package?download.bt;

import?java.io.BufferedInputStream;
import?java.io.ByteArrayInputStream;
import?java.io.File;
import?java.io.FileInputStream;
import?java.io.FileWriter;
import?java.io.IOException;
import?java.io.InputStream;
import?java.io.PrintWriter;
import?java.nio.ByteBuffer;
import?java.nio.CharBuffer;
import?java.nio.charset.Charset;
import?java.util.ArrayList;
import?java.util.HashMap;
import?java.util.Iterator;
import?java.util.List;
import?java.util.Map;

/**
?*?解析bt種子
?*/
@SuppressWarnings（value?=?{?“rawtypes“?“unchecked“?“unused“?}）
public?class?BDecoder?{
	public?static?Charset?BYTE_CHARSET?=?Charset.forName（“UTF-8“）;;
	public?static?Charset?DEFAULT_CHARSET?=?Charset.forName（“UTF-8“）;;
	private?boolean?recovery_mode;
	public?static?Map?decode（byte[]?data）?throws?IOException?{
		return?（new?BDecoder（）.decodeByteArray（data））;
	}
	public?static?Map?decode（BufferedInputStream?is）?throws?IOException?{
		return?（new?BDecoder（）.decodeStream（is））;
	}
	public?BDecoder（）?{
	}
	public?Map?decodeByteArray（byte[]?data）?throws?IOException?{
		return?（decode（new?ByteArrayInputStream（data）））;
	}
	public?Map?decodeStream（BufferedInputStream?data）?throws?IOException?{
		object?res?=?decodeInputStream（data?0）;
		if?（res?==?null）?{
			throw?（new?IOException（“BDecoder:?zero?length?file“））;
		}?else?if?（!（res?instanceof?Map））?{
			throw?（new?IOException（“BDecoder:?top?level?isn‘t?a?Map“））;
		}
		return?（（Map）?res）;
	}
	private?Map?decode（ByteArrayInputStream?data）?throws?IOException?{
		object?res?=?decodeInputStream（data?0）;

		if?（res?==?null）?{
			throw?（new?IOException（“BDecoder:?zero?length?file“））;
		}?else?if?（!（res?instanceof?Map））?{
			throw?（new?IOException（“BDecoder:?top?level?isn‘t?a?Map“））;
		}

		return?（（Map）?res）;
	}

	private?object?decodeInputStream（InputStream?bais?int?nesting）

	throws?IOException?{
		if?（nesting?==?0?&&?!bais.markSupported（））?{
			throw?new?IOException（“InputStream?must?support?the?mark（）?method“）;
		}
		//?set?a?mark
		bais.mark（Integer.MAX_VALUE）;
		//?read?a?byte
		int?tempByte?=?bais.read（）;
		//?decide?what?to?do
		switch?（tempByte）?{
		case?‘d‘:
			//?create?a?new?dictionary?object
			Map?tempMap?=?new?HashMap（）;
			try?{
				//?get?the?key
				byte[]?tempByteArray?=?null;
				while?（（tempByteArray?=?（byte[]）?decodeInputStream（bais?nesting?+?1））?!=?null）?{
					//?decode?some?more
					object?value?=?decodeInputStream（bais?nesting?+?1）;
					//?add?the?value?to?the?map
					CharBuffer?cb?=?BYTE_CHARSET.decode（ByteBuffer.wrap（tempByteArray））;
					String?key?=?new?String（cb.array（）?0?cb.limit（））;
					tempMap.put（key?value）;
				}
				bais.mark（Integer.MAX_VALUE）;
				tempByte?=?bais.read（）;
				bais.reset（）;
				if?（nesting?>?0?&&?tempByte?==?-1）?{
					throw?（new?IOException（“BDecoder:?invalid?input?data?‘e‘?missing?from?end?of?dictionary“））;
				}
			}?catch?（Throwable?e）?{
				if?（!recovery_mode）?{