org.w3c.tools.jpeg
Class JpegCommentWriter

java.lang.Object
  java.io.Writer
      org.w3c.tools.jpeg.JpegCommentWriter

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable, java.lang.Appendable

public class JpegCommentWriter
extends java.io.Writer

Allow you to write text comments to jpeg stream Some code has been adapted from wrjpgcom.c from The Independent JPEG Group

Field Summary

Fields inherited from class java.io.Writer

lock

Constructor Summary

JpegCommentWriter(java.io.OutputStream out, java.io.InputStream in)
Create a JpegCommentWriter, using an Input stream as the jpeg binary source, and writing in the output stream

JpegCommentWriter(java.io.OutputStream out, java.io.InputStream in, java.lang.String enc)
Create a JpegCommentWriter, using an Input stream as the jpeg binary source, and writing in the output stream

Method Summary

void	close()
protected void	dupFirstHeaders() the the first headers until a SOF parker is found
protected int	dupFirstMarker() copy the marker and return it
protected void	dupHeader(int marker) dup the marker and the body
void	flush()
java.lang.String	getEncoding() gets the encoding used by the comment writer
static void	main(java.lang.String[] args) The usual debugging tool
protected int	nextMarker() get the next marker, and eat extra bytes
protected int	read2bytes() read 2 bytes and create an integer out of it
protected void	skipVariable() skip the body after a marker
void	write(char[] buffer) write an array of characters
void	write(char[] buffer, int off, int len) write a portion of an array of characters
void	write(int ch) write one character
void	write(java.lang.String s) Write a String
void	write(java.lang.String s, int off, int len) Write a portion of a String
protected void	writeMarker(int marker)
protected void	writeMarkerLength(int len)

Methods inherited from class java.io.Writer

append, append, append

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JpegCommentWriter

public JpegCommentWriter(java.io.OutputStream out,
                         java.io.InputStream in)

Create a JpegCommentWriter, using an Input stream as the jpeg binary source, and writing in the output stream

Parameters:

out, - the output stream where the image will be written

in, - the input stream of the jpeg file, it MUST point to the beginning of the jpeg to avoid problems

JpegCommentWriter

public JpegCommentWriter(java.io.OutputStream out,
                         java.io.InputStream in,
                         java.lang.String enc)
                  throws java.io.UnsupportedEncodingException

Create a JpegCommentWriter, using an Input stream as the jpeg binary source, and writing in the output stream

Parameters:

out, - the output stream where the image will be written

in, - the input stream of the jpeg file, it MUST point to the beginning of the jpeg to avoid problems

enc, - the encoding name used when you write comments

Throws:

java.io.UnsupportedEncodingException

Method Detail

getEncoding

public java.lang.String getEncoding()

gets the encoding used by the comment writer

write

public void write(int ch)
           throws java.io.IOException

write one character

Overrides:

write in class java.io.Writer

Throws:

java.io.IOException

write

public void write(char[] buffer)
           throws java.io.IOException

write an array of characters

Overrides:

write in class java.io.Writer

Throws:

java.io.IOException

write

public void write(char[] buffer,
                  int off,
                  int len)
           throws java.io.IOException

write a portion of an array of characters

Specified by:

write in class java.io.Writer

Throws:

java.io.IOException

write

public void write(java.lang.String s)
           throws java.io.IOException

Write a String

Overrides:

write in class java.io.Writer

Throws:

java.io.IOException

write

public void write(java.lang.String s,
                  int off,
                  int len)
           throws java.io.IOException

Write a portion of a String

Overrides:

write in class java.io.Writer

Throws:

java.io.IOException

flush

public void flush()
           throws java.io.IOException

Specified by:

flush in interface java.io.Flushable

Specified by:

flush in class java.io.Writer

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Specified by:

close in class java.io.Writer

Throws:

java.io.IOException

dupFirstMarker

protected int dupFirstMarker()
                      throws java.io.IOException,
                             JpegException

copy the marker and return it

Throws:

java.io.IOException

JpegException

read2bytes

protected int read2bytes()
                  throws java.io.IOException,
                         JpegException

read 2 bytes and create an integer out of it

Throws:

java.io.IOException

JpegException

nextMarker

protected int nextMarker()
                  throws java.io.IOException

get the next marker, and eat extra bytes

Throws:

java.io.IOException

skipVariable

protected void skipVariable()
                     throws java.io.IOException,
                            JpegException

skip the body after a marker

Throws:

java.io.IOException

JpegException

dupHeader

protected void dupHeader(int marker)
                  throws java.io.IOException,
                         JpegException

dup the marker and the body

Throws:

java.io.IOException

JpegException

writeMarker

protected void writeMarker(int marker)
                    throws java.io.IOException

Throws:

java.io.IOException

writeMarkerLength

protected void writeMarkerLength(int len)
                          throws java.io.IOException

Throws:

java.io.IOException

dupFirstHeaders

protected void dupFirstHeaders()
                        throws java.io.IOException

the the first headers until a SOF parker is found

Throws:

java.io.IOException

main

public static void main(java.lang.String[] args)

The usual debugging tool