Ali: It’s 8 + number of components * 3, see the numbered list in the post. Count the bytes in the image with the hex and i think you’ll see how it’s built up

Zari: Unfortunately this only supports reading the meta data of a jpg, not the actual pixel data A similar approach could probably be applied to achieve what you want though, but it would get more complicated

Thanks for the really great information pal, but how did you get that the length(0×11) is 17 bytes!? on what base did you calculated the bytes (8 + 3×3 as we’re assuming it’s an RGB image)

Is there a way to get more info about the photos and files binary data and in what base identifiers get together or something like that?

Thanks

I want to ask you, can I use this library for not commercial project.
I create data dispetcher, when I load JPG and another files like tasks, and I wont get JPG size before loading

Now, this is project is used by only me, but I’m thinking about sharing

private static function getImageSize_JPEG(data: ByteArray): Point {
if (data.length < 4) return null;
data.endian = Endian.BIG_ENDIAN;
data.position = 0;

var magic : uint;
var marker : uint;
var length : uint;
var x : uint;
var y : uint;

magic = data.readUnsignedShort();
marker = data.readUnsignedShort();
if (magic != 0xFFD8) return null;

while(data.position < data.length – 1) {
switch(marker) {
case 0xFFC0:
data.position += 3;
y = data.readUnsignedShort();
x = data.readUnsignedShort();
return new Point(x, y);

default:
length = data.readUnsignedShort() – 2;
data.position += length;
marker = data.readUnsignedShort();
break;
}
}

return null;
}