/*
* Copyright 2008 Android4ME
*
* 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.majeur.xmlapkparser;
import java.io.IOException;
/**
* @author Dmitry Skiba
* <p/>
* Block of strings, used in binary xml and arsc.
* <p/>
* 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(IntReader reader) throws IOException {
ChunkUtil.readCheckType(reader, CHUNK_TYPE);
int chunkSize = reader.readInt();
int stringCount = reader.readInt();
int styleOffsetCount = reader.readInt();
/*?*/
reader.readInt();
int stringsOffset = reader.readInt();
int stylesOffset = reader.readInt();
StringBlock block = new StringBlock();
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 = reader.readIntArray(size / 4);
}
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 = getShort(m_strings, offset);
StringBuilder result = new StringBuilder(length);
for (; length != 0; length -= 1) {
offset += 2;
result.append((char) getShort(m_strings, offset));
}
return result.toString();
}
/**
* Not yet implemented.
* <p/>
* 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 raw;
}
StringBuilder html = new StringBuilder(raw.length() + 32);
int offset = 0;
while (true) {
int i = -1;
for (int 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 (int j = 0; j != style.length; j += 3) {
int end = style[j + 2];
if (end == -1 || end >= start) {
continue;
}
if (offset <= end) {
html.append(raw, offset, end + 1);
offset = end + 1;
}
style[j + 2] = -1;
html.append('<');
html.append('/');
html.append(getString(style[j]));
html.append('>');
}
if (offset < start) {
html.append(raw, offset, start);
offset = start;
}
if (i == -1) {
break;
}
html.append('<');
html.append(getString(style[i]));
html.append('>');
style[i + 1] = -1;
}
return html.toString();
}
/**
* 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 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 int[] m_stringOffsets;
private int[] m_strings;
private int[] m_styleOffsets;
private int[] m_styles;
private static final int CHUNK_TYPE = 0x001C0001;
}