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XOPSManipulator is a Java library that offers several functions to manipulate matters relating to X operations.

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package com.daxie.xops.bd1;

import java.io.BufferedOutputStream;
import java.io.DataOutputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

import com.daxie.basis.vector.Vector;
import com.daxie.log.LogFile;
import com.daxie.tool.ByteFunctions;
import com.daxie.tool.ExceptionFunctions;

/**
 * Writes data to a BD1 file.
 * @author Daba
 *
 */
class BD1Writer {
	private List blocks;
	private Map texture_filenames_map;
	
	public BD1Writer(List blocks,Map texture_filenames_map) {
		this.blocks=blocks;
		this.texture_filenames_map=texture_filenames_map;
	}
	
	public void Write(String bd1_filename) throws FileNotFoundException{
		if(blocks==null||texture_filenames_map==null) {
			LogFile.WriteWarn("[BD1Writer-Write] Data is null.",true);
			return;
		}
		
		DataOutputStream dos;
		dos=new DataOutputStream(
				new BufferedOutputStream(
						new FileOutputStream(bd1_filename)));
		
		try {
			//Texture filenames
			Map sorted_texture_filenames_map=new TreeMap<>(texture_filenames_map);
			
			int texture_count=0;
			for(int texture_id:sorted_texture_filenames_map.keySet()) {
				String texture_filename=sorted_texture_filenames_map.get(texture_id);
				if(texture_filename.length()>30) {
					texture_filename=texture_filename.substring(0, 30);
				}
				
				byte[] texture_filename_buffer=new byte[31];
				
				int pos;
				for(pos=0;pos