/*
* [The "BSD licence"]
* Copyright (c) 2010 Ben Gruver (JesusFreke)
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.jf.dexlib;
import org.jf.dexlib.Util.AnnotatedOutput;
import org.jf.dexlib.Util.Input;
import org.jf.dexlib.Util.Utf8Utils;
public class HeaderItem extends Item<HeaderItem> {
/**
* the file format magic number, represented as the
* low-order bytes of a string
*/
public static final byte[] MAGIC = new byte[] {0x64, 0x65, 0x78, 0x0A, 0x30, 0x33, 0x35, 0x00};//"dex\n035" + '\0';
/** size of this section, in bytes */
private static final int HEADER_SIZE = 0x70;
/** the endianness constants */
private static final int LITTLE_ENDIAN = 0x12345678;
private static final int BIG_ENDIAN = 0x78562312;
/**
* Create a new uninitialized <code>HeaderItem</code>
* @param dexFile The <code>DexFile</code> containing this <code>HeaderItem</code>
*/
protected HeaderItem(final DexFile dexFile) {
super(dexFile);
}
/** {@inheritDoc} */
protected void readItem(Input in, ReadContext readContext) {
byte[] readMagic = in.readBytes(8);
for (int i=0; i<8; i++) {
if (MAGIC[i] != readMagic[i]) {
throw new RuntimeException("The magic value is not the expected value");
}
}
in.readBytes(20); //checksum
in.readInt(); //signature
in.readInt(); //filesize
if (in.readInt() != HEADER_SIZE) {
throw new RuntimeException("The header size is not the expected value (0x70)");
}
int endianTag = in.readInt();
if (endianTag == BIG_ENDIAN) {
throw new RuntimeException("This dex file is big endian. Only little endian is currently supported.");
} else if (endianTag != LITTLE_ENDIAN) {
throw new RuntimeException("The endian tag is not 0x12345678 or 0x78563412");
}
//link_size
if (in.readInt() != 0) {
throw new RuntimeException("This dex file has a link section, which is not supported");
}
//link_off
if (in.readInt() != 0) {
throw new RuntimeException("This dex file has a link section, which is not supported");
}
int sectionSize;
int sectionOffset;
//map_offset
sectionOffset = in.readInt();
readContext.addSection(ItemType.TYPE_MAP_LIST, 1, sectionOffset);
//string_id_item
sectionSize = in.readInt();
sectionOffset = in.readInt();
readContext.addSection(ItemType.TYPE_STRING_ID_ITEM, sectionSize, sectionOffset);
//type_id_item
sectionSize = in.readInt();
sectionOffset = in.readInt();
readContext.addSection(ItemType.TYPE_TYPE_ID_ITEM, sectionSize, sectionOffset);
//proto_id_item
sectionSize = in.readInt();
sectionOffset = in.readInt();
readContext.addSection(ItemType.TYPE_PROTO_ID_ITEM, sectionSize, sectionOffset);
//field_id_item
sectionSize = in.readInt();
sectionOffset = in.readInt();
readContext.addSection(ItemType.TYPE_FIELD_ID_ITEM, sectionSize, sectionOffset);
//method_id_item
sectionSize = in.readInt();
sectionOffset = in.readInt();
readContext.addSection(ItemType.TYPE_METHOD_ID_ITEM, sectionSize, sectionOffset);
//class_data_item
sectionSize = in.readInt();
sectionOffset = in.readInt();
readContext.addSection(ItemType.TYPE_CLASS_DEF_ITEM, sectionSize, sectionOffset);
in.readInt(); //data_size
in.readInt(); //data_off
}
/** {@inheritDoc} */
protected int placeItem(int offset) {
return HEADER_SIZE;
}
/** {@inheritDoc} */
protected void writeItem(AnnotatedOutput out) {
StringBuilder magicBuilder = new StringBuilder();
for (int i=0; i<8; i++) {
magicBuilder.append((char)MAGIC[i]);
}
out.annotate("magic: " + Utf8Utils.escapeString(magicBuilder.toString()));
out.write(MAGIC);
out.annotate("checksum");
out.writeInt(0);
out.annotate("signature");
out.write(new byte[20]);
out.annotate("file_size: 0x" + Integer.toHexString(dexFile.getFileSize()) + " (" + dexFile.getFileSize() +
" bytes)");
out.writeInt(dexFile.getFileSize());
out.annotate("header_size: 0x" + Integer.toHexString(HEADER_SIZE));
out.writeInt(HEADER_SIZE);
out.annotate("endian_tag: 0x" + Integer.toHexString(LITTLE_ENDIAN));
out.writeInt(LITTLE_ENDIAN);
out.annotate("link_size: 0");
out.writeInt(0);
out.annotate("link_off: 0");
out.writeInt(0);
out.annotate("map_off: 0x" + Integer.toHexString(dexFile.MapItem.getOffset()));
out.writeInt(dexFile.MapItem.getOffset());
out.annotate("string_ids_size: " + dexFile.StringIdsSection.getItems().size());
out.writeInt(dexFile.StringIdsSection.getItems().size());
out.annotate("string_ids_off: 0x" + Integer.toHexString(dexFile.StringIdsSection.getOffset()));
out.writeInt(dexFile.StringIdsSection.getOffset());
out.annotate("type_ids_size: " + dexFile.TypeIdsSection.getItems().size());
out.writeInt(dexFile.TypeIdsSection.getItems().size());
out.annotate("type_ids_off: 0x" + Integer.toHexString(dexFile.TypeIdsSection.getOffset()));
out.writeInt(dexFile.TypeIdsSection.getOffset());
out.annotate("proto_ids_size: " + dexFile.ProtoIdsSection.getItems().size());
out.writeInt(dexFile.ProtoIdsSection.getItems().size());
out.annotate("proto_ids_off: 0x" + Integer.toHexString(dexFile.ProtoIdsSection.getOffset()));
out.writeInt(dexFile.ProtoIdsSection.getOffset());
out.annotate("field_ids_size: " + dexFile.FieldIdsSection.getItems().size());
out.writeInt(dexFile.FieldIdsSection.getItems().size());
out.annotate("field_ids_off: 0x" + Integer.toHexString(dexFile.FieldIdsSection.getOffset()));
out.writeInt(dexFile.FieldIdsSection.getOffset());
out.annotate("method_ids_size: " + dexFile.MethodIdsSection.getItems().size());
out.writeInt(dexFile.MethodIdsSection.getItems().size());
out.annotate("method_ids_off: 0x" + Integer.toHexString(dexFile.MethodIdsSection.getOffset()));
out.writeInt(dexFile.MethodIdsSection.getOffset());
out.annotate("class_defs_size: " + dexFile.ClassDefsSection.getItems().size());
out.writeInt(dexFile.ClassDefsSection.getItems().size());
out.annotate("class_defs_off: 0x" + Integer.toHexString(dexFile.ClassDefsSection.getOffset()));
out.writeInt(dexFile.ClassDefsSection.getOffset());
out.annotate("data_size: 0x" + Integer.toHexString(dexFile.getDataSize()) + " (" + dexFile.getDataSize() +
" bytes)");
out.writeInt(dexFile.getDataSize());
out.annotate("data_off: 0x" + Integer.toHexString(dexFile.getDataOffset()));
out.writeInt(dexFile.getDataOffset());
}
/** {@inheritDoc} */
public ItemType getItemType() {
return ItemType.TYPE_HEADER_ITEM;
}
/** {@inheritDoc} */
public String getConciseIdentity() {
return "header_item";
}
/** {@inheritDoc} */
public int compareTo(HeaderItem o) {
//there is only 1 header item
return 0;
}
}