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word.py
376 lines (349 loc) · 12.5 KB
/
word.py
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#! /usr/bin/env python3
from OleFileIO_PL import OleFileIO
from struct import Struct
from io import SEEK_SET, SEEK_CUR, SEEK_END
from io import BufferedIOBase, UnsupportedOperation
from shorthand import bitmask
from io import TextIOWrapper, BytesIO, StringIO
from shutil import copyfileobj
from collections.abc import Sequence
from sys import stdout, stderr
import csv
class Subfile(BufferedIOBase):
def readable(self):
return True
def __init__(self, parent, size):
self._parent = parent
self._remaining = size
self._start = self._parent.tell()
self._offset = 0
def read(self, size=-1):
if size not in range(self._remaining) or size is None:
size = self._remaining
result = self._parent.read(size)
self._remaining -= len(result)
self._offset += len(result)
if len(result) < size:
raise EOFError("Truncated read")
return result
read1 = read
def tell(self):
return self._offset
def seek(self, offset, base=SEEK_SET):
if base == SEEK_END:
offset += self._remaining
if base == SEEK_SET:
offset -= self._offset
if not -self._offset <= offset <= self._remaining:
raise EOFError("Seek out of range")
self._parent.seek(self._start + self._offset + offset)
self._remaining -= offset
self._offset += offset
return self._offset
unsigned2 = Struct("<H")
signed2 = Struct("<h")
unsigned4 = Struct("<L")
FibBase = Struct("<"
"H" # wIdent
"H" # nFib
"2x"
"H" # lid
"H" # pnNext
"BB" # Bitfields
"H" # nFibBack
"L" # lKey
"B" # envr
"B" # Bitfields
"2x 2x 4x 4x"
)
WORD_BINARY_FILE = 0xA5EC
WHICH_TBL_STM_BIT = 1
FibRgFcLcb97 = Struct("<"
"104x"
"LL" # fcPlcfBtePapx, lcbPlcfBtePapx
"152x"
"LL" # fcClx, lcbClx
)
Pcd = Struct("<" # Piece descriptor
"H" # Bitfields
"L" # fc
"H" # prm
)
FC_MASK = bitmask(30)
COMPRESSED_BIT = 30
PN_MASK = bitmask(22)
SGC_BIT = 10
SGC_MASK = bitmask(3)
PARAGRAPH = 1
TABLE = 5
SPRA_BIT = 13
SPRA_MASK = bitmask(3)
PROP_MASK = bitmask(9 + 1 + 3)
sprmPChgTabs = 0x0615
sprmPFInTable = 0x0416
sprmPFTtp = 0x0417
sprmPHugePapx = 0x0646
sprmTDefTable = 0x1608
SPRA_SIZES = {0: 1, 1: 1, 2: 2, 3: 4, 4: 2, 5: 2, 7: 3}
class Pieces(Sequence):
def __init__(self, doc, table, fcClx, lcbClx):
self._doc = doc
table.seek(fcClx)
self._subfile = Subfile(table, lcbClx)
while True:
clxt = self._subfile.read(1)
if clxt != b"\x01":
break
[cbGrpprl] = signed2.unpack(self._subfile.read(2))
assert cbGrpprl >= 0
self._subfile.seek(cbGrpprl, SEEK_CUR)
assert clxt == b"\x02"
[lcb] = unsigned4.unpack(self._subfile.read(4))
assert lcb >= 4
[self._n, remainder] = divmod(lcb - 4, 4 + Pcd.size)
assert not remainder
self._aCP = self._subfile.tell()
self._aPcd = self._aCP + (self._n + 1) * 4
def __len__(self):
return self._n
def __getitem__(self, i):
i = range(self._n)[i]
self._subfile.seek(self._aCP + i * 4)
[[cp], [next_cp]] = unsigned4.iter_unpack(self._subfile.read(4 * 2))
assert next_cp > cp
self._subfile.seek(self._aPcd + i * Pcd.size)
[_, fc, prm] = Pcd.unpack(self._subfile.read(Pcd.size))
assert prm == 0x0000
size = next_cp - cp
fCompressed = fc >> COMPRESSED_BIT & 1
fc &= FC_MASK
return Piece(self._doc, size, fCompressed, fc)
class Piece:
def __init__(self, doc, size, fCompressed, fc):
self._doc = doc
self._decoder = Cp1252Decoder if fCompressed else Utf16Decoder
self.code_size = self._decoder.code_size
self.bytes_remaining = size * self.code_size
[self.byte_offset, remainder] = divmod(fc, 2 // self.code_size)
assert not remainder
def get_reader(self, size=None):
if size is None:
size = self.bytes_remaining
else:
assert not size % self.code_size
self.bytes_remaining -= size
self._doc.seek(self.byte_offset)
self.byte_offset += size
reader = self._decoder.reader_cls(self._doc, size)
return TextIOWrapper(reader, self._decoder.encoding, newline="\r")
def skip(self, size):
self.bytes_remaining -= size
self.byte_offset += size
class Cp1252Decoder:
code_size = 1
encoding = "cp1252"
class reader_cls(Subfile):
def read(self, *args):
text = super().read(*args)
assert {0x80, 0x8E, 0x9E}.isdisjoint(text)
return text
class Utf16Decoder:
code_size = 2
encoding = "utf-16-le"
reader_cls = Subfile
def parse_prop_list(prl, ole):
in_table = False
is_ttp = False
while True:
sprm = prl.read(2)
if not sprm:
break
[sprm] = unsigned2.unpack(sprm)
assert sprm >> SGC_BIT & SGC_MASK in {PARAGRAPH, TABLE}
spra = sprm >> SPRA_BIT & SPRA_MASK
sprm &= PROP_MASK
if sprm == sprmPFInTable:
assert spra == 1
[in_table] = prl.read(1)
assert in_table in {0, 1}
elif sprm == sprmPFTtp:
assert spra == 1
[is_ttp] = prl.read(1)
assert is_ttp in {0, 1}
elif sprm == sprmPHugePapx:
assert spra == 3
assert ole
[offset] = unsigned4.unpack(prl.read())
data = ole.openstream("Data")
data.seek(offset)
[cbGrpprl] = unsigned2.unpack(data.read(2))
prl = Subfile(data, cbGrpprl)
data = None
continue
elif spra == 6:
if sprm == sprmTDefTable:
[cb] = unsigned2.unpack(prl.read(2))
assert cb > 1
prl.seek(cb - 1, SEEK_CUR)
else:
[cb] = prl.read(1)
if sprm == sprmPChgTabs and cb == 255:
[cTabs] = prl.read(1)
prl.seek(4 * cTabs, SEEK_CUR)
[cTabs] = prl.read(1)
prl.seek(3 * cTabs, SEEK_CUR)
else:
prl.seek(cb, SEEK_CUR)
else:
prl.seek(SPRA_SIZES[spra], SEEK_CUR)
return (in_table, is_ttp)
def iter_para_buckets(table, fcPlcfBtePapx, lcbPlcfBtePapx):
table.seek(fcPlcfBtePapx)
assert lcbPlcfBtePapx > 4
[n, remainder] = divmod(lcbPlcfBtePapx - 4, 4 + 4)
assert not remainder
[fc] = unsigned4.unpack(table.read(4))
yield fc
aFC1 = table.tell()
aPnBtePapx = aFC1 + n * 4
for i in range(n):
table.seek(aPnBtePapx + i * 4)
[pn] = unsigned4.unpack(table.read(4))
table.seek(aFC1 + i * 4)
[next_fc] = unsigned4.unpack(table.read(4))
assert next_fc >= fc
yield (fc, next_fc, pn & PN_MASK)
fc = next_fc
return None
def iter_paras_from_pn(doc, ole, fc, next_fc, pn, target, buckets):
while True: # For each bucket
doc.seek(pn * 512)
page = doc.read(512)
cpara = page[-1]
page = page[:-1]
[rgfc] = unsigned4.unpack_from(page)
assert rgfc == fc
rgbx = (1 + cpara) * 4
for i in range(cpara):
[next_rgfc] = unsigned4.unpack_from(page, (1 + i) * 4)
assert next_rgfc >= fc
if next_rgfc > target:
bOffset = page[rgbx + i * (1 + 12)]
if bOffset:
bOffset *= 2
cb = page[bOffset]
bOffset += 1
if cb:
cb = cb * 2 - 1
else:
cb = page[bOffset] * 2
bOffset += 1
grpprlInPapx = BytesIO(page[bOffset : bOffset + cb])
[istd] = unsigned2.unpack(grpprlInPapx.read(2))
[in_table, is_ttp] = parse_prop_list(grpprlInPapx, ole)
else:
in_table = False
is_ttp = False
yield (next_rgfc, in_table, is_ttp)
fc = next_rgfc
assert fc == next_fc
try:
[fc, next_fc, pn] = next(buckets)
except StopIteration:
break
def iter_paras_from(doc, ole, table, fcPlcfBtePapx, lcbPlcfBtePapx, target):
buckets = iter_para_buckets(table, fcPlcfBtePapx, lcbPlcfBtePapx)
fc = next(buckets)
if target < fc:
return None
for [fc, next_fc, pn] in buckets:
if next_fc > target:
return iter_paras_from_pn(doc, ole, fc, next_fc, pn,
target, buckets)
return None
def main(file):
with open(file, "rb") as file:
ole = OleFileIO(file)
doc = ole.openstream("WordDocument")
base = FibBase.unpack(doc.read(FibBase.size))
[wIdent, _, _, _, _, bits_fm, _, _, _, _] = base
assert wIdent == WORD_BINARY_FILE
fWhichTblStm = bits_fm >> WHICH_TBL_STM_BIT & 1
[csw] = unsigned2.unpack(doc.read(2))
doc.seek(csw * 2, SEEK_CUR)
[cslw] = unsigned2.unpack(doc.read(2))
doc.seek(cslw * 4, SEEK_CUR)
[cbRgFcLcb] = unsigned2.unpack(doc.read(2))
cbRgFcLcb *= 8
assert cbRgFcLcb >= FibRgFcLcb97.size
fibRgFcLcb97 = FibRgFcLcb97.unpack(doc.read(FibRgFcLcb97.size))
[fcPlcfBtePapx, lcbPlcfBtePapx, fcClx, lcbClx] = fibRgFcLcb97
table = ole.openstream("{}Table".format(fWhichTblStm))
out = TextIOWrapper(stdout.buffer, stdout.encoding, stdout.errors,
newline="", line_buffering=stdout.line_buffering)
try:
writer = csv.writer(out)
row = list()
cell = None
pieces = Pieces(doc, table, fcClx, lcbClx)
i = 0
while i < len(pieces): # For each piece starting a paragraph
piece = pieces[i]
paras = iter_paras_from(doc, ole, table,
fcPlcfBtePapx, lcbPlcfBtePapx, piece.byte_offset)
while True: # For each paragraph in the current piece
# Scan ahead to find how many pieces span this paragraph
j = i
scan_piece = piece
while True:
[end, in_table, is_ttp] = next(paras)
end -= scan_piece.byte_offset
if end <= scan_piece.bytes_remaining:
break
while True: # For each piece without paragraph info
j += 1
piece = pieces[j]
paras = iter_paras_from(doc, table,
fcPlcfBtePapx, lcbPlcfBtePapx,
scan_piece.byte_offset)
if paras is not None:
break
# Found a paragraph spanning pieces i-j
if is_ttp:
writer.writerow(row)
row.clear()
if in_table and not is_ttp:
if not cell:
cell = StringIO()
while i < j:
copyfileobj(piece.get_reader(), cell)
i += 1
piece = pieces[i]
assert end
reader = piece.get_reader(end - piece.code_size)
copyfileobj(reader, cell)
mark = piece.get_reader(piece.code_size).read()
if mark == "\x07":
row.append(cell.getvalue())
cell = None
else:
cell.write(mark)
else:
assert not row
assert not cell
if i < j:
i = j
piece = pieces[i]
piece.skip(end)
if not piece.bytes_remaining:
break
i += 1
assert not row
assert not cell
finally:
out.detach()
for [exctype, msg] in ole.parsing_issues:
print("{}: {}".format(exctype.__name__, msg), file=stderr)
if __name__ == "__main__":
from clifunc import run
run(main)