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SSLInputStream


org.apache.harmony.xnet.provider.jsse

Class SSLInputStream

  • All Implemented Interfaces:
    Closeable, AutoCloseable
    Direct Known Subclasses:
    HandshakeIODataStream, SSLBufferedInput, SSLStreamedInput


    public abstract class SSLInputStream
    extends InputStream
    This class is a base for all input stream classes used in protocol implementation. It extends an InputStream with some additional read methods allowing to read TLS specific data types such as uint8, uint32 etc (see TLS v 1 specification at http://www.ietf.org/rfc/rfc2246.txt).
    • Constructor Detail

      • SSLInputStream

        public SSLInputStream()
    • Method Detail

      • available

        public abstract int available()
                               throws IOException
        Description copied from class: InputStream
        Returns an estimated number of bytes that can be read or skipped without blocking for more input.

        Note that this method provides such a weak guarantee that it is not very useful in practice.

        Firstly, the guarantee is "without blocking for more input" rather than "without blocking": a read may still block waiting for I/O to complete — the guarantee is merely that it won't have to wait indefinitely for data to be written. The result of this method should not be used as a license to do I/O on a thread that shouldn't be blocked.

        Secondly, the result is a conservative estimate and may be significantly smaller than the actual number of bytes available. In particular, an implementation that always returns 0 would be correct. In general, callers should only use this method if they'd be satisfied with treating the result as a boolean yes or no answer to the question "is there definitely data ready?".

        Thirdly, the fact that a given number of bytes is "available" does not guarantee that a read or skip will actually read or skip that many bytes: they may read or skip fewer.

        It is particularly important to realize that you must not use this method to size a container and assume that you can read the entirety of the stream without needing to resize the container. Such callers should probably write everything they read to a ByteArrayOutputStream and convert that to a byte array. Alternatively, if you're reading from a file, File.length() returns the current length of the file (though assuming the file's length can't change may be incorrect, reading a file is inherently racy).

        The default implementation of this method in InputStream always returns 0. Subclasses should override this method if they are able to indicate the number of bytes available.

        Overrides:
        available in class InputStream
        Returns:
        the estimated number of bytes available
        Throws:
        IOException - if this stream is closed or an error occurs
      • read

        public abstract int read()
                          throws IOException
        Reads the following byte value. Note that in the case of reaching of the end of the data this methods throws the exception, not return -1. The type of exception depends on implementation. It was done for simplifying and speeding up of processing of such cases.
        Specified by:
        read in class InputStream
        Returns:
        the byte read or -1 if the end of stream has been reached.
        Throws:
        IOException - if the stream is closed or another IOException occurs.
        See Also:
        SSLStreamedInput.read(), SSLBufferedInput.read(), HandshakeIODataStream.read()
      • read

        public byte[] read(int length)
                    throws IOException
        Returns the vector of opaque values of specified length;
        Parameters:
        length - - the length of the vector to be read.
        Returns:
        the read data
        Throws:
        IOException - if read operation could not be finished.
      • read

        public int read(byte[] b,
               int off,
               int len)
                 throws IOException
        Description copied from class: InputStream
        Reads at most length bytes from this stream and stores them in the byte array b starting at offset.
        Overrides:
        read in class InputStream
        Parameters:
        b - the byte array in which to store the bytes read.
        off - the initial position in buffer to store the bytes read from this stream.
        len - the maximum number of bytes to store in b.
        Returns:
        the number of bytes actually read or -1 if the end of the stream has been reached.
        Throws:
        IOException - if the stream is closed or another IOException occurs.


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