ghidra-master/Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/android/dex/format/PrototypesIDItem.java
/* ###
 * IP: GHIDRA
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package ghidra.file.formats.android.dex.format;

import java.io.IOException;

import ghidra.app.util.bin.BinaryReader;
import ghidra.app.util.bin.StructConverter;
import ghidra.app.util.bin.StructConverterUtil;
import ghidra.file.formats.android.dex.util.DexUtil;
import ghidra.program.model.data.CategoryPath;
import ghidra.program.model.data.DataType;
import ghidra.util.exception.DuplicateNameException;

public class PrototypesIDItem implements StructConverter {

	private int shortyIndex;
	private int returnTypeIndex;
	private int parametersOffset;
	private TypeList _parameters;

	public PrototypesIDItem(BinaryReader reader, DexHeader dexHeader) throws IOException {
		shortyIndex = reader.readNextInt();
		returnTypeIndex = reader.readNextInt();
		parametersOffset = reader.readNextInt();

		if (parametersOffset > 0) {
			long oldIndex = reader.getPointerIndex();
			try {
				//starting in Android 12, CDEX files are incomplete
				int adjustedParametersOffset = DexUtil.adjustOffset(parametersOffset, dexHeader);
				if (reader.isValidIndex(adjustedParametersOffset)) {
					reader.setPointerIndex(adjustedParametersOffset);
					_parameters = new TypeList(reader);
				}
			}
			finally {
				reader.setPointerIndex(oldIndex);
			}
		}
	}

	public int getShortyIndex() {
		return shortyIndex;
	}

	public int getReturnTypeIndex() {
		return returnTypeIndex;
	}

	/**
	 * NOTE: For CDEX files, this value is relative to DataOffset in DexHeader
	 */
	public int getParametersOffset() {
		return parametersOffset;
	}

	public TypeList getParameters() {
		return _parameters;
	}

	@Override
	public DataType toDataType() throws DuplicateNameException, IOException {
		DataType dataType = StructConverterUtil.toDataType(PrototypesIDItem.class);
		dataType.setCategoryPath(new CategoryPath("/dex"));
		return dataType;
	}

}
