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fix exth bug when no exth present

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This commit is contained in:
GRiker 2010-02-11 11:12:05 -07:00
parent b817c151b5
commit ebdf1e0558
1 changed files with 7 additions and 9 deletions
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16
src/calibre/ebooks/metadata/mobi.py
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@ -17,8 +17,6 @@ from calibre.ebooks.mobi import MobiError
from calibre.ebooks.mobi.writer import rescale_image, MAX_THUMB_DIMEN
from calibre.ebooks.mobi.langcodes import iana2mobi
import struct
class StreamSlicer(object):
def __init__(self, stream, start=0, stop=None):
@ -110,9 +108,9 @@ class MetadataUpdater(object):
self.original_exth_records = {}
if not have_exth:
self.create_exth()
else:
# Fetch timestamp, cover_record, thumbnail_record
self.fetchEXTHFields()
self.have_exth = True
# Fetch timestamp, cover_record, thumbnail_record
self.fetchEXTHFields()
def fetchEXTHFields(self):
stream = self.stream
@ -191,9 +189,9 @@ class MetadataUpdater(object):
# self.hexdump(self.record0)
# Fetch the existing title
title_offset, = struct.unpack('>L', self.record0[0x54:0x58])
title_length, = struct.unpack('>L', self.record0[0x58:0x5c])
title_in_file, = struct.unpack('%ds' % (title_length), self.record0[title_offset:title_offset + title_length])
title_offset, = unpack('>L', self.record0[0x54:0x58])
title_length, = unpack('>L', self.record0[0x58:0x5c])
title_in_file, = unpack('%ds' % (title_length), self.record0[title_offset:title_offset + title_length])
# Adjust length to accommodate PrimaryINDX if necessary
mobi_header_length, = unpack('>L', self.record0[0x14:0x18])
@ -256,7 +254,7 @@ class MetadataUpdater(object):
def get_pdbrecords(self):
pdbrecords = []
for i in xrange(self.nrecs):
offset, a1,a2,a3,a4 = struct.unpack('>LBBBB', self.data[78+i*8:78+i*8+8])
offset, a1,a2,a3,a4 = unpack('>LBBBB', self.data[78+i*8:78+i*8+8])
flags, val = a1, a2<<16|a3<<8|a4
pdbrecords.append( [offset, flags, val] )
return pdbrecords