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pdf_object_extractor_1.py
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pdf_object_extractor_1.py
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# -*- coding: utf-8 -*-
"""
Created on Mon Jan 8 15:13:22 2018 (1396-10-16)
File name: pdf_object_extractor
@author: Morteza Zakeri
Description:
This file use to extract data object in (set of) PDF files.
We use mutool a subprogram of mupdf an open source pdf library, readers and tools.
"""
import sys
import subprocess
import re
def get_xref(pdf_file_path, mutool_path='D:\\afl\\mupdf-1.11-windows\\mutool.exe',
mutool_command=' show -e ', mutool_object_number=' x'):
# command line to get xref size
cmd = mutool_path + mutool_command + pdf_file_path + mutool_object_number
# cmd = 'dir'
# cmd = 'D:\\afl\\mupdf-1.11-windows\\mutool.exe show -e D:\\afl\\mupdf-1.11-windows\\input\\pdftc_100k_2708.pdf x'
returned_value_in_byte = subprocess.check_output(cmd, shell=True)
return_value_in_string = returned_value_in_byte.decode()
# print command line output to see it in python console
# print(return_value_in_string)
start_index_string = ''
end_index_string = ''
index = 6
while(return_value_in_string[index].isdigit()):
start_index_string += return_value_in_string[index]
index+=1
index+=1
while(return_value_in_string[index].isdigit()):
end_index_string += return_value_in_string[index]
index += 1
start_index_integer = int(start_index_string)
end_index_integer = int(end_index_string)
# print(start_index_integer, end_index_integer)
return start_index_integer,end_index_integer
def get_pdf_objects(pdf_file_path, mutool_path='D:\\afl\\mupdf-1.11-windows\\mutool.exe',
mutool_command=' show -e ', mutool_object_number=' x'):
cmd = mutool_path + mutool_command + pdf_file_path + mutool_object_number
# cmd = 'D:\\afl\\mupdf-1.11-windows\\mutool.exe show -e D:\\afl\\mupdf-1.11-windows\\input\\pdftc_100k_2708.pdf '
# print(cmd)
returned_value_in_byte = subprocess.check_output(cmd, shell=True)
return_value_in_string = returned_value_in_byte.decode()
# can I use regexp?
# return_value = re.sub(r'stream.*endstream', 'stream', return_value_in_string, flags=re.DOTALL)
# print(return_value_in_string)
stream_start = 0
stream_end = 0
new_seq = ''
# input()
while(return_value_in_string.find('endstream', stream_end+9) != -1):
stream_start = return_value_in_string.find('stream', stream_end+9)
new_seq += return_value_in_string[stream_end:stream_start+6]
stream_end = return_value_in_string.find('endstream', stream_end+9)
# if(stream_start != -1 and stream_end != -1):
# for i in range(stream_start+6,stream_end):
# return_value_in_list.(i)
# print(stream_start, stream_end)
new_seq+= return_value_in_string[stream_end:len(return_value_in_string)]
new_seq = new_seq.replace('streamendstream', 'stream')
# print(new_seq)
new_seq = re.sub(r'\d+ \d+ obj', "obj", new_seq)
# print(new_seq)
# need to replace all \r to reduce size of corpus
new_seq = new_seq.replace('\r','')
return new_seq
def main(argv):
total_extracted_object = 0
pdf_file_path = 'C:\\Users\\Morteza\\Desktop\\corpus_garbage\\mozilla\\'
min_pdf_file_id = 1
max_pdf_file_id = 341
current_pdf_file_id = min_pdf_file_id
for i in range(min_pdf_file_id, max_pdf_file_id):
try:
pdf_file_path += ('pdftc_mozilla_' + str(current_pdf_file_id).zfill(4) +'.pdf')
start_index_integer,end_index_integer = get_xref(pdf_file_path)
mutool_object_number = ' '
for index in range (start_index_integer+1, end_index_integer):
mutool_object_number += str(index) + ' '
object_seq = get_pdf_objects(pdf_file_path, mutool_object_number=mutool_object_number)
#print(object_seq)
#input()
object_file_path = 'C:\\Users\\Morteza\\Desktop\\corpus_garbage\\mozilla' \
+ '\\pdf_objects\\pdftc_mozilla_' \
+ str(current_pdf_file_id).zfill(4) + '_' \
+ str(end_index_integer-1)+ '_obj.pdfobjects'
#print(object_file_name)
with open(object_file_path, 'w') as new_file:
new_file.write(object_seq)
total_extracted_object += (end_index_integer - 1)
print('Extracting successfull: ', str(current_pdf_file_id).zfill(4))
except Exception as e:
print('Extracting error: ', str(current_pdf_file_id).zfill(4), file=sys.stderr)
print(str(e), file=sys.stderr)
finally:
current_pdf_file_id += 1
pdf_file_path = 'C:\\Users\\Morteza\\Desktop\\corpus_garbage\\mozilla\\'
print('total_extracted_object: ', total_extracted_object)
if __name__ == "__main__":
main(sys.argv)