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"Android XML resource parser"
/**
* Copyright 2011 Ryszard Wiśniewski
*
* 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 brut.androlib.res.decoder;
import brut.androlib.res.xml.ResXmlEncoders;
import brut.util.ExtDataInput;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.charset.*;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* @author Ryszard Wiśniewski
* @author Dmitry Skiba
*
* Block of strings, used in binary xml and arsc.
*
* TODO:
* - implement get()
*
*/
public class StringBlock {
/**
* Reads whole (including chunk type) string block from stream.
* Stream must be at the chunk type.
*/
public static StringBlock read(ExtDataInput reader) throws IOException {
reader.skipCheckInt(CHUNK_TYPE);
int chunkSize = reader.readInt();
int stringCount = reader.readInt();
int styleOffsetCount = reader.readInt();
int flags = reader.readInt();
int stringsOffset = reader.readInt();
int stylesOffset = reader.readInt();
StringBlock block = new StringBlock();
block.m_isUTF8 = (flags & UTF8_FLAG) != 0;
block.m_stringOffsets = reader.readIntArray(stringCount);
if (styleOffsetCount != 0) {
block.m_styleOffsets = reader.readIntArray(styleOffsetCount);
}
{
int size = ((stylesOffset == 0) ? chunkSize : stylesOffset) - stringsOffset;
if ((size % 4) != 0) {
throw new IOException("String data size is not multiple of 4 (" + size + ").");
}
block.m_strings = new byte[size];
reader.readFully(block.m_strings);
}
if (stylesOffset != 0) {
int size = (chunkSize - stylesOffset);
if ((size % 4) != 0) {
throw new IOException("Style data size is not multiple of 4 (" + size + ").");
}
block.m_styles = reader.readIntArray(size / 4);
}
return block;
}
/**
* Returns number of strings in block.
*/
public int getCount() {
return m_stringOffsets != null
? m_stringOffsets.length
: 0;
}
/**
* Returns raw string (without any styling information) at specified index.
*/
public String getString(int index) {
if (index < 0
|| m_stringOffsets == null
|| index >= m_stringOffsets.length) {
return null;
}
int offset = m_stringOffsets[index];
int length;
if (! m_isUTF8) {
length = getShort(m_strings, offset) * 2;
offset += 2;
} else {
offset += getVarint(m_strings, offset)[1];
int[] varint = getVarint(m_strings, offset);
offset += varint[1];
length = varint[0];
}
return decodeString(offset, length);
}
/**
* Not yet implemented.
*
* Returns string with style information (if any).
*/
public CharSequence get(int index) {
return getString(index);
}
/**
* Returns string with style tags (html-like).
*/
public String getHTML(int index) {
String raw = getString(index);
if (raw == null) {
return raw;
}
int[] style = getStyle(index);
if (style == null) {
return ResXmlEncoders.escapeXmlChars(raw);
}
StringBuilder html = new StringBuilder(raw.length() + 32);
int[] opened = new int[style.length / 3];
int offset = 0, depth = 0;
while (true) {
int i = -1, j;
for (j = 0; j != style.length; j += 3) {
if (style[j + 1] == -1) {
continue;
}
if (i == -1 || style[i + 1] > style[j + 1]) {
i = j;
}
}
int start = ((i != -1) ? style[i + 1] : raw.length());
for (j = depth - 1; j >= 0; j--) {
int last = opened[j];
int end = style[last + 2];
if (end >= start) {
break;
}
if (offset <= end) {
html.append(ResXmlEncoders.escapeXmlChars(
raw.substring(offset, end + 1)));
offset = end + 1;
}
outputStyleTag(getString(style[last]), html, true);
}
depth = j + 1;
if (offset < start) {
html.append(ResXmlEncoders.escapeXmlChars(
raw.substring(offset, start)));
offset = start;
}
if (i == -1) {
break;
}
outputStyleTag(getString(style[i]), html, false);
style[i + 1] = -1;
opened[depth++] = i;
}
return html.toString();
}
private void outputStyleTag(String tag, StringBuilder builder,
boolean close) {
builder.append('<');
if (close) {
builder.append('/');
}
int pos = tag.indexOf(';');
if (pos == -1) {
builder.append(tag);
} else {
builder.append(tag.substring(0, pos));
if (! close) {
boolean loop = true;
while (loop) {
int pos2 = tag.indexOf('=', pos + 1);
builder.append(' ').append(tag.substring(pos + 1, pos2))
.append("=\"");
pos = tag.indexOf(';', pos2 + 1);
String val;
if (pos != -1) {
val = tag.substring(pos2 + 1, pos);
} else {
loop = false;
val = tag.substring(pos2 + 1);
}
builder.append(ResXmlEncoders.escapeXmlChars(val))
.append('"');
}
}
}
builder.append('>');
}
/**
* Finds index of the string.
* Returns -1 if the string was not found.
*/
public int find(String string) {
if (string == null) {
return -1;
}
for (int i = 0; i != m_stringOffsets.length; ++i) {
int offset = m_stringOffsets[i];
int length = getShort(m_strings, offset);
if (length != string.length()) {
continue;
}
int j = 0;
for (; j != length; ++j) {
offset += 2;
if (string.charAt(j) != getShort(m_strings, offset)) {
break;
}
}
if (j == length) {
return i;
}
}
return -1;
}
///////////////////////////////////////////// implementation
private StringBlock() {
}
/**
* Returns style information - array of int triplets,
* where in each triplet:
* * first int is index of tag name ('b','i', etc.)
* * second int is tag start index in string
* * third int is tag end index in string
*/
private int[] getStyle(int index) {
if (m_styleOffsets == null || m_styles == null
|| index >= m_styleOffsets.length) {
return null;
}
int offset = m_styleOffsets[index] / 4;
int style[];
{
int count = 0;
for (int i = offset; i < m_styles.length; ++i) {
if (m_styles[i] == -1) {
break;
}
count += 1;
}
if (count == 0 || (count % 3) != 0) {
return null;
}
style = new int[count];
}
for (int i = offset, j = 0; i < m_styles.length;) {
if (m_styles[i] == -1) {
break;
}
style[j++] = m_styles[i++];
}
return style;
}
private String decodeString(int offset, int length) {
try {
return (m_isUTF8 ? UTF8_DECODER : UTF16LE_DECODER).decode(
ByteBuffer.wrap(m_strings, offset, length)).toString();
} catch (CharacterCodingException ex) {
LOGGER.log(Level.WARNING, null, ex);
return null;
}
}
private static final int getShort(byte[] array, int offset) {
return (array[offset + 1] & 0xff) << 8 | array[offset] & 0xff;
}
private static final int getShort(int[] array, int offset) {
int value = array[offset / 4];
if ((offset % 4) / 2 == 0) {
return (value & 0xFFFF);
} else {
return (value >>> 16);
}
}
private static final int[] getVarint(byte[] array, int offset) {
int val = array[offset];
boolean more = (val & 0x80) != 0;
val &= 0x7f;
if (! more) {
return new int[]{val, 1};
} else {
return new int[]{val << 8 | array[offset + 1] & 0xff, 2};
}
}
private int[] m_stringOffsets;
private byte[] m_strings;
private int[] m_styleOffsets;
private int[] m_styles;
private boolean m_isUTF8;
private static final CharsetDecoder UTF16LE_DECODER =
Charset.forName("UTF-16LE").newDecoder();
private static final CharsetDecoder UTF8_DECODER =
Charset.forName("UTF-8").newDecoder();
private static final Logger LOGGER =
Logger.getLogger(StringBlock.class.getName());
private static final int CHUNK_TYPE = 0x001C0001;
private static final int UTF8_FLAG = 0x00000100;
}
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