/*
* Copyright (C) 2011 The Android Open Source Project
*
* 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 com.android.dex;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Arrays;
/**
* The file header and map.
*/
public final class TableOfContents {
/*
* TODO: factor out ID constants.
*/
public final Section header = new Section(0x0000);
public final Section stringIds = new Section(0x0001);
public final Section typeIds = new Section(0x0002);
public final Section protoIds = new Section(0x0003);
public final Section fieldIds = new Section(0x0004);
public final Section methodIds = new Section(0x0005);
public final Section classDefs = new Section(0x0006);
public final Section mapList = new Section(0x1000);
public final Section typeLists = new Section(0x1001);
public final Section annotationSetRefLists = new Section(0x1002);
public final Section annotationSets = new Section(0x1003);
public final Section classDatas = new Section(0x2000);
public final Section codes = new Section(0x2001);
public final Section stringDatas = new Section(0x2002);
public final Section debugInfos = new Section(0x2003);
public final Section annotations = new Section(0x2004);
public final Section encodedArrays = new Section(0x2005);
public final Section annotationsDirectories = new Section(0x2006);
public final Section[] sections = {
header, stringIds, typeIds, protoIds, fieldIds, methodIds, classDefs, mapList,
typeLists, annotationSetRefLists, annotationSets, classDatas, codes, stringDatas,
debugInfos, annotations, encodedArrays, annotationsDirectories
};
public int checksum;
public byte[] signature;
public int fileSize;
public int linkSize;
public int linkOff;
public int dataSize;
public int dataOff;
public TableOfContents() {
signature = new byte[20];
}
public void readFrom(Dex dex) throws IOException {
readHeader(dex.open(0));
readMap(dex.open(mapList.off));
computeSizesFromOffsets();
}
private void readHeader(Dex.Section headerIn) throws UnsupportedEncodingException {
byte[] magic = headerIn.readByteArray(8);
int apiTarget = DexFormat.magicToApi(magic);
if (apiTarget != DexFormat.API_NO_EXTENDED_OPCODES) {
throw new DexException("Unexpected magic: " + Arrays.toString(magic));
}
checksum = headerIn.readInt();
signature = headerIn.readByteArray(20);
fileSize = headerIn.readInt();
int headerSize = headerIn.readInt();
if (headerSize != SizeOf.HEADER_ITEM) {
throw new DexException("Unexpected header: 0x" + Integer.toHexString(headerSize));
}
int endianTag = headerIn.readInt();
if (endianTag != DexFormat.ENDIAN_TAG) {
throw new DexException("Unexpected endian tag: 0x" + Integer.toHexString(endianTag));
}
linkSize = headerIn.readInt();
linkOff = headerIn.readInt();
mapList.off = headerIn.readInt();
if (mapList.off == 0) {
throw new DexException("Cannot merge dex files that do not contain a map");
}
stringIds.size = headerIn.readInt();
stringIds.off = headerIn.readInt();
typeIds.size = headerIn.readInt();
typeIds.off = headerIn.readInt();
protoIds.size = headerIn.readInt();
protoIds.off = headerIn.readInt();
fieldIds.size = headerIn.readInt();
fieldIds.off = headerIn.readInt();
methodIds.size = headerIn.readInt();
methodIds.off = headerIn.readInt();
classDefs.size = headerIn.readInt();
classDefs.off = headerIn.readInt();
dataSize = headerIn.readInt();
dataOff = headerIn.readInt();
}
private void readMap(Dex.Section in) throws IOException {
int mapSize = in.readInt();
Section previous = null;
for (int i = 0; i < mapSize; i++) {
short type = in.readShort();
in.readShort(); // unused
Section section = getSection(type);
int size = in.readInt();
int offset = in.readInt();
if ((section.size != 0 && section.size != size)
|| (section.off != -1 && section.off != offset)) {
throw new DexException("Unexpected map value for 0x" + Integer.toHexString(type));
}
section.size = size;
section.off = offset;
if (previous != null && previous.off > section.off) {
throw new DexException("Map is unsorted at " + previous + ", " + section);
}
previous = section;
}
Arrays.sort(sections);
}
public void computeSizesFromOffsets() {
int end = dataOff + dataSize;
for (int i = sections.length - 1; i >= 0; i--) {
Section section = sections[i];
if (section.off == -1) {
continue;
}
if (section.off > end) {
throw new DexException("Map is unsorted at " + section);
}
section.byteCount = end - section.off;
end = section.off;
}
}
private Section getSection(short type) {
for (Section section : sections) {
if (section.type == type) {
return section;
}
}
throw new IllegalArgumentException("No such map item: " + type);
}
public void writeHeader(Dex.Section out) throws IOException {
out.write(DexFormat.apiToMagic(DexFormat.API_NO_EXTENDED_OPCODES).getBytes("UTF-8"));
out.writeInt(checksum);
out.write(signature);
out.writeInt(fileSize);
out.writeInt(SizeOf.HEADER_ITEM);
out.writeInt(DexFormat.ENDIAN_TAG);
out.writeInt(linkSize);
out.writeInt(linkOff);
out.writeInt(mapList.off);
out.writeInt(stringIds.size);
out.writeInt(stringIds.off);
out.writeInt(typeIds.size);
out.writeInt(typeIds.off);
out.writeInt(protoIds.size);
out.writeInt(protoIds.off);
out.writeInt(fieldIds.size);
out.writeInt(fieldIds.off);
out.writeInt(methodIds.size);
out.writeInt(methodIds.off);
out.writeInt(classDefs.size);
out.writeInt(classDefs.off);
out.writeInt(dataSize);
out.writeInt(dataOff);
}
public void writeMap(Dex.Section out) throws IOException {
int count = 0;
for (Section section : sections) {
if (section.exists()) {
count++;
}
}
out.writeInt(count);
for (Section section : sections) {
if (section.exists()) {
out.writeShort(section.type);
out.writeShort((short) 0);
out.writeInt(section.size);
out.writeInt(section.off);
}
}
}
public static class Section implements Comparable<Section> {
public final short type;
public int size = 0;
public int off = -1;
public int byteCount = 0;
public Section(int type) {
this.type = (short) type;
}
public boolean exists() {
return size > 0;
}
public int compareTo(Section section) {
if (off != section.off) {
return off < section.off ? -1 : 1;
}
return 0;
}
@Override public String toString() {
return String.format("Section[type=%#x,off=%#x,size=%#x]", type, off, size);
}
}
}