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84 lines
2.7 KiB
Java
84 lines
2.7 KiB
Java
/*
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* Copyright (c) 2000, 2018, 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.
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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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*/
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package sun.jvm.hotspot.utilities;
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import java.io.*;
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import java.nio.charset.Charset;
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import java.util.*;
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import sun.jvm.hotspot.debugger.*;
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/** A utility class encapsulating useful operations on C strings
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represented as Addresses */
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public class CStringUtilities {
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/** Return the length of a null-terminated ASCII string in the
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remote process */
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public static int getStringLength(Address addr) {
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int i = 0;
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while (addr.getCIntegerAt(i, 1, false) != 0) {
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i++;
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}
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return i;
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}
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private static String encoding = System.getProperty("file.encoding", "US-ASCII");
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public static String getString(Address addr) {
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return getString(addr, Charset.forName(encoding));
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}
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/** Fetch a null-terminated ASCII string from the remote process.
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Returns null if the argument is null, otherwise returns a
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non-null string (for example, returns an empty string if the
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first character fetched is the null terminator). */
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public static String getString(Address addr, Charset charset) {
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if (addr == null) {
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return null;
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}
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List data = new ArrayList();
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byte val = 0;
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long i = 0;
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do {
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val = (byte) addr.getCIntegerAt(i, 1, false);
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if (val != 0) {
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data.add(new Byte(val));
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}
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++i;
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} while (val != 0);
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// Convert to byte[] and from there to String
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byte[] bytes = new byte[data.size()];
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for (i = 0; i < data.size(); ++i) {
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bytes[(int) i] = ((Byte) data.get((int) i)).byteValue();
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}
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// FIXME: When we switch to use JDK 6 to build SA,
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// we can change the following to just return:
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// return new String(bytes, Charset.defaultCharset());
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return new String(bytes, charset);
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}
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}
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