Class ByteArrayImageInputStream

java.lang.Object
javax.imageio.stream.ImageInputStreamImpl
org.monte.media.io.ImageInputStreamImpl2
org.monte.media.io.ByteArrayImageInputStream
All Implemented Interfaces:
Closeable, DataInput, AutoCloseable, ImageInputStream
public class ByteArrayImageInputStream extends ImageInputStreamImpl2
A ByteArrayImageInputStream contains an internal buffer that contains bytes that may be read from the stream. An internal counter keeps track of the next byte to be supplied by the read method.

Closing a ByteArrayImageInputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.

Author:
Werner Randelshofer, Hausmatt 10, CH-6405 Goldau

  • Field Details

    • buf

      protected byte[] buf
      An array of bytes that was provided by the creator of the stream. Elements buf[0] through buf[count-1] are the only bytes that can ever be read from the stream; element buf[streamPos] is the next byte to be read.

    • count

      protected int count
      The index one greater than the last valid character in the input stream buffer. This value should always be nonnegative and not larger than the length of buf. It is one greater than the position of the last byte within buf that can ever be read from the input stream buffer.

  • Constructor Details

    • ByteArrayImageInputStream

      public ByteArrayImageInputStream(byte[] buf)

    • ByteArrayImageInputStream

      public ByteArrayImageInputStream(byte[] buf, ByteOrder byteOrder)

    • ByteArrayImageInputStream

      public ByteArrayImageInputStream(byte[] buf, int offset, int length, ByteOrder byteOrder)

  • Method Details

    • read

      public int read()
      Reads the next byte of data from this input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned.

      This read method cannot block.

      Specified by:
      read in interface ImageInputStream
      Specified by:
      read in class ImageInputStreamImpl
      Returns:
      the next byte of data, or -1 if the end of the stream has been reached.

    • read

      public int read(byte[] b, int off, int len)
      Reads up to len bytes of data into an array of bytes from this input stream. If streamPos equals count, then -1 is returned to indicate end of file. Otherwise, the number k of bytes read is equal to the smaller of len and count-streamPos. If k is positive, then bytes buf[streamPos] through buf[streamPos+k-1] are copied into b[off] through b[off+k-1] in the manner performed by System.arraycopy. The value k is added into streamPos and k is returned.

      This read method cannot block.

      Specified by:
      read in interface ImageInputStream
      Specified by:
      read in class ImageInputStreamImpl
      Parameters:
      b - the buffer into which the data is read.
      off - the start offset in the destination array b
      len - the maximum number of bytes read.
      Returns:
      the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.
      Throws:
      NullPointerException - If b is null.
      IndexOutOfBoundsException - If off is negative, len is negative, or len is greater than b.length - off

    • skip

      public long skip(long n)
      Skips n bytes of input from this input stream. Fewer bytes might be skipped if the end of the input stream is reached. The actual number k of bytes to be skipped is equal to the smaller of n and count-streamPos. The value k is added into streamPos and k is returned.
      Parameters:
      n - the number of bytes to be skipped.
      Returns:
      the actual number of bytes skipped.

    • available

      public int available()
      Returns the number of remaining bytes that can be read (or skipped over) from this input stream.

      The value returned is count - streamPos, which is the number of bytes remaining to be read from the input buffer.

      Returns:
      the number of remaining bytes that can be read (or skipped over) from this input stream without blocking.

    • close

      public void close()
      Closing a ByteArrayInputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.

      Specified by:
      close in interface AutoCloseable
      Specified by:
      close in interface Closeable
      Specified by:
      close in interface ImageInputStream
      Overrides:
      close in class ImageInputStreamImpl

    • getStreamPosition

      public long getStreamPosition() throws IOException
      Specified by:
      getStreamPosition in interface ImageInputStream
      Overrides:
      getStreamPosition in class ImageInputStreamImpl
      Throws:
      IOException

    • seek

      public void seek(long pos) throws IOException
      Specified by:
      seek in interface ImageInputStream
      Overrides:
      seek in class ImageInputStreamImpl
      Throws:
      IOException

    • length

      public long length()
      Specified by:
      length in interface ImageInputStream
      Overrides:
      length in class ImageInputStreamImpl