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/*
* Copyright 2015 Google, Inc.
*
* 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.gabrielittner.github.diff.androidmanifest;
import com.google.common.io.LittleEndianDataInputStream;
import java.io.ByteArrayInputStream;
import java.io.DataInput;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* Decompresses an Android binary xml file. It is not the same as the original file, but should
* contain the same data.
*
* This code is based on code posted on StackOverflow by Ribo:
* http://stackoverflow.com/a/4761689/496992
*
* It contains minor fixes to optionally support CDATA elements and namespaces.
*
* Improvements made using code android code as reference:
* - https://android.googlesource.com/platform/frameworks/base/+/master/include/androidfw/
* ResourceTypes.h
* - https://android.googlesource.com/platform/frameworks/base/+/master/libs/androidfw/
* ResourceTypes.cpp
*/
class XmlDecompressor {
//Identifiers for XML Chunk Types
private static final int PACKED_XML_IDENTIFIER = 0x00080003;
private static final int END_DOC_TAG = 0x0101;
private static final int START_ELEMENT_TAG = 0x0102;
private static final int END_ELEMENT_TAG = 0x0103;
private static final int CDATA_TAG = 0x0104;
private static final int ATTRS_MARKER = 0x00140014;
private static final int RES_XML_RESOURCE_MAP_TYPE = 0x180;
private static final int RES_XML_FIRST_CHUNK_TYPE = 0x100;
private static final int REX_XML_STRING_TABLE = 0x0001;
//Resource Types
private static final int RES_TYPE_NULL = 0x00;
private static final int RES_TYPE_REFERENCE = 0x01;
private static final int RES_TYPE_ATTRIBUTE = 0x02;
private static final int RES_TYPE_STRING = 0x03;
private static final int RES_TYPE_FLOAT = 0x04;
private static final int RES_TYPE_DIMENSION = 0x05;
private static final int RES_TYPE_FRACTION = 0x06;
private static final int RES_TYPE_DYNAMIC_REFERENCE = 0x07;
private static final int RES_TYPE_INT_DEC = 0x10;
private static final int RES_TYPE_INT_HEX = 0x11;
private static final int RES_TYPE_INT_BOOLEAN = 0x12;
//Complex Types
private static final int COMPLEX_UNIT_SHIFT = 0;
private static final int COMPLEX_UNIT_MASK = 0xf;
private static final int COMPLEX_MANTISSA_SHIFT = 8;
private static final int COMPLEX_MANTISSA_MASK = 0xffffff;
private static final int COMPLEX_RADIX_SHIFT = 4;
private static final int COMPLEX_RADIX_MASK = 0x3;
private static final int COMPLEX_UNIT_FRACTION = 0;
private static final int COMPLEX_UNIT_FRACTION_PARENT = 1;
private static final float MANTISSA_MULT = 1.0f / (1 << COMPLEX_MANTISSA_SHIFT);
private static final float RADIX_MULTS[] = {
1.0f * MANTISSA_MULT, 1.0f / (1 << 7)*MANTISSA_MULT,
1.0f / (1 << 15) * MANTISSA_MULT, 1.0f / (1 << 23)*MANTISSA_MULT
};
//Resource Values
private static final int RES_VALUE_TRUE = 0xffffffff;
private static final int RES_VALUE_FALSE = 0x00000000;
//Char array used to fill spaces.
private static char[] SPACE_FILL = new char[160];
private static final int IDENT_SIZE = 2;
private static final int ATTR_IDENT_SIZE = 4;
private static final String ERROR_INVALID_MAGIC_NUMBER =
"Invalid packed XML identifier. Expecting 0x%08X, found 0x%08X\n";
private static final String ERROR_INVALID_STRING_TABLE_ID =
"Invalid String table identifier. Expecting 0x%08X, found 0x%08X\n";
private static final String ERROR_UNKNOWN_TAG = "Unknown Tag 0x%04X\n";
private static final String ERROR_ATTRIBUTE_MARKER = "Expecting %08X, Found %08X\n";
private boolean appendNamespaces = false;
private boolean appendCData = true;
static {
Arrays.fill(SPACE_FILL, ' ');
}
public void setAppendNamespaces(boolean appendNamespaces) {
this.appendNamespaces = appendNamespaces;
}
public void setAppendCData(boolean appendCData) {
this.appendCData = appendCData;
}
String decompressXml(byte[] bytes) throws IOException {
try (ByteArrayInputStream bin = new ByteArrayInputStream(bytes)) {
return decompressXml(bin);
}
}
private String decompressXml(InputStream is) throws IOException {
StringBuilder result = new StringBuilder("\n");
try(LittleEndianDataInputStream dis = new LittleEndianDataInputStream(is)) {
//Getting and checking the marker for a valid XMl file
int fileMarker = dis.readInt();
if (fileMarker != PACKED_XML_IDENTIFIER) {
throw new IOException(
String.format(ERROR_INVALID_MAGIC_NUMBER,
PACKED_XML_IDENTIFIER,
fileMarker));
}
dis.skipBytes(4);
List packedStrings = parseStrings(dis);
int ident = 0;
int tag = dis.readShort();
do {
int headerSize = dis.readShort();
int chunkSize = dis.readInt();
switch (tag) {
case RES_XML_FIRST_CHUNK_TYPE: {
dis.skipBytes(chunkSize - 8);
break;
}
case RES_XML_RESOURCE_MAP_TYPE: {
dis.skipBytes(chunkSize - 8);
break;
}
case START_ELEMENT_TAG: {
parseStartTag(result, dis, packedStrings, ident);
ident++;
break;
}
case END_ELEMENT_TAG: {
ident--;
parseEndTag(result, dis, packedStrings, ident);
break;
}
case CDATA_TAG: {
parseCDataTag(result, dis, packedStrings, ident);
break;
}
default:
System.err.println(String.format(ERROR_UNKNOWN_TAG, tag));
}
tag = dis.readShort();
} while (tag != END_DOC_TAG);
return result.toString();
}
}
private void parseCDataTag(StringBuilder sb, DataInput dis, List strings, int ident)
throws IOException {
//Skipping 3 unknowns integers:
dis.skipBytes(8);
int nameStringIndex = dis.readInt();
//Skipping more 2 unknown integers.
dis.skipBytes(8);
if (appendCData) {
sb.append(SPACE_FILL, 0, ident * IDENT_SIZE);
sb.append("\n");
}
}
private void parseEndTag(StringBuilder sb, DataInput dis, List strings, int ident)
throws IOException {
sb.append(SPACE_FILL, 0, ident * IDENT_SIZE);
sb.append("= 0) {
sb.append(strings.get(namespaceStringIndex)).append(":");
}
int nameStringIndex = dis.readInt();
sb.append(strings.get(nameStringIndex)).append(">\n");
}
private void parseStartTag(StringBuilder sb, DataInput dis, List strings, int ident)
throws IOException {
sb.append(SPACE_FILL, 0, ident * IDENT_SIZE);
sb.append("<");
//Skipping 3 integers:
// 1 - a flag?, like 38000000
// 2 - Line of where this tag appeared in the original source file
// 3 - Unknown: always FFFFFFFF?
dis.skipBytes(8);
int namespaceStringIndex = dis.readInt();
if (appendNamespaces && namespaceStringIndex >= 0) {
sb.append(strings.get(namespaceStringIndex)).append(":");
}
int nameStringIndex = dis.readInt();
sb.append(strings.get(nameStringIndex));
parseAttributes(sb, dis, strings, ident);
sb.append(">\n");
}
private void parseAttributes(StringBuilder sb, DataInput dis, List strings, int ident)
throws IOException {
int marker = dis.readInt();
if (marker != ATTRS_MARKER) {
System.err.printf(ERROR_ATTRIBUTE_MARKER, ATTRS_MARKER, marker);
}
int numAttributes = dis.readInt();
//skipping 1 unknown integer: always 00000000?
dis.skipBytes(4);
for (int i = 0; i < numAttributes; i++) {
sb.append("\n").append(SPACE_FILL, 0, ident * IDENT_SIZE + ATTR_IDENT_SIZE);
int attributeNamespaceIndex = dis.readInt();
int attributeNameIndex = dis.readInt();
int attributeValueIndex = dis.readInt();
dis.skipBytes(3);
int attrValueType = dis.readByte();
int attributeResourceId = dis.readInt();
if (appendNamespaces && attributeNamespaceIndex >= 0) {
sb.append(strings.get(attributeNamespaceIndex)).append(":");
}
String attributeName = strings.get(attributeNameIndex);
if (attributeName.isEmpty()) attributeName="unknown";
String attributeValue;
switch (attrValueType) {
case RES_TYPE_NULL:
attributeValue = attributeResourceId == 0 ? "" : "";
break;
case RES_TYPE_REFERENCE:
attributeValue = String.format("@res/0x%08X", attributeResourceId);
break;
case RES_TYPE_ATTRIBUTE:
attributeValue = String.format("@attr/0x%08X", attributeResourceId);
break;
case RES_TYPE_STRING:
attributeValue = strings.get(attributeValueIndex);
break;
case RES_TYPE_FLOAT:
attributeValue = Float.toString(Float.intBitsToFloat(attributeResourceId));
break;
case RES_TYPE_DIMENSION:
float value = resValue(attributeResourceId);
String type = getDimensionType(attributeResourceId);
attributeValue = value + type;
break;
case RES_TYPE_FRACTION:
value = resValue(attributeResourceId);
type = getFractionType(attributeResourceId);
attributeValue = value + type;
break;
case RES_TYPE_DYNAMIC_REFERENCE:
attributeValue = String.format("@dyn/0x%08X", attributeResourceId);
break;
case RES_TYPE_INT_DEC:
attributeValue = Integer.toString(attributeResourceId);
break;
case RES_TYPE_INT_HEX:
attributeValue = String.format("0x%08X", attributeResourceId);
break;
case RES_TYPE_INT_BOOLEAN:
attributeValue = attributeResourceId == RES_VALUE_TRUE ? "true" : "false";
break;
default:
attributeValue = String.format("0x%08X", attributeResourceId);
}
sb.append(attributeName).append("='").append(attributeValue).append("'");
}
}
private List parseStrings(DataInput dis) throws IOException {
int stringMarker = dis.readShort();
if (stringMarker != REX_XML_STRING_TABLE) {
throw new IOException(
String.format(ERROR_INVALID_MAGIC_NUMBER,
PACKED_XML_IDENTIFIER,
stringMarker));
}
int headerSize = dis.readShort();
int chunkSize = dis.readInt();
int numStrings = dis.readInt();
int numStyles = dis.readInt();
int flags = dis.readInt();
int stringStart = dis.readInt();
int stylesStart = dis.readInt();
boolean isUtf8Encoded = (flags & 0x100) > 0 ;
int glyphSize;
String encoding;
if (isUtf8Encoded) {
glyphSize = 1;
encoding = "UTF-8";
} else {
glyphSize = 2;
encoding = "UTF-16LE";
}
return parseUsingByteBuffer(chunkSize, headerSize, numStrings, numStyles, isUtf8Encoded,
glyphSize, encoding, dis);
}
private static List parseUsingByteBuffer(int chunkSize, int headerSize, int numStrings,
int numStyles, boolean isUtf8Encoded, int glyphSize, String encoding, DataInput dis)
throws IOException{
int dataSize = chunkSize - headerSize;
byte[] buffer = new byte[dataSize];
ByteBuffer byteBuffer = ByteBuffer.allocate(dataSize);
byteBuffer.order(ByteOrder.LITTLE_ENDIAN);
dis.readFully(buffer);
byteBuffer.put(buffer);
byteBuffer.rewind();
//Read the string offsets
List packedStrings = new ArrayList<>(numStrings);
int[] offsets = new int[numStrings];
for (int i = 0; i < numStrings; i++) {
offsets[i] = byteBuffer.getInt();
}
//Read the string from each offset
int stringsStart = byteBuffer.position();
for (int i = 0; i < numStrings; i++) {
byteBuffer.position(stringsStart + offsets[i]);
int len;
if (isUtf8Encoded) {
len = getUnsignedByte(byteBuffer);
byteBuffer.get();
} else {
len = getUnsignedShort(byteBuffer);
}
int bytelen = len * glyphSize;
String str = new String(buffer, stringsStart + offsets[i] + 2, bytelen, encoding);
packedStrings.add(str);
}
return packedStrings;
}
private static int getUnsignedShort(ByteBuffer bb) {
return (bb.getShort() & 0xffff);
}
private static int getUnsignedByte(ByteBuffer bb) {
return (bb.get() & 0xff);
}
public static long getUnsignedInt(ByteBuffer bb) {
return ((long)bb.getInt() & 0xffffffffL);
}
private static String getDimensionType(int data) {
switch ((data >> COMPLEX_UNIT_SHIFT) & COMPLEX_UNIT_MASK) {
case 0: return "px";
case 1: return "dp";
case 2: return "sp";
case 3: return "pt";
case 4: return "in";
case 5: return "mm";
default: return " (unknown unit)";
}
}
private static String getFractionType(int data) {
switch ((data >> COMPLEX_UNIT_SHIFT) & COMPLEX_UNIT_MASK) {
case COMPLEX_UNIT_FRACTION:
return "%%";
case COMPLEX_UNIT_FRACTION_PARENT:
return "%%p";
default:
return "(unknown unit)";
}
}
private static float resValue(int data) {
float value = (data&(COMPLEX_MANTISSA_MASK
<>COMPLEX_RADIX_SHIFT)
& COMPLEX_RADIX_MASK];
return value;
}
}
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