def create_index_record(self, secondary=False): # {{{
header_length = 192
buf = io.BytesIO()
indices = list(
SecondaryIndexEntry.entries()) if secondary else self.indices
# Write index entries
offsets = []
for i in indices:
offsets.append(buf.tell())
buf.write(i.bytestring)
index_block = align_block(buf.getvalue())
# Write offsets to index entries as an IDXT block
idxt_block = b'IDXT'
buf.seek(0), buf.truncate(0)
for offset in offsets:
buf.write(pack(b'>H', header_length + offset))
idxt_block = align_block(idxt_block + buf.getvalue())
body = index_block + idxt_block
header = b'INDX'
buf.seek(0), buf.truncate(0)
buf.write(pack(b'>I', header_length))
buf.write(b'\0' * 4) # Unknown
buf.write(pack(b'>I', 1)) # Header type? Or index record number?
buf.write(b'\0' * 4) # Unknown
# IDXT block offset
buf.write(pack(b'>I', header_length + len(index_block)))
# Number of index entries
buf.write(pack(b'>I', len(offsets)))
# Unknown
buf.write(b'\xff' * 8)
# Unknown
buf.write(b'\0' * 156)
header += buf.getvalue()
ans = header + body
if len(ans) > 0x10000:
raise ValueError('Too many entries (%d) in the TOC' % len(offsets))
return ans
def create_header(self, secondary=False): # {{{
buf = io.BytesIO()
if secondary:
tagx_block = TAGX().secondary
else:
tagx_block = (TAGX().periodical if self.is_periodical else
TAGX().flat_book)
header_length = 192
# Ident 0 - 4
buf.write(b'INDX')
# Header length 4 - 8
buf.write(pack(b'>I', header_length))
# Unknown 8-16
buf.write(b'\0'*8)
# Index type: 0 - normal, 2 - inflection 16 - 20
buf.write(pack(b'>I', 2))
# IDXT offset 20-24
buf.write(pack(b'>I', 0)) # Filled in later
# Number of index records 24-28
buf.write(pack(b'>I', 1 if secondary else len(self.records)))
# Index Encoding 28-32
buf.write(pack(b'>I', 65001)) # utf-8
# Unknown 32-36
buf.write(b'\xff'*4)
# Number of index entries 36-40
indices = list(SecondaryIndexEntry.entries()) if secondary else self.indices
buf.write(pack(b'>I', len(indices)))
# ORDT offset 40-44
buf.write(pack(b'>I', 0))
# LIGT offset 44-48
buf.write(pack(b'>I', 0))
# Number of LIGT entries 48-52
buf.write(pack(b'>I', 0))
# Number of CNCX records 52-56
buf.write(pack(b'>I', 0 if secondary else len(self.cncx.records)))
# Unknown 56-180
buf.write(b'\0'*124)
# TAGX offset 180-184
buf.write(pack(b'>I', header_length))
# Unknown 184-192
buf.write(b'\0'*8)
# TAGX block
buf.write(tagx_block)
num = len(indices)
# The index of the last entry in the NCX
idx = indices[-1].index
if isinstance(idx, numbers.Integral):
idx = encode_number_as_hex(idx)
else:
idx = idx.encode('ascii')
idx = (bytes(bytearray([len(idx)]))) + idx
buf.write(idx)
# The number of entries in the NCX
buf.write(pack(b'>H', num))
# Padding
pad = (4 - (buf.tell()%4))%4
if pad:
buf.write(b'\0'*pad)
idxt_offset = buf.tell()
buf.write(b'IDXT')
buf.write(pack(b'>H', header_length + len(tagx_block)))
buf.write(b'\0')
buf.seek(20)
buf.write(pack(b'>I', idxt_offset))
return align_block(buf.getvalue())
def generate_record0(self): # MOBI header {{{
metadata = self.oeb.metadata
bt = 0x002
if self.primary_index_record_idx is not None:
if False and self.indexer.is_flat_periodical:
# Disabled as setting this to 0x102 causes the Kindle to not
# auto archive the issues
bt = 0x102
elif self.indexer.is_periodical:
# If you change this, remember to change the cdetype in the EXTH
# header as well
bt = 0x103 if self.indexer.is_flat_periodical else 0x101
from ebook_converter.ebooks.mobi.writer8.exth import build_exth
exth = build_exth(metadata,
prefer_author_sort=self.opts.prefer_author_sort,
is_periodical=self.is_periodical,
share_not_sync=self.opts.share_not_sync,
cover_offset=self.cover_offset,
thumbnail_offset=self.thumbnail_offset,
start_offset=self.serializer.start_offset,
mobi_doctype=bt)
first_image_record = None
if self.resources:
used_images = self.serializer.used_images
first_image_record = len(self.records)
self.resources.serialize(self.records, used_images)
last_content_record = len(self.records) - 1
# FCIS/FLIS (Seems to serve no purpose)
flis_number = len(self.records)
self.records.append(FLIS)
fcis_number = len(self.records)
self.records.append(fcis(self.text_length))
# EOF record
self.records.append(b'\xE9\x8E\x0D\x0A')
record0 = io.BytesIO()
# The MOBI Header
record0.write(
pack(
b'>HHIHHHH',
self.compression, # compression type # compression type
0, # Unused
self.text_length, # Text length
self.
last_text_record_idx, # Number of text records or last tr idx
RECORD_SIZE, # Text record size
0, # Unused
0 # Unused
)) # 0 - 15 (0x0 - 0xf)
uid = random.randint(0, 0xffffffff)
title = normalize(str(metadata.title[0])).encode('utf-8')
# 0x0 - 0x3
record0.write(b'MOBI')
# 0x4 - 0x7 : Length of header
# 0x8 - 0x11 : MOBI type
# type meaning
# 0x002 MOBI book (chapter - chapter navigation)
# 0x101 News - Hierarchical navigation with sections and articles
# 0x102 News feed - Flat navigation
# 0x103 News magazine - same as 0x101
# 0xC - 0xF : Text encoding (65001 is utf-8)
# 0x10 - 0x13 : UID
# 0x14 - 0x17 : Generator version
record0.write(pack(b'>IIIII', 0xe8, bt, 65001, uid, 6))
# 0x18 - 0x1f : Unknown
record0.write(b'\xff' * 8)
# 0x20 - 0x23 : Secondary index record
sir = 0xffffffff
if (self.primary_index_record_idx is not None
and self.indexer.secondary_record_offset is not None):
sir = (self.primary_index_record_idx +
self.indexer.secondary_record_offset)
record0.write(pack(b'>I', sir))
# 0x24 - 0x3f : Unknown
record0.write(b'\xff' * 28)
# 0x40 - 0x43 : Offset of first non-text record
record0.write(pack(b'>I', self.first_non_text_record_idx))
# 0x44 - 0x4b : title offset, title length
record0.write(pack(b'>II', 0xe8 + 16 + len(exth), len(title)))
# 0x4c - 0x4f : Language specifier
record0.write(iana2mobi(str(metadata.language[0])))
# 0x50 - 0x57 : Input language and Output language
record0.write(b'\0' * 8)
# 0x58 - 0x5b : Format version
# 0x5c - 0x5f : First image record number
record0.write(
pack(
b'>II', 6, first_image_record
if first_image_record else len(self.records)))
# 0x60 - 0x63 : First HUFF/CDIC record number
# 0x64 - 0x67 : Number of HUFF/CDIC records
# 0x68 - 0x6b : First DATP record number
# 0x6c - 0x6f : Number of DATP records
record0.write(b'\0' * 16)
# 0x70 - 0x73 : EXTH flags
# Bit 6 (0b1000000) being set indicates the presence of an EXTH header
# Bit 12 being set indicates the presence of embedded fonts
# The purpose of the other bits is unknown
exth_flags = 0b1010000
if self.is_periodical:
exth_flags |= 0b1000
if self.resources.has_fonts:
exth_flags |= 0b1000000000000
record0.write(pack(b'>I', exth_flags))
# 0x74 - 0x93 : Unknown
record0.write(b'\0' * 32)
# 0x94 - 0x97 : DRM offset
# 0x98 - 0x9b : DRM count
# 0x9c - 0x9f : DRM size
# 0xa0 - 0xa3 : DRM flags
record0.write(pack(b'>IIII', 0xffffffff, 0xffffffff, 0, 0))
# 0xa4 - 0xaf : Unknown
record0.write(b'\0' * 12)
# 0xb0 - 0xb1 : First content record number
# 0xb2 - 0xb3 : last content record number
# (Includes Image, DATP, HUFF, DRM)
record0.write(pack(b'>HH', 1, last_content_record))
# 0xb4 - 0xb7 : Unknown
record0.write(b'\0\0\0\x01')
# 0xb8 - 0xbb : FCIS record number
record0.write(pack(b'>I', fcis_number))
# 0xbc - 0xbf : Unknown (FCIS record count?)
record0.write(pack(b'>I', 1))
# 0xc0 - 0xc3 : FLIS record number
record0.write(pack(b'>I', flis_number))
# 0xc4 - 0xc7 : Unknown (FLIS record count?)
record0.write(pack(b'>I', 1))
# 0xc8 - 0xcf : Unknown
record0.write(b'\0' * 8)
# 0xd0 - 0xdf : Unknown
record0.write(pack(b'>IIII', 0xffffffff, 0, 0xffffffff, 0xffffffff))
# 0xe0 - 0xe3 : Extra record data
# Extra record data flags:
# - 0b1 : <extra multibyte bytes><size>
# - 0b10 : <TBS indexing description of this HTML record><size>
# - 0b100: <uncrossable breaks><size>
# Setting bit 2 (0x2) disables <guide><reference type="start"> functionality
extra_data_flags = 0b1 # Has multibyte overlap bytes
if self.primary_index_record_idx is not None:
extra_data_flags |= 0b10
if WRITE_UNCROSSABLE_BREAKS:
extra_data_flags |= 0b100
record0.write(pack(b'>I', extra_data_flags))
# 0xe4 - 0xe7 : Primary index record
record0.write(
pack(
b'>I', 0xffffffff if self.primary_index_record_idx is None else
self.primary_index_record_idx))
record0.write(exth)
record0.write(title)
record0 = record0.getvalue()
# Add some buffer so that Amazon can add encryption information if this
# MOBI is submitted for publication
record0 += (b'\0' * (1024 * 8))
self.records[0] = align_block(record0)