Similar to ObjectInputStream, use JLA.countPositives and JLA.inflateBytesToChars to speed up readUTF
------------- Commit messages: - suggestion from @liach - optimize for ascii - only allocate the char array if we have non-ascii - optimize DataOutputStream::readUTF Changes: https://git.openjdk.org/jdk/pull/20903/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20903&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8340232 Stats: 42 lines in 1 file changed: 28 ins; 2 del; 12 mod Patch: https://git.openjdk.org/jdk/pull/20903.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/20903/head:pull/20903 PR: https://git.openjdk.org/jdk/pull/20903
