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Align blocks in the indexing records

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This commit is contained in:
Kovid Goyal 2009-05-30 17:16:00 -07:00
parent 84e0dac816
commit 597fd045a9
1 changed files with 14 additions and 4 deletions
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18
src/calibre/ebooks/mobi/writer.py
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@ -97,6 +97,14 @@ def decint(value, direction):
bytes[-1] |= 0x80
return ''.join(chr(b) for b in reversed(bytes))
def align_block(raw, multiple=4, pad='\0'):
l = len(raw)
extra = l % multiple
if extra == 0: return raw
return raw + pad*(multiple - extra)
def rescale_image(data, maxsizeb, dimen=None):
image = Image.open(StringIO(data))
format = image.format
@ -484,7 +492,8 @@ class MobiWriter(object):
last_name = "%4d"%c
c += 1
return indxt.getvalue(), c, indices.getvalue(), last_index, last_name
return align_block(indxt.getvalue()), c, \
align_block(indices.getvalue()), last_index, last_name
def _generate_index(self):
@ -521,12 +530,13 @@ class MobiWriter(object):
indx1 = indx1.getvalue()
idxt0 = chr(len(last_name)) + last_name + pack('>H', last_index)
idxt0 = align_block(idxt0)
indx0 = StringIO()
tagx = TAGX['periodical' if self.opts.mobi_periodical else 'chapter']
tagx = 'TAGX' + pack('>I', 8 + len(tagx)) + tagx
tagx = align_block('TAGX' + pack('>I', 8 + len(tagx)) + tagx)
indx0_indices_pos = 0xc0 + len(tagx) + len(idxt0)
indx0_indices = 'IDXT' + pack('>H', 0xc0 + len(tagx))
indx0_indices = align_block('IDXT' + pack('>H', 0xc0 + len(tagx)))
# Generate record header
header = StringIO()
@ -622,7 +632,7 @@ class MobiWriter(object):
for child in toc.iter():
add_node(child, 'chapter')
return ctoc.getvalue()
return align_block(ctoc.getvalue())
def _generate_images(self):
self._oeb.logger.info('Serializing images...')