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Properly decode the boundary index list in the Index Header

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Kovid Goyal 2014-03-29 13:58:58 +05:30
parent 5a42480c41
commit 9829820f5e
1 changed files with 18 additions and 5 deletions
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23
src/calibre/ebooks/mobi/debug/index.py
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@ -25,17 +25,30 @@ Elem = namedtuple('Chunk',
GuideRef = namedtuple('GuideRef', 'type title pos_fid')
INDEX_HEADER_FIELDS = INDEX_HEADER_FIELDS + ('last_index',)
INDEX_HEADER_FIELDS = INDEX_HEADER_FIELDS + ('last_index', 'tagx_block_size', 'tagx_block')
FIELD_NAMES = {'len':'Header length', 'type':'Unknown', 'gen':'Index Type (0 - normal, 2 - inflection)',
'start':'IDXT Offset', 'count':'Number of Index entries or records', 'code': 'character encoding', 'lng':'Unknown',
'total':'Total number of Index Entries in all records', 'ordt': 'ORDT Offset', 'ligt':'LIGT Offset', 'nligt':'Number of LIGT',
'ncncx':'Number of CNCX records', 'last_index':'Text of Boundary Index'}
'ncncx':'Number of CNCX records', 'last_index':'Text of Boundary Entry in every index record'}
def read_last_index(data, header):
offset = header['tagx']
offset += struct.unpack_from(b'>I', data, offset + 4)[0]
strlen = bytearray(data[offset:offset+1])[0]
header['last_index'] = data[offset+1:offset+1+strlen]
indices = []
if offset > 0:
tagx_block_size = header['tagx_block_size'] = struct.unpack_from(b'>I', data, offset + 4)[0]
header['tagx_block'] = data[offset:offset+tagx_block_size]
offset += tagx_block_size
for i in xrange(header['count']):
strlen = bytearray(data[offset:offset+1])[0]
text = data[offset+1:offset+1+strlen].decode('ascii')
offset += 1 + strlen
num = struct.unpack_from(b'>H', data, offset)[0]
offset += 2
indices.append((text, num))
else:
header['tagx_block'] = b''
header['tagx_block_size'] = 0
header['last_index'] = indices
def read_index(sections, idx, codec):
table, cncx = OrderedDict(), CNCX([], codec)