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cajparser.py
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cajparser.py
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import os
import struct
from shutil import copy
from subprocess import check_output, STDOUT, CalledProcessError
from utils import fnd, fnd_all, add_outlines, fnd_rvrs, fnd_unuse_no, find_redundant_images
try:
from PyPDF2 import errors
except ImportError:
from PyPDF2 import utils as errors
KDH_PASSPHRASE = b"FZHMEI"
printables = ''.join([(len(repr(chr(x)))==3) and (x != 47) and (x < 128) and chr(x) or '.' for x in range(256)])
image_type = {
0 : "JBIG",
1 : "JPEG",
2 : "JPEG", # up-side-down
3 : "JBIG2"
}
class CAJParser(object):
def __init__(self, filename):
self.filename = filename
try:
with open(filename, "rb") as caj:
caj_read4 = caj.read(4)
if (caj_read4[0:1] == b'\xc8'):
self.format = "C8"
self._PAGE_NUMBER_OFFSET = 0x08
self._TOC_NUMBER_OFFSET = 0 # No TOC
self._TOC_END_OFFSET = 0x50
self._PAGEDATA_OFFSET = self._TOC_END_OFFSET + 20 * self.page_num
return
if (caj_read4[0:2] == b'HN'):
if (caj.read(2) == b'\xc8\x00'): # Most of them are: 90 01, handled later
self.format = "HN"
self._PAGE_NUMBER_OFFSET = 0x90
self._TOC_NUMBER_OFFSET = 0
self._TOC_END_OFFSET = 0xD8
self._PAGEDATA_OFFSET = self._TOC_END_OFFSET + 20 * self.page_num
return
fmt = struct.unpack("4s", caj_read4)[0].replace(b'\x00', b'').decode("gb18030")
if fmt == "CAJ":
self.format = "CAJ"
self._PAGE_NUMBER_OFFSET = 0x10
self._TOC_NUMBER_OFFSET = 0x110
elif fmt == "HN":
self.format = "HN"
self._PAGE_NUMBER_OFFSET = 0x90
self._TOC_NUMBER_OFFSET = 0x158
# TOC = [toc_num] followed by [toc_entry * toc_num]
# followed by [Page Info struct (20-byte) * page_num], followed by Page Data
self._TOC_END_OFFSET = self._TOC_NUMBER_OFFSET + 4 + 0x134 * self.toc_num
self._PAGEDATA_OFFSET = self._TOC_END_OFFSET + 20 * self.page_num
elif fmt == "%PDF":
self.format = "PDF"
elif fmt == "KDH ":
self.format = "KDH"
elif fmt == "TEB":
self.format = "TEB"
else:
self.format = None
raise SystemExit("Unknown file type.")
except UnicodeDecodeError:
raise SystemExit("Unknown file type.")
@property
def page_num(self):
with open(self.filename, "rb") as caj:
caj.seek(self._PAGE_NUMBER_OFFSET)
[page_num] = struct.unpack("i", caj.read(4))
return page_num
@property
def toc_num(self):
if (self._TOC_NUMBER_OFFSET == 0):
return 0
with open(self.filename, "rb") as caj:
caj.seek(self._TOC_NUMBER_OFFSET)
[toc_num] = struct.unpack("i", caj.read(4))
return toc_num
def get_toc(self, verbose=False):
toc = []
if (self._TOC_NUMBER_OFFSET == 0):
return toc
with open(self.filename, "rb") as caj:
for i in range(self.toc_num):
caj.seek(self._TOC_NUMBER_OFFSET + 4 + 0x134 * i)
toc_bytes = struct.unpack("256s24s12s12si", caj.read(0x134))
ttl_end = toc_bytes[0].find(b"\x00")
title = toc_bytes[0][0:ttl_end].decode("gb18030").encode("utf-8")
pg_end = toc_bytes[2].find(b"\x00")
page = int(toc_bytes[2][0:pg_end])
level = toc_bytes[4]
toc_entry = {"title": title, "page": page, "level": level}
if ( verbose ):
print(" " * (level -1), title.decode("utf-8"))
toc.append(toc_entry)
if ( verbose ):
print("TOC END: 0x%04X" % (self._TOC_NUMBER_OFFSET + 4 + 0x134 * self.toc_num))
return toc
def output_toc(self, dest):
toc_items = self.get_toc()
with open(dest, "wb") as f:
for toc in toc_items:
f.write(b' ' * (toc["level"] - 1) + toc["title"]
+ b' ' + str(toc["page"]).encode("utf-8") + b'\n')
def convert(self, dest):
if self.format == "CAJ":
self._convert_caj(dest)
elif self.format == "HN":
self._convert_hn(dest)
elif self.format == "C8":
self._convert_hn(dest)
elif self.format == "PDF":
self._convert_pdf(dest)
elif self.format == "KDH":
self._convert_kdh(dest)
def parse(self):
if self.format == "CAJ":
pass
elif self.format == "HN":
self._parse_hn()
elif self.format == "C8":
self._parse_hn()
elif self.format == "PDF":
pass
elif self.format == "KDH":
pass
def text_extract(self):
if self.format == "CAJ":
pass
if self.format == "HN":
self._text_extract_hn()
elif self.format == "C8":
self._text_extract_hn()
elif self.format == "PDF":
pass
elif self.format == "KDH":
pass
def _convert_caj(self, dest):
caj = open(self.filename, "rb")
# Extract original PDF data (and add header)
caj.seek(self._PAGE_NUMBER_OFFSET + 4)
[pdf_start_pointer] = struct.unpack("i", caj.read(4))
caj.seek(pdf_start_pointer)
[pdf_start] = struct.unpack("i", caj.read(4))
pdf_end = fnd_all(caj, b"endobj")[-1] + 6
pdf_length = pdf_end - pdf_start
caj.seek(pdf_start)
pdf_data = b"%PDF-1.3\r\n" + caj.read(pdf_length) + b"\r\n"
with open("pdf.tmp", 'wb') as f:
f.write(pdf_data)
pdf = open("pdf.tmp", "rb")
# deal with disordered PDF data
endobj_addr = fnd_all(pdf, b"endobj")
obj_no = []
for addr in endobj_addr:
startobj = fnd_rvrs(pdf, b" 0 obj", addr)
startobj1 = fnd_rvrs(pdf, b"\r", startobj)
startobj2 = fnd_rvrs(pdf, b"\n", startobj)
startobj = max(startobj1, startobj2)
length = fnd(pdf, b" ", startobj) - startobj
pdf.seek(startobj)
[no] = struct.unpack(str(length) + "s", pdf.read(length))
if int(no) not in obj_no:
obj_no.append(int(no))
obj_len = addr - startobj + 6
pdf.seek(startobj)
[obj] = struct.unpack(str(obj_len) + "s", pdf.read(obj_len))
# Add Catalog (find obj_no of pages)
inds_addr = [i + 8 for i in fnd_all(pdf, b"/Parent")]
inds = []
for addr in inds_addr:
length = fnd(pdf, b" ", addr) - addr
pdf.seek(addr)
[ind] = struct.unpack(str(length) + "s", pdf.read(length))
inds.append(int(ind))
# get pages_obj_no list containing distinct elements
# & find missing pages object(s) -- top pages object(s) in pages_obj_no
pages_obj_no = []
top_pages_obj_no = []
for ind in inds:
if (ind not in pages_obj_no) and (ind not in top_pages_obj_no):
if fnd(pdf, bytes("\r{0} 0 obj".format(ind), "utf-8")) == -1:
top_pages_obj_no.append(ind)
else:
pages_obj_no.append(ind)
single_pages_obj_missed = len(top_pages_obj_no) == 1
multi_pages_obj_missed = len(top_pages_obj_no) > 1
# generate catalog object
catalog_obj_no = fnd_unuse_no(obj_no, top_pages_obj_no)
obj_no.append(catalog_obj_no)
root_pages_obj_no = None
if multi_pages_obj_missed:
root_pages_obj_no = fnd_unuse_no(obj_no, top_pages_obj_no)
elif single_pages_obj_missed:
root_pages_obj_no = top_pages_obj_no[0]
top_pages_obj_no = pages_obj_no
else: # root pages object exists, then find the root pages object #
found = False
for pon in pages_obj_no:
tmp_addr = fnd(pdf, bytes("\r{0} 0 obj".format(pon), 'utf-8'))
while True:
pdf.seek(tmp_addr)
[_str] = struct.unpack("6s", pdf.read(6))
if _str == b"Parent":
break
elif _str == b"endobj":
root_pages_obj_no = pon
found = True
break
tmp_addr = tmp_addr + 1
if found:
break
catalog = bytes("{0} 0 obj\r<</Type /Catalog\r/Pages {1} 0 R\r>>\rendobj\r".format(
catalog_obj_no, root_pages_obj_no), "utf-8")
pdf_data += catalog
pdf.close()
with open("pdf.tmp", 'wb') as f:
f.write(pdf_data)
pdf = open("pdf.tmp", "rb")
# Add Pages obj and EOF mark
# if root pages object exist, pass
# deal with single missing pages object
if single_pages_obj_missed or multi_pages_obj_missed:
inds_str = ["{0} 0 R".format(i) for i in top_pages_obj_no]
kids_str = "[{0}]".format(" ".join(inds_str))
pages_str = "{0} 0 obj\r<<\r/Type /Pages\r/Kids {1}\r/Count {2}\r>>\rendobj\r".format(
root_pages_obj_no, kids_str, self.page_num)
pdf_data += bytes(pages_str, "utf-8")
pdf.close()
with open("pdf.tmp", 'wb') as f:
f.write(pdf_data)
pdf = open("pdf.tmp", "rb")
# deal with multiple missing pages objects
if multi_pages_obj_missed:
kids_dict = {i: [] for i in top_pages_obj_no}
count_dict = {i: 0 for i in top_pages_obj_no}
for tpon in top_pages_obj_no:
kids_addr = fnd_all(pdf, bytes("/Parent {0} 0 R".format(tpon), "utf-8"))
for kid in kids_addr:
ind = fnd_rvrs(pdf, b"obj", kid) - 4
addr = fnd_rvrs(pdf, b"\r", ind)
length = fnd(pdf, b" ", addr) - addr
pdf.seek(addr)
[ind] = struct.unpack(str(length) + "s", pdf.read(length))
kids_dict[tpon].append(int(ind))
type_addr = fnd(pdf, b"/Type", addr) + 5
tmp_addr = fnd(pdf, b"/", type_addr) + 1
pdf.seek(tmp_addr)
[_type] = struct.unpack("5s", pdf.read(5))
if _type == b"Pages":
cnt_addr = fnd(pdf, b"/Count ", addr) + 7
pdf.seek(cnt_addr)
[_str] = struct.unpack("1s", pdf.read(1))
cnt_len = 0
while _str not in [b" ", b"\r", b"/"]:
cnt_len += 1
pdf.seek(cnt_addr + cnt_len)
[_str] = struct.unpack("1s", pdf.read(1))
pdf.seek(cnt_addr)
[cnt] = struct.unpack(str(cnt_len) + "s", pdf.read(cnt_len))
count_dict[tpon] += int(cnt)
else: # _type == b"Page"
count_dict[tpon] += 1
kids_no_str = ["{0} 0 R".format(i) for i in kids_dict[tpon]]
kids_str = "[{0}]".format(" ".join(kids_no_str))
pages_str = "{0} 0 obj\r<<\r/Type /Pages\r/Kids {1}\r/Count {2}\r>>\rendobj\r".format(
tpon, kids_str, count_dict[tpon])
pdf_data += bytes(pages_str, "utf-8")
pdf_data += bytes("\n%%EOF\r", "utf-8")
pdf.close()
with open("pdf.tmp", 'wb') as f:
f.write(pdf_data)
# Use mutool to repair xref
try:
check_output(["mutool", "clean", "pdf.tmp", "pdf_toc.pdf"], stderr=STDOUT)
except CalledProcessError as e:
print(e.output.decode("utf-8"))
print("Command mutool returned non-zero exit status " + str(e.returncode))
print("Try merge mode...")
os.remove("pdf_toc.pdf")
try:
check_output(["mutool", "merge", "-opdf_toc.pdf", "pdf.tmp"], stderr=STDOUT)
except CalledProcessError as e:
print(e.output.decode("utf-8"))
SystemExit("Merge mode also failed.")
# Add Outlines
try:
add_outlines(self.get_toc(), "pdf_toc.pdf", dest)
except errors.PdfReadError as e:
print("errors.PdfReadError:", str(e))
copy("pdf_toc.pdf", dest)
pass
os.remove("pdf.tmp")
os.remove("pdf_toc.pdf")
def _convert_hn(self, dest):
caj = open(self.filename, "rb")
image_list = []
from pdfwutils import Colorspace, ImageFormat, convert_ImageList
import zlib
for i in range(self.page_num):
caj.seek(self._TOC_END_OFFSET + i * 20)
[page_data_offset, size_of_text_section, images_per_page, page_no, unk2, next_page_data_offset] = struct.unpack("iihhii", caj.read(20))
caj.seek(page_data_offset)
text_header_read32 = caj.read(32)
if ((text_header_read32[8:20] == b'COMPRESSTEXT') or (text_header_read32[0:12] == b'COMPRESSTEXT')):
coff = 8
if (text_header_read32[0:12] == b'COMPRESSTEXT'):
coff = 0
[expanded_text_size] = struct.unpack("i", text_header_read32[12+coff:16+coff])
import zlib
caj.seek(page_data_offset + 16 + coff)
data = caj.read(size_of_text_section - 16 - coff)
output = zlib.decompress(data, bufsize=expanded_text_size)
if (len(output) != expanded_text_size):
raise SystemExit("Unexpected:", len(output), expanded_text_size)
else:
caj.seek(page_data_offset)
output = caj.read(size_of_text_section)
from HNParsePage import HNParsePage
page_style = (next_page_data_offset > page_data_offset)
page_data = HNParsePage(output, page_style)
current_offset = page_data_offset + size_of_text_section
(found, images_per_page) = find_redundant_images(caj, current_offset, images_per_page)
if (found):
print("Page %d, skipping %d redundant images" % (i+1, images_per_page * ( images_per_page - 1)))
if (images_per_page > 1):
if (len(page_data.figures) == images_per_page):
if (page_data.figures[0][0] == 0) and (page_data.figures[0][1] == 0):
image_list.append(None)
image_list.append(page_data.figures)
else:
print("Page %d, Image Count %d, first image not at origin, expanding to %d pages"
% (i+1, len(page_data.figures), images_per_page))
else:
print("Page %d, Image Count %d != %d" % (i+1, len(page_data.figures), images_per_page))
if (len(page_data.figures) > images_per_page):
print("\tTruncating Page %d," % (i+1), page_data.figures)
image_list.append(None)
image_list.append(page_data.figures[0:images_per_page])
else:
print("Page %d expanding to %d separate image pages" % (i+1, images_per_page))
elif (images_per_page == 1):
if ((len(page_data.figures) == 0) or
((len(page_data.figures) > 0) and
(not ((page_data.figures[0][0] == 0) and (page_data.figures[0][1] == 0))))):
print("Page %d possibly text-only + single figure(%d)" % (i+1, len(page_data.figures)))
else:
# don't care about images_per_page == 0
pass
for j in range(images_per_page):
caj.seek(current_offset)
read32 = caj.read(32)
[image_type_enum, offset_to_image_data, size_of_image_data] = struct.unpack("iii", read32[0:12])
if (offset_to_image_data != current_offset + 12):
raise SystemExit("unusual image offset")
caj.seek(offset_to_image_data)
image_data = caj.read(size_of_image_data)
current_offset = offset_to_image_data + size_of_image_data
if (image_type[image_type_enum] == "JBIG"):
from jbigdec import CImage
cimage = CImage(image_data)
out = cimage.DecodeJbig()
# PBM is only padded to 8 rather than 32.
# If the padding is larger, write padded file.
width = cimage.width
if (cimage.bytes_per_line > ((cimage.width +7) >> 3)):
width = cimage.bytes_per_line << 3
image_item = (
Colorspace.P,
(300, 300),
ImageFormat.PBM,
zlib.compress(out),
width,
cimage.height,
[0xffffff, 0],
False,
1,
0
)
elif (image_type[image_type_enum] == "JBIG2"):
from jbig2dec import CImage
cimage = CImage(image_data)
out = cimage.DecodeJbig2()
# PBM is only padded to 8 rather than 32.
# If the padding is larger, write padded file.
width = cimage.width
if (cimage.bytes_per_line > ((cimage.width +7) >> 3)):
width = cimage.bytes_per_line << 3
image_item = (
Colorspace.P,
(300, 300),
ImageFormat.PBM,
zlib.compress(out),
width,
cimage.height,
[0xffffff, 0],
False,
1,
0
)
elif (image_type[image_type_enum] == "JPEG"):
colorspace = Colorspace.RGB
component = 3
# stock libjpeg location
(SOFn, frame_length, bits_per_pixel, height, width, component) = struct.unpack(">HHBHHB", image_data[158:168])
if (SOFn != 0xFFC0):
# "Intel(R) JPEG Library" location
(SOFn, frame_length, bits_per_pixel, height, width, component) = struct.unpack(">HHBHHB", image_data[0x272:0x27c])
if (SOFn != 0xFFC0):
# neither works, try brute-force
import imagesize
from PIL import Image as pilimage
with open(".tmp.jpg", "wb") as f:
f.write(image_data)
(width, height) = imagesize.get(".tmp.jpg")
pim = pilimage.open(".tmp.jpg")
if (pim.mode == 'L'):
component = 1
os.remove(".tmp.jpg")
if (image_type_enum == 1):
# non-inverted JPEG Images
height = -height
if (component == 1):
colorspace = Colorspace.L
image_item = (
colorspace,
(300, 300),
ImageFormat.JPEG,
image_data,
width,
height,
[],
False,
8,
0
)
else:
raise SystemExit("Unknown Image Type %d" % (image_type_enum))
image_list.append(image_item)
if (len(image_list) == 0):
raise SystemExit("File is pure-text HN; cannot convert to pdf")
pdf_data = convert_ImageList(image_list)
with open('pdf_toc.pdf', 'wb') as f:
f.write(pdf_data)
# Add Outlines
add_outlines(self.get_toc(), "pdf_toc.pdf", dest)
os.remove("pdf_toc.pdf")
def _text_extract_hn(self):
if (self._TOC_NUMBER_OFFSET > 0):
self.get_toc(verbose=True)
caj = open(self.filename, "rb")
for i in range(self.page_num):
caj.seek(self._TOC_END_OFFSET + i * 20)
[page_data_offset, size_of_text_section, images_per_page, page_no, unk2, next_page_data_offset] = struct.unpack("iihhii", caj.read(20))
caj.seek(page_data_offset)
text_header_read32 = caj.read(32)
if ((text_header_read32[8:20] == b'COMPRESSTEXT') or (text_header_read32[0:12] == b'COMPRESSTEXT')):
coff = 8
if (text_header_read32[0:12] == b'COMPRESSTEXT'):
coff = 0
[expanded_text_size] = struct.unpack("i", text_header_read32[12+coff:16+coff])
import zlib
caj.seek(page_data_offset + 16 + coff)
data = caj.read(size_of_text_section - 16 - coff)
output = zlib.decompress(data, bufsize=expanded_text_size)
if (len(output) != expanded_text_size):
raise SystemExit("Unexpected:", len(output), expanded_text_size)
else:
caj.seek(page_data_offset)
output = caj.read(size_of_text_section)
from HNParsePage import HNParsePage
page_style = (next_page_data_offset > page_data_offset)
page_data = HNParsePage(output, page_style)
print("Text on Page %d:" % (i+1))
print(page_data.texts)
#print("Figures:\n", page_data.figures)
def _parse_hn(self):
if (self._TOC_NUMBER_OFFSET > 0):
self.get_toc(verbose=True)
caj = open(self.filename, "rb")
for i in range(self.page_num):
caj.seek(self._TOC_END_OFFSET + i * 20)
print("Reading Page Info struct #%d at offset 0x%04X" % (i+1, self._TOC_END_OFFSET + i * 20))
[page_data_offset, size_of_text_section, images_per_page, page_no, unk2, next_page_data_offset] = struct.unpack("iihhii", caj.read(20))
print("unknown page struct members = (%d %d)" % (unk2, next_page_data_offset))
# All 71: 1,0,0
print("Page Number %d Data offset = 0x%04X" % (page_no, page_data_offset))
caj.seek(page_data_offset)
text_header_read32 = caj.read(32)
print("Page Text Header dump:\n", self.dump(text_header_read32), sep="")
# The first 8 bytes are always: 03 80 XX 16 03 80 XX XX,
# the last one 20 or 21, but the first two can be any.
# 48/71 has: 03 80 E0 16 03 80 F7 20, the rest uniq
if ((text_header_read32[8:20] == b'COMPRESSTEXT') or (text_header_read32[0:12] == b'COMPRESSTEXT')):
coff = 8
if (text_header_read32[0:12] == b'COMPRESSTEXT'):
coff = 0
# expanded_text_size seems to be always about 2-3 times size_of_text_section, so this is a guess.
[expanded_text_size] = struct.unpack("i", text_header_read32[12+coff:16+coff])
import zlib
caj.seek(page_data_offset + 16 + coff)
data = caj.read(size_of_text_section - 16 - coff)
output = zlib.decompress(data, bufsize=expanded_text_size)
if (len(output) != expanded_text_size):
print("Unexpected:", len(output), expanded_text_size)
print("Page Text Header COMPRESSTEXT:\n", self.dump(output, GB=True), sep="")
for x in range(len(output) >> 4):
try:
print(bytes([output[(x << 4) + 7],output[(x << 4) + 6]]).decode("gbk"), end="")
except UnicodeDecodeError:
print(self.dump(output[x << 4:(x+1) << 4]))
print()
else:
caj.seek(page_data_offset)
output = caj.read(size_of_text_section)
print("Page Text Header non-COMPRESSTEXT:\n", self.dump(output, GB=True), sep="")
from HNParsePage import HNParsePage
page_style = (next_page_data_offset > page_data_offset)
page_data = HNParsePage(output, page_style)
print("Text:\n", page_data.texts)
print("Figures:\n", page_data.figures)
current_offset = page_data_offset + size_of_text_section
for j in range(images_per_page):
caj.seek(current_offset)
read32 = caj.read(32)
[image_type_enum, offset_to_image_data, size_of_image_data] = struct.unpack("iii", read32[0:12])
if (image_type[image_type_enum] != "JPEG"):
read32 += caj.read(64)
print("size of image data = %d (%s)" % (size_of_image_data, image_type[image_type_enum]))
if (offset_to_image_data != current_offset + 12):
raise SystemExit("unusual image offset")
print("Page Image Header dump:\n", self.dump(read32), sep="")
print("Expected End of Page #%d: 0x%08X" % (i+1, current_offset + size_of_image_data + 12))
caj.seek(offset_to_image_data)
image_data = caj.read(size_of_image_data)
current_offset = offset_to_image_data + size_of_image_data
image_name = "image_dump_%04d" % (i+1)
if (j > 0):
image_name = "image_dump_%04d_%04d" % (i+1, j)
with open(image_name + ".dat", "wb") as f:
f.write(image_data)
if (image_type[image_type_enum] == "JBIG"):
try:
from jbigdec import SaveJbigAsBmp
SaveJbigAsBmp(image_data, size_of_image_data, (image_name + ".bmp").encode('ascii'))
except ImportError:
pass
elif (image_type[image_type_enum] == "JBIG2"):
try:
from jbigdec import SaveJbig2AsBmp
SaveJbig2AsBmp(image_data, size_of_image_data, (image_name + ".bmp").encode('ascii'))
except ImportError:
pass
elif (image_type[image_type_enum] == "JPEG"):
with open(image_name + ".jpg", "wb") as f:
f.write(image_data)
print("end 0x%08x" % self._PAGEDATA_OFFSET)
def dump(self, src, GB=False):
N=0
result=[]
while src:
s,src = src[:16],src[16:]
hexa = ' '.join(["%02X"% x for x in s])
gb = ""
if (GB):
gb += " "
for x in range(len(s) >> 1):
try:
if (s[(x << 1) +1] < 128 and s[(x << 1) + 0] < 128):
gb += ".."
else:
gb += bytes([s[(x << 1) + 1],s[(x << 1) + 0]]).decode("gbk")
except UnicodeDecodeError:
gb += ".."
s = ''.join(printables[x] for x in s)
result += "%04X %-*s %s%s\n" % (N, 16*3, hexa, s, gb)
N+=16
return ''.join(result)
def _convert_pdf(self, dest):
copy(self.filename, dest)
def _convert_kdh(self, dest):
# Read KDH file.
fp = open(self.filename, "rb")
origin = fp.read()
fp.close()
# Decrypt.
origin = origin[254:]
output = []
keycursor = 0
for origin_byte in origin:
output.append(origin_byte ^ KDH_PASSPHRASE[keycursor])
keycursor += 1
if keycursor >= len(KDH_PASSPHRASE):
keycursor = 0
output = bytes(output)
# Remove useless tail data.
eofpos = output.rfind(b"%%EOF")
if eofpos < 0:
raise Exception("%%EOF mark can't be found.")
output = output[:eofpos + 5]
# Write output file.
fp = open(dest + ".tmp", "wb")
fp.write(output)
fp.close()
# Use mutool to repair xref
try:
check_output(["mutool", "clean", dest + ".tmp", dest], stderr=STDOUT)
except CalledProcessError as e:
print(e.output.decode("utf-8"))
raise SystemExit("Command mutool returned non-zero exit status " + str(e.returncode))
os.remove(dest + ".tmp")