beedae1141
Co-authored-by: Lutz Schmidt <lucy@openjdk.org> Co-authored-by: Martin Doerr <mdoerr@openjdk.org> Reviewed-by: kvn, lucy, rriggs
88 lines
2.8 KiB
Java
88 lines
2.8 KiB
Java
/*
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* Copyright (c) 2000, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.lang;
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import jdk.internal.vm.annotation.IntrinsicCandidate;
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/**
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* Utility class for string encoding and decoding.
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*/
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class StringCoding {
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private StringCoding() { }
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public static boolean hasNegatives(byte[] ba, int off, int len) {
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return countPositives(ba, off, len) != len;
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}
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/**
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* Count the number of leading positive bytes in the range.
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*
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* @implSpec the implementation must return len if there are no negative
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* bytes in the range. If there are negative bytes, the implementation must return
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* a value that is less than or equal to the index of the first negative byte
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* in the range.
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*/
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@IntrinsicCandidate
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public static int countPositives(byte[] ba, int off, int len) {
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int limit = off + len;
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for (int i = off; i < limit; i++) {
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if (ba[i] < 0) {
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return i - off;
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}
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}
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return len;
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}
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@IntrinsicCandidate
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public static int implEncodeISOArray(byte[] sa, int sp,
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byte[] da, int dp, int len) {
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int i = 0;
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for (; i < len; i++) {
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char c = StringUTF16.getChar(sa, sp++);
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if (c > '\u00FF')
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break;
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da[dp++] = (byte)c;
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}
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return i;
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}
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@IntrinsicCandidate
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public static int implEncodeAsciiArray(char[] sa, int sp,
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byte[] da, int dp, int len)
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{
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int i = 0;
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for (; i < len; i++) {
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char c = sa[sp++];
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if (c >= '\u0080')
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break;
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da[dp++] = (byte)c;
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}
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return i;
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}
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}
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