%PDF-
%PDF-
Mini Shell
Mini Shell
#!/usr/bin/env python3
__license__ = 'GPL v3'
__copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
from struct import unpack_from
from calibre.ebooks.mobi.debug.headers import EXTHHeader
class ContainerHeader:
def __init__(self, data):
self.ident = data[:4]
self.record_size, self.type, self.count, self.encoding = unpack_from(b'>IHHI', data, 4)
self.encoding = {
1252 : 'cp1252',
65001: 'utf-8',
}.get(self.encoding, repr(self.encoding))
rest = list(unpack_from(b'>IIIIIIII', data, 16))
self.num_of_resource_records = rest[2]
self.num_of_non_dummy_resource_records = rest[3]
self.offset_to_href_record = rest[4]
self.unknowns1 = rest[:2]
self.unknowns2 = rest[5]
self.header_length = rest[6]
self.title_length = rest[7]
self.resources = []
self.hrefs = []
if data[48:52] == b'EXTH':
self.exth = EXTHHeader(data[48:])
self.title = data[48 + self.exth.length:][:self.title_length].decode(self.encoding)
self.is_image_container = self.exth[539] == 'application/image'
else:
self.exth = ' No EXTH header present '
self.title = ''
self.is_image_container = False
self.bytes_after_exth = data[self.header_length + self.title_length:]
self.null_bytes_after_exth = len(self.bytes_after_exth) - len(self.bytes_after_exth.replace(b'\0', b''))
def add_hrefs(self, data):
# kindlegen inserts a trailing | after the last href
self.hrefs = list(filter(None, data.decode('utf-8').split('|')))
def __str__(self):
ans = [('*'*10) + ' Container Header ' + ('*'*10)]
a = ans.append
a('Record size: %d' % self.record_size)
a('Type: %d' % self.type)
a('Total number of records in this container: %d' % self.count)
a('Encoding: %s' % self.encoding)
a('Unknowns1: %s' % self.unknowns1)
a('Num of resource records: %d' % self.num_of_resource_records)
a('Num of non-dummy resource records: %d' % self.num_of_non_dummy_resource_records)
a('Offset to href record: %d' % self.offset_to_href_record)
a('Unknowns2: %s' % self.unknowns2)
a('Header length: %d' % self.header_length)
a('Title Length: %s' % self.title_length)
a('hrefs: %s' % self.hrefs)
a('Null bytes after EXTH: %d' % self.null_bytes_after_exth)
if len(self.bytes_after_exth) != self.null_bytes_after_exth:
a('Non-null bytes present after EXTH header!!!!')
return '\n'.join(ans) + '\n\n' + str(self.exth) + '\n\n' + ('Title: %s' % self.title)
Zerion Mini Shell 1.0