bergenerator.java

java 文件下载器。可自定义

// Decompiled by Jad v1.5.8e2. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://kpdus.tripod.com/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi space 
// Source File Name:   BERGenerator.java

package org.bouncycastle.asn1;

import java.io.*;

// Referenced classes of package org.bouncycastle.asn1:
//			ASN1Generator

public class BERGenerator extends ASN1Generator
{

	private boolean _tagged;
	private boolean _isExplicit;
	private int _tagNo;

	protected BERGenerator(OutputStream out)
	{
		super(out);
		_tagged = false;
	}

	public BERGenerator(OutputStream out, int tagNo, boolean isExplicit)
	{
		super(out);
		_tagged = false;
		_tagged = true;
		_isExplicit = isExplicit;
		_tagNo = tagNo;
	}

	public OutputStream getRawOutputStream()
	{
		return _out;
	}

	private void writeHdr(int tag)
		throws IOException
	{
		_out.write(tag);
		_out.write(128);
	}

	protected void writeBERHeader(int tag)
		throws IOException
	{
		if (_tagged)
		{
			int tagNum = _tagNo | 0x80;
			if (_isExplicit)
			{
				writeHdr(tagNum | 0x20);
				writeHdr(tag);
			} else
			if ((tag & 0x20) != 0)
				writeHdr(tagNum | 0x20);
			else
				writeHdr(tagNum);
		} else
		{
			writeHdr(tag);
		}
	}

	protected void writeBERBody(InputStream contentStream)
		throws IOException
	{
		int ch;
		while ((ch = contentStream.read()) >= 0) 
			_out.write(ch);
	}

	protected void writeBEREnd()
		throws IOException
	{
		_out.write(0);
		_out.write(0);
		if (_tagged && _isExplicit)
		{
			_out.write(0);
			_out.write(0);
		}
	}
}