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New MOBI Output: Write a pad record to ensure the first non text record starts at a 4byte boundary

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This commit is contained in:
Kovid Goyal 2011-07-30 13:56:45 -06:00
parent ee1fdd3d0c
commit fbc770710b
1 changed files with 8 additions and 1 deletions
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9
src/calibre/ebooks/mobi/writer2/main.py
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@ -201,6 +201,7 @@ class MobiWriter(object):
self.text_length = len(text) self.text_length = len(text)
text = StringIO(text) text = StringIO(text)
nrecords = 0 nrecords = 0
records_size = 0
if self.compression != UNCOMPRESSED: if self.compression != UNCOMPRESSED:
self.oeb.logger.info(' Compressing markup content...') self.oeb.logger.info(' Compressing markup content...')
@ -214,9 +215,15 @@ class MobiWriter(object):
data += pack(b'>B', len(overlap)) data += pack(b'>B', len(overlap))
self.records.append(data) self.records.append(data)
records_size += len(data)
nrecords += 1 nrecords += 1
self.last_text_record_idx = nrecords self.last_text_record_idx = nrecords
self.first_non_text_record_idx = nrecords + 1
# Pad so that the next records starts at a 4 byte boundary
if records_size % 4 != 0:
self.records.append(b'\x00'*(records_size % 4))
self.first_non_text_record_idx += 1
def read_text_record(self, text): def read_text_record(self, text):
''' '''
@ -338,7 +345,7 @@ class MobiWriter(object):
# 0x40 - 0x43 : Offset of first non-text record # 0x40 - 0x43 : Offset of first non-text record
record0.write(pack(b'>I', record0.write(pack(b'>I',
self.last_text_record_idx + 1)) self.first_non_text_record_idx))
# 0x44 - 0x4b : title offset, title length # 0x44 - 0x4b : title offset, title length
record0.write(pack(b'>II', record0.write(pack(b'>II',