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src/tests/__init__.py: use pikepdf instead of pdfrw

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Johannes 'josch' Schauer 4 years ago
parent c808061b4b
commit 997fe8efd8
Signed by untrusted user: josch
GPG Key ID: F2CBA5C78FBD83E1
1 changed files with 47 additions and 108 deletions
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155
src/tests/__init__.py
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@ -7,57 +7,11 @@ import sys
import zlib
from PIL import Image
from io import StringIO, BytesIO, TextIOWrapper
import pikepdf
import decimal
HERE = os.path.dirname(__file__)
PdfReaderIO = StringIO
# Recompressing the image stream makes the comparison robust against output
# preserving changes in the zlib compress output bitstream
# (e.g. between different zlib implementations/versions/releases).
# Without this, some img2pdf 0.3.2 tests fail on Fedora 29/aarch64.
# See also:
# https://gitlab.mister-muffin.de/josch/img2pdf/issues/51
# https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/R7GD4L5Z6HELCDAL2RDESWR2F3ZXHWVX/
def recompress_last_stream(bs):
length_pos = bs.rindex(b'/Length')
li = length_pos + 8
lj = bs.index(b' ', li)
n = int(bs[li:lj])
stream_pos = bs.index(b'\nstream\n', lj)
si = stream_pos + 8
sj = si + n
startx_pos = bs.rindex(b'\nstartxref\n')
xi = startx_pos + 11
xj = bs.index(b'\n', xi)
m = int(bs[xi:xj])
unc_t = zlib.decompress(bs[si:sj])
t = zlib.compress(unc_t)
new_len = str(len(t)).encode('ascii')
u = (lj-li) + n
v = len(new_len) + len(t)
off = v - u
rs = (bs[:li] + new_len + bs[lj:si] + t + bs[sj:xi]
+ str(m+off).encode('ascii') + bs[xj:])
return rs
def compare_pdf(outx, outy):
if b'/FlateDecode' in outx:
x = recompress_last_stream(outx)
y = recompress_last_stream(outy)
if x != y:
print('original outx:\n{}\nouty:\n{}\n'.format(outx, outy), file=sys.stderr)
print('recompressed outx:\n{}\nouty:\n{}\n'.format(x, y), file=sys.stderr)
return False
else:
if outx != outy:
print('original outx:\n{}\nouty:\n{}\n'.format(outx, outy), file=sys.stderr)
return True
# convert +set date:create +set date:modify -define png:exclude-chunk=time
# we define some variables so that the table below can be narrower
@ -535,34 +489,24 @@ def test_suite():
assert os.path.isfile(outputf)
def handle(self, f=inputf, out=outputf, with_pdfrw=with_pdfrw):
try:
from pdfrw import PdfReader, PdfName, PdfWriter
from pdfrw.py23_diffs import convert_load, convert_store
except ImportError:
# the test requires pdfrw
self.skipTest("this test requires pdfrw")
return
with open(f, "rb") as inf:
orig_imgdata = inf.read()
output = img2pdf.convert(orig_imgdata, nodate=True,
with_pdfrw=with_pdfrw)
x = PdfReader(PdfReaderIO(convert_load(output)))
self.assertEqual(sorted(x.keys()), [PdfName.Info, PdfName.Root,
PdfName.Size])
self.assertIn(x.Root.Pages.Count, ('1', '2'))
x = pikepdf.open(BytesIO(output))
self.assertIn(x.Root.Pages.Count, (1, 2))
if len(x.Root.Pages.Kids) == '1':
self.assertEqual(x.Size, '7')
self.assertEqual(len(x.Root.Pages.Kids), 1)
elif len(x.Root.Pages.Kids) == '2':
self.assertEqual(x.Size, '10')
self.assertEqual(len(x.Root.Pages.Kids), 2)
self.assertEqual(x.Info, {})
self.assertEqual(sorted(x.Root.keys()), [PdfName.Pages,
PdfName.Type])
self.assertEqual(x.Root.Type, PdfName.Catalog)
self.assertEqual(sorted(x.Root.keys()), ["/Pages",
"/Type"])
self.assertEqual(x.Root.Type, "/Catalog")
self.assertEqual(sorted(x.Root.Pages.keys()),
[PdfName.Count, PdfName.Kids, PdfName.Type])
self.assertEqual(x.Root.Pages.Type, PdfName.Pages)
["/Count", "/Kids", "/Type"])
self.assertEqual(x.Root.Pages.Type, "/Pages")
orig_img = Image.open(f)
for pagenum in range(len(x.Root.Pages.Kids)):
# retrieve the original image frame that this page was
@ -583,57 +527,54 @@ def test_suite():
def format_float(f):
if int(f) == f:
return str(int(f))
return int(f)
else:
return ("%.4f" % f).rstrip("0")
return decimal.Decimal("%.4f" % f)
self.assertEqual(sorted(cur_page.keys()),
[PdfName.Contents, PdfName.MediaBox,
PdfName.Parent, PdfName.Resources,
PdfName.Type])
["/Contents", "/MediaBox",
"/Parent", "/Resources",
"/Type"])
self.assertEqual(cur_page.MediaBox,
['0', '0', format_float(pagewidth),
format_float(pageheight)])
pikepdf.Array([0, 0, format_float(pagewidth),
format_float(pageheight)]))
self.assertEqual(cur_page.Parent, x.Root.Pages)
self.assertEqual(cur_page.Type, PdfName.Page)
self.assertEqual(cur_page.Type, "/Page")
self.assertEqual(cur_page.Resources.keys(),
[PdfName.XObject])
{"/XObject"})
self.assertEqual(cur_page.Resources.XObject.keys(),
[PdfName.Im0])
self.assertEqual(cur_page.Contents.keys(),
[PdfName.Length])
{"/Im0"})
self.assertEqual(cur_page.Contents.Length,
str(len(cur_page.Contents.stream)))
self.assertEqual(cur_page.Contents.stream,
"q\n%.4f 0 0 %.4f 0.0000 0.0000 cm\n"
"/Im0 Do\nQ" % (pagewidth, pageheight))
len(cur_page.Contents.read_bytes()))
self.assertEqual(cur_page.Contents.read_bytes(),
b"q\n%.4f 0 0 %.4f 0.0000 0.0000 cm\n"
b"/Im0 Do\nQ" % (pagewidth, pageheight))
imgprops = cur_page.Resources.XObject.Im0
# test if the filter is valid:
self.assertIn(
imgprops.Filter, [PdfName.DCTDecode, PdfName.JPXDecode,
PdfName.FlateDecode,
[PdfName.CCITTFaxDecode]])
imgprops.Filter, ["/DCTDecode", "/JPXDecode",
"/FlateDecode",
pikepdf.Array([ pikepdf.Name.CCITTFaxDecode ])])
# test if the image has correct size
self.assertEqual(imgprops.Width, str(orig_img.size[0]))
self.assertEqual(imgprops.Height, str(orig_img.size[1]))
self.assertEqual(imgprops.Width, orig_img.size[0])
self.assertEqual(imgprops.Height, orig_img.size[1])
# if the input file is a jpeg then it should've been copied
# verbatim into the PDF
if imgprops.Filter in [PdfName.DCTDecode,
PdfName.JPXDecode]:
if imgprops.Filter in ["/DCTDecode",
"/JPXDecode"]:
self.assertEqual(
cur_page.Resources.XObject.Im0.stream,
convert_load(orig_imgdata))
elif imgprops.Filter == [PdfName.CCITTFaxDecode]:
cur_page.Resources.XObject.Im0.read_raw_bytes(),
orig_imgdata)
elif imgprops.Filter == pikepdf.Array([ pikepdf.Name.CCITTFaxDecode ]):
tiff_header = tiff_header_for_ccitt(
int(imgprops.Width), int(imgprops.Height),
int(imgprops.Length), 4)
imgio = BytesIO()
imgio.write(tiff_header)
imgio.write(convert_store(
cur_page.Resources.XObject.Im0.stream))
imgio.write(cur_page.Resources.XObject.Im0.read_raw_bytes())
imgio.seek(0)
im = Image.open(imgio)
self.assertEqual(im.tobytes(), orig_img.tobytes())
@ -641,13 +582,12 @@ def test_suite():
im.close()
except AttributeError:
pass
elif imgprops.Filter == PdfName.FlateDecode:
elif imgprops.Filter == "/FlateDecode":
# otherwise, the data is flate encoded and has to be equal
# to the pixel data of the input image
imgdata = zlib.decompress(
convert_store(cur_page.Resources.XObject.Im0.stream))
if imgprops.DecodeParms:
cur_page.Resources.XObject.Im0.read_raw_bytes())
if hasattr(imgprops, "DecodeParms"):
if orig_img.format == 'PNG':
pngidat, palette = img2pdf.parse_png(orig_imgdata)
elif orig_img.format == 'TIFF' \
@ -664,11 +604,11 @@ def test_suite():
self.assertEqual(zlib.decompress(pngidat), imgdata)
else:
colorspace = imgprops.ColorSpace
if colorspace == PdfName.DeviceGray:
if colorspace == "/DeviceGray":
colorspace = 'L'
elif colorspace == PdfName.DeviceRGB:
elif colorspace == "/DeviceRGB":
colorspace = 'RGB'
elif colorspace == PdfName.DeviceCMYK:
elif colorspace == "/DeviceCMYK":
colorspace = 'CMYK'
else:
raise Exception("invalid colorspace")
@ -689,18 +629,17 @@ def test_suite():
im.close()
except AttributeError:
pass
else:
raise Exception("unknown filter")
# now use pdfrw to parse and then write out both pdfs and check the
# result for equality
y = PdfReader(out)
y = pikepdf.open(out)
outx = BytesIO()
outy = BytesIO()
xwriter = PdfWriter()
ywriter = PdfWriter()
xwriter.trailer = x
ywriter.trailer = y
xwriter.write(outx)
ywriter.write(outy)
self.assertEqual(compare_pdf(outx.getvalue(), outy.getvalue()), True)
x.save(outx, compress_streams = False, static_id=True)
y.save(outy, compress_streams = False, static_id=True)
self.assertEqual(outx.getvalue(), outy.getvalue())
# the python-pil version 2.3.0-1ubuntu3 in Ubuntu does not have the
# close() method
try:

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