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/*
* Copyright 2012, Google LLC
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google LLC 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 com.android.tools.smali.dexlib2.dexbacked.reference;
import com.google.common.collect.ImmutableList;
import com.android.tools.smali.dexlib2.base.reference.BaseMethodReference;
import com.android.tools.smali.dexlib2.dexbacked.DexBackedDexFile;
import com.android.tools.smali.dexlib2.dexbacked.raw.MethodIdItem;
import com.android.tools.smali.dexlib2.dexbacked.raw.ProtoIdItem;
import com.android.tools.smali.dexlib2.dexbacked.raw.TypeListItem;
import com.android.tools.smali.dexlib2.dexbacked.util.FixedSizeList;
import javax.annotation.Nonnull;
import java.util.List;
public class DexBackedMethodReference extends BaseMethodReference {
@Nonnull public final DexBackedDexFile dexFile;
private final int methodIndex;
private int protoIdItemOffset;
public DexBackedMethodReference(@Nonnull DexBackedDexFile dexFile, int methodIndex) {
this.dexFile = dexFile;
this.methodIndex = methodIndex;
}
@Nonnull
@Override
public String getDefiningClass() {
return dexFile.getTypeSection().get(dexFile.getBuffer().readUshort(
dexFile.getMethodSection().getOffset(methodIndex) + MethodIdItem.CLASS_OFFSET));
}
@Nonnull
@Override
public String getName() {
return dexFile.getStringSection().get(dexFile.getBuffer().readSmallUint(
dexFile.getMethodSection().getOffset(methodIndex) + MethodIdItem.NAME_OFFSET));
}
@Nonnull
@Override
public List<String> getParameterTypes() {
int protoIdItemOffset = getProtoIdItemOffset();
final int parametersOffset = dexFile.getBuffer().readSmallUint(
protoIdItemOffset + ProtoIdItem.PARAMETERS_OFFSET);
if (parametersOffset > 0) {
final int parameterCount =
dexFile.getDataBuffer().readSmallUint(parametersOffset + TypeListItem.SIZE_OFFSET);
final int paramListStart = parametersOffset + TypeListItem.LIST_OFFSET;
return new FixedSizeList<String>() {
@Nonnull
@Override
public String readItem(final int index) {
return dexFile.getTypeSection().get(dexFile.getDataBuffer().readUshort(paramListStart + 2*index));
}
@Override public int size() { return parameterCount; }
};
}
return ImmutableList.of();
}
@Nonnull
@Override
public String getReturnType() {
int protoIdItemOffset = getProtoIdItemOffset();
return dexFile.getTypeSection().get(
dexFile.getBuffer().readSmallUint(protoIdItemOffset + ProtoIdItem.RETURN_TYPE_OFFSET));
}
private int getProtoIdItemOffset() {
if (protoIdItemOffset == 0) {
protoIdItemOffset = dexFile.getProtoSection().getOffset(dexFile.getBuffer().readUshort(
dexFile.getMethodSection().getOffset(methodIndex) + MethodIdItem.PROTO_OFFSET));
}
return protoIdItemOffset;
}
/**
* Calculate and return the private size of a method reference.
*
* Calculated as: class_idx + proto_idx + name_idx
*
* @return size in bytes
*/
public int getSize() {
return MethodIdItem.ITEM_SIZE; //ushort + ushort + uint for indices
}
@Override
public void validateReference() throws InvalidReferenceException {
if (methodIndex < 0 || methodIndex >= dexFile.getMethodSection().size()) {
throw new InvalidReferenceException("method@" + methodIndex);
}
}
}
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