Tighten bounds checking for InStream.c.  Disallow Seek() to file position outside of file.   Don't allow Reopen() with illegal offset and length.  Don't allow read_bytes to access memory outside of file.  (LUCY-101)
Tighten bounds checking for InStream.c.  Disallow Seek() to file position
outside of file.   Don't allow Reopen() with illegal offset and length.  Don't
allow read_bytes to access memory outside of file.  (LUCY-101)


git-svn-id: cb1f56016b938a9eb977ee3833dcaa0292d8bc39@916259 13f79535-47bb-0310-9956-ffa450edef68

apache/lucy,kidaa/lucy,rbevers/lucy,apache/lucy,kidaa/lucy,apache/lucy,apache/lucy,kidaa/lucy,pombredanne/apache-lucy,nwellnhof/lucy,nwellnhof/lucy,kidaa/lucy,rectang/lucy,nwellnhof/lucy,nwellnhof/lucy,rectang/lucy,rbevers/lucy,pombredanne/apache-lucy,kidaa/lucy,rectang/lucy,nwellnhof/lucy,pombredanne/apache-lucy,rbevers/lucy,kidaa/lucy,rectang/lucy,pombredanne/apache-lucy,kidaa/lucy,apache/lucy,rbevers/lucy,rectang/lucy,rectang/lucy,rectang/lucy,nwellnhof/lucy,pombredanne/apache-lucy,rbevers/lucy,kidaa/lucy,apache/lucy,pombredanne/apache-lucy,rbevers/lucy,nwellnhof/lucy,pombredanne/apache-lucy,apache/lucy,rbevers/lucy