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mobi.py
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mobi.py
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from struct import unpack, pack, calcsize
from mobi_languages import LANGUAGES
from lz77 import uncompress
def LOG(*args):
pass
MOBI_HDR_FIELDS = (
("id", 16, "4s"),
("header_len", 20, "I"),
("mobi_type", 24, "I"),
("encoding", 28, "I"),
("UID", 32, "I"),
("generator_version", 36, "I"),
("reserved", 40, "40s"),
("first_nonbook_idx", 80, "I"),
("full_name_offs", 84, "I"),
("full_name_len", 88, "I"),
("locale_highbytes", 92, "H"),
("locale_country", 94, "B"),
("locale_language", 95, "B"),
("input_lang", 96, "I"),
("output_lang", 100, "I"),
("format_version", 104, "I"),
("first_image_idx", 108, "I"),
("huff/cdic_record", 112, "I"),
("huff/cdic_count", 116, "I"),
("datp_record", 120, "I"),
("datp_count", 124, "I"),
("exth_flags", 128, "I"),
("unknowni@132", 132, "32s"),
("unknown@164", 164, "I"),
("drm_offs", 168, "I"),
("drm_count", 172, "I"),
("drm_size", 176, "I"),
("drm_flags", 180, "I"),
("unknown@184", 184, "I"),
("unknown@188", 188, "I"),
("unknown@192", 192, "H"),
("last_image_record", 194, "H"),
("unknown@196", 196, "I"),
("fcis_record", 200, "I"),
("unknown@204", 204, "I"),
("flis_record", 208, "I"),
("unknown@212", 212, "I"),
("extra_data_flags", 242, "H")
)
EXTH_FMT = ">4x2I"
'''4x = "EXTH", I = hlen, I = record count'''
EXTH_RECORD_TYPES = {
1: 'drm server id',
2: 'drm commerce id',
3: 'drm ebookbase book id',
100: 'author', # list
101: 'publisher', # list
102: 'imprint',
103: 'description',
104: 'isbn', # list
105: 'subject', # list
106: 'publication date',
107: 'review',
108: 'contributor', # list
109: 'rights',
110: 'subjectcode', # list
111: 'type',
112: 'source',
113: 'asin',
114: 'version number', # int
115: 'sample', # int (or bool)?
116: 'start reading',
117: 'adult',
118: 'retail price',
119: 'retail price currency',
201: 'cover offset', # int
202: 'thumbnail offset', # int
203: 'has fake cover', # bool?
208: 'watermark',
209: 'tamper proof keys',
401: 'clipping limit', # int
402: 'publisher limit',
404: 'ttsflag',
501: 'cde type',
502: 'last update time',
503: 'updated title'
}
PRC_HDRFMT = '>H2xIHHI' # Compression,unused,Len,Count,Size,Pos
def parse_palmdb(filename):
import palm
db = palm.Database(filename)
return db
class Book:
def __init__(self, fn):
self.filename = fn
# Set some fields to defaults
self.title = fn
self.author = "??"
self.language = "??"
self.is_a_book = False
f = open(fn)
d = f.read(68)
f.close()
encodings = {
1252: 'cp1252',
65001: 'utf-8'
}
supported_types = ('BOOKMOBI', 'TEXtREAd')
self.type = d[60:68]
if self.type not in supported_types:
LOG(1, "Unsupported file type %s" % (self.type))
return None
try:
db = parse_palmdb(fn)
except:
return None
self.is_a_book = True
# now we have a better guess at the title, use it for now
self.title = db.name
self.records = db.records
rec0 = self.records[0].data
#LOG(5,repr(rec0))
if self.type == 'BOOKMOBI':
LOG(3, "This is a MOBI book")
self.mobi = {}
for field, pos, fmt in MOBI_HDR_FIELDS:
end = pos + calcsize(fmt)
if (end > len(rec0) or
("header_len" in self.mobi
and end > self.mobi["header_len"])):
continue
LOG(4, "field: %s, fmt: %s, @ [%d:%d], data: %s" % (
field, fmt, pos, end, repr(rec0[pos:end])))
(self.mobi[field], ) = unpack(">%s" % fmt, rec0[pos:end])
LOG(3, "self.mobi: %s" % repr(self.mobi))
# Get and decode the book name
if self.mobi['locale_language'] in LANGUAGES:
lang = LANGUAGES[self.mobi['locale_language']]
if self.mobi['locale_country'] == 0:
LOG(2, "Book language: %s" % lang[0][1])
self.language = "%s (%s)" % (lang[0][1], lang[0][0])
elif self.mobi['locale_country'] in lang:
country = lang[self.mobi['locale_country']]
LOG(2, "Book language is %s (%s)" % (
lang[0][1], country[1]))
self.language = "%s (%s-%s)" % (
lang[0][1],
lang[0][0],
country[0]
)
pos = self.mobi['full_name_offs']
end = pos + self.mobi['full_name_len']
self.title = rec0[pos:end].decode(encodings[self.mobi['encoding']])
LOG(2, "Book name: %s" % self.title)
if self.mobi['id'] != 'MOBI':
LOG(0, "Mobi header missing!")
return None
if (0x40 & self.mobi['exth_flags']): # check for EXTH
self.exth = parse_exth(rec0, self.mobi['header_len'] + 16)
LOG(3, "EXTH header: %s" % repr(self.exth))
if 'author' in self.exth:
self.author = ' & '.join(self.exth['author'])
else:
self.author = "n/a"
self.rawdata = d
if (('updated title' in self.exth) and
(type(self.exth['updated title']) is str)):
self.title = ' '.join(self.exth['updated title'])
elif self.type == 'TEXtREAd':
LOG(2, "This is an older MOBI book")
self.rawdata = d
compression, data_len, rec_count, rec_size, pos = unpack(
PRC_HDRFMT, rec0[:calcsize(PRC_HDRFMT)])
LOG(3, "compression %d, data_len %d, rec_count %d, rec_size %d" %
(compression, data_len, rec_count, rec_size))
if compression == 2:
data = uncompress(self.records[1].data)
else:
data = self.records[1].data
from BeautifulSoup import BeautifulSoup
soup = BeautifulSoup(data)
self.metadata = soup.fetch("dc-metadata")
try:
self.title = soup.fetch("dc:title")[0].getText()
self.author = soup.fetch("dc:creator")[0].getText()
self.language = soup.fetch("dc:language")[0].getText()
except:
self.title, self.author, self.language = ("Unknown", "Unknown",
"en-us")
def to_html(self):
last_idx = (
self.mobi['first_image_idx'] if 'mobi' in self.__dict__ else -1)
return ''.join([uncompress(x.data) for x in self.records[1:last_idx]])
def parse_exth(data, pos):
ret = {}
n = 0
if (pos != data.find('EXTH')):
LOG(0, "EXTH header not found where it should be @%d" % pos)
return None
else:
end = pos + calcsize(EXTH_FMT)
(hlen, count) = unpack(EXTH_FMT, data[pos:end])
LOG(4, "pos: %d, EXTH header len: %d, record count: %d" % (
pos, hlen, count))
pos = end
while n < count:
end = pos + calcsize(">2I")
t, l = unpack(">2I", data[pos:end])
v = data[end:pos + l]
if l - 8 == 4:
v = unpack(">I", v)[0]
if t in EXTH_RECORD_TYPES:
rec = EXTH_RECORD_TYPES[t]
LOG(4, "EXTH record '%s' @%d+%d: '%s'" % (
rec, pos, l - 8, v))
if rec not in ret:
ret[rec] = [v]
else:
ret[rec].append(v)
else:
LOG(4, "Found an unknown EXTH record type %d @%d+%d: '%s'" %
(t, pos, l - 8, repr(v)))
pos += l
n += 1
return ret