RFR: 8270915: GIFImageReader disregards ignoreMetadata flag which causes memory exhaustion

[Jayathirth D V]

On Mon, 3 Oct 2022 22:05:14 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

> > I have updated readMedata() to also use ReaderUtil.staggeredReadByteStream() where we are allocating upfront memory based on parameters from metadata.
> 
> Probably it is possible to create a small test just for this change?

Thanks for your review Sergey.
If i need to add tests for staggered read in this PR i need to create 3 different byte streams to capture all the scenarios and these streams will not be related to this bug.
I just added staggered read approach in readMetadata() as it is now time tested and acts as a barrier for corrupt header parameters.

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PR: https://git.openjdk.org/jdk/pull/10536