mirror of
https://github.com/noDRM/DeDRM_tools.git
synced 2024-11-05 13:36:10 +06:00
157 lines
4.7 KiB
Python
157 lines
4.7 KiB
Python
#!/usr/bin/env python
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import sys
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import zlib
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import zipfile
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import os
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import os.path
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import getopt
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from struct import unpack
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_FILENAME_LEN_OFFSET = 26
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_EXTRA_LEN_OFFSET = 28
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_FILENAME_OFFSET = 30
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_MAX_SIZE = 64 * 1024
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_MIMETYPE = 'application/epub+zip'
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class ZipInfo(zipfile.ZipInfo):
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def __init__(self, *args, **kwargs):
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if 'compress_type' in kwargs:
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compress_type = kwargs.pop('compress_type')
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super(ZipInfo, self).__init__(*args, **kwargs)
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self.compress_type = compress_type
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class fixZip:
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def __init__(self, zinput, zoutput):
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self.ztype = 'zip'
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if zinput.lower().find('.epub') >= 0 :
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self.ztype = 'epub'
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self.inzip = zipfile.ZipFile(zinput,'r')
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self.outzip = zipfile.ZipFile(zoutput,'w')
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# open the input zip for reading only as a raw file
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self.bzf = file(zinput,'rb')
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def getlocalname(self, zi):
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local_header_offset = zi.header_offset
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self.bzf.seek(local_header_offset + _FILENAME_LEN_OFFSET)
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leninfo = self.bzf.read(2)
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local_name_length, = unpack('<H', leninfo)
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self.bzf.seek(local_header_offset + _FILENAME_OFFSET)
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local_name = self.bzf.read(local_name_length)
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return local_name
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def uncompress(self, cmpdata):
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dc = zlib.decompressobj(-15)
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data = ''
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while len(cmpdata) > 0:
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if len(cmpdata) > _MAX_SIZE :
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newdata = cmpdata[0:_MAX_SIZE]
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cmpdata = cmpdata[_MAX_SIZE:]
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else:
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newdata = cmpdata
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cmpdata = ''
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newdata = dc.decompress(newdata)
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unprocessed = dc.unconsumed_tail
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if len(unprocessed) == 0:
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newdata += dc.flush()
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data += newdata
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cmpdata += unprocessed
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unprocessed = ''
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return data
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def getfiledata(self, zi):
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# get file name length and exta data length to find start of file data
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local_header_offset = zi.header_offset
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self.bzf.seek(local_header_offset + _FILENAME_LEN_OFFSET)
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leninfo = self.bzf.read(2)
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local_name_length, = unpack('<H', leninfo)
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self.bzf.seek(local_header_offset + _EXTRA_LEN_OFFSET)
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exinfo = self.bzf.read(2)
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extra_field_length, = unpack('<H', exinfo)
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self.bzf.seek(local_header_offset + _FILENAME_OFFSET + local_name_length + extra_field_length)
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data = None
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# if not compressed we are good to go
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if zi.compress_type == zipfile.ZIP_STORED:
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data = self.bzf.read(zi.file_size)
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# if compressed we must decompress it using zlib
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if zi.compress_type == zipfile.ZIP_DEFLATED:
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cmpdata = self.bzf.read(zi.compress_size)
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data = self.uncompress(cmpdata)
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return data
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def fix(self):
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# get the zipinfo for each member of the input archive
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# and copy member over to output archive
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# if problems exist with local vs central filename, fix them
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# if epub write mimetype file first, with no compression
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if self.ztype == 'epub':
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nzinfo = ZipInfo('mimetype', compress_type=zipfile.ZIP_STORED)
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self.outzip.writestr(nzinfo, _MIMETYPE)
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# write the rest of the files
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for zinfo in self.inzip.infolist():
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if zinfo.filename != "mimetype" or self.ztype == '.zip':
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data = None
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nzinfo = zinfo
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try:
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data = self.inzip.read(zinfo.filename)
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except zipfile.BadZipfile or zipfile.error:
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local_name = self.getlocalname(zinfo)
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data = self.getfiledata(zinfo)
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nzinfo.filename = local_name
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nzinfo.date_time = zinfo.date_time
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nzinfo.compress_type = zinfo.compress_type
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nzinfo.flag_bits = 0
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nzinfo.internal_attr = 0
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self.outzip.writestr(nzinfo,data)
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self.bzf.close()
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self.inzip.close()
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self.outzip.close()
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def usage():
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print """usage: zipfix.py inputzip outputzip
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inputzip is the source zipfile to fix
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outputzip is the fixed zip archive
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"""
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def repairBook(infile, outfile):
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if not os.path.exists(infile):
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print "Error: Input Zip File does not exist"
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return 1
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try:
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fr = fixZip(infile, outfile)
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fr.fix()
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return 0
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except Exception, e:
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print "Error Occurred ", e
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return 2
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def main(argv=sys.argv):
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if len(argv)!=3:
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usage()
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return 1
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infile = argv[1]
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outfile = argv[2]
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return repairBook(infile, outfile)
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if __name__ == '__main__' :
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sys.exit(main())
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