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Rearrange modules because of single-version-externally-managed
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BasioMeusPuga
120
lector/KindleUnpack/mobi_sectioner.py
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120
lector/KindleUnpack/mobi_sectioner.py
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# vim:ts=4:sw=4:softtabstop=4:smarttab:expandtab
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from __future__ import unicode_literals, division, absolute_import, print_function
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from .compatibility_utils import PY2, hexlify, bstr, bord, bchar
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import datetime
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if PY2:
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range = xrange
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# note: struct pack, unpack, unpack_from all require bytestring format
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# data all the way up to at least python 2.7.5, python 3 okay with bytestring
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import struct
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from .unipath import pathof
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DUMP = False
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""" Set to True to dump all possible information. """
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class unpackException(Exception):
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pass
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def describe(data):
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txtans = ''
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hexans = hexlify(data)
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for i in data:
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if bord(i) < 32 or bord(i) > 127:
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txtans += '?'
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else:
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txtans += bchar(i).decode('latin-1')
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return '"' + txtans + '"' + ' 0x'+ hexans
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def datetimefrompalmtime(palmtime):
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if palmtime > 0x7FFFFFFF:
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pythondatetime = datetime.datetime(year=1904,month=1,day=1)+datetime.timedelta(seconds=palmtime)
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else:
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pythondatetime = datetime.datetime(year=1970,month=1,day=1)+datetime.timedelta(seconds=palmtime)
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return pythondatetime
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class Sectionizer:
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def __init__(self, filename):
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self.data = b''
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with open(pathof(filename), 'rb') as f:
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self.data = f.read()
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self.palmheader = self.data[:78]
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self.palmname = self.data[:32]
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self.ident = self.palmheader[0x3C:0x3C+8]
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self.num_sections, = struct.unpack_from(b'>H', self.palmheader, 76)
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self.filelength = len(self.data)
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sectionsdata = struct.unpack_from(bstr('>%dL' % (self.num_sections*2)), self.data, 78) + (self.filelength, 0)
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self.sectionoffsets = sectionsdata[::2]
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self.sectionattributes = sectionsdata[1::2]
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self.sectiondescriptions = ["" for x in range(self.num_sections+1)]
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self.sectiondescriptions[-1] = "File Length Only"
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return
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def dumpsectionsinfo(self):
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print("Section Offset Length UID Attribs Description")
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for i in range(self.num_sections):
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print("%3d %3X 0x%07X 0x%05X % 8d % 7d %s" % (i,i, self.sectionoffsets[i], self.sectionoffsets[
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i+1] - self.sectionoffsets[i], self.sectionattributes[i]&0xFFFFFF, (self.sectionattributes[i]>>24)&0xFF, self.sectiondescriptions[i]))
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print("%3d %3X 0x%07X %s" %
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(self.num_sections,self.num_sections, self.sectionoffsets[self.num_sections], self.sectiondescriptions[self.num_sections]))
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def setsectiondescription(self, section, description):
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if section < len(self.sectiondescriptions):
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self.sectiondescriptions[section] = description
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else:
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print("Section out of range: %d, description %s" % (section,description))
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def dumppalmheader(self):
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print("Palm Database Header")
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print("Database name: " + repr(self.palmheader[:32]))
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dbattributes, = struct.unpack_from(b'>H', self.palmheader, 32)
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print("Bitfield attributes: 0x%0X" % dbattributes,)
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if dbattributes != 0:
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print(" (",)
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if (dbattributes & 2):
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print("Read-only; ",)
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if (dbattributes & 4):
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print("Dirty AppInfoArea; ",)
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if (dbattributes & 8):
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print("Needs to be backed up; ",)
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if (dbattributes & 16):
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print("OK to install over newer; ",)
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if (dbattributes & 32):
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print("Reset after installation; ",)
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if (dbattributes & 64):
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print("No copying by PalmPilot beaming; ",)
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print(")")
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else:
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print("")
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print("File version: %d" % struct.unpack_from(b'>H', self.palmheader, 34)[0])
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dbcreation, = struct.unpack_from(b'>L', self.palmheader, 36)
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print("Creation Date: " + str(datetimefrompalmtime(dbcreation))+ (" (0x%0X)" % dbcreation))
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dbmodification, = struct.unpack_from(b'>L', self.palmheader, 40)
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print("Modification Date: " + str(datetimefrompalmtime(dbmodification))+ (" (0x%0X)" % dbmodification))
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dbbackup, = struct.unpack_from(b'>L', self.palmheader, 44)
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if dbbackup != 0:
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print("Backup Date: " + str(datetimefrompalmtime(dbbackup))+ (" (0x%0X)" % dbbackup))
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print("Modification No.: %d" % struct.unpack_from(b'>L', self.palmheader, 48)[0])
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print("App Info offset: 0x%0X" % struct.unpack_from(b'>L', self.palmheader, 52)[0])
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print("Sort Info offset: 0x%0X" % struct.unpack_from(b'>L', self.palmheader, 56)[0])
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print("Type/Creator: %s/%s" % (repr(self.palmheader[60:64]), repr(self.palmheader[64:68])))
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print("Unique seed: 0x%0X" % struct.unpack_from(b'>L', self.palmheader, 68)[0])
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expectedzero, = struct.unpack_from(b'>L', self.palmheader, 72)
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if expectedzero != 0:
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print("Should be zero but isn't: %d" % struct.unpack_from(b'>L', self.palmheader, 72)[0])
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print("Number of sections: %d" % struct.unpack_from(b'>H', self.palmheader, 76)[0])
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return
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def loadSection(self, section):
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before, after = self.sectionoffsets[section:section+2]
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return self.data[before:after]
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