// ASM: a very small and fast Java bytecode manipulation framework // Copyright (c) 2000-2011 INRIA, France Telecom // All rights reserved. // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions // are met: // 1. Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // 2. Redistributions in binary form must reproduce the above copyright // notice, this list of conditions and the following disclaimer in the // documentation and/or other materials provided with the distribution. // 3. Neither the name of the copyright holders nor the names of its // contributors may be used to endorse or promote products derived from // this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF // THE POSSIBILITY OF SUCH DAMAGE. package org.objectweb.asm.commons; import java.util.ArrayList; import java.util.List; import org.objectweb.asm.Attribute; import org.objectweb.asm.ByteVector; import org.objectweb.asm.ClassReader; import org.objectweb.asm.ClassWriter; import org.objectweb.asm.Label; /** * 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. */ public String algorithm; /** A list of module names. */ public List<String> modules; /** The hash of the modules in {@link #modules}. The two lists must have the same size. */ public List<byte[]> hashes; /** * 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 {@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; } }