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GwR fix for unindexed TPZ files #2

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This commit is contained in:
GRiker 2010-03-24 03:23:12 -07:00
parent 4a3ebab22e
commit a00acf999e
1 changed files with 18 additions and 15 deletions
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33
src/calibre/ebooks/metadata/topaz.py
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@ -88,7 +88,7 @@ class MetadataUpdater(object):
self.header_records, consumed = self.decode_vwi(self.data[offset:offset+4])
offset += consumed
self.topaz_headers = self.get_headers(offset)
self.topaz_headers, self.th_seq = self.get_headers(offset)
# First integrity test - metadata header
if not 'metadata' in self.topaz_headers:
@ -158,6 +158,8 @@ class MetadataUpdater(object):
if value == 0:
if multi_byte:
bytes.append(b|0x80)
if bytes[-1] == 0xFF:
bytes.append(0x80)
if len(bytes) == 4:
return pack('>BBBB',bytes[3],bytes[2],bytes[1],bytes[0]).decode('iso-8859-1')
elif len(bytes) == 3:
@ -196,8 +198,9 @@ class MetadataUpdater(object):
return dks.getvalue().encode('iso-8859-1')
def get_headers(self, offset):
# Build a dict of topaz_header records
# Build a dict of topaz_header records, list of order
topaz_headers = {}
th_seq = []
for x in range(self.header_records):
offset += 1
taglen, consumed = self.decode_vwi(self.data[offset:offset+4])
@ -216,10 +219,11 @@ class MetadataUpdater(object):
offset += consumed
blocks[val] = dict(offset=hdr_offset,len_uncomp=len_uncomp,len_comp=len_comp)
topaz_headers[tag] = dict(blocks=blocks)
th_seq.append(tag)
self.eoth = self.data[offset]
offset += 1
self.base = offset
return topaz_headers
return topaz_headers, th_seq
def generate_metadata_stream(self):
ms = StringIO.StringIO()
@ -229,7 +233,8 @@ class MetadataUpdater(object):
ms.write(chr(len(self.metadata)))
# Add the metadata fields.
for tag in self.metadata:
#for tag in self.metadata:
for tag in self.md_seq:
ms.write(self.encode_vwi(len(tag)).encode('iso-8859-1'))
ms.write(tag)
ms.write(self.encode_vwi(len(self.metadata[tag])).encode('iso-8859-1'))
@ -256,6 +261,7 @@ class MetadataUpdater(object):
#print "self.md_header: %s" % self.md_header
self.metadata = {}
self.md_seq = []
for x in range(self.md_header['num_recs']):
taglen, consumed = self.decode_vwi(self.data[offset:offset+4])
offset += consumed
@ -266,16 +272,10 @@ class MetadataUpdater(object):
metadata = self.data[offset:offset + md_len]
offset += md_len
self.metadata[tag] = metadata
self.md_seq.append(tag)
def regenerate_headers(self, updated_md_len):
headers = {}
for tag in self.topaz_headers:
if self.topaz_headers[tag]['blocks']:
headers[tag] = self.topaz_headers[tag]['blocks'][0]['offset']
else:
headers[tag] = None
original_md_len = self.topaz_headers['metadata']['blocks'][0]['len_uncomp']
original_md_offset = self.topaz_headers['metadata']['blocks'][0]['offset']
delta = updated_md_len - original_md_len
@ -285,7 +285,7 @@ class MetadataUpdater(object):
ths.write(self.data[:5])
# Rewrite the offsets for hdr_offsets > metadata offset
for tag in headers.keys():
for tag in self.th_seq:
ths.write('c')
ths.write(self.encode_vwi(len(tag)))
ths.write(tag)
@ -330,12 +330,15 @@ class MetadataUpdater(object):
self.metadata['Title'] = mi.title.encode('utf-8')
updated_metadata = self.generate_metadata_stream()
head = self.regenerate_headers(len(updated_metadata))
# Skip tag_len, tag, extra
prefix = len('metadata') + 2
um_buf_len = len(updated_metadata) - prefix
head = self.regenerate_headers(um_buf_len)
# Chunk1: self.base -> original metadata start
# Chunk2: original metadata end -> eof
chunk1 = self.data[self.base:self.original_md_start]
chunk2 = self.data[self.original_md_start + self.original_md_len:]
chunk2 = self.data[prefix + self.original_md_start + self.original_md_len:]
self.stream.seek(0)
self.stream.truncate(0)
@ -366,7 +369,7 @@ if __name__ == '__main__':
data = open(sys.argv[1], 'rb')
stream = cStringIO.StringIO()
stream.write(data.read())
mi = MetaInformation(title="A Marvelously Long Title", authors=['Riker, Gregory; Riker, Charles'])
mi = MetaInformation(title="Updated Title", authors=['Author, Random'])
set_metadata(stream, mi)
# Write the result