fix possible buffer overrun and memory leak

Use snprintf instead of sprintf and fclose() before return.

Change-Id: I3ed193464cc0dc90e9935ae19162667ad367628b
Reimplement ZipFileRO in terms of libziparchive.

This lets us share zip archive processing code with both
the runtime (Art, dalvik) and critical java code
(StrictJarFile).

This change also moves several utility methods to ZipUtils
and dedups code across several zip inflation methods.

One of the side effects of this change is that several
processing loops are now O(n) instead of O(n^2).

bug: 10193060

Change-Id: I3c7188496837a47246c4f342e45485a70fef3169
Merge "fix possible buffer overrun and memory leak"
Merge "Reimplement ZipFileRO in terms of libziparchive."