tag:blogger.com,1999:blog-8236785121426515359.post111815539698978408..comments2024-03-12T13:08:46.792+01:00Comments on Ruminations: Test if uploaded file is JPEG, PNG or TIFFOle Laursenhttp://www.blogger.com/profile/11202062681718096078noreply@blogger.comBlogger13125tag:blogger.com,1999:blog-8236785121426515359.post-89448042614554198472024-01-06T16:01:48.960+01:002024-01-06T16:01:48.960+01:0036BD6
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kastamonu
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van
sakarya
V3YD<a href="https://bayanlarsitesi.com/bitlis-escort/" rel="nofollow">bitlis</a><br /><a href="https://bayanlarsitesi.com/kastamonu-escort/" rel="nofollow">kastamonu</a><br /><a href="https://bayanlarsitesi.com/corum-escort/" rel="nofollow">çorum</a><br /><a href="https://bayanlarsitesi.com/van-escort/" rel="nofollow">van</a><br /><a href="https://bayanlarsitesi.com/sakarya-escort/" rel="nofollow">sakarya</a><br />V3YDElectricVoyager666noreply@blogger.comtag:blogger.com,1999:blog-8236785121426515359.post-88191022577560627422010-12-03T01:18:19.758+01:002010-12-03T01:18:19.758+01:00Translations for Ruby:
def jpeg?(data)
retu...Translations for Ruby:<br /><br /> def jpeg?(data)<br /> return data[0,2]=="\xff\xd8"<br /> end<br /><br />To read a file from disk:<br /><br /> f = File.open(filename,'rb' # read binary<br /> data = f.read(11)<br /> f.close<br /> if jpg?(data)<br /> ext = ".jpg"<br /> end<br /><br />More magic numbers are http://www.astro.keele.ac.uk/oldusers/rno/Computing/File_magic.htmlJoel Parker Hendersonhttps://www.blogger.com/profile/15463187769856870355noreply@blogger.comtag:blogger.com,1999:blog-8236785121426515359.post-22409172968969069862010-09-17T15:49:02.731+02:002010-09-17T15:49:02.731+02:00Toni: that's an interesting idea. Here's a...Toni: that's an interesting idea. Here's a little snippet for doing it in Python:<br /><br />import subprocess<br />f = open("test.jpg", 'r')<br />data = f.read(11)<br />p = subprocess.Popen(["/usr/bin/file", "-", "--mime-type", "-b"], stdin=subprocess.PIPE)<br />print p.communicate(data)[0]<br /># outputs "image/jpeg"Ole Laursenhttps://www.blogger.com/profile/11202062681718096078noreply@blogger.comtag:blogger.com,1999:blog-8236785121426515359.post-33866257243628234132010-09-17T06:28:13.558+02:002010-09-17T06:28:13.558+02:00You don't actually need to write the file to d...You don't actually need to write the file to disk, you can just pass it thru `| file -`Toni Lähdekorpihttps://www.blogger.com/profile/11560400708795606759noreply@blogger.comtag:blogger.com,1999:blog-8236785121426515359.post-16803198398019906602009-08-11T02:10:21.356+02:002009-08-11T02:10:21.356+02:00Just what I was looking for- thanks for sharing.Just what I was looking for- thanks for sharing.rs238noreply@blogger.comtag:blogger.com,1999:blog-8236785121426515359.post-58558374289002541322009-07-03T11:54:42.790+02:002009-07-03T11:54:42.790+02:00Cool! Glad you can use it. :)Cool! Glad you can use it. :)Ole Laursenhttps://www.blogger.com/profile/11202062681718096078noreply@blogger.comtag:blogger.com,1999:blog-8236785121426515359.post-22825005845531449022009-07-03T06:23:00.287+02:002009-07-03T06:23:00.287+02:00Thank you, Ole, for a very useful piece of code! ...Thank you, Ole, for a very useful piece of code! It'll be in the next version of sqlpython to allow browsing of image BLOBs straight from the database.<br /><br />As for UNIX's `file`... that's nice, but I don't believe it exists on windows, so no use for a cross-platform app!Anonymoushttps://www.blogger.com/profile/12229578427522022392noreply@blogger.comtag:blogger.com,1999:blog-8236785121426515359.post-68002293803737529302009-06-05T12:45:24.542+02:002009-06-05T12:45:24.542+02:00Well, file is neat and I did consider it, but it w...Well, file is neat and I did consider it, but it won't work unless you already have the file on disk (despite my example, I would like to get the name right before I write it) and it's harder to reason about (can file crash? what can go wrong when you use os.system?).<br /><br />Also, using os.system in a web app is a bit scary, you have to double check that no user entered data can ever end up in the command, at least not unescaped.<br /><br />So that's why. :)<br /><br />I recently found out you can feed data in chunks to the Python Imaging Library, so another possibility is to feed it one chunk and see what happens.Ole Laursenhttps://www.blogger.com/profile/11202062681718096078noreply@blogger.comtag:blogger.com,1999:blog-8236785121426515359.post-74974709870864796272009-06-04T12:23:27.977+02:002009-06-04T12:23:27.977+02:00i guess one shouldn't reinvent the wheel... wh...i guess one shouldn't reinvent the wheel... why not use the "file" command for this?<br /><br />> file IMG_0019.JPG<br /><br />IMG_0019.JPG: JPEG image data, EXIF standard<br /><br />os.system("...") should do the workMalte Nuhnnoreply@blogger.com