1 /* 2 * Copyright (c) 2000, 2006, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.utilities; 26 27 import java.io.*; 28 import java.util.*; 29 30 import sun.jvm.hotspot.debugger.*; 31 32 /** A utility class encapsulating useful operations on C strings 33 represented as Addresses */ 34 35 public class CStringUtilities { 36 /** Return the length of a null-terminated ASCII string in the 37 remote process */ 38 public static int getStringLength(Address addr) { 39 int i = 0; 40 while (addr.getCIntegerAt(i, 1, false) != 0) { 41 i++; 42 } 43 return i; 44 } 45 46 private static String encoding = System.getProperty("file.encoding", "US-ASCII"); 47 48 /** Fetch a null-terminated ASCII string from the remote process. 49 Returns null if the argument is null, otherwise returns a 50 non-null string (for example, returns an empty string if the 51 first character fetched is the null terminator). */ 52 public static String getString(Address addr) { 53 if (addr == null) { 54 return null; 55 } 56 57 List data = new ArrayList(); 58 byte val = 0; 59 long i = 0; 60 do { 61 val = (byte) addr.getCIntegerAt(i, 1, false); 62 if (val != 0) { 63 data.add(new Byte(val)); 64 } 65 ++i; 66 } while (val != 0); 67 68 // Convert to byte[] and from there to String 69 byte[] bytes = new byte[data.size()]; 70 for (i = 0; i < data.size(); ++i) { 71 bytes[(int) i] = ((Byte) data.get((int) i)).byteValue(); 72 } 73 // FIXME: When we switch to use JDK 6 to build SA, 74 // we can change the following to just return: 75 // return new String(bytes, Charset.defaultCharset()); 76 try { 77 return new String(bytes, encoding); 78 } catch (UnsupportedEncodingException e) { 79 throw new RuntimeException("Error converting bytes to String using " + encoding + " encoding", e); 80 } 81 } 82 } | 1 /* 2 * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.utilities; 26 27 import java.io.*; 28 import java.nio.charset.Charset; 29 import java.util.*; 30 31 import sun.jvm.hotspot.debugger.*; 32 33 /** A utility class encapsulating useful operations on C strings 34 represented as Addresses */ 35 36 public class CStringUtilities { 37 /** Return the length of a null-terminated ASCII string in the 38 remote process */ 39 public static int getStringLength(Address addr) { 40 int i = 0; 41 while (addr.getCIntegerAt(i, 1, false) != 0) { 42 i++; 43 } 44 return i; 45 } 46 47 private static String encoding = System.getProperty("file.encoding", "US-ASCII"); 48 49 public static String getString(Address addr) { 50 return getString(addr, Charset.forName(encoding)); 51 } 52 53 /** Fetch a null-terminated ASCII string from the remote process. 54 Returns null if the argument is null, otherwise returns a 55 non-null string (for example, returns an empty string if the 56 first character fetched is the null terminator). */ 57 public static String getString(Address addr, Charset charset) { 58 if (addr == null) { 59 return null; 60 } 61 62 List data = new ArrayList(); 63 byte val = 0; 64 long i = 0; 65 do { 66 val = (byte) addr.getCIntegerAt(i, 1, false); 67 if (val != 0) { 68 data.add(new Byte(val)); 69 } 70 ++i; 71 } while (val != 0); 72 73 // Convert to byte[] and from there to String 74 byte[] bytes = new byte[data.size()]; 75 for (i = 0; i < data.size(); ++i) { 76 bytes[(int) i] = ((Byte) data.get((int) i)).byteValue(); 77 } 78 // FIXME: When we switch to use JDK 6 to build SA, 79 // we can change the following to just return: 80 // return new String(bytes, Charset.defaultCharset()); 81 return new String(bytes, charset); 82 } 83 } |