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StringItems.java
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StringItems.java
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/*
* Copyright (c) 2009-2013 Panxiaobo
*
* 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 pxb.android;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
@SuppressWarnings("serial")
public class StringItems extends ArrayList<StringItem> {
private static final int UTF8_FLAG = 0x00000100;
public static String[] read(ByteBuffer in) throws IOException {
int trunkOffset = in.position() - 8;
int stringCount = in.getInt();
int styleOffsetCount = in.getInt();
int flags = in.getInt();
int stringDataOffset = in.getInt();
int stylesOffset = in.getInt();
int offsets[] = new int[stringCount];
String strings[] = new String[stringCount];
for (int i = 0; i < stringCount; i++) {
offsets[i] = in.getInt();
}
int base = trunkOffset + stringDataOffset;
for (int i = 0; i < offsets.length; i++) {
in.position(base + offsets[i]);
String s;
if (0 != (flags & UTF8_FLAG)) {
u8length(in); // ignored
int u8len = u8length(in);
int start = in.position();
int blength = u8len;
while (in.get(start + blength) != 0) {
blength++;
}
s = new String(in.array(), start, blength, "UTF-8");
} else {
int length = u16length(in);
s = new String(in.array(), in.position(), length * 2, "UTF-16LE");
}
strings[i] = s;
}
return strings;
}
static int u16length(ByteBuffer in) {
int length = in.getShort() & 0xFFFF;
if (length > 0x7FFF) {
length = ((length & 0x7FFF) << 8) | (in.getShort() & 0xFFFF);
}
return length;
}
static int u8length(ByteBuffer in) {
int len = in.get() & 0xFF;
if ((len & 0x80) != 0) {
len = ((len & 0x7F) << 8) | (in.get() & 0xFF);
}
return len;
}
byte[] stringData;
public int getSize() {
return 5 * 4 + this.size() * 4 + stringData.length + 0;// TODO
}
public void prepare() throws IOException {
for (StringItem s : this) {
if (s.data.length() > 0x7FFF) {
useUTF8 = false;
}
}
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int i = 0;
int offset = 0;
baos.reset();
Map<String, Integer> map = new HashMap<String, Integer>();
for (StringItem item : this) {
item.index = i++;
String stringData = item.data;
Integer of = map.get(stringData);
if (of != null) {
item.dataOffset = of;
} else {
item.dataOffset = offset;
map.put(stringData, offset);
if (useUTF8) {
int length = stringData.length();
byte[] data = stringData.getBytes("UTF-8");
int u8lenght = data.length;
if (length > 0x7F) {
offset++;
baos.write((length >> 8) | 0x80);
}
baos.write(length);
if (u8lenght > 0x7F) {
offset++;
baos.write((u8lenght >> 8) | 0x80);
}
baos.write(u8lenght);
baos.write(data);
baos.write(0);
offset += 3 + u8lenght;
} else {
int length = stringData.length();
byte[] data = stringData.getBytes("UTF-16LE");
if (length > 0x7FFF) {
int x = (length >> 16) | 0x8000;
baos.write(x);
baos.write(x >> 8);
offset += 2;
}
baos.write(length);
baos.write(length >> 8);
baos.write(data);
baos.write(0);
baos.write(0);
offset += 4 + data.length;
}
}
}
// TODO
stringData = baos.toByteArray();
}
private boolean useUTF8 = true;
public void write(ByteBuffer out) throws IOException {
out.putInt(this.size());
out.putInt(0);// TODO style count
out.putInt(useUTF8 ? UTF8_FLAG : 0);
out.putInt(7 * 4 + this.size() * 4);
out.putInt(0);
for (StringItem item : this) {
out.putInt(item.dataOffset);
}
out.put(stringData);
// TODO
}
}