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BufferedDecoder.javaAPI DocAndroid 1.5 API2188Wed May 06 22:41:06 BST 2009org.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;