Minor Zip related changes to reduce allocation hotspots

[parentjo]

• Convert ZipFile and ZipOutputStream to use above mentioned methods to avoid object alloction hotspot (jprofiler) especially for large jars.
• Create sufficiently large HashTable right away for all entries to avoid resizing penalty with large jars (like weblogic.jar ...)
• Replace ArrayList with LinkedList to reduce alloc-copy overhead when creating large INDEX.LST file
• Introduce Calendar per thread (with ThreadLocal) to avoid creating a new Calendar when creating the Date for every ZipEntry
• Misc: move array allocation out of loop when possible

[ifedorenko]

Can you check/fix your end-of-line configuration, as explained in https://help.github.com/articles/dealing-with-line-endings ? Hard to review diffs when entire file shows as changed ;-)

[parentjo]

ok gave it a try but I'll likely to make lots of git newbie mistakes. If so sorry

[krosenvold]

Applied in 845587d, thanks for the patch!

Btw; are you /really/ sure the relative overhead of a thread local vs new-ing a Calendar ?