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add more information about how to ignore invalid rotation values in input images

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Johannes Schauer Marin Rodrigues 2022-02-06 20:33:30 +01:00
parent 6cff2931e4
commit 3da370d3bd
Signed by untrusted user: josch
GPG key ID: F2CBA5C78FBD83E1
2 changed files with 19 additions and 4 deletions
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9
README.md
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@ -82,7 +82,10 @@ Bugs
only nine different values from 1 to 9 are permitted, Anroid phones and
Canon DSLR cameras produce JPEG images with the invalid value of zero.
Either fix your input images with `exiftool` or similar software before
passing the JPEG to `img2pdf` or run `img2pdf` with `--rotation=ifvalid`.
passing the JPEG to `img2pdf` or run `img2pdf` with `--rotation=ifvalid`
(if you run img2pdf from the commandline) or by passing
`rotation=img2pdf.Rotation.ifvalid` as an argument to `convert()` when using
img2pdf as a library.
- img2pdf uses PIL (or Pillow) to obtain image meta data and to convert the
input if necessary. To prevent decompression bomb denial of service attacks,
@ -191,6 +194,10 @@ The package can also be used as a library:
with open("name.pdf","wb") as f:
f.write(img2pdf.convert(glob.glob("/path/to/*.jpg")))
# ignore invalid rotation values in the input images
with open("name.pdf","wb") as f:
f.write(img2pdf.convert('test.jpg'), rotation=img2pdf.Rotation.ifvalid)
# writing to file descriptor
with open("name.pdf","wb") as f1, open("test.jpg") as f2:
img2pdf.convert(f2, outputstream=f1)

14
src/img2pdf.py
View file

@ -1277,17 +1277,25 @@ def get_imgmetadata(
elif value in (2, 4, 5, 7):
if rotreq == Rotation.ifvalid:
logger.warning(
"Unsupported flipped rotation mode (%d)", value
"Unsupported flipped rotation mode (%d): use "
"--rotation=ifvalid or "
"rotation=img2pdf.Rotation.ifvalid to ignore",
value,
)
else:
raise ExifOrientationError(
"Unsupported flipped rotation mode (%d)" % value
"Unsupported flipped rotation mode (%d): use "
"--rotation=ifvalid or "
"rotation=img2pdf.Rotation.ifvalid to ignore" % value
)
else:
if rotreq == Rotation.ifvalid:
logger.warning("Invalid rotation (%d)", value)
else:
raise ExifOrientationError("Invalid rotation (%d)" % value)
raise ExifOrientationError(
"Invalid rotation (%d): use --rotation=ifvalid "
"or rotation=img2pdf.Rotation.ifvalid to ignore" % value
)
elif rotreq in (Rotation.none, Rotation["0"]):
rotation = 0
elif rotreq == Rotation["90"]: