[Graphics-drawRGB]Help!!!! - What's the result of drawRGB under this case???

[micojade]

Gurus,

For the following API call when writing a drawRGB,
drawRGB(int[] rgbData, int offset, int scanlength, int x, int y, int width, int height, boolean processAlpha)

If we give -1 or -2 such kind of negative value to the parameter heigth in above API call, what should be the result? Should we get some exception or no exception at all???

Please kindly help me!!!! No such info from the document spec?!

[grahamhughes]

There is no defined behaviour for the circumstance you describe. You might get an exception. Then again, you might not.

I suggest you never pass a negative value for height...

Graham.

[micojade]

Thanks for your reply. But no defined behaviour is not a good way. Normal flow is what we usually do, but hacker can use the attacking way to make it a mess. Because it did not say people cannot give a negative value that is the problem.... A bit confused here.

[micojade]

so this way, how to solve this kind of issue?

[raj_J2ME]

Well if you are making a call to the asked method so simply you can also test the same and in turn you can also know the results, here one has to write the code and then has to test the same. AFIK you must get an exception.

Why don't you go ahead and test the same.?

[micojade]

Just want to know what should be the defined behaviour. For the testing done here, it did not throw exception

[raj_J2ME]

Just want to know what should be the defined behaviour. For the testing done here, it did not throw exception

Parameters:
rgbData - an array of ARGB values in the format 0xAARRGGBB
offset - the array index of the first ARGB value
scanlength - the relative array offset between the corresponding pixels in consecutive rows in the rgbData array
x - the horizontal location of the region to be rendered
y - the vertical location of the region to be rendered
width - the width of the region to be rendered
height - the height of the region to be rendered
processAlpha - true if rgbData has an alpha channel, false if all pixels are fully opaque
Throws:
ArrayIndexOutOfBoundsException - if the requested operation will attempt to access an element of rgbData whose index is either negative or beyond its length
NullPointerException - if rgbData is null

As you can read the above thrown exception which are both realated to the rgb data only and hence that verify the tesrting you have done.

[grahamhughes]

so this way, how to solve this kind of issue?

Solve it by not passing inappropriate values. What exactly is the problem?

Graham.