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Base64InputStream


android.util

Class Base64InputStream

    • Constructor Summary

      Constructors
      Constructor and Description
      Base64InputStream(InputStream in, int flags)
      An InputStream that performs Base64 decoding on the data read from the wrapped stream.
      Base64InputStream(InputStream in, int flags, boolean encode)
      Performs Base64 encoding or decoding on the data read from the wrapped InputStream.
    • Method Summary

      Methods
      Modifier and Type Method and Description
      int available()
      Returns an estimated number of bytes that can be read or skipped without blocking for more input.
      void close()
      Closes this stream.
      void mark(int readlimit)
      Sets a mark position in this stream.
      boolean markSupported()
      Indicates whether this stream supports mark() and reset().
      int read()
      Reads a single byte from the filtered stream and returns it as an integer in the range from 0 to 255.
      int read(byte[] b, int off, int len)
      Reads at most count bytes from this stream and stores them in the byte array buffer starting at offset.
      void reset()
      Resets this stream to the last marked location.
      long skip(long n)
      Skips byteCount bytes in this stream.
    • Constructor Detail

      • Base64InputStream

        public Base64InputStream(InputStream in,
                         int flags)
        An InputStream that performs Base64 decoding on the data read from the wrapped stream.
        Parameters:
        in - the InputStream to read the source data from
        flags - bit flags for controlling the decoder; see the constants in Base64
      • Base64InputStream

        public Base64InputStream(InputStream in,
                         int flags,
                         boolean encode)
        Performs Base64 encoding or decoding on the data read from the wrapped InputStream.
        Parameters:
        in - the InputStream to read the source data from
        flags - bit flags for controlling the decoder; see the constants in Base64
        encode - true to encode, false to decode
    • Method Detail

      • mark

        public void mark(int readlimit)
        Description copied from class: FilterInputStream
        Sets a mark position in this stream. The parameter readlimit indicates how many bytes can be read before the mark is invalidated. Sending reset() will reposition this stream back to the marked position, provided that readlimit has not been surpassed.

        This implementation sets a mark in the filtered stream.

        Overrides:
        mark in class FilterInputStream
        Parameters:
        readlimit - the number of bytes that can be read from this stream before the mark is invalidated.
        See Also:
        FilterInputStream.markSupported(), FilterInputStream.reset()
      • available

        public int available()
        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 FilterInputStream
        Returns:
        the estimated number of bytes available
      • read

        public int read()
                 throws IOException
        Description copied from class: FilterInputStream
        Reads a single byte from the filtered stream and returns it as an integer in the range from 0 to 255. Returns -1 if the end of this stream has been reached.
        Overrides:
        read in class FilterInputStream
        Returns:
        the byte read or -1 if the end of the filtered stream has been reached.
        Throws:
        IOException - if the stream is closed or another IOException occurs.
      • read

        public int read(byte[] b,
               int off,
               int len)
                 throws IOException
        Description copied from class: FilterInputStream
        Reads at most count bytes from this stream and stores them in the byte array buffer starting at offset. Returns the number of bytes actually read or -1 if no bytes have been read and the end of this stream has been reached. This implementation reads bytes from the filtered stream.
        Overrides:
        read in class FilterInputStream
        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 buffer.
        Returns:
        the number of bytes actually read or -1 if the end of the filtered stream has been reached while reading.
        Throws:
        IOException - if this stream is closed or another I/O error occurs.


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