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MOBI metadata: Gracefully refuse to set metadata on invalid MOBI files

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Kovid Goyal 2010-02-20 16:11:14 -07:00
commit 374badc1ba
1 changed files with 5 additions and 0 deletions
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src/calibre/ebooks/metadata/mobi.py
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@ -97,9 +97,14 @@ class MetadataUpdater(object):
self.nrecs, = unpack('>H', data[76:78]) self.nrecs, = unpack('>H', data[76:78])
record0 = self.record0 = self.record(0) record0 = self.record0 = self.record(0)
mobi_header_length, = unpack('>I', record0[0x14:0x18])
if not mobi_header_length:
raise MobiError("Non-standard file format. Try 'Convert E-Books' with MOBI as Input and Output formats.")
self.encryption_type, = unpack('>H', record0[12:14]) self.encryption_type, = unpack('>H', record0[12:14])
codepage, = unpack('>I', record0[28:32]) codepage, = unpack('>I', record0[28:32])
self.codec = 'utf-8' if codepage == 65001 else 'cp1252' self.codec = 'utf-8' if codepage == 65001 else 'cp1252'
image_base, = unpack('>I', record0[108:112]) image_base, = unpack('>I', record0[108:112])
flags, = self.flags, = unpack('>I', record0[128:132]) flags, = self.flags, = unpack('>I', record0[128:132])
have_exth = self.have_exth = (flags & 0x40) != 0 have_exth = self.have_exth = (flags & 0x40) != 0