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Merge LIT explosion work-state patch from office computer

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This commit is contained in:
Marshall T. Vandegrift 2008-07-15 17:37:56 -04:00
commit aead67b821
5 changed files with 1756 additions and 0 deletions
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5
src/calibre/ebooks/lit/__init__.py Normal file
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__license__ = 'GPL v3'
__copyright__ = '2008, Marshall T. Vandegrift <llasram@gmail.com>'
class LitError(Exception):
pass

5
src/calibre/ebooks/lit/maps/__init__.py Normal file
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import calibre.ebooks.maps.opf as opf
import calibre.ebooks.maps.html as html
OPF_MAP = opf.MAP
HTML_MAP = html.MAP

1008
src/calibre/ebooks/lit/maps/html.py Normal file
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74
src/calibre/ebooks/lit/maps/opf.py Normal file
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ATTRS = {
0x0001 => "href",
0x0002 => "%never-used",
0x0003 => "%guid",
0x0004 => "%minimum_level",
0x0005 => "%attr5",
0x0006 => "id",
0x0007 => "href",
0x0008 => "media-type",
0x0009 => "fallback",
0x000A => "idref",
0x000B => "xmlns:dc",
0x000C => "xmlns:oebpackage",
0x000D => "role",
0x000E => "file-as",
0x000F => "event",
0x0010 => "scheme",
0x0011 => "title",
0x0012 => "type",
0x0013 => "unique-identifier",
0x0014 => "name",
0x0015 => "content",
0x0016 => "xml:lang",
}
TAGS = [
None,
"package",
"dc:Title",
"dc:Creator",
None,
None,
None,
None,
None,
None,
None,
None,
None,
None,
None,
None,
"manifest",
"item",
"spine",
"itemref",
"metadata",
"dc-metadata",
"dc:Subject",
"dc:Description",
"dc:Publisher",
"dc:Contributor",
"dc:Date",
"dc:Type",
"dc:Format",
"dc:Identifier",
"dc:Source",
"dc:Language",
"dc:Relation",
"dc:Coverage",
"dc:Rights",
"x-metadata",
"meta",
"tours",
"tour",
"site",
"guide",
"reference",
None,
]
TAGS_ATTR = [{} for i in xrange(43)]
MAP = (TAGS, TAGS_ATTRS, ATTRS0)

664
src/calibre/ebooks/lit/reader.py Normal file
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__license__ = 'GPL v3'
__copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
'''
Support for reading the metadata from a lit file.
'''
import sys, struct, cStringIO, os
from itertools import repeat
from calibre import relpath
from calibre.ebooks.metadata import MetaInformation
from calibre.ebooks.metadata.opf import OPFReader
from calibre.ebooks.lit import LitError
from calibre.ebooks.lit.maps import OPF_MAP, HTML_MAP
def u32(bytes):
return struct.unpack('<L', bytes[:4])[0]
def u16(bytes):
return struct.unpack('<H', bytes[:2])[0]
def int32(bytes):
return struct.unpack('<l', bytes[:4])[0]
def encint(bytes, remaining):
pos, val = 0, 0
while remaining > 0:
b = ord(bytes[pos])
pos += 1
remaining -= 1
val <<= 7
val |= (b & 0x7f)
if b & 0x80 == 0: break
return val, bytes[pos:], remaining
def read_utf8_char(bytes, pos):
c = ord(bytes[pos])
mask = 0x80
if (c & mask):
elsize = 0
while c & mask:
mask >>= 1
elsize += 1
if (mask <= 1) or (mask == 0x40):
raise LitError('Invalid UTF8 character: %s' % repr(bytes[pos]))
else:
elsize = 1
if elsize > 1:
if elsize + pos > len(bytes):
raise LitError('Invalid UTF8 character: %s' % repr(bytes[pos]))
c &= (mask - 1)
for i in range(1, elsize):
b = ord(bytes[pos+i])
if (b & 0xC0) != 0x80:
raise LitError(
'Invalid UTF8 character: %s' % repr(bytes[pos:pos+i]))
c = (c << 6) | (b & 0x3F)
return unichr(c), pos+elsize
FLAG_OPENING = 1
FLAG_CLOSING = 2
FLAG_BLOCK = 4
FLAG_HEAD = 8
FLAG_ATOM = 16
XML_ENTITIES = ['&amp;', '&apos;', '&lt;', '&gt;', '&quot;']
class UnBinary(object):
def __init__(self, bin, manifest, map=OPF_MAP):
self.manifest = manifest
self.attr_map, self.tag_map, self.tag_to_attr_map = map
self.opf = map is OPF_MAP
self.bin = bin
self.buf = cStringIO.StringIO()
self.ampersands = []
self.binary_to_text()
self.raw = self.buf.getvalue().lstrip().decode('utf-8')
self.escape_ampersands()
def escape_ampersands(self):
offset = 0
for pos in self.ampersands:
test = self.raw[pos+offset:pos+offset+6]
if test.startswith('&#') and ';' in test:
continue
escape = True
for ent in XML_ENTITIES:
if test.startswith(ent):
escape = False
break
if not escape:
continue
self.raw = self.raw[:pos+offset] + '&amp;' + self.raw[pos+offset+1:]
offset += 4
def item_path(self, internal_id):
for i in self.manifest:
if i == internal_id:
return i.path
raise LitError('Could not find item %s'%(internal_id,))
def __unicode__(self):
return self.raw
def binary_to_text(self, base=0, depth=0):
tag_name = current_map = None
dynamic_tag = errors = 0
in_censorship = False
state = 'text'
index = base
flags = 0
while index < len(self.bin):
c, index = read_utf8_char(self.bin, index)
oc = ord(c)
if state == 'text':
if oc == 0:
state = 'get flags'
continue
elif c == '\v':
c = '\n'
elif c == '&':
self.ampersands.append(self.buf.tell()-1)
self.buf.write(c.encode('utf-8'))
elif state == 'get flags':
if oc == 0:
state = 'text'
continue
flags = oc
state = 'get tag'
elif state == 'get tag':
state = 'text' if oc == 0 else 'get attr'
if flags & FLAG_OPENING:
tag = oc
self.buf.write('<')
if not (flags & FLAG_CLOSING):
is_goingdown = 1
if tag == 0x8000:
state = 'get custom length'
continue
if flags & FLAG_ATOM:
raise LitError('TODO: Atoms not yet implemented')
elif tag < len(self.tag_map):
tag_name = self.tag_map[tag]
current_map = self.tag_to_attr_map[tag]
else:
dynamic_tag += 1
errors += 1
tag_name = '?'+unichr(tag)+'?'
current_map = self.tag_to_attr_map[tag]
print 'WARNING: tag %s unknown' % unichr(tag)
self.buf.write(unicode(tag_name).encode('utf-8'))
elif flags & FLAG_CLOSING:
if depth == 0:
raise LitError('Extra closing tag')
return index
elif state == 'get attr':
in_censorship = False
if oc == 0:
if not is_goingdown:
tag_name = None
dynamic_tag = 0
self.buf.write(' />')
else:
self.buf.write('>')
index = self.binary_to_text(base=index, depth=depth+1)
is_goingdown = 0
if not tag_name:
raise LitError('Tag ends before it begins.')
self.buf.write('</'+tag_name+'>')
dynamic_tag = 0
tag_name = None
state = 'text'
else:
if oc == 0x8000:
state = 'get attr length'
continue
attr = None
if oc in current_map and current_map[oc]:
attr = current_map[oc]
elif oc in self.attr_map:
attr = self.attr_map[oc]
if not attr or not isinstance(attr, basestring):
raise LitError(
'Unknown attribute %d in tag %s' % (oc, tag_name))
if attr.startswith('%'):
in_censorship = True
state = 'get value length'
continue
self.buf.write(' ' + unicode(attr).encode('utf-8') + '=')
if attr in ['href', 'src']:
state = 'get href length'
else:
state = 'get value length'
elif state == 'get value length':
if not in_censorship:
self.buf.write('"')
count = oc - 1
if count == 0:
if not in_censorship:
self.buf.write('"')
in_censorship = False
state = 'get attr'
continue
state = 'get value'
if oc == 0xffff:
continue
if count < 0 or count > (len(self.bin) - index):
raise LitError('Invalid character count %d' % count)
elif state == 'get value':
if count == 0xfffe:
if not in_censorship:
self.buf.write('%s"' % (oc - 1))
in_censorship = False
state = 'get attr'
elif count > 0:
if not in_censorship:
self.buf.write(c)
count -= 1
elif count == 0:
if not in_censorship:
self.buf.write('"')
in_censorship = False
state = 'get attr'
elif state == 'get custom length':
count = oc - 1
if count <= 0 or count > len(self.bin)-index:
raise LitError('Invalid character count %d' % count)
dynamic_tag += 1
state = 'get custom'
tag_name = ''
elif state == 'get custom':
tag_name += c
count -= 1
if count == 0:
self.buf.write(tag_name)
state = 'get attr'
elif state == 'get attr length':
count = oc - 1
if count <= 0 or count > (len(self.bin) - index):
raise LitError('Invalid character count %d' % count)
self.buf.write(' ')
state = 'get custom attr'
elif state == 'get custom attr':
self.buf.write(c)
count -= 1
if count == 0:
self.buf.write('=')
state = 'get value length'
elif state == 'get href length':
count = oc - 1
if count <= 0 or count > (len(self.bin) - index):
raise LitError('Invalid character count %d' % count)
href = ''
state = 'get href'
elif state == 'get href':
href += c
count -= 1
if count == 0:
doc, m, frag = href.partition('#')
path = self.item_path(doc)
if m and frag:
path += m + frag
self.buf.write((u'"%s"' % path).encode('utf-8'))
state = 'get attr'
return index
class ManifestItem(object):
def __init__(self, original, internal, mime_type, offset, root, state):
self.original = original
self.internal = internal
self.mime_type = mime_type
self.offset = offset
self.root = root
self.state = state
self.prefix = 'images' \
if state == 'images' else 'css' if state == 'css' else ''
self.prefix = self.prefix + os.sep if self.prefix else ''
self.path = self.prefix + self.original
def __eq__(self, other):
if hasattr(other, 'internal'):
return self.internal == other.internal
return self.internal == other
def __repr__(self):
return self.internal + u'->' + self.path
class LitFile(object):
PIECE_SIZE = 16
def magic():
def fget(self):
val = None
opos = self._stream.tell()
try:
self._stream.seek(0)
val = self._stream.read(8)
finally:
self._stream.seek(opos)
return val
return property(fget=fget)
magic = magic()
def version():
def fget(self):
val = None
opos = self._stream.tell()
try:
self._stream.seek(8)
val = u32(self._stream.read(4))
finally:
self._stream.seek(opos)
return val
return property(fget=fget)
version = version()
def hdr_len():
def fget(self):
val = None
opos = self._stream.tell()
try:
self._stream.seek(12)
val = int32(self._stream.read(4))
finally:
self._stream.seek(opos)
return val
return property(fget=fget)
hdr_len = hdr_len()
def num_pieces():
def fget(self):
val = None
opos = self._stream.tell()
try:
self._stream.seek(16)
val = int32(self._stream.read(4))
finally:
self._stream.seek(opos)
return val
return property(fget=fget)
num_pieces = num_pieces()
def sec_hdr_len():
def fget(self):
val = None
opos = self._stream.tell()
try:
self._stream.seek(20)
val = int32(self._stream.read(4))
finally:
self._stream.seek(opos)
return val
return property(fget=fget)
sec_hdr_len = sec_hdr_len()
def guid():
def fget(self):
val = None
opos = self._stream.tell()
try:
self._stream.seek(24)
val = self._stream.read(16)
finally:
self._stream.seek(opos)
return val
return property(fget=fget)
guid = guid()
def header():
def fget(self):
val = None
opos = self._stream.tell()
try:
size = self.hdr_len \
+ (self.num_pieces * self.PIECE_SIZE) \
+ self.sec_hdr_len
self._stream.seek(0)
val = self._stream.read(size)
finally:
self._stream.seek(opos)
return val
return property(fget=fget)
header = header()
def __init__(self, stream):
self._stream = stream
if self.magic != 'ITOLITLS':
raise LitError('Not a valid LIT file')
if self.version != 1:
raise LitError('Unknown LIT version %d'%(self.version,))
self.read_secondary_header()
self.read_header_pieces()
def read_secondary_header(self):
opos = self._stream.tell()
try:
self._stream.seek(self.hdr_len + self.num_pieces*self.PIECE_SIZE)
bytes = self._stream.read(self.sec_hdr_len)
offset = int32(bytes[4:])
while offset < len(bytes):
blocktype = bytes[offset:offset+4]
blockver = u32(bytes[offset+4:])
if blocktype == 'CAOL':
if blockver != 2:
raise LitError(
'Unknown CAOL block format %d' % blockver)
self.creator_id = u32(bytes[offset+12:])
self.entry_chunklen = u32(bytes[offset+20:])
self.count_chunklen = u32(bytes[offset+24:])
self.entry_unknown = u32(bytes[offset+28:])
self.count_unknown = u32(bytes[offset+32:])
offset += 48
elif blocktype == 'ITSF':
if blockver != 4:
raise LitError(
'Unknown ITSF block format %d' % blockver)
if u32(bytes[offset+4+16:]):
raise LitError('This file has a 64bit content offset')
self.content_offset = u32(bytes[offset+16:])
self.timestamp = u32(bytes[offset+24:])
self.language_id = u32(bytes[offset+28:])
offset += 48
if not hasattr(self, 'content_offset'):
raise LitError('Could not figure out the content offset')
finally:
self._stream.seek(opos)
def read_header_pieces(self):
opos = self._stream.tell()
try:
src = self.header[self.hdr_len:]
for i in range(self.num_pieces):
piece = src[i*self.PIECE_SIZE:(i+1)*self.PIECE_SIZE]
if u32(piece[4:]) != 0 or u32(piece[12:]) != 0:
raise LitError('Piece %s has 64bit value' % repr(piece))
offset, size = u32(piece), int32(piece[8:])
self._stream.seek(offset)
piece = self._stream.read(size)
if i == 0:
continue # Dont need this piece
elif i == 1:
if u32(piece[8:]) != self.entry_chunklen or \
u32(piece[12:]) != self.entry_unknown:
raise LitError('Secondary header does not match piece')
self.read_directory(piece)
elif i == 2:
if u32(piece[8:]) != self.count_chunklen or \
u32(piece[12:]) != self.count_unknown:
raise LitError('Secondary header does not match piece')
continue # No data needed from this piece
elif i == 3:
self.piece3_guid = piece
elif i == 4:
self.piece4_guid = piece
finally:
self._stream.seek(opos)
def read_directory(self, piece):
self.entries = []
if not piece.startswith('IFCM'):
raise LitError('Header piece #1 is not main directory.')
chunk_size, num_chunks = int32(piece[8:12]), int32(piece[24:28])
if (32 + chunk_size * num_chunks) != len(piece):
raise LitError('IFCM HEADER has incorrect length')
for chunk in range(num_chunks):
p = 32 + chunk * chunk_size
if piece[p:p+4] != 'AOLL':
continue
remaining = chunk_size - int32(piece[p+4:p+8]) - 48
if remaining < 0:
raise LitError('AOLL remaining count is negative')
entries = u16(piece[p+chunk_size-2:])
if entries <= 0:
# Hopefully everything will work even without a correct entries
# count
entries = (2 ** 16) - 1
piece = piece[p+48:]
i = 0
while i < entries:
if remaining <= 0: break
namelen, piece, remaining = encint(piece, remaining)
if namelen != (namelen & 0x7fffffff):
raise LitError('Directory entry had 64bit name length.')
if namelen > remaining - 3:
raise LitError('Read past end of directory chunk')
name = piece[:namelen]
piece = piece[namelen:]
section, piece, remaining = encint(piece, remaining)
offset, piece, remaining = encint(piece, remaining)
size, piece, remaining = encint(piece, remaining)
entry = DirectoryEntry(name, section, offset, size)
if name == '::DataSpace/NameList':
self.read_section_names(entry)
elif name == '/manifest':
self.read_manifest(entry)
elif name == '/meta':
self.read_meta(entry)
self.entries.append(entry)
i += 1
if not hasattr(self, 'sections'):
raise LitError('Lit file does not have a valid NameList')
if not hasattr(self, 'manifest'):
raise LitError('Lit file does not have a valid manifest')
def read_section_names(self, entry):
opos = self._stream.tell()
try:
self._stream.seek(self.content_offset + entry.offset)
raw = self._stream.read(entry.size)
if len(raw) < 4:
raise LitError('Invalid Namelist section')
pos = 4
self.num_sections = u16(raw[2:pos])
self.sections = {}
for section in range(self.num_sections):
size = u16(raw[pos:pos+2])
pos += 2
size = size*2 + 2
if pos + size > len(raw):
raise LitError('Invalid Namelist section')
self.sections[section] = raw[pos:pos+size].decode('utf-16-le')
pos += size
finally:
self._stream.seek(opos)
def read_manifest(self, entry):
opos = self._stream.tell()
try:
self.manifest = []
self._stream.seek(self.content_offset + entry.offset)
raw = self._stream.read(entry.size)
pos = 0
while pos < len(raw):
size = ord(raw[pos])
if size == 0: break
pos += 1
root = raw[pos:pos+size].decode('utf8')
pos += size
if pos >= len(raw):
raise LitError('Truncated manifest.')
for state in ['spine', 'not spine', 'css', 'images']:
num_files = int32(raw[pos:pos+4])
pos += 4
if num_files == 0: continue
i = 0
while i < num_files:
if pos+5 >= len(raw):
raise LitError('Truncated manifest.')
offset = u32(raw[pos:pos+4])
pos += 4
slen = ord(raw[pos])
pos += 1
internal = raw[pos:pos+slen].decode('utf8')
pos += slen
slen = ord(raw[pos])
pos += 1
original = raw[pos:pos+slen].decode('utf8')
pos += slen
slen = ord(raw[pos])
pos += 1
mime_type = raw[pos:pos+slen].decode('utf8')
pos += slen + 1
self.manifest.append(
ManifestItem(original, internal, mime_type,
offset, root, state))
i += 1
finally:
self._stream.seek(opos)
def read_meta(self, entry):
opos = self._stream.tell()
try:
self._stream.seek(self.content_offset + entry.offset)
raw = self._stream.read(entry.size)
xml = \
'''\
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE package
PUBLIC "+//ISBN 0-9673008-1-9//DTD OEB 1.0.1 Package//EN"
"http://openebook.org/dtds/oeb-1.0.1/oebpkg101.dtd">
'''+\
unicode(UnBinary(raw, self.manifest))
self.meta = xml
finally:
self._stream.seek(opos)
def read_image(self, internal_name):
cover_entry = None
for entry in self.entries:
if internal_name in entry.name:
cover_entry = entry
break
opos = self._stream.tell()
try:
self._stream.seek(self.content_offset + cover_entry.offset)
return self._stream.read(cover_entry.size)
finally:
self._stream.seek(opos)
def get_metadata(stream):
try:
litfile = LitFile(stream)
src = litfile.meta.encode('utf-8')
mi = OPFReader(cStringIO.StringIO(src), dir=os.getcwd())
cover_url, cover_item = mi.cover, None
if cover_url:
cover_url = relpath(cover_url, os.getcwd())
for item in litfile.manifest:
if item.path == cover_url:
cover_item = item.internal
if cover_item is not None:
ext = cover_url.rpartition('.')[-1]
if not ext:
ext = 'jpg'
else:
ext = ext.lower()
cd = litfile.read_image(cover_item)
mi.cover_data = (ext, cd) if cd else (None, None)
except:
title = stream.name if hasattr(stream, 'name') and stream.name else 'Unknown'
mi = MetaInformation(title, ['Unknown'])
return mi
def main(args=sys.argv):
if len(args) != 2:
print >>sys.stderr, _('Usage: %s file.lit')%(args[0],)
return 1
mi = get_metadata(open(args[1], 'rb'))
print unicode(mi)
if mi.cover_data[1]:
cover = os.path.abspath(os.path.splitext(os.path.basename(args[1]))[0] + '.' + mi.cover_data[0])
open(cover, 'wb').write(mi.cover_data[1])
print _('Cover saved to'), cover
return 0
if __name__ == '__main__':
sys.exit(main())