1 /*
2 * Copyright (c) 2003, 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 */
67 {
68 // hack for now, just assume the stream will fit in our reasonable size buffer.
69 // if not, panic
70 int bufferLimit = 200 * 1024;
71 byte[] readBuffer = new byte[bufferLimit];
72 int actualSize = stream.read(readBuffer);
73 if ( actualSize >= bufferLimit )
74 {
75 // if there might be more bytes, just surrender
76 throw new IOException("too big for buffer");
77 }
78
79 byte[] resultBuffer = new byte[actualSize];
80 System.arraycopy( readBuffer,
81 0,
82 resultBuffer,
83 0,
84 actualSize);
85 return resultBuffer;
86 }
87 }
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1 /*
2 * Copyright (c) 2003, 2019, 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 */
67 {
68 // hack for now, just assume the stream will fit in our reasonable size buffer.
69 // if not, panic
70 int bufferLimit = 200 * 1024;
71 byte[] readBuffer = new byte[bufferLimit];
72 int actualSize = stream.read(readBuffer);
73 if ( actualSize >= bufferLimit )
74 {
75 // if there might be more bytes, just surrender
76 throw new IOException("too big for buffer");
77 }
78
79 byte[] resultBuffer = new byte[actualSize];
80 System.arraycopy( readBuffer,
81 0,
82 resultBuffer,
83 0,
84 actualSize);
85 return resultBuffer;
86 }
87
88 static final String DEST = System.getProperty("test.classes");
89 static final boolean VERBOSE = false;
90
91 static boolean checkMatch(byte[] buf, byte[] name, int begIdx) {
92 if (buf.length < name.length + begIdx) {
93 return false;
94 }
95 for (int i = 0; i < name.length; i++) {
96 if (buf[i + begIdx] != name[i]) {
97 return false;
98 }
99 }
100 return true;
101 }
102
103 // This function reads a class file from disk and replaces the first character of
104 // the name with the one passed as "replace". Then goes through the bytecodes to
105 // replace all instances of the name of the class with the new name. The
106 // redefinition tests use this to redefine Host$ classes with precompiled class files
107 // Xost.java, Yost.java and Zost.java.
108 static byte[]
109 bytesForHostClass(char replace, String className) throws Throwable {
110 String tail = className.substring(1);
111 String origClassName = "" + replace + tail;
112 File clsfile = new File(DEST + "/" + origClassName + ".class");
113
114 if (VERBOSE) {
115 System.out.println(" Reading bytes from " + clsfile);
116 }
117 byte[] buf = null;
118 try (FileInputStream str = new FileInputStream(clsfile)) {
119 buf = loadBufferFromStream(str);
120 }
121
122 boolean found = false;
123 int dollarSignIdx = className.indexOf('$');
124 int ptrnLen = (dollarSignIdx == -1) ? className.length() : dollarSignIdx;
125 byte[] ptrnBytes = origClassName.substring(0, ptrnLen).getBytes();
126 byte firstByte = className.getBytes()[0];
127
128 for (int i = 0; i < buf.length - ptrnLen; i++) {
129 if (checkMatch(buf, ptrnBytes, i)) {
130 if (VERBOSE) {
131 System.out.println("Appear to have found " + origClassName + " starting at " + i);
132 }
133 buf[i] = firstByte;
134 found = true;
135 }
136 }
137 if (!found) {
138 throw new Error("Could not locate '" + ptrnBytes + "' name in byte array");
139 }
140 return buf;
141 }
142 }
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