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BufferedDecoder.javaAPI DocAzureus 3.0.3.42113Tue Jun 08 05:13:00 BST 2004org.bouncycastle.util.encoders

BufferedDecoder

public class BufferedDecoder extends Object
a buffering class to allow translation from one format to another to be done in discrete chunks.

Fields Summary
protected byte[]
buf
protected int
bufOff
protected Translator
translator
Constructors Summary
public BufferedDecoder(Translator translator, int bufSize)

param
translator the translator to use.
param
bufSize amount of input to buffer for each chunk.

        this.translator = translator;

        if ((bufSize % translator.getEncodedBlockSize()) != 0)
        {
            throw new IllegalArgumentException("buffer size not multiple of input block size");
        }

        buf = new byte[bufSize];
        bufOff = 0;
Methods Summary
public intprocessByte(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 intprocessBytes(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;