forked from josch/img2pdf
109 lines
4.4 KiB
Python
109 lines
4.4 KiB
Python
import unittest
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import os
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import img2pdf
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import zlib
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from PIL import Image
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HERE = os.path.dirname(__file__)
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#convert +set date:create +set date:modify -define png:exclude-chunk=time
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def test_suite():
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class TestImg2Pdf(unittest.TestCase):
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pass
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for test_name in os.listdir(os.path.join(HERE, "input")):
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inputf = os.path.join(HERE, "input", test_name)
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if not os.path.isfile(inputf):
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continue
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outputf = os.path.join(HERE, "output", test_name+".pdf")
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assert os.path.isfile(outputf)
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def handle(self, f=inputf, out=outputf):
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with open(f, "rb") as inf:
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orig_imgdata = inf.read()
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pdf = img2pdf.convert([f], nodate=True)
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imgdata = b""
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instream = False
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imgobj = False
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colorspace = None
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imgfilter = None
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width = None
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height = None
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length = None
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# ugly workaround to parse the created pdf
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for line in pdf.split(b'\n'):
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if instream:
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if line == b"endstream":
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break
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else:
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imgdata += line + b'\n'
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else:
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if imgobj and line == b"stream":
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instream = True
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elif b"/Subtype /Image" in line:
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imgobj = True
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elif b"/Width" in line:
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width = int(line.split()[-1])
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elif b"/Height" in line:
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height = int(line.split()[-1])
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elif b"/Length" in line:
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length = int(line.split()[-1])
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elif b"/Filter" in line:
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imgfilter = line.split()[-2]
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elif b"/ColorSpace" in line:
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colorspace = line.split()[-1]
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# remove trailing \n
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imgdata = imgdata[:-1]
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# test if the length field is correct
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self.assertEqual(len(imgdata), length)
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# test if the filter is valid:
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self.assertIn(imgfilter, [b"/DCTDecode", b"/JPXDecode", b"/FlateDecode"])
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# test if the colorspace is valid
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self.assertIn(colorspace, [b"/DeviceGray", b"/DeviceRGB", b"/DeviceCMYK"])
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# test if the image has correct size
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orig_img = Image.open(f)
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self.assertEqual(width, orig_img.size[0])
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self.assertEqual(height, orig_img.size[1])
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# if the input file is a jpeg then it should've been copied
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# verbatim into the PDF
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if imgfilter in [b"/DCTDecode", b"/JPXDecode"]:
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self.assertEqual(imgdata, orig_imgdata)
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elif imgfilter == b"/FlateDecode":
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# otherwise, the data is flate encoded and has to be equal to
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# the pixel data of the input image
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imgdata = zlib.decompress(imgdata)
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if colorspace == b"/DeviceGray":
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colorspace = 'L'
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elif colorspace == b"/DeviceRGB":
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colorspace = 'RGB'
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elif colorspace == b"/DeviceCMYK":
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colorspace = 'CMYK'
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else:
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raise Exception("invalid colorspace")
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im = Image.frombytes(colorspace, (width, height), imgdata)
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if orig_img.mode == '1':
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orig_img = orig_img.convert("L")
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elif orig_img.mode not in ("RGB", "L", "CMYK", "CMYK;I"):
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orig_img = orig_img.convert("RGB")
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self.assertEqual(im.tobytes(), orig_img.tobytes())
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# the python-pil version 2.3.0-1ubuntu3 in Ubuntu does not have the close() method
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try:
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im.close()
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except AttributeError:
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pass
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# lastly, make sure that the generated pdf matches bit by bit the
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# expected pdf
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with open(out, "rb") as outf:
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out = outf.read()
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self.assertEqual(pdf, out)
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# the python-pil version 2.3.0-1ubuntu3 in Ubuntu does not have the close() method
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try:
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orig_img.close()
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except AttributeError:
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pass
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setattr(TestImg2Pdf, "test_%s"%test_name, handle)
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return unittest.TestSuite((
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unittest.makeSuite(TestImg2Pdf),
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))
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