100 lines
3.0 KiB
Python
100 lines
3.0 KiB
Python
# © 2017 James R. Barlow: github.com/jbarlow83
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#
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# This file is part of OCRmyPDF.
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#
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# OCRmyPDF is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# OCRmyPDF is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with OCRmyPDF. If not, see <http://www.gnu.org/licenses/>.
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from subprocess import CalledProcessError, STDOUT, PIPE, run
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from functools import lru_cache
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from ..exceptions import InputFileError, SubprocessOutputError, \
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EncryptedPdfError
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from . import get_version
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@lru_cache(maxsize=1)
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def version():
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return get_version('qpdf', regex=r'qpdf version (.+)')
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def check(input_file, log=None):
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args_qpdf = [
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'qpdf',
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'--check',
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input_file
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]
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if log is None:
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import logging as log
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try:
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run(args_qpdf, stderr=STDOUT, stdout=PIPE, universal_newlines=True,
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check=True)
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except CalledProcessError as e:
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if e.returncode == 2:
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log.error("{0}: not a valid PDF, and could not repair it.".format(
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input_file))
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log.error("Details:")
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log.error(e.output)
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elif e.returncode == 3:
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log.info("qpdf --check returned warnings:")
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log.info(e.output)
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else:
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log.warning(e.output)
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return False
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return True
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def _probably_encrypted(e):
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"""qpdf can report a false positive "file is encrypted" message for damaged
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files - suppress this"""
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return e.returncode == 2 and \
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'invalid password' in e.output and \
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'file is damaged' not in e.output
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def repair(input_file, output_file, log):
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args_qpdf = [
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'qpdf', input_file, output_file
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]
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try:
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run(args_qpdf, stderr=STDOUT, stdout=PIPE, universal_newlines=True,
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check=True)
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except CalledProcessError as e:
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if e.returncode == 3 and e.output.find("operation succeeded"):
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log.debug('qpdf found and fixed errors: ' + e.output)
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return
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if _probably_encrypted(e):
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raise EncryptedPdfError() from e
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elif e.returncode == 2:
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log.error("{0}: not a valid PDF, and could not repair it.".format(
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input_file))
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log.error("Details: " + e.output)
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raise InputFileError() from e
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else:
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log.error("{0}: unknown error".format(
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input_file))
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log.error(e.output)
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raise SubprocessOutputError() from e
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def extract_page(input_file, output_file, pageno):
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args_qpdf = [
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'qpdf', input_file,
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'--pages', input_file, '{0}'.format(pageno + 1), '--',
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output_file
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]
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run(args_qpdf, check=True)
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