f.read(4))[0]
  print 'indexInfoLength = ' + str(indexInfoLength)
 
  bodyInfoLength = struct.unpack('>L', f.read(4))[0]
  print 'bodyInfoLength = ' + str(bodyInfoLength)
 
  lastMark = struct.unpack('B', f.read(1))[0]
  print 'last header mark = ' + str(lastMark)
 
  if firstMark != 0xBE or lastMark != 0xED:
    print 'its not a wxapkg file!!!!!'
    exit()
 
  fileCount = struct.unpack('>L', f.read(4))[0]
  print 'fileCount = ' + str(fileCount)
 
  #read index
 
  fileList = []
 
  for i in range(fileCount):
 
    data = WxapkgFile()
    data.nameLen = struct.unpack('>L', f.read(4))[0]
    data.name = f.read(data.nameLen)
    data.offset = struct.unpack('>L', f.read(4))[0]
    data.size = struct.unpack('>L', f.read(4))[0]
 
    print 'readFile = ' + data.name + ' at Offset = ' + str(data.offset)
 
    fileList.append(data)
 
  #save files
   
  for d in fileList:
    d.name = '/' + name + d.name
    path = root + os.path.dirname(d.name)
 
    if not os.path.exists(path):
      os.makedirs(path)
 
    w = open(root + d.name, 'w')
    f.seek(d.offset)
    w.write(f.read(d.size))
    w.close()
 
    print 'writeFile = ' + root + d.name
 
  f.close()

现在包的结构好像不一样了？

readFile = /res/second_door.png at Offset = 1040043
readFile = /res/shadow.png at Offset = 1040172
readFile = /res/sing.mp3 at Offset = 1043030
readFile = /res/sing.png at Offset = 1218259
readFile = /res/start.mp3 at Offset = 1255521
readFile = /res/stool_shadow.png at Offset = 1349606
readFile = /res/stool.png at Offset = 1350007
readFile = /res/store_bottom.png at Offset = 1417457
readFile = /res/store_top.png at Offset = 1417857
readFile = /res/store.mp3 at Offset = 1419563
readFile = /res/stripe.png at Offset = 1481003
readFile = /res/suc.png at Offset = 1481096
readFile = /res/success.mp3 at Offset = 1481774
readFile = /res/tired.png at Offset = 1523614
readFile = /res/tit.png at Offset = 1570337
readFile = /res/title.png at Offset = 1645322
readFile = /res/top.png at Offset = 1667024
readFile = /res/water.mp3 at Offset = 1668356
readFile = /res/well.png at Offset = 1725888
readFile = /res/westore_desk.png at Offset = 1809459
readFile = /res/westore.png at Offset = 1811384
readFile = /res/white_face.png at Offset = 1813702
readFile = /res/white.png at Offset = 1815449
readFile = /res/气泡狗白脸.png at Offset = 1815876
readFile = /game.js at Offset = 1818878
Traceback (most recent call last):
  File "unwxapkg.py", line 73, in <module>
    w = open(root + d.name, 'w')
IOError: [Errno 20] Not a directory: '/mnt/d/temp/wxapp/3.wxapkg/app-config.json'

重新改了一版

# -*- coding:utf-8 -*-
# usage python unwxapkg.py filename
import sys,os
import struct
 
class WxapkgFile:
  nameLen = 0
  name = ""
  offset = 0
  size = 0

if len(sys.argv) < 2:
  print 'usage: unwxapkg.py filename'
  exit()

with open(sys.argv[1], "rb") as f:
 
  root = os.path.dirname(os.path.realpath(f.name))
  name = os.path.basename(f.name)

  if len(sys.argv) > 2:
    name = sys.argv[2]
 
  #read header
 
  firstMark = struct.unpack('B', f.read(1))[0]
  print 'first header mark = ' + str(firstMark)
 
  info1 = struct.unpack('>L', f.read(4))[0]
  print 'info1 = ' + str(info1)
 
  indexInfoLength = struct.unpack('>L', f.read(4))[0]
  print 'indexInfoLength = ' + str(indexInfoLength)
 
  bodyInfoLength = struct.unpack('>L', f.read(4))[0]
  print 'bodyInfoLength = ' + str(bodyInfoLength)
 
  lastMark = struct.unpack('B', f.read(1))[0]
  print 'last header mark = ' + str(lastMark)
 
  if firstMark != 0xBE or lastMark != 0xED:
    print 'its not a wxapkg file!!!!!'
    exit()
 
  fileCount = struct.unpack('>L', f.read(4))[0]
  print 'fileCount = ' + str(fileCount)
 
  #read index
 
  fileList = []
 
  for i in range(fileCount):
 
    data = WxapkgFile()
    data.nameLen = struct.unpack('>L', f.read(4))[0]
    data.name = f.read(data.nameLen)
    data.offset = struct.unpack('>L', f.read(4))[0]
    data.size = struct.unpack('>L', f.read(4))[0]
 
    print 'readFile = ' + data.name + ' at Offset = ' + str(data.offset)
 
    fileList.append(data)
 
  #save files
   
  for d in fileList:

    dir = os.path.dirname(root + d.name)
    path = root + d.name
    if not os.path.exists(dir):
        os.makedirs(dir)
    try:
        w = open(path, 'w')
        print "w:", w
        f.seek(d.offset)
        w.write(f.read(d.size))
        w.close()
        print "写入成功 :", path

    except Exception as e:
        print "写入失败:", path
 

f.close()

@seozed 你这个改动，最后都是写入失败，虽然创建了文件，但都是空啊。

usage python unwxapkg.py filename 请问这个路径怎么拼，我这样执行不对么

@piao6236703 你这是版本问题，2的 print 'xxx', 3的print('xxx')

稍微改了一下应该可以用

#!/usr/bin/python

# usage python unwxapkg.py filename

import sys, os
import struct


class WxapkgFile:
    nameLen = 0
    name = ""
    offset = 0
    size = 0


if len(sys.argv) < 2:
    print 'usage: unwxapkg.py filename'
    exit()

with open(sys.argv[1], "rb") as f:

    root = os.path.dirname(os.path.realpath(f.name))
    name = os.path.basename(f.name)

    if len(sys.argv) > 2:
        name = sys.argv[2]

    #read header

    firstMark = struct.unpack('B', f.read(1))[0]
    print 'first header mark = ' + str(firstMark)

    info1 = struct.unpack('>L', f.read(4))[0]
    print 'info1 = ' + str(info1)

    indexInfoLength = struct.unpack('>L', f.read(4))[0]
    print 'indexInfoLength = ' + str(indexInfoLength)

    bodyInfoLength = struct.unpack('>L', f.read(4))[0]
    print 'bodyInfoLength = ' + str(bodyInfoLength)

    lastMark = struct.unpack('B', f.read(1))[0]
    print 'last header mark = ' + str(lastMark)

    if firstMark != 0xBE or lastMark != 0xED:
        print 'its not a wxapkg file!!!!!'
        exit()

    fileCount = struct.unpack('>L', f.read(4))[0]
    print 'fileCount = ' + str(fileCount)

    #read index

    fileList = []

    for i in range(fileCount):

        data = WxapkgFile()
        data.nameLen = struct.unpack('>L', f.read(4))[0]
        data.name = f.read(data.nameLen)
        data.offset = struct.unpack('>L', f.read(4))[0]
        data.size = struct.unpack('>L', f.read(4))[0]

        print 'readFile = ' + data.name + ' at Offset = ' + str(data.offset)

        fileList.append(data)

    #save files

    for d in fileList:
        path = root + '/' + name + '_'
        file_ = path + d.name

        if not os.path.exists(os.path.dirname(file_)):
            os.makedirs(os.path.dirname(file_))

        w = open(file_, 'w')
        f.seek(d.offset)
        w.write(f.read(d.size))
        w.close()

        print 'writeFile = ' + file_

    f.close()

写入文件语句 w = open(file_, 'w') 改为 w = open(file_, 'wb') 资源文件是二进制的格式需要用二进制方式操作，否则会出现图片和音乐格式错误

fork了一版python3的，亲测可用，需要的亲自下，感谢作者

raceback (most recent call last):
File "index.py", line 30, in
firstMark = struct.unpack('B', f.read(1))[0]
struct.error: unpack requires a string argument of length 1