This value is always in the range 0 through count. If it is less than count, then buf[pos] is the next byte to be supplied as input; if it is equal to count, then the next read or skip operation will require more bytes to be read from the contained input stream.

Also see:

java.io.BufferedInputStream#buf

This value is always in the range -1 through pos. If there is no marked position in the input stream, this field is -1. If there is a marked position in the input stream, then buf[markpos] is the first byte to be supplied as input after a reset operation. If markpos is not -1, then all bytes from positions buf[markpos] through buf[pos-1] must remain in the buffer array (though they may be moved to another place in the buffer array, with suitable adjustments to the values of count, pos, and markpos); they may not be discarded unless and until the difference between pos and markpos exceeds marklimit.

Also see:

java.io.BufferedInputStream#mark(int)
java.io.BufferedInputStream#pos

Also see:

java.io.BufferedInputStream#mark(int)
java.io.BufferedInputStream#reset()

 public BufferedInputStream(InputStream in) 
{
        this(in, defaultBufferSize);
}

Creates a BufferedInputStream and saves its argument, the input stream in, for later use. An internal buffer array is created and stored in buf.

Parameters:

in - the underlying input stream.

 public BufferedInputStream(InputStream in,
    int size) 
{
        super(in);
        if (size < = 0) {
            throw new IllegalArgumentException("Buffer size < = 0");
        }
        buf = new byte[size];
}

Creates a BufferedInputStream with the specified buffer size, and saves its argument, the input stream in, for later use. An internal buffer array of length size is created and stored in buf.

Parameters:

in - the underlying input stream.

size - the buffer size.

Throws:

IllegalArgumentException - if size <= 0.

exception: IllegalArgumentException - if size <= 0.

 public synchronized int available() throws IOException 
{
        int n = count - pos;
        int avail = getInIfOpen().available();
        return n  > (Integer.MAX_VALUE - avail)
                    ? Integer.MAX_VALUE
                    : n + avail;
}

Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking by the next invocation of a method for this input stream. The next invocation might be the same thread or another thread. A single read or skip of this many bytes will not block, but may read or skip fewer bytes.

This method returns the sum of the number of bytes remaining to be read in the buffer (count - pos) and the result of calling the in .available().

 public  void close() throws IOException 
{
        byte[] buffer;
        while ( (buffer = buf) != null) {
            if (bufUpdater.compareAndSet(this, buffer, null)) {
                InputStream input = in;
                in = null;
                if (input != null)
                    input.close();
                return;
            }
            // Else retry in case a new buf was CASed in fill()
        }
}

Closes this input stream and releases any system resources associated with the stream. Once the stream has been closed, further read(), available(), reset(), or skip() invocations will throw an IOException. Closing a previously closed stream has no effect.

 public synchronized  void mark(int readlimit) 
{
        marklimit = readlimit;
        markpos = pos;
}

See the general contract of the mark method of InputStream.

 public boolean markSupported() 
{
        return true;
}

Tests if this input stream supports the mark and reset methods. The markSupported method of BufferedInputStream returns true.

 public synchronized int read() throws IOException 
{
        if (pos  >= count) {
            fill();
            if (pos  >= count)
                return -1;
        }
        return getBufIfOpen()[pos++] & 0xff;
}

See the general contract of the read method of InputStream.

 public synchronized int read(byte[] b,
    int off,
    int len) throws IOException 
{
        getBufIfOpen(); // Check for closed stream
        if ((off | len | (off + len) | (b.length - (off + len))) <  0) {
            throw new IndexOutOfBoundsException();
        } else if (len == 0) {
            return 0;
        }
        int n = 0;
        for (;;) {
            int nread = read1(b, off + n, len - n);
            if (nread < = 0)
                return (n == 0) ? nread : n;
            n += nread;
            if (n  >= len)
                return n;
            // if not closed but no bytes available, return
            InputStream input = in;
            if (input != null && input.available() < = 0)
                return n;
        }
}

Reads bytes from this byte-input stream into the specified byte array, starting at the given offset.

This method implements the general contract of the corresponding read method of the InputStream class. As an additional convenience, it attempts to read as many bytes as possible by repeatedly invoking the read method of the underlying stream. This iterated read continues until one of the following conditions becomes true:

• The specified number of bytes have been read,
• The read method of the underlying stream returns -1, indicating end-of-file, or
• The available method of the underlying stream returns zero, indicating that further input requests would block.
If the first read on the underlying stream returns -1 to indicate end-of-file then this method returns -1. Otherwise this method returns the number of bytes actually read.

Subclasses of this class are encouraged, but not required, to attempt to read as many bytes as possible in the same fashion.

 public synchronized  void reset() throws IOException 
{
        getBufIfOpen(); // Cause exception if closed
        if (markpos <  0)
            throw new IOException("Resetting to invalid mark");
        pos = markpos;
}

See the general contract of the reset method of InputStream.

If markpos is -1 (no mark has been set or the mark has been invalidated), an IOException is thrown. Otherwise, pos is set equal to markpos.

 public synchronized long skip(long n) throws IOException 
{
        getBufIfOpen(); // Check for closed stream
        if (n < = 0) {
            return 0;
        }
        long avail = count - pos;
        if (avail < = 0) {
            // If no mark position set then don't keep in buffer
            if (markpos < 0)
                return getInIfOpen().skip(n);
            // Fill in buffer to save bytes for reset
            fill();
            avail = count - pos;
            if (avail < = 0)
                return 0;
        }
        long skipped = (avail <  n) ? avail : n;
        pos += skipped;
        return skipped;
}

See the general contract of the skip method of InputStream.