unwxapkg.py

#!/usr/bin/env python2
 
# usage python2 unwxapkg.py filename
 
import sys, os
import struct
 
class WxapkgFile(object):
  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) + '_dir'

  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()