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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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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;

A ModuleHashes attribute. This attribute is specific to the OpenJDK and may change in the future.
Author:Remi Forax
/** * A ModuleHashes attribute. This attribute is specific to the OpenJDK and may change in the future. * * @author Remi Forax */
public final class ModuleHashesAttribute extends Attribute {
The name of the hashing algorithm.
/** The name of the hashing algorithm. */
public String algorithm;
A list of module names.
/** A list of module names. */
public List<String> modules;
The hash of the modules in modules. The two lists must have the same size.
/** The hash of the modules in {@link #modules}. The two lists must have the same size. */
public List<byte[]> hashes;
Constructs a new ModuleHashesAttribute.
Params:
  • algorithm – the name of the hashing algorithm.
  • modules – a list of module names.
  • hashes – the hash of the modules in 'modules'. The two lists must have the same size.
/** * Constructs a new {@link ModuleHashesAttribute}. * * @param algorithm the name of the hashing algorithm. * @param modules a list of module names. * @param hashes the hash of the modules in 'modules'. The two lists must have the same size. */
public ModuleHashesAttribute( final String algorithm, final List<String> modules, final List<byte[]> hashes) { super("ModuleHashes"); this.algorithm = algorithm; this.modules = modules; this.hashes = hashes; }
Constructs an empty ModuleHashesAttribute. This object can be passed as a prototype to the ClassReader.accept(ClassVisitor, Attribute[], int) method.
/** * Constructs an empty {@link ModuleHashesAttribute}. This object can be passed as a prototype to * the {@link ClassReader#accept(org.objectweb.asm.ClassVisitor, Attribute[], int)} method. */
public ModuleHashesAttribute() { this(null, null, null); } @Override protected Attribute read( final ClassReader classReader, final int offset, final int length, final char[] charBuffer, final int codeAttributeOffset, final Label[] labels) { int currentOffset = offset; String hashAlgorithm = classReader.readUTF8(currentOffset, charBuffer); currentOffset += 2; int numModules = classReader.readUnsignedShort(currentOffset); currentOffset += 2; ArrayList<String> moduleList = new ArrayList<>(numModules); ArrayList<byte[]> hashList = new ArrayList<>(numModules); for (int i = 0; i < numModules; ++i) { String module = classReader.readModule(currentOffset, charBuffer); currentOffset += 2; moduleList.add(module); int hashLength = classReader.readUnsignedShort(currentOffset); currentOffset += 2; byte[] hash = new byte[hashLength]; for (int j = 0; j < hashLength; ++j) { hash[j] = (byte) (classReader.readByte(currentOffset) & 0xFF); currentOffset += 1; } hashList.add(hash); } return new ModuleHashesAttribute(hashAlgorithm, moduleList, hashList); } @Override protected ByteVector write( final ClassWriter classWriter, final byte[] code, final int codeLength, final int maxStack, final int maxLocals) { ByteVector byteVector = new ByteVector(); byteVector.putShort(classWriter.newUTF8(algorithm)); if (modules == null) { byteVector.putShort(0); } else { int numModules = modules.size(); byteVector.putShort(numModules); for (int i = 0; i < numModules; ++i) { String module = modules.get(i); byte[] hash = hashes.get(i); byteVector .putShort(classWriter.newModule(module)) .putShort(hash.length) .putByteArray(hash, 0, hash.length); } } return byteVector; } }