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https://github.com/ocrmypdf/OCRmyPDF.git
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73 lines
2.5 KiB
Python
73 lines
2.5 KiB
Python
# © 2020 James R. Barlow: github.com/jbarlow83
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#
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# Permission is hereby granted, free of charge, to any person obtaining a
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# copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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"""Tesseract bad utf8
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In some cases, some versions of Tesseract can output binary gibberish or data
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that is not UTF-8 compatible, so we are forced to check that we can convert it
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and present it to the user.
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"""
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from contextlib import contextmanager
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from subprocess import CalledProcessError
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from unittest.mock import patch
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from ocrmypdf import hookimpl
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from ocrmypdf.builtin_plugins.tesseract_ocr import TesseractOcrEngine
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def bad_utf8(*args, **kwargs):
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raise CalledProcessError(
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1,
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'tesseract',
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output=b'\x96\xb3\x8c\xf8\x82\xc8UTF-8\x0a', # "Invalid UTF-8" in Shift JIS
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stderr=b"",
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)
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@contextmanager
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def patch_tesseract_run():
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with patch('ocrmypdf._exec.tesseract.run') as mock:
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mock.side_effect = bad_utf8
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yield
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mock.assert_called()
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class BadUtf8OcrEngine(TesseractOcrEngine):
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@staticmethod
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def generate_hocr(input_file, output_hocr, output_text, options):
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with patch_tesseract_run():
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TesseractOcrEngine.generate_hocr(
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input_file, output_hocr, output_text, options
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)
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@staticmethod
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def generate_pdf(input_file, output_pdf, output_text, options):
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with patch_tesseract_run():
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TesseractOcrEngine.generate_pdf(
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input_file, output_pdf, output_text, options
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)
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@hookimpl
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def get_ocr_engine():
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return BadUtf8OcrEngine()
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