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MOBI metadata:Fix regression that broke setting of titles in some MOBI files

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Kovid Goyal 2010-02-07 12:52:21 -07:00
parent a1365513dd
commit d9c8bbdc39
1 changed files with 12 additions and 5 deletions
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17
src/calibre/ebooks/metadata/mobi.py
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@ -181,11 +181,11 @@ def patchSection(self, section, new):
off = self.pdbrecords[section][0]
self.patch(off, new)
def create_exth(self, exth=None):
def create_exth(self, new_title=None, exth=None):
# Add an EXTH block to record 0, rewrite the stream
# self.hexdump(self.record0)
# Fetch the title
# 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])
@ -207,14 +207,21 @@ def create_exth(self, exth=None):
exth = ['EXTH', pack('>II', 12, 0), pad]
exth = ''.join(exth)
# Update title_offset
# Update title_offset, title_len if new_title
self.record0[0x54:0x58] = pack('>L', 0x10 + mobi_header_length + len(exth))
if new_title:
self.record0[0x58:0x5c] = pack('>L', len(new_title))
# Create an updated Record0
new_record0 = StringIO()
new_record0.write(self.record0[:0x10 + mobi_header_length])
new_record0.write(exth)
new_record0.write(title_in_file)
if new_title:
#new_record0.write(new_title.encode(self.codec, 'replace'))
new_title = (new_title or _('Unknown')).encode(self.codec, 'replace')
new_record0.write(new_title)
else:
new_record0.write(title_in_file)
# Pad to a 4-byte boundary
trail = len(new_record0.getvalue()) % 4
@ -332,7 +339,7 @@ def update(self, mi):
raise MobiError('No existing EXTH record. Cannot update metadata.')
self.record0[92:96] = iana2mobi(mi.language)
self.create_exth(exth)
self.create_exth(exth=exth, new_title=mi.title)
# Fetch updated timestamp, cover_record, thumbnail_record
self.fetchEXTHFields()