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Diffstat (limited to 'src/proguard/classfile/editor/InterfaceDeleter.java')
| -rw-r--r-- | src/proguard/classfile/editor/InterfaceDeleter.java | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/src/proguard/classfile/editor/InterfaceDeleter.java b/src/proguard/classfile/editor/InterfaceDeleter.java new file mode 100644 index 0000000..6fd22b6 --- /dev/null +++ b/src/proguard/classfile/editor/InterfaceDeleter.java @@ -0,0 +1,190 @@ +/* + * ProGuard -- shrinking, optimization, obfuscation, and preverification + * of Java bytecode. + * + * Copyright (c) 2002-2014 Eric Lafortune (eric@graphics.cornell.edu) + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program 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 for + * more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +package proguard.classfile.editor; + +import proguard.classfile.*; +import proguard.classfile.attribute.*; +import proguard.classfile.attribute.visitor.AttributeVisitor; +import proguard.classfile.constant.Utf8Constant; +import proguard.classfile.util.*; +import proguard.classfile.visitor.ClassVisitor; + +import java.util.Arrays; + +/** + * This ClassVisitor removes specified interfaces from the classes and class + * signatures that it visits. + * + * @author Eric Lafortune + */ +public class InterfaceDeleter +extends SimplifiedVisitor +implements ClassVisitor, + AttributeVisitor +{ + private static final boolean DEBUG = false; + + + private final boolean[] delete; + + + /** + * Creates a new InterfaceDeleter to remove the specified interfaces. + * @param delete an array that corresponds to the interfaces of a class + * and that specifies the ones to be removed. + */ + public InterfaceDeleter(boolean[] delete) + { + this.delete = delete; + } + + + // Implementations for ClassVisitor. + + public void visitProgramClass(ProgramClass programClass) + { + int[] interfaces = programClass.u2interfaces; + int interfacesCount = programClass.u2interfacesCount; + + if (DEBUG) + { + System.out.println("InterfaceDeleter: "+programClass.getName()+" ("+interfacesCount+" interfaces)"); + } + + // Copy the interfaces that aren't deleted. + int newInterfacesCount = 0; + for (int index = 0; index < interfacesCount; index++) + { + if (DEBUG) + { + System.out.println("InterfaceDeleter: "+(delete[index]?"- ":"+ ")+programClass.getInterfaceName(index)); + } + + if (!delete[index]) + { + interfaces[newInterfacesCount++] = interfaces[index]; + } + } + + // Update the signature. + if (newInterfacesCount < interfacesCount) + { + programClass.u2interfacesCount = newInterfacesCount; + + programClass.attributesAccept(this); + } + } + + + // Implementations for AttributeVisitor. + + public void visitAnyAttribute(Clazz clazz, Attribute attribute) {} + + + public void visitSignatureAttribute(Clazz clazz, SignatureAttribute signatureAttribute) + { + Clazz[] referencedClasses = signatureAttribute.referencedClasses; + if (referencedClasses != null) + { + // Process the generic definitions, superclass, and implemented + // interfaces. + InternalTypeEnumeration internalTypeEnumeration = + new InternalTypeEnumeration(signatureAttribute.getSignature(clazz)); + + // Recompose the signature types in a string buffer. + StringBuffer newSignatureBuffer = new StringBuffer(); + + // Also update the array with referenced classes. + int referencedClassIndex = 0; + int newReferencedClassIndex = 0; + + // Copy the variable type declarations and the super class type. + while (internalTypeEnumeration.hasMoreTypes()) + { + String internalType = internalTypeEnumeration.nextType(); + + // Append the type. + newSignatureBuffer.append(internalType); + + // Copy any referenced classes. + int classCount = + new DescriptorClassEnumeration(internalType).classCount(); + + for (int counter = 0; counter < classCount; counter++) + { + referencedClasses[newReferencedClassIndex++] = + referencedClasses[referencedClassIndex++]; + } + + if (DEBUG) + { + System.out.println("InterfaceDeleter: type = " + internalType + " (" + classCount + " referenced classes)"); + } + + if (ClassUtil.isInternalClassType(internalType)) + { + break; + } + } + + // Copy the interface types. + int index = 0; + while (internalTypeEnumeration.hasMoreTypes()) + { + String internalType = internalTypeEnumeration.nextType(); + + int classCount = + new DescriptorClassEnumeration(internalType).classCount(); + + if (DEBUG) + { + System.out.println("InterfaceDeleter: type " + (delete[index] ? "- " : "+ ") + internalType + " (" + classCount + " referenced classes)"); + } + + if (!delete[index++]) + { + // Append the type. + newSignatureBuffer.append(internalType); + + // Copy any referenced classes. + for (int counter = 0; counter < classCount; counter++) + { + referencedClasses[newReferencedClassIndex++] = + referencedClasses[referencedClassIndex++]; + } + } + else + { + referencedClassIndex += classCount; + } + } + + // Update the signature. + ((Utf8Constant)((ProgramClass)clazz).constantPool[signatureAttribute.u2signatureIndex]).setString(newSignatureBuffer.toString()); + + // Clear the remaining referenced classes. + Arrays.fill(referencedClasses, + newReferencedClassIndex, + referencedClassIndex, + null); + } + } +} |