mirror of
https://github.com/apprenticeharper/DeDRM_tools
synced 2024-11-18 21:25:39 +00:00
485 lines
19 KiB
Python
485 lines
19 KiB
Python
#!/usr/bin/env python
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# vim:ts=4:sw=4:softtabstop=4:smarttab:expandtab
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#
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# erdr2pml.py
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#
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# This is a python script. You need a Python interpreter to run it.
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# For example, ActiveState Python, which exists for windows.
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# Changelog
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#
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# Based on ereader2html version 0.08 plus some later small fixes
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#
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# 0.01 - Initial version
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# 0.02 - Support more eReader files. Support bold text and links. Fix PML decoder parsing bug.
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# 0.03 - Fix incorrect variable usage at one place.
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# 0.03b - enhancement by DeBockle (version 259 support)
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# Custom version 0.03 - no change to eReader support, only usability changes
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# - start of pep-8 indentation (spaces not tab), fix trailing blanks
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# - version variable, only one place to change
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# - added main routine, now callable as a library/module,
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# means tools can add optional support for ereader2html
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# - outdir is no longer a mandatory parameter (defaults based on input name if missing)
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# - time taken output to stdout
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# - Psyco support - reduces runtime by a factor of (over) 3!
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# E.g. (~600Kb file) 90 secs down to 24 secs
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# - newstyle classes
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# - changed map call to list comprehension
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# may not work with python 2.3
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# without Psyco this reduces runtime to 90%
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# E.g. 90 secs down to 77 secs
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# Psyco with map calls takes longer, do not run with map in Psyco JIT!
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# - izip calls used instead of zip (if available), further reduction
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# in run time (factor of 4.5).
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# E.g. (~600Kb file) 90 secs down to 20 secs
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# - Python 2.6+ support, avoid DeprecationWarning with sha/sha1
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# 0.04 - Footnote support, PML output, correct charset in html, support more PML tags
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# - Feature change, dump out PML file
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# - Added supprt for footnote tags. NOTE footnote ids appear to be bad (not usable)
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# in some pdb files :-( due to the same id being used multiple times
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# - Added correct charset encoding (pml is based on cp1252)
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# - Added logging support.
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# 0.05 - Improved type 272 support for sidebars, links, chapters, metainfo, etc
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# 0.06 - Merge of 0.04 and 0.05. Improved HTML output
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# Placed images in subfolder, so that it's possible to just
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# drop the book.pml file onto DropBook to make an unencrypted
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# copy of the eReader file.
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# Using that with Calibre works a lot better than the HTML
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# conversion in this code.
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# 0.07 - Further Improved type 272 support for sidebars with all earlier fixes
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# 0.08 - fixed typos, removed extraneous things
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# 0.09 - fixed typos in first_pages to first_page to again support older formats
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# 0.10 - minor cleanups
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# 0.11 - fixups for using correct xml for footnotes and sidebars for use with Dropbook
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# 0.12 - Fix added to prevent lowercasing of image names when the pml code itself uses a different case in the link name.
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# 0.13 - change to unbuffered stdout for use with gui front ends
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# 0.14 - contributed enhancement to support --make-pmlz switch
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# 0.15 - enabled high-ascii to pml character encoding. DropBook now works on Mac.
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# 0.16 - convert to use openssl DES (very very fast) or pure python DES if openssl's libcrypto is not available
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# 0.17 - added support for pycrypto's DES as well
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# 0.18 - on Windows try PyCrypto first and OpenSSL next
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# 0.19 - Modify the interface to allow use of import
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__version__='0.19'
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class Unbuffered:
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def __init__(self, stream):
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self.stream = stream
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def write(self, data):
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self.stream.write(data)
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self.stream.flush()
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def __getattr__(self, attr):
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return getattr(self.stream, attr)
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import sys
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sys.stdout=Unbuffered(sys.stdout)
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import struct, binascii, getopt, zlib, os, os.path, urllib, tempfile
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Des = None
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if sys.platform.startswith('win'):
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# first try with pycrypto
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import pycrypto_des
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Des = pycrypto_des.load_pycrypto()
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if Des == None:
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# they try with openssl
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import openssl_des
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Des = openssl_des.load_libcrypto()
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else:
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# first try with openssl
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import openssl_des
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Des = openssl_des.load_libcrypto()
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if Des == None:
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# then try with pycrypto
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import pycrypto_des
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Des = pycrypto_des.load_pycrypto()
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# if that did not work then use pure python implementation
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# of DES and try to speed it up with Psycho
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if Des == None:
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import python_des
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Des = python_des.Des
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# Import Psyco if available
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try:
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# http://psyco.sourceforge.net
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import psyco
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psyco.full()
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except ImportError:
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pass
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try:
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from hashlib import sha1
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except ImportError:
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# older Python release
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import sha
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sha1 = lambda s: sha.new(s)
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import cgi
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import logging
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logging.basicConfig()
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#logging.basicConfig(level=logging.DEBUG)
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class Sectionizer(object):
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def __init__(self, filename, ident):
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self.contents = file(filename, 'rb').read()
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self.header = self.contents[0:72]
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self.num_sections, = struct.unpack('>H', self.contents[76:78])
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if self.header[0x3C:0x3C+8] != ident:
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raise ValueError('Invalid file format')
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self.sections = []
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for i in xrange(self.num_sections):
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offset, a1,a2,a3,a4 = struct.unpack('>LBBBB', self.contents[78+i*8:78+i*8+8])
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flags, val = a1, a2<<16|a3<<8|a4
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self.sections.append( (offset, flags, val) )
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def loadSection(self, section):
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if section + 1 == self.num_sections:
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end_off = len(self.contents)
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else:
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end_off = self.sections[section + 1][0]
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off = self.sections[section][0]
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return self.contents[off:end_off]
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def sanitizeFileName(s):
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r = ''
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for c in s:
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if c in "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_.-":
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r += c
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return r
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def fixKey(key):
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def fixByte(b):
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return b ^ ((b ^ (b<<1) ^ (b<<2) ^ (b<<3) ^ (b<<4) ^ (b<<5) ^ (b<<6) ^ (b<<7) ^ 0x80) & 0x80)
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return "".join([chr(fixByte(ord(a))) for a in key])
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def deXOR(text, sp, table):
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r=''
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j = sp
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for i in xrange(len(text)):
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r += chr(ord(table[j]) ^ ord(text[i]))
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j = j + 1
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if j == len(table):
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j = 0
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return r
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class EreaderProcessor(object):
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def __init__(self, section_reader, username, creditcard):
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self.section_reader = section_reader
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data = section_reader(0)
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version, = struct.unpack('>H', data[0:2])
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self.version = version
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logging.info('eReader file format version %s', version)
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if version != 272 and version != 260 and version != 259:
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raise ValueError('incorrect eReader version %d (error 1)' % version)
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data = section_reader(1)
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self.data = data
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des = Des(fixKey(data[0:8]))
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cookie_shuf, cookie_size = struct.unpack('>LL', des.decrypt(data[-8:]))
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if cookie_shuf < 3 or cookie_shuf > 0x14 or cookie_size < 0xf0 or cookie_size > 0x200:
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raise ValueError('incorrect eReader version (error 2)')
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input = des.decrypt(data[-cookie_size:])
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def unshuff(data, shuf):
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r = [''] * len(data)
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j = 0
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for i in xrange(len(data)):
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j = (j + shuf) % len(data)
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r[j] = data[i]
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assert len("".join(r)) == len(data)
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return "".join(r)
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r = unshuff(input[0:-8], cookie_shuf)
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def fixUsername(s):
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r = ''
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for c in s.lower():
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if (c >= 'a' and c <= 'z' or c >= '0' and c <= '9'):
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r += c
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return r
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user_key = struct.pack('>LL', binascii.crc32(fixUsername(username)) & 0xffffffff, binascii.crc32(creditcard[-8:])& 0xffffffff)
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drm_sub_version = struct.unpack('>H', r[0:2])[0]
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self.num_text_pages = struct.unpack('>H', r[2:4])[0] - 1
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self.num_image_pages = struct.unpack('>H', r[26:26+2])[0]
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self.first_image_page = struct.unpack('>H', r[24:24+2])[0]
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if self.version == 272:
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self.num_footnote_pages = struct.unpack('>H', r[46:46+2])[0]
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self.first_footnote_page = struct.unpack('>H', r[44:44+2])[0]
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self.num_sidebar_pages = struct.unpack('>H', r[38:38+2])[0]
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self.first_sidebar_page = struct.unpack('>H', r[36:36+2])[0]
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# self.num_bookinfo_pages = struct.unpack('>H', r[34:34+2])[0]
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# self.first_bookinfo_page = struct.unpack('>H', r[32:32+2])[0]
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# self.num_chapter_pages = struct.unpack('>H', r[22:22+2])[0]
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# self.first_chapter_page = struct.unpack('>H', r[20:20+2])[0]
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# self.num_link_pages = struct.unpack('>H', r[30:30+2])[0]
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# self.first_link_page = struct.unpack('>H', r[28:28+2])[0]
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# self.num_xtextsize_pages = struct.unpack('>H', r[54:54+2])[0]
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# self.first_xtextsize_page = struct.unpack('>H', r[52:52+2])[0]
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# **before** data record 1 was decrypted and unshuffled, it contained data
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# to create an XOR table and which is used to fix footnote record 0, link records, chapter records, etc
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self.xortable_offset = struct.unpack('>H', r[40:40+2])[0]
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self.xortable_size = struct.unpack('>H', r[42:42+2])[0]
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self.xortable = self.data[self.xortable_offset:self.xortable_offset + self.xortable_size]
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else:
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self.num_footnote_pages = 0
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self.num_sidebar_pages = 0
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self.first_footnote_page = -1
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self.first_sidebar_page = -1
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# self.num_bookinfo_pages = 0
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# self.num_chapter_pages = 0
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# self.num_link_pages = 0
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# self.num_xtextsize_pages = 0
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# self.first_bookinfo_page = -1
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# self.first_chapter_page = -1
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# self.first_link_page = -1
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# self.first_xtextsize_page = -1
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logging.debug('self.num_text_pages %d', self.num_text_pages)
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logging.debug('self.num_footnote_pages %d, self.first_footnote_page %d', self.num_footnote_pages , self.first_footnote_page)
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logging.debug('self.num_sidebar_pages %d, self.first_sidebar_page %d', self.num_sidebar_pages , self.first_sidebar_page)
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self.flags = struct.unpack('>L', r[4:8])[0]
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reqd_flags = (1<<9) | (1<<7) | (1<<10)
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if (self.flags & reqd_flags) != reqd_flags:
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print "Flags: 0x%X" % self.flags
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raise ValueError('incompatible eReader file')
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des = Des(fixKey(user_key))
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if version == 259:
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if drm_sub_version != 7:
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raise ValueError('incorrect eReader version %d (error 3)' % drm_sub_version)
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encrypted_key_sha = r[44:44+20]
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encrypted_key = r[64:64+8]
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elif version == 260:
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if drm_sub_version != 13:
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raise ValueError('incorrect eReader version %d (error 3)' % drm_sub_version)
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encrypted_key = r[44:44+8]
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encrypted_key_sha = r[52:52+20]
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elif version == 272:
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encrypted_key = r[172:172+8]
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encrypted_key_sha = r[56:56+20]
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self.content_key = des.decrypt(encrypted_key)
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if sha1(self.content_key).digest() != encrypted_key_sha:
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raise ValueError('Incorrect Name and/or Credit Card')
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def getNumImages(self):
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return self.num_image_pages
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def getImage(self, i):
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sect = self.section_reader(self.first_image_page + i)
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name = sect[4:4+32].strip('\0')
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data = sect[62:]
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return sanitizeFileName(name), data
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# def getChapterNamePMLOffsetData(self):
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# cv = ''
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# if self.num_chapter_pages > 0:
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# for i in xrange(self.num_chapter_pages):
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# chaps = self.section_reader(self.first_chapter_page + i)
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# j = i % self.xortable_size
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# offname = deXOR(chaps, j, self.xortable)
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# offset = struct.unpack('>L', offname[0:4])[0]
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# name = offname[4:].strip('\0')
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# cv += '%d|%s\n' % (offset, name)
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# return cv
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# def getLinkNamePMLOffsetData(self):
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# lv = ''
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# if self.num_link_pages > 0:
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# for i in xrange(self.num_link_pages):
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# links = self.section_reader(self.first_link_page + i)
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# j = i % self.xortable_size
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# offname = deXOR(links, j, self.xortable)
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# offset = struct.unpack('>L', offname[0:4])[0]
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# name = offname[4:].strip('\0')
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# lv += '%d|%s\n' % (offset, name)
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# return lv
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# def getExpandedTextSizesData(self):
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# ts = ''
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# if self.num_xtextsize_pages > 0:
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# tsize = deXOR(self.section_reader(self.first_xtextsize_page), 0, self.xortable)
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# for i in xrange(self.num_text_pages):
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# xsize = struct.unpack('>H', tsize[0:2])[0]
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# ts += "%d\n" % xsize
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# tsize = tsize[2:]
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# return ts
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# def getBookInfo(self):
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# bkinfo = ''
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# if self.num_bookinfo_pages > 0:
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# info = self.section_reader(self.first_bookinfo_page)
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# bkinfo = deXOR(info, 0, self.xortable)
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# bkinfo = bkinfo.replace('\0','|')
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# bkinfo += '\n'
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# return bkinfo
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def getText(self):
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des = Des(fixKey(self.content_key))
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r = ''
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for i in xrange(self.num_text_pages):
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logging.debug('get page %d', i)
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r += zlib.decompress(des.decrypt(self.section_reader(1 + i)))
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# now handle footnotes pages
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if self.num_footnote_pages > 0:
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r += '\n'
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# the record 0 of the footnote section must pass through the Xor Table to make it useful
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sect = self.section_reader(self.first_footnote_page)
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fnote_ids = deXOR(sect, 0, self.xortable)
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# the remaining records of the footnote sections need to be decoded with the content_key and zlib inflated
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des = Des(fixKey(self.content_key))
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for i in xrange(1,self.num_footnote_pages):
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logging.debug('get footnotepage %d', i)
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id_len = ord(fnote_ids[2])
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id = fnote_ids[3:3+id_len]
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fmarker = '<footnote id="%s">\n' % id
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fmarker += zlib.decompress(des.decrypt(self.section_reader(self.first_footnote_page + i)))
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fmarker += '\n</footnote>\n'
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r += fmarker
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fnote_ids = fnote_ids[id_len+4:]
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# now handle sidebar pages
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if self.num_sidebar_pages > 0:
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r += '\n'
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# the record 0 of the sidebar section must pass through the Xor Table to make it useful
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sect = self.section_reader(self.first_sidebar_page)
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sbar_ids = deXOR(sect, 0, self.xortable)
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# the remaining records of the sidebar sections need to be decoded with the content_key and zlib inflated
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des = Des(fixKey(self.content_key))
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for i in xrange(1,self.num_sidebar_pages):
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id_len = ord(sbar_ids[2])
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id = sbar_ids[3:3+id_len]
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smarker = '<sidebar id="%s">\n' % id
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smarker += zlib.decompress(des.decrypt(self.section_reader(self.first_footnote_page + i)))
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smarker += '\n</sidebar>\n'
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r += smarker
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sbar_ids = sbar_ids[id_len+4:]
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return r
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def cleanPML(pml):
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# Convert special characters to proper PML code. High ASCII start at (\x80, \a128) and go up to (\xff, \a255)
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pml2 = pml
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for k in xrange(128,256):
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badChar = chr(k)
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pml2 = pml2.replace(badChar, '\\a%03d' % k)
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return pml2
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def convertEreaderToPml(infile, name, cc, outdir):
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if not os.path.exists(outdir):
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os.makedirs(outdir)
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bookname = os.path.splitext(os.path.basename(infile))[0]
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print " Decoding File"
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sect = Sectionizer(infile, 'PNRdPPrs')
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er = EreaderProcessor(sect.loadSection, name, cc)
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if er.getNumImages() > 0:
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print " Extracting images"
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imagedir = bookname + '_img/'
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imagedirpath = os.path.join(outdir,imagedir)
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if not os.path.exists(imagedirpath):
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os.makedirs(imagedirpath)
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for i in xrange(er.getNumImages()):
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name, contents = er.getImage(i)
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file(os.path.join(imagedirpath, name), 'wb').write(contents)
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print " Extracting pml"
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pml_string = er.getText()
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pmlfilename = bookname + ".pml"
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file(os.path.join(outdir, pmlfilename),'wb').write(cleanPML(pml_string))
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# bkinfo = er.getBookInfo()
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# if bkinfo != '':
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# print " Extracting book meta information"
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# file(os.path.join(outdir, 'bookinfo.txt'),'wb').write(bkinfo)
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def decryptBook(infile, outdir, name, cc, make_pmlz):
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if make_pmlz :
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# ignore specified outdir, use tempdir instead
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outdir = tempfile.mkdtemp()
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try:
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print "Processing..."
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convertEreaderToPml(infile, name, cc, outdir)
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if make_pmlz :
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import zipfile
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import shutil
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print " Creating PMLZ file"
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zipname = infile[:-4] + '.pmlz'
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myZipFile = zipfile.ZipFile(zipname,'w',zipfile.ZIP_STORED, False)
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list = os.listdir(outdir)
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for file in list:
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localname = file
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filePath = os.path.join(outdir,file)
|
|
if os.path.isfile(filePath):
|
|
myZipFile.write(filePath, localname)
|
|
elif os.path.isdir(filePath):
|
|
imageList = os.listdir(filePath)
|
|
localimgdir = os.path.basename(filePath)
|
|
for image in imageList:
|
|
localname = os.path.join(localimgdir,image)
|
|
imagePath = os.path.join(filePath,image)
|
|
if os.path.isfile(imagePath):
|
|
myZipFile.write(imagePath, localname)
|
|
myZipFile.close()
|
|
# remove temporary directory
|
|
shutil.rmtree(outdir, True)
|
|
print 'output is %s' % zipname
|
|
else :
|
|
print 'output in %s' % outdir
|
|
print "done"
|
|
except ValueError, e:
|
|
print "Error: %s" % e
|
|
return 1
|
|
return 0
|
|
|
|
|
|
def usage():
|
|
print "Converts DRMed eReader books to PML Source"
|
|
print "Usage:"
|
|
print " erdr2pml [options] infile.pdb [outdir] \"your name\" credit_card_number "
|
|
print " "
|
|
print "Options: "
|
|
print " -h prints this message"
|
|
print " --make-pmlz create PMLZ instead of using output directory"
|
|
print " "
|
|
print "Note:"
|
|
print " if ommitted, outdir defaults based on 'infile.pdb'"
|
|
print " It's enough to enter the last 8 digits of the credit card number"
|
|
return
|
|
|
|
|
|
def main(argv=None):
|
|
try:
|
|
opts, args = getopt.getopt(sys.argv[1:], "h", ["make-pmlz"])
|
|
except getopt.GetoptError, err:
|
|
print str(err)
|
|
usage()
|
|
return 1
|
|
make_pmlz = False
|
|
for o, a in opts:
|
|
if o == "-h":
|
|
usage()
|
|
return 0
|
|
elif o == "--make-pmlz":
|
|
make_pmlz = True
|
|
|
|
print "eRdr2Pml v%s. Copyright (c) 2009 The Dark Reverser" % __version__
|
|
|
|
if len(args)!=3 and len(args)!=4:
|
|
usage()
|
|
return 1
|
|
|
|
if len(args)==3:
|
|
infile, name, cc = args[0], args[1], args[2]
|
|
outdir = infile[:-4] + '_Source'
|
|
elif len(args)==4:
|
|
infile, outdir, name, cc = args[0], args[1], args[2], args[3]
|
|
|
|
return decryptBook(infile, outdir, name, cc, make_pmlz)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
sys.exit(main())
|
|
|