package com.sk89q.jnbt; import java.io.Closeable; import java.io.DataOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.List; import java.util.zip.GZIPOutputStream; import com.sk89q.jnbt.ByteArrayTag; import com.sk89q.jnbt.ByteTag; import com.sk89q.jnbt.CompoundTag; import com.sk89q.jnbt.DoubleTag; import com.sk89q.jnbt.EndTag; import com.sk89q.jnbt.FloatTag; import com.sk89q.jnbt.IntTag; import com.sk89q.jnbt.ListTag; import com.sk89q.jnbt.LongTag; import com.sk89q.jnbt.NBTConstants; import com.sk89q.jnbt.NBTUtils; import com.sk89q.jnbt.ShortTag; import com.sk89q.jnbt.StringTag; import com.sk89q.jnbt.Tag; /* * JNBT License * * Copyright (c) 2010 Graham Edgecombe * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * * Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * * Neither the name of the JNBT team nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /** *
* This class writes NBT, or Named Binary Tag
* Tag
objects to an underlying OutputStream
.
*
* The NBT format was created by Markus Persson, and the specification may be * found at * http://www.minecraft.net/docs/NBT.txt. *
* * @author Graham Edgecombe * */ public final class NBTOutputStream implements Closeable { /** * The output stream. */ private final DataOutputStream os; /** * Creates a newNBTOutputStream
, which will write data to the
* specified underlying output stream.
*
* @param os
* The output stream.
* @throws IOException
* if an I/O error occurs.
*/
public NBTOutputStream(OutputStream os) throws IOException {
this.os = new DataOutputStream(new GZIPOutputStream(os));
}
/**
* Writes a tag.
*
* @param tag
* The tag to write.
* @throws IOException
* if an I/O error occurs.
*/
public void writeTag(Tag tag) throws IOException {
int type = NBTUtils.getTypeCode(tag.getClass());
String name = tag.getName();
byte[] nameBytes = name.getBytes(NBTConstants.CHARSET);
os.writeByte(type);
os.writeShort(nameBytes.length);
os.write(nameBytes);
if (type == NBTConstants.TYPE_END) {
throw new IOException("Named TAG_End not permitted.");
}
writeTagPayload(tag);
}
/**
* Writes tag payload.
*
* @param tag
* The tag.
* @throws IOException
* if an I/O error occurs.
*/
private void writeTagPayload(Tag tag) throws IOException {
int type = NBTUtils.getTypeCode(tag.getClass());
switch (type) {
case NBTConstants.TYPE_END:
writeEndTagPayload((EndTag) tag);
break;
case NBTConstants.TYPE_BYTE:
writeByteTagPayload((ByteTag) tag);
break;
case NBTConstants.TYPE_SHORT:
writeShortTagPayload((ShortTag) tag);
break;
case NBTConstants.TYPE_INT:
writeIntTagPayload((IntTag) tag);
break;
case NBTConstants.TYPE_LONG:
writeLongTagPayload((LongTag) tag);
break;
case NBTConstants.TYPE_FLOAT:
writeFloatTagPayload((FloatTag) tag);
break;
case NBTConstants.TYPE_DOUBLE:
writeDoubleTagPayload((DoubleTag) tag);
break;
case NBTConstants.TYPE_BYTE_ARRAY:
writeByteArrayTagPayload((ByteArrayTag) tag);
break;
case NBTConstants.TYPE_STRING:
writeStringTagPayload((StringTag) tag);
break;
case NBTConstants.TYPE_LIST:
writeListTagPayload((ListTag) tag);
break;
case NBTConstants.TYPE_COMPOUND:
writeCompoundTagPayload((CompoundTag) tag);
break;
case NBTConstants.TYPE_INT_ARRAY:
writeIntArrayTagPayload((IntArrayTag) tag);
default:
throw new IOException("Invalid tag type: " + type + ".");
}
}
/**
* Writes a TAG_Byte
tag.
*
* @param tag
* The tag.
* @throws IOException
* if an I/O error occurs.
*/
private void writeByteTagPayload(ByteTag tag) throws IOException {
os.writeByte(tag.getValue());
}
/**
* Writes a TAG_Byte_Array
tag.
*
* @param tag
* The tag.
* @throws IOException
* if an I/O error occurs.
*/
private void writeByteArrayTagPayload(ByteArrayTag tag) throws IOException {
byte[] bytes = tag.getValue();
os.writeInt(bytes.length);
os.write(bytes);
}
/**
* Writes a TAG_Compound
tag.
*
* @param tag
* The tag.
* @throws IOException
* if an I/O error occurs.
*/
private void writeCompoundTagPayload(CompoundTag tag) throws IOException {
for (Tag childTag : tag.getValue().values()) {
writeTag(childTag);
}
os.writeByte((byte) 0); // end tag - better way?
}
/**
* Writes a TAG_List
tag.
*
* @param tag
* The tag.
* @throws IOException
* if an I/O error occurs.
*/
private void writeListTagPayload(ListTag tag) throws IOException {
Class extends Tag> clazz = tag.getType();
ListTAG_String
tag.
*
* @param tag
* The tag.
* @throws IOException
* if an I/O error occurs.
*/
private void writeStringTagPayload(StringTag tag) throws IOException {
byte[] bytes = tag.getValue().getBytes(NBTConstants.CHARSET);
os.writeShort(bytes.length);
os.write(bytes);
}
/**
* Writes a TAG_Double
tag.
*
* @param tag
* The tag.
* @throws IOException
* if an I/O error occurs.
*/
private void writeDoubleTagPayload(DoubleTag tag) throws IOException {
os.writeDouble(tag.getValue());
}
/**
* Writes a TAG_Float
tag.
*
* @param tag
* The tag.
* @throws IOException
* if an I/O error occurs.
*/
private void writeFloatTagPayload(FloatTag tag) throws IOException {
os.writeFloat(tag.getValue());
}
/**
* Writes a TAG_Long
tag.
*
* @param tag
* The tag.
* @throws IOException
* if an I/O error occurs.
*/
private void writeLongTagPayload(LongTag tag) throws IOException {
os.writeLong(tag.getValue());
}
/**
* Writes a TAG_Int
tag.
*
* @param tag
* The tag.
* @throws IOException
* if an I/O error occurs.
*/
private void writeIntTagPayload(IntTag tag) throws IOException {
os.writeInt(tag.getValue());
}
/**
* Writes a TAG_Short
tag.
*
* @param tag
* The tag.
* @throws IOException
* if an I/O error occurs.
*/
private void writeShortTagPayload(ShortTag tag) throws IOException {
os.writeShort(tag.getValue());
}
/**
* Writes a TAG_Empty
tag.
*
* @param tag
* The tag.
* @throws IOException
* if an I/O error occurs.
*/
private void writeEndTagPayload(EndTag tag) {
/* empty */
}
private void writeIntArrayTagPayload(IntArrayTag tag) throws IOException {
int[] data = tag.getValue();
os.writeInt(data.length);
for (int i = 0; i < data.length; i++) {
os.writeInt(data[i]);
}
}
public void close() throws IOException {
os.close();
}
}