RFR: 8282395: URL.openConnection can throw IOOBE

[KIRIYAMA Takuya]

I fixed sun.net.www.ParseUtil.decode().

ParseUtil.decode() always tries to decode after parsing '%', so if '%' is located at the end of the String, IndexOutOfBoundsException is thrown. Also, if '%' is shown after decodable string and following string is not decodable (e.g: "%25%s%G1"), ParseUtil.decode() throws IllegalArgumentException.

But URL standard says below (https://url.spec.whatwg.org/#percent-decode).


Otherwise, if byte is 0x25 (%) and the next two bytes after byte in input are not in the ranges 
0x30 (0) to 0x39 (9), 0x41 (A) to 0x46 (F), and 0x61 (a) to 0x66 (f), all inclusive, append byte to output.


So, there should be used isEscaped() to judge to decode.

Would you please review this fix?

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Commit messages:
 - 8282395: URL.openConnection can throw IOOBE

Changes: https://git.openjdk.java.net/jdk/pull/8155/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8155&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282395
  Stats: 48 lines in 2 files changed: 45 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8155.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8155/head:pull/8155

PR: https://git.openjdk.java.net/jdk/pull/8155