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sk89q
316
src/main/java/com/sk89q/jnbt/NBTOutputStream.java
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src/main/java/com/sk89q/jnbt/NBTOutputStream.java
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package com.sk89q.jnbt;
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import java.io.Closeable;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.util.List;
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import java.util.zip.GZIPOutputStream;
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import com.sk89q.jnbt.ByteArrayTag;
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import com.sk89q.jnbt.ByteTag;
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import com.sk89q.jnbt.CompoundTag;
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import com.sk89q.jnbt.DoubleTag;
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import com.sk89q.jnbt.EndTag;
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import com.sk89q.jnbt.FloatTag;
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import com.sk89q.jnbt.IntTag;
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import com.sk89q.jnbt.ListTag;
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import com.sk89q.jnbt.LongTag;
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import com.sk89q.jnbt.NBTConstants;
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import com.sk89q.jnbt.NBTUtils;
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import com.sk89q.jnbt.ShortTag;
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import com.sk89q.jnbt.StringTag;
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import com.sk89q.jnbt.Tag;
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/*
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* JNBT License
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*
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* Copyright (c) 2010 Graham Edgecombe
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of the JNBT team nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* <p>
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* This class writes <strong>NBT</strong>, or <strong>Named Binary Tag</strong>
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* <code>Tag</code> objects to an underlying <code>OutputStream</code>.
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* </p>
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*
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* <p>
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* The NBT format was created by Markus Persson, and the specification may be
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* found at <a href="http://www.minecraft.net/docs/NBT.txt">
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* http://www.minecraft.net/docs/NBT.txt</a>.
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* </p>
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*
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* @author Graham Edgecombe
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*
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*/
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public final class NBTOutputStream implements Closeable {
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/**
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* The output stream.
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*/
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private final DataOutputStream os;
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/**
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* Creates a new <code>NBTOutputStream</code>, which will write data to the
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* specified underlying output stream.
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*
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* @param os
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* The output stream.
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* @throws IOException
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* if an I/O error occurs.
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*/
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public NBTOutputStream(OutputStream os) throws IOException {
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this.os = new DataOutputStream(new GZIPOutputStream(os));
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}
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/**
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* Writes a tag.
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*
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* @param tag
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* The tag to write.
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* @throws IOException
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* if an I/O error occurs.
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*/
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public void writeTag(Tag tag) throws IOException {
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int type = NBTUtils.getTypeCode(tag.getClass());
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String name = tag.getName();
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byte[] nameBytes = name.getBytes(NBTConstants.CHARSET);
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os.writeByte(type);
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os.writeShort(nameBytes.length);
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os.write(nameBytes);
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if (type == NBTConstants.TYPE_END) {
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throw new IOException("Named TAG_End not permitted.");
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}
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writeTagPayload(tag);
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}
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/**
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* Writes tag payload.
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*
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* @param tag
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* The tag.
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* @throws IOException
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* if an I/O error occurs.
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*/
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private void writeTagPayload(Tag tag) throws IOException {
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int type = NBTUtils.getTypeCode(tag.getClass());
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switch (type) {
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case NBTConstants.TYPE_END:
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writeEndTagPayload((EndTag) tag);
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break;
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case NBTConstants.TYPE_BYTE:
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writeByteTagPayload((ByteTag) tag);
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break;
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case NBTConstants.TYPE_SHORT:
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writeShortTagPayload((ShortTag) tag);
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break;
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case NBTConstants.TYPE_INT:
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writeIntTagPayload((IntTag) tag);
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break;
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case NBTConstants.TYPE_LONG:
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writeLongTagPayload((LongTag) tag);
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break;
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case NBTConstants.TYPE_FLOAT:
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writeFloatTagPayload((FloatTag) tag);
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break;
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case NBTConstants.TYPE_DOUBLE:
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writeDoubleTagPayload((DoubleTag) tag);
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break;
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case NBTConstants.TYPE_BYTE_ARRAY:
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writeByteArrayTagPayload((ByteArrayTag) tag);
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break;
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case NBTConstants.TYPE_STRING:
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writeStringTagPayload((StringTag) tag);
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break;
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case NBTConstants.TYPE_LIST:
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writeListTagPayload((ListTag) tag);
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break;
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case NBTConstants.TYPE_COMPOUND:
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writeCompoundTagPayload((CompoundTag) tag);
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break;
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default:
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throw new IOException("Invalid tag type: " + type + ".");
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}
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}
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/**
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* Writes a <code>TAG_Byte</code> tag.
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*
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* @param tag
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* The tag.
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* @throws IOException
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* if an I/O error occurs.
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*/
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private void writeByteTagPayload(ByteTag tag) throws IOException {
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os.writeByte(tag.getValue());
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}
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/**
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* Writes a <code>TAG_Byte_Array</code> tag.
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*
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* @param tag
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* The tag.
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* @throws IOException
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* if an I/O error occurs.
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*/
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private void writeByteArrayTagPayload(ByteArrayTag tag) throws IOException {
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byte[] bytes = tag.getValue();
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os.writeInt(bytes.length);
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os.write(bytes);
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}
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/**
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* Writes a <code>TAG_Compound</code> tag.
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*
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* @param tag
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* The tag.
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* @throws IOException
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* if an I/O error occurs.
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*/
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private void writeCompoundTagPayload(CompoundTag tag) throws IOException {
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for (Tag childTag : tag.getValue().values()) {
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writeTag(childTag);
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}
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os.writeByte((byte) 0); // end tag - better way?
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}
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/**
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* Writes a <code>TAG_List</code> tag.
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*
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* @param tag
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* The tag.
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* @throws IOException
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* if an I/O error occurs.
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*/
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private void writeListTagPayload(ListTag tag) throws IOException {
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Class<? extends Tag> clazz = tag.getType();
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List<Tag> tags = tag.getValue();
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int size = tags.size();
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os.writeByte(NBTUtils.getTypeCode(clazz));
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os.writeInt(size);
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for (int i = 0; i < size; i++) {
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writeTagPayload(tags.get(i));
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}
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}
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/**
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* Writes a <code>TAG_String</code> tag.
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*
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* @param tag
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* The tag.
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* @throws IOException
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* if an I/O error occurs.
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*/
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private void writeStringTagPayload(StringTag tag) throws IOException {
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byte[] bytes = tag.getValue().getBytes(NBTConstants.CHARSET);
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os.writeShort(bytes.length);
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os.write(bytes);
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}
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/**
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* Writes a <code>TAG_Double</code> tag.
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*
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* @param tag
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* The tag.
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* @throws IOException
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* if an I/O error occurs.
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*/
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private void writeDoubleTagPayload(DoubleTag tag) throws IOException {
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os.writeDouble(tag.getValue());
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}
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/**
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* Writes a <code>TAG_Float</code> tag.
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*
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* @param tag
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* The tag.
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* @throws IOException
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* if an I/O error occurs.
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*/
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private void writeFloatTagPayload(FloatTag tag) throws IOException {
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os.writeFloat(tag.getValue());
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}
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/**
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* Writes a <code>TAG_Long</code> tag.
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*
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* @param tag
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* The tag.
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* @throws IOException
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* if an I/O error occurs.
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*/
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private void writeLongTagPayload(LongTag tag) throws IOException {
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os.writeLong(tag.getValue());
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}
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/**
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* Writes a <code>TAG_Int</code> tag.
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*
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* @param tag
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* The tag.
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* @throws IOException
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* if an I/O error occurs.
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*/
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private void writeIntTagPayload(IntTag tag) throws IOException {
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os.writeInt(tag.getValue());
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}
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/**
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* Writes a <code>TAG_Short</code> tag.
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*
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* @param tag
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* The tag.
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* @throws IOException
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* if an I/O error occurs.
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*/
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private void writeShortTagPayload(ShortTag tag) throws IOException {
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os.writeShort(tag.getValue());
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}
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/**
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* Writes a <code>TAG_Empty</code> tag.
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*
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* @param tag
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* The tag.
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* @throws IOException
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* if an I/O error occurs.
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*/
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private void writeEndTagPayload(EndTag tag) {
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/* empty */
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}
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public void close() throws IOException {
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os.close();
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}
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}
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