CODEWITHSUNDEEP
phpbase64
S.Gia
S.Gia

Reputation: 336

PHP base64_decode yields invalid image file

my problem:

I am saving an uploaded base64 string to a file using PHP. This string comes from an iPhone app and is a base64 encoded jpeg file.

When I take the contents of this file and add it manually to a data src in an image tag, it displays CORRECTLY. When I read it using file_get_contents and add the resulting string to an img data tag, it works CORRECTLY.

My issue: when I read the file using file_get_contents and save the results using base64_decode(), the resulting jpeg file is INVALID.

My question is, why does the obviously valid base64 encoded string not yield a valid JPEG file when decoded and saved?

Some source excerpts:

This functions as it should, outputs the image:

$imagepath = "D:\\path\\to\\image\\mybase64image.txt";
$imagecontent = file_get_contents($imagepath);
header("Content-type:text/html");
$d = '<img alt="" src="data:image/jpeg;base64,' . $imagecontent . '"/>';
echo $d;

This, does NOT work and the file is invalid:

$imagepath = "D:\\path\\to\\image\\mybase64image.txt";
$imagecontent = file_get_contents($imagepath);
file_put_contents('img.jpg', base64_decode($imagecontent));

-- img.jpg is an invalid file. The paths are valid, the file is there, permissions are there as well (the resulting file img.jpg is a binary file, just invalid) and as I said, it works as a data src.

Here is the base64 encoded file:

http://www.mailnet.de/7E072017-DAEB-41E1-B02E-23FB51A05B80.txt

Any help is appreciated.

Upvotes: 1

Views: 1344

Answers (1)

nice ass
nice ass

Reputation: 16709

% characters are not allowed in the b64 set. It looks like your string is url-encoded. urldecode() it before passing it to base64_decode().

It works in the browser like it is because they always decode url attributes.

Upvotes: 1

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