package com.shazam.axmlparser;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.util.Arrays;
import java.util.logging.Level;
import java.util.logging.Logger;
public class StringBlock {
/**
* Reads whole (including chunk type) string block from stream.
* Stream must be at the chunk type.
*
* @param reader the int reader
* @return the string block from stream
* @throws IOException when string or style data size is not multiple of 4
*/
public static StringBlock read(ExtDataInput reader) throws IOException {
reader.skipCheckChunkTypeInt(CHUNK_STRINGPOOL_TYPE, CHUNK_NULL_TYPE);
int chunkSize = reader.readInt();
// ResStringPool_header
int stringCount = reader.readInt();
int styleCount = 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);
block.m_stringOwns = new int[stringCount];
Arrays.fill(block.m_stringOwns, -1);
if (styleCount != 0) {
block.m_styleOffsets = reader.readIntArray(styleCount);
}
int size = ((stylesOffset == 0) ? chunkSize : stylesOffset) - stringsOffset;
block.m_strings = new byte[size];
reader.readFully(block.m_strings);
if (stylesOffset != 0) {
size = (chunkSize - stylesOffset);
block.m_styles = reader.readIntArray(size / 4);
// read remaining bytes
int remaining = size % 4;
if (remaining >= 1) {
while (remaining-- > 0) {
reader.readByte();
}
}
}
return block;
}
/**
* Returns number of strings in block.
*
* @return the number of strings
*/
public int getCount() {
return m_stringOffsets != null ? m_stringOffsets.length : 0;
}
/**
* Gets raw string at index
*
* @param index the index
* @return raw string (without any styling information) at specified index or null if index is invalid or object was not initialized.
*/
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) {
int[] val = getUtf8(m_strings, offset);
offset = val[0];
length = val[1];
} else {
int[] val = getUtf16(m_strings, offset);
offset += val[0];
length = val[1];
}
return decodeString(offset, length);
}
/**
* Gets string with style information
*
* @param index the index
* @return string with style information or null if index is invalid or object was not initialized.
*/
public CharSequence get(int index) {
return getString(index);
}
/**
* Returns string with style tags (html-like).
*
* @param index the index of style tags
* @return the style tag
*/
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);
}
// If the returned style is further in string, than string length. Lets skip it.
if (style[1] > raw.length()) {
return ResXmlEncoders.escapeXmlChars(raw);
}
StringBuilder html = new StringBuilder(raw.length() + 32);
int[] opened = new int[style.length / 3];
boolean[] unclosed = new boolean[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) {
if (style[last + 1] == -1 && end != -1) {
unclosed[j] = true;
}
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)));
if (j >= 0 && unclosed.length >= j && unclosed[j]) {
if (unclosed.length > (j + 1) && unclosed[j + 1] || unclosed.length == 1) {
outputStyleTag(getString(style[opened[j]]), html, true);
}
}
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);
// malformed style information will cause crash. so
// prematurely end style tags, if recreation
// cannot be created.
if (pos2 != -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('"');
} else {
loop = false;
}
}
}
}
builder.append('>');
}
/**
* Finds index of the string.
*
* @param string the string to find
* @return -1 if the string was not found or the index
*/
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;
}
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[] getUtf8(byte[] array, int offset) {
int val = array[offset];
int length;
// We skip the utf16 length of the string
if ((val & 0x80) != 0) {
offset += 2;
} else {
offset += 1;
}
// And we read only the utf-8 encoded length of the string
val = array[offset];
offset += 1;
if ((val & 0x80) != 0) {
int low = (array[offset] & 0xFF);
length = ((val & 0x7F) << 8) + low;
offset += 1;
} else {
length = val;
}
return new int[]{offset, length};
}
private static final int[] getUtf16(byte[] array, int offset) {
int val = ((array[offset + 1] & 0xFF) << 8 | array[offset] & 0xFF);
if ((val & 0x8000) != 0) {
int high = (array[offset + 3] & 0xFF) << 8;
int low = (array[offset + 2] & 0xFF);
int len_value = ((val & 0x7FFF) << 16) + (high + low);
return new int[]{4, len_value * 2};
}
return new int[]{2, val * 2};
}
private int[] m_stringOffsets;
private byte[] m_strings;
private int[] m_styleOffsets;
private int[] m_styles;
private boolean m_isUTF8;
private int[] m_stringOwns;
private final CharsetDecoder UTF16LE_DECODER = Charset.forName("UTF-16LE").newDecoder();
private final CharsetDecoder UTF8_DECODER = Charset.forName("UTF-8").newDecoder();
private static final Logger LOGGER = Logger.getLogger(StringBlock.class.getName());
// ResChunk_header = header.type (0x0001) + header.headerSize (0x001C)
private static final int CHUNK_STRINGPOOL_TYPE = 0x001C0001;
private static final int CHUNK_NULL_TYPE = 0x00000000;
private static final int UTF8_FLAG = 0x00000100;
}
