/* | |
* [The "BSD licence"] | |
* Copyright (c) 2009 Ben Gruver | |
* 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; | |
import java.io.UnsupportedEncodingException; | |
public class HeaderItem extends Item<HeaderItem> { | |
/** | |
* non-null; the file format magic number, represented as the | |
* low-order bytes of a string | |
*/ | |
private static final String MAGIC = "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[] expectedMagic; | |
try { | |
expectedMagic = MAGIC.getBytes("US-ASCII"); | |
} catch (UnsupportedEncodingException ex) { | |
throw new RuntimeException(ex); | |
} | |
byte[] readMagic = in.readBytes(8); | |
for (int i=0; i<8; i++) { | |
if (expectedMagic[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) { | |
byte[] magic; | |
try { | |
magic = MAGIC.getBytes("US-ASCII"); | |
} catch (UnsupportedEncodingException ex) { | |
throw new RuntimeException(ex); | |
} | |
out.annotate("magic: " + Utf8Utils.escapeString(MAGIC)); | |
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; | |
} | |
} |