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MOBI Output: Fix handling of flag bits

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This commit is contained in:
Kovid Goyal 2009-07-21 10:01:39 -06:00
parent 07d7464a4d
commit 9887bba463
1 changed files with 10 additions and 23 deletions
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33
src/calibre/ebooks/mobi/writer.py
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@ -1671,6 +1671,8 @@ class MobiWriter(object):
header.write(pack('>I', 0))
# 0x10 - 0x13 : Generator ID
# This value may impact the position of flagBits written in
# write_article_node(). Change with caution.
header.write(pack('>I', 6))
# 0x14 - 0x17 : IDXT offset
@ -2065,34 +2067,19 @@ class MobiWriter(object):
indxt.write(chr(len(name)) + name) # Write the name
indxt.write(INDXT['article']) # entryType [0x0F | 0xDF | 0xFF | 0x3F]
# This test may be false if author was post-fixed?
hasAuthor = True if self._ctoc_map[index]['authorOffset'] else False
hasDescription = True if self._ctoc_map[index]['descriptionOffset'] else False
initialOffset = offset
if hasAuthor :
if offset < 0x4000 :
# Set bit 17
offset += 0x00010000
else :
# Set bit 24
offset += 0x00800000
if hasDescription :
if initialOffset < 0x4000 :
# Set bit 16
offset += 0x00008000
else :
# Set bit 23
offset += 0x00400000
# If we didn't set any flags, write an extra zero in the stream
# Seems unnecessary, but matching Mobigen
if initialOffset == offset:
indxt.write(chr(0))
# flagBits may be dependent upon the generatorID written at 0x10 in generate_index().
# in INDX0. Mobigen uses a generatorID of 2 and writes these bits at positions 1 & 2;
# calibre uses a generatorID of 6 and writes the bits at positions 2 & 3.
flagBits = 0
if hasAuthor : flagBits |= 0x4
if hasDescription : flagBits |= 0x2
indxt.write(pack('>B',flagBits)) # Author/description flags
indxt.write(decint(offset, DECINT_FORWARD)) # offset
indxt.write(decint(length, DECINT_FORWARD)) # length
indxt.write(decint(self._ctoc_map[index]['titleOffset'], DECINT_FORWARD)) # vwi title offset in CNCX