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Fix #1045: Recover from decompression errors, skipping bad chunks.

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This commit is contained in:
Marshall T. Vandegrift 2008-11-18 20:15:32 -05:00
parent a91fa52351
commit a18e35cfec
1 changed files with 12 additions and 3 deletions
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9
src/calibre/ebooks/lit/reader.py
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@ -771,15 +771,21 @@ class LitReader(object):
raise("Reset table entry out of bounds") raise("Reset table entry out of bounds")
if bytes_remaining >= window_bytes: if bytes_remaining >= window_bytes:
lzx.reset() lzx.reset()
try:
result.append( result.append(
lzx.decompress(content[base:size], window_bytes)) lzx.decompress(content[base:size], window_bytes))
except lzx.LzxError:
self._warn("LZX decompression error; skipping chunk")
bytes_remaining -= window_bytes bytes_remaining -= window_bytes
base = size base = size
accum += int32(reset_table[RESET_INTERVAL:]) accum += int32(reset_table[RESET_INTERVAL:])
ofs_entry += 8 ofs_entry += 8
if bytes_remaining < window_bytes and bytes_remaining > 0: if bytes_remaining < window_bytes and bytes_remaining > 0:
lzx.reset() lzx.reset()
try:
result.append(lzx.decompress(content[base:], bytes_remaining)) result.append(lzx.decompress(content[base:], bytes_remaining))
except lzx.LzxError:
self._warn("LZX decompression error; skipping chunk")
bytes_remaining = 0 bytes_remaining = 0
if bytes_remaining > 0: if bytes_remaining > 0:
raise LitError("Failed to completely decompress section") raise LitError("Failed to completely decompress section")
@ -826,6 +832,9 @@ class LitReader(object):
if not os.path.isdir(dir): if not os.path.isdir(dir):
os.makedirs(dir) os.makedirs(dir)
def _warn(self, msg):
print "WARNING: %s" % (msg,)
def option_parser(): def option_parser():
from calibre.utils.config import OptionParser from calibre.utils.config import OptionParser
parser = OptionParser(usage=_('%prog [options] LITFILE')) parser = OptionParser(usage=_('%prog [options] LITFILE'))