JENKINS-26254 Use BufferedInputStream to read .exec files

[seanf]

https://issues.jenkins-ci.org/browse/JENKINS-26254

It doesn't seem to make much difference in an unloaded server, but hopefully it will speed up the post-build steps when Jenkins is under load.

EDIT: I've built a copy of the plugin here, if you want to risk it:
jacoco-plugin.zip

[seanf]

By the way, CoverageObjectGraphTest doesn't pass on Fedora 24, although it's okay on Windows 10. It looked like there were some minor rendering differences in the fonts when running on Fedora. Perhaps caused by the lack of subpixel rendering?

I had an SVG-based test all set, but then the SVG wasn't consistent between Fedora and Windows either. :-(

[centic9]

Thanks for the patch, I'll take a look at the test to see if anything can be done about it.

[centic9]

BTW, I could not see why the test fails, maybe you can create a separate issue and attach any error-output/details so the original author of the test can take a look?

[seanf]

Thanks @centic9. I've submitted https://issues.jenkins-ci.org/browse/JENKINS-26254.