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This commit is contained in:
Kovid Goyal 2011-09-21 16:42:46 -06:00
parent bb2d522474
commit f3a774e0d3
1 changed files with 8 additions and 1 deletions
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9
src/calibre/ebooks/mobi/reader.py
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@ -144,8 +144,15 @@ class BookHeader(object):
self.codec = 'cp1252' if not user_encoding else user_encoding
log.warn('Unknown codepage %d. Assuming %s' % (self.codepage,
self.codec))
# There exists some broken DRM removal tool that removes DRM but
# leaves the DRM fields in the header yielding a header size of
# 0xF8. The actual value of max_header_length should be 0xE8 but
# it's changed to accommodate this silly tool. Hopefully that will
# not break anything else.
max_header_length = 0xF8
if (ident == 'TEXTREAD' or self.length < 0xE4 or
0xF8 < self.length or # 0xF8 is a correct MOBI header with DRM fields
self.length > max_header_length or
(try_extra_data_fix and self.length == 0xE4)):
self.extra_flags = 0
else: