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The Bouncy Castle Java APIs for the TLS, including a JSSE provider. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.tls;

import java.io.InputStream;

/**
 * InputStream based on a ByteQueue implementation.
 */
public class ByteQueueInputStream
    extends InputStream
{
    private ByteQueue buffer;

    public ByteQueueInputStream()
    {
        buffer = new ByteQueue();
    }

    public void addBytes(byte[] buf)
    {
        buffer.addData(buf, 0, buf.length);
    }

    public void addBytes(byte[] buf, int bufOff, int bufLen)
    {
        buffer.addData(buf, bufOff, bufLen);
    }

    public int peek(byte[] buf)
    {
        int bytesToRead = Math.min(buffer.available(), buf.length);
        buffer.read(buf, 0, bytesToRead, 0);
        return bytesToRead;
    }

    public int read()
    {
        if (buffer.available() == 0)
        {
            return -1;
        }
        return buffer.removeData(1, 0)[0] & 0xFF;
    }

    public int read(byte[] b)
    {
        return read(b, 0, b.length);
    }

    public int read(byte[] b, int off, int len)
    {
        int bytesToRead = Math.min(buffer.available(), len);
        buffer.removeData(b, off, bytesToRead, 0);
        return bytesToRead;
    }

    public long skip(long n)
    {
        int bytesToRemove = Math.min((int)n, buffer.available());
        buffer.removeData(bytesToRemove);
        return bytesToRemove;
    }

    public int available()
    {
        return buffer.available();
    }

    public void close()
    {
    }
}