buffereddecoder.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:   BufferedDecoder.java

package org.bouncycastle.util.encoders;


// Referenced classes of package org.bouncycastle.util.encoders:
//			Translator

public class BufferedDecoder
{

	protected byte buf[];
	protected int bufOff;
	protected Translator translator;

	public BufferedDecoder(Translator translator, int bufSize)
	{
		this.translator = translator;
		if (bufSize % translator.getEncodedBlockSize() != 0)
		{
			throw new IllegalArgumentException("buffer size not multiple of input block size");
		} else
		{
			buf = new byte[bufSize];
			bufOff = 0;
			return;
		}
	}

	public int processByte(byte in, byte out[], int outOff)
	{
		int resultLen = 0;
		buf[bufOff++] = in;
		if (bufOff == buf.length)
		{
			resultLen = translator.decode(buf, 0, buf.length, out, outOff);
			bufOff = 0;
		}
		return resultLen;
	}

	public int processBytes(byte in[], int inOff, int len, byte out[], int outOff)
	{
		if (len < 0)
			throw new IllegalArgumentException("Can't have a negative input length!");
		int resultLen = 0;
		int gapLen = buf.length - bufOff;
		if (len > gapLen)
		{
			System.arraycopy(in, inOff, buf, bufOff, gapLen);
			resultLen += translator.decode(buf, 0, buf.length, out, outOff);
			bufOff = 0;
			len -= gapLen;
			inOff += gapLen;
			outOff += resultLen;
			int chunkSize = len - len % buf.length;
			resultLen += translator.decode(in, inOff, chunkSize, out, outOff);
			len -= chunkSize;
			inOff += chunkSize;
		}
		if (len != 0)
		{
			System.arraycopy(in, inOff, buf, bufOff, len);
			bufOff += len;
		}
		return resultLen;
	}
}