Here is what I came up with. It checks to see if the Jpg has the final
necessary bytes. I'm open to better suggestions, but this covers what
I need for now. It worked with the few corrupt images I had to test.
I put the same thing in a blog post on our site:
http://blog.mediarain.com/2010/02/checking-in-flexas3-for-corrupt-jpgs-invalid-images/
protected function isValid(bytes:ByteArray):Boolean
{
var toReturn:Boolean = true;
//take the file name and check it against jpg extensions to make
sure it is a jpg
var namePieces:Array = file.name.split(".");
//I'm getting the file extension this lame way, bc for some reason
file.type is null
var extension:String = namePieces[namePieces.length -1];
//if it is indeed a jpeg then we want to check the
validity
if(extension.toLowerCase() == 'jpg' || extension.toLowerCase() ==
'jpeg')
{
//move to the second to last position in the
bytearray
bytes.position = bytes.bytesAvailable - 2;
//get the last two bytes
var secondToLastByte:uint =
bytes.readUnsignedByte();
var lastByte:uint = bytes.readUnsignedByte();
//if the last two bytes don't match the EOI segment header at the
end of the file
//then we know it is invalid
if(secondToLastByte != 255 || lastByte != 217)
{
toReturn = false;
}
}
return toReturn;
}
Hopefully this can help somebody else as well.
On Feb 25, 2010, at 10:47 AM, brycebarrand wrote:
I'm working on an app where I want to check in Flex, before
uploading, if a jpg is corrupt or valid.
Before I reinvent the wheel, I was wondering if someone had
something like this already written. I checked the forums and didn't
see anything...
In the meantime I'll start working on it, and post what I come up
with :)
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