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/*
* This file is available under and governed by the GNU General Public
* License version 2 only, as published by the Free Software Foundation.
* However, the following notice accompanied the original version of this
* file:
*
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000-2011 INRIA, France Telecom
* All rights reserved.
*
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* modification, are permitted provided that the following conditions
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package jdk.internal.org.objectweb.asm.commons;
import java.util.ArrayList;
import java.util.List;
import jdk.internal.org.objectweb.asm.Attribute;
import jdk.internal.org.objectweb.asm.ByteVector;
import jdk.internal.org.objectweb.asm.ClassReader;
import jdk.internal.org.objectweb.asm.ClassWriter;
import jdk.internal.org.objectweb.asm.Label;
ModuleHashes attribute.
This attribute is specific to the OpenJDK and may change in the future.
Author: Remi Forax
/**
* ModuleHashes attribute.
* This attribute is specific to the OpenJDK and may change in the future.
*
* @author Remi Forax
*/
public final class ModuleHashesAttribute extends Attribute {
public String algorithm;
public List<String> modules;
public List<byte[]> hashes;
Creates an attribute with a hashing algorithm, a list of module names,
and a list of the same length of hashes.
Params: - algorithm – the hashing algorithm name.
- modules – a list of module name
- hashes – a list of hash, one for each module name.
/**
* Creates an attribute with a hashing algorithm, a list of module names,
* and a list of the same length of hashes.
* @param algorithm the hashing algorithm name.
* @param modules a list of module name
* @param hashes a list of hash, one for each module name.
*/
public ModuleHashesAttribute(final String algorithm,
final List<String> modules, final List<byte[]> hashes) {
super("ModuleHashes");
this.algorithm = algorithm;
this.modules = modules;
this.hashes = hashes;
}
Creates an empty attribute that can be used as prototype to be passed as argument of the method ClassReader.accept(ClassVisitor, Attribute[], int). /**
* Creates an empty attribute that can be used as prototype
* to be passed as argument of the method
* {@link ClassReader#accept(org.objectweb.asm.ClassVisitor, Attribute[], int)}.
*/
public ModuleHashesAttribute() {
this(null, null, null);
}
@Override
protected Attribute read(ClassReader cr, int off, int len, char[] buf,
int codeOff, Label[] labels) {
String hashAlgorithm = cr.readUTF8(off, buf);
int count = cr.readUnsignedShort(off + 2);
ArrayList<String> modules = new ArrayList<String>(count);
ArrayList<byte[]> hashes = new ArrayList<byte[]>(count);
off += 4;
for (int i = 0; i < count; i++) {
String module = cr.readModule(off, buf);
int hashLength = cr.readUnsignedShort(off + 2);
off += 4;
byte[] hash = new byte[hashLength];
for (int j = 0; j < hashLength; j++) {
hash[j] = (byte) (cr.readByte(off + j) & 0xff);
}
off += hashLength;
modules.add(module);
hashes.add(hash);
}
return new ModuleHashesAttribute(hashAlgorithm, modules, hashes);
}
@Override
protected ByteVector write(ClassWriter cw, byte[] code, int len,
int maxStack, int maxLocals) {
ByteVector v = new ByteVector();
int index = cw.newUTF8(algorithm);
v.putShort(index);
int count = (modules == null)? 0: modules.size();
v.putShort(count);
for(int i = 0; i < count; i++) {
String module = modules.get(i);
v.putShort(cw.newModule(module));
byte[] hash = hashes.get(i);
v.putShort(hash.length);
for(byte b: hash) {
v.putByte(b);
}
}
return v;
}
}