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MOBI Input: Warn about corrupted trailing data entries, instead of aborting. Getting some, even partially corrupted text is better than no text. See #1521830 (Calibre will not open or convert good mobi file)

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Kovid Goyal 2015-12-02 09:31:29 +05:30
parent 1915bb64cd
commit 3df3d5423a
1 changed files with 11 additions and 1 deletions
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12
src/calibre/ebooks/mobi/reader/mobi6.py
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@ -38,6 +38,7 @@ class MobiReader(object):
self.log = log self.log = log
self.debug = debug self.debug = debug
self.embedded_mi = None self.embedded_mi = None
self.warned_about_trailing_entry_corruption = False
self.base_css_rules = textwrap.dedent(''' self.base_css_rules = textwrap.dedent('''
body { text-align: justify } body { text-align: justify }
@ -740,12 +741,21 @@ class MobiReader(object):
flags = self.book_header.extra_flags >> 1 flags = self.book_header.extra_flags >> 1
while flags: while flags:
if flags & 1: if flags & 1:
num += sizeof_trailing_entry(data, size - num) try:
num += sizeof_trailing_entry(data, size - num)
except IndexError:
self.warn_about_trailing_entry_corruption()
return 0
flags >>= 1 flags >>= 1
if self.book_header.extra_flags & 1: if self.book_header.extra_flags & 1:
num += (ord(data[size - num - 1]) & 0x3) + 1 num += (ord(data[size - num - 1]) & 0x3) + 1
return num return num
def warn_about_trailing_entry_corruption(self):
if not self.warned_about_trailing_entry_corruption:
self.warned_about_trailing_entry_corruption = True
self.log.warn('The trailing data entries in this MOBI file are corrupted, you might see corrupted text in the output')
def text_section(self, index): def text_section(self, index):
data = self.sections[index][0] data = self.sections[index][0]
trail_size = self.sizeof_trailing_entries(data) trail_size = self.sizeof_trailing_entries(data)