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/*
* Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.io.*;
/*
* Copyright 2003 Wily Technology, Inc.
*/
public class NamedBuffer
{
private final String fName;
private final byte[] fBuffer;
public
NamedBuffer( String name,
byte[] buffer)
{
fName = name;
fBuffer = buffer;
}
public
NamedBuffer( String name,
InputStream stream)
throws IOException
{
this( name,
loadBufferFromStream(stream));
}
public String
getName()
{
return fName;
}
public byte[]
getBuffer()
{
return fBuffer;
}
public static byte[]
loadBufferFromStream(InputStream stream)
throws IOException
{
// hack for now, just assume the stream will fit in our reasonable size buffer.
// if not, panic
int bufferLimit = 200 * 1024;
byte[] readBuffer = new byte[bufferLimit];
int actualSize = stream.read(readBuffer);
if ( actualSize >= bufferLimit )
{
// if there might be more bytes, just surrender
throw new IOException("too big for buffer");
}
byte[] resultBuffer = new byte[actualSize];
System.arraycopy( readBuffer,
0,
resultBuffer,
0,
actualSize);
return resultBuffer;
}
static final String DEST = System.getProperty("test.classes");
static final boolean VERBOSE = false;
static boolean checkMatch(byte[] buf, byte[] name, int begIdx) {
if (buf.length < name.length + begIdx) {
return false;
}
for (int i = 0; i < name.length; i++) {
if (buf[i + begIdx] != name[i]) {
return false;
}
}
return true;
}
// This function reads a class file from disk and replaces the first character of
// the name with the one passed as "replace". Then goes through the bytecodes to
// replace all instances of the name of the class with the new name. The
// redefinition tests use this to redefine Host$ classes with precompiled class files
// Xost.java, Yost.java and Zost.java.
static byte[]
bytesForHostClass(char replace, String className) throws Throwable {
String tail = className.substring(1);
String origClassName = "" + replace + tail;
File clsfile = new File(DEST + "/" + origClassName + ".class");
if (VERBOSE) {
System.out.println(" Reading bytes from " + clsfile);
}
byte[] buf = null;
try (FileInputStream str = new FileInputStream(clsfile)) {
buf = loadBufferFromStream(str);
}
boolean found = false;
int dollarSignIdx = className.indexOf('$');
int ptrnLen = (dollarSignIdx == -1) ? className.length() : dollarSignIdx;
byte[] ptrnBytes = origClassName.substring(0, ptrnLen).getBytes();
byte firstByte = className.getBytes()[0];
for (int i = 0; i < buf.length - ptrnLen; i++) {
if (checkMatch(buf, ptrnBytes, i)) {
if (VERBOSE) {
System.out.println("Appear to have found " + origClassName + " starting at " + i);
}
buf[i] = firstByte;
found = true;
}
}
if (!found) {
throw new Error("Could not locate '" + ptrnBytes + "' name in byte array");
}
return buf;
}
}
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