JFIFInputStream (The Adobe AEM Quickstart and Web Application.)

java.lang.Object
- java.io.InputStream
- - java.io.FilterInputStream
  - - ch.randelshofer.media.jpeg.JFIFInputStream

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable
```
public class JFIFInputStream
extends java.io.FilterInputStream
```
JFIFInputStream.
This InputStream uses two special marker values which do not exist in the JFIF stream:
- -1: marks junk data at the beginning of the file.
- 0: marks entropy encoded image data.
The junk data at the beginning of the file can be accessed by calling the read-methods immediately after opening the stream. Call nextSegment() immediately after opening the stream if you are not interested into this junk data.
Junk data at the end of the file is delivered as part of the EOI_MARKER segment. Finish reading after encountering the EOI_MARKER segment if you are not interested in this junk data.
Source:
JPEG File Interchange Format Version 1.02
http://www.jpeg.org/public/jfif.pdf

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class JFIFInputStream.Segment
Represents a segment within a JFIF File.

Nested Classes
Modifier and Type	Class and Description
`static class`	`JFIFInputStream.Segment` Represents a segment within a JFIF File.

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`APP1_MARKER` APP1_MARKER Reserved for application use
`static int`	`APP2_MARKER` APP2_MARKER Reserved for application use
`static int`	`EOI_MARKER` End of image
`static int`	`JPG0_MARKER` Reserved for JPEG extensions
`static int`	`JPG1_MARKER`
`static int`	`JPG2_MARKER`
`static int`	`JPG3_MARKER`
`static int`	`JPG4_MARKER`
`static int`	`JPG5_MARKER`
`static int`	`JPG6_MARKER`
`static int`	`JPG7_MARKER`
`static int`	`JPG8_MARKER`
`static int`	`JPG9_MARKER`
`static int`	`JPGA_MARKER`
`static int`	`JPGB_MARKER`
`static int`	`JPGC_MARKER`
`static int`	`JPGD_MARKER`
`static int`	`JUNK_MARKER` JUNK_MARKER Marker (for data which is not part of the JFIF stream.
`static int`	`SOI_MARKER` Start of image
`static int`	`SOS_MARKER` Start of scan
`static int`	`TEM_MARKER` Temporary private use in arithmetic coding

Constructor Summary

Constructors
Constructor and Description

JFIFInputStream(java.io.InputStream in)

Constructors
Constructor and Description
`JFIFInputStream(java.io.InputStream in)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`JFIFInputStream.Segment`	`getNextSegment()` Gets the next segment from the input stream.
`JFIFInputStream.Segment`	`getSegment()` Gets the current segment from the input stream.
`long`	`getStreamPosition()`
`void`	`mark(int readlimit)` Marks the current position in this input stream.
`boolean`	`markSupported()` Tests if this input stream supports the `mark` and `reset` methods.
`int`	`read()` Reads the next byte of data from this input stream.
`int`	`read(byte[] b, int off, int len)` Reads up to `len` b of data from this input stream into an array of b.
`void`	`reset()` Repositions this stream to the position at the time the `mark` method was last called on this input stream.
`long`	`skip(long n)` Skips over and discards `n` b of data from the input stream.

Methods inherited from class java.io.FilterInputStream
available, close, read

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - JUNK_MARKER
```
public static final int JUNK_MARKER
```
    JUNK_MARKER Marker (for data which is not part of the JFIF stream.
    
    See Also:
    
    Constant Field Values
  - SOI_MARKER
```
public static final int SOI_MARKER
```
    Start of image
    
    See Also:
    
    Constant Field Values
  - EOI_MARKER
```
public static final int EOI_MARKER
```
    End of image
    
    See Also:
    
    Constant Field Values
  - TEM_MARKER
```
public static final int TEM_MARKER
```
    Temporary private use in arithmetic coding
    
    See Also:
    
    Constant Field Values
  - SOS_MARKER
```
public static final int SOS_MARKER
```
    Start of scan
    
    See Also:
    
    Constant Field Values
  - APP1_MARKER
```
public static final int APP1_MARKER
```
    APP1_MARKER Reserved for application use
    
    See Also:
    
    Constant Field Values
  - APP2_MARKER
```
public static final int APP2_MARKER
```
    APP2_MARKER Reserved for application use
    
    See Also:
    
    Constant Field Values
  - JPG0_MARKER
```
public static final int JPG0_MARKER
```
    Reserved for JPEG extensions
    
    See Also:
    
    Constant Field Values
  - JPG1_MARKER
```
public static final int JPG1_MARKER
```
    See Also:
    
    Constant Field Values
  - JPG2_MARKER
```
public static final int JPG2_MARKER
```
    See Also:
    
    Constant Field Values
  - JPG3_MARKER
```
public static final int JPG3_MARKER
```
    See Also:
    
    Constant Field Values
  - JPG4_MARKER
```
public static final int JPG4_MARKER
```
    See Also:
    
    Constant Field Values
  - JPG5_MARKER
```
public static final int JPG5_MARKER
```
    See Also:
    
    Constant Field Values
  - JPG6_MARKER
```
public static final int JPG6_MARKER
```
    See Also:
    
    Constant Field Values
  - JPG7_MARKER
```
public static final int JPG7_MARKER
```
    See Also:
    
    Constant Field Values
  - JPG8_MARKER
```
public static final int JPG8_MARKER
```
    See Also:
    
    Constant Field Values
  - JPG9_MARKER
```
public static final int JPG9_MARKER
```
    See Also:
    
    Constant Field Values
  - JPGA_MARKER
```
public static final int JPGA_MARKER
```
    See Also:
    
    Constant Field Values
  - JPGB_MARKER
```
public static final int JPGB_MARKER
```
    See Also:
    
    Constant Field Values
  - JPGC_MARKER
```
public static final int JPGC_MARKER
```
    See Also:
    
    Constant Field Values
  - JPGD_MARKER
```
public static final int JPGD_MARKER
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - JFIFInputStream
```
public JFIFInputStream(java.io.InputStream in)
```
- Method Detail
  - getSegment
```
public JFIFInputStream.Segment getSegment()
                                   throws java.io.IOException
```
    Gets the current segment from the input stream.
    
    Returns:
    
    The current segment. Returns null, if we encountered the end of the stream.
    
    Throws:
    
    java.io.IOException
  - getNextSegment
```
public JFIFInputStream.Segment getNextSegment()
                                       throws java.io.IOException
```
    Gets the next segment from the input stream.
    
    Returns:
    
    The next segment. Returns null, if we encountered the end of the stream.
    
    Throws:
    
    java.io.IOException
  - getStreamPosition
```
public long getStreamPosition()
```
  - read
```
public int read()
         throws java.io.IOException
```
    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 method blocks until input data is available, the end of the stream is detected, or an exception is thrown.
    This method simply performs in.read() and returns the result.
    
    Overrides:
    
    read in class java.io.FilterInputStream
    
    Returns:
    
    the next byte of data, or -1 if the end of the stream is reached.
    
    Throws:
    
    java.io.IOException - if an I/O error occurs.
    
    See Also:
    
    FilterInputStream.in
  - read
```
public int read(byte[] b,
                int off,
                int len)
         throws java.io.IOException
```
    Reads up to len b of data from this input stream into an array of b. This method blocks until some input is available.
    This method simply performs in.read(b, off, len) and returns the result.
    
    Overrides:
    
    read in class java.io.FilterInputStream
    
    Parameters:
    
    b - the buffer into which the data is read.
    
    off - the start offset of the data.
    
    len - the maximum number of b read.
    
    Returns:
    
    the total number of b read into the buffer, or -1 if there is no more data because the end of the stream has been reached.
    
    Throws:
    
    java.io.IOException - if an I/O error occurs.
    
    See Also:
    
    FilterInputStream.in
  - skip
```
public long skip(long n)
          throws java.io.IOException
```
    Skips over and discards n b of data from the input stream. The skip method may, for a variety of reasons, end up skipping over some smaller number of b, possibly 0. The actual number of b skipped is returned.
    This method simply performs in.skip(n).
    
    Overrides:
    
    skip in class java.io.FilterInputStream
    
    Parameters:
    
    n - the number of b to be skipped.
    
    Returns:
    
    the actual number of b skipped.
    
    Throws:
    
    java.io.IOException - if an I/O error occurs.
  - mark
```
public void mark(int readlimit)
```
    Marks the current position in this input stream. A subsequent call to the reset method repositions this stream at the last marked position so that subsequent reads re-read the same b.
    The readlimit argument tells this input stream to allow that many b to be read before the mark position gets invalidated.
    This method simply performs in.mark(readlimit).
    
    Overrides:
    
    mark in class java.io.FilterInputStream
    
    Parameters:
    
    readlimit - the maximum limit of b that can be read before the mark position becomes invalid.
    
    See Also:
    
    FilterInputStream.in, FilterInputStream.reset()
  - reset
```
public void reset()
           throws java.io.IOException
```
    Repositions this stream to the position at the time the mark method was last called on this input stream.
    This method simply performs in.reset().
    Stream marks are intended to be used in situations where you need to read ahead a little to see what's in the stream. Often this is most easily done by invoking some general parser. If the stream is of the type handled by the parse, it just chugs along happily. If the stream is not of that type, the parser should toss an exception when it fails. If this happens within readlimit b, it allows the outer code to reset the stream and try another parser.
    
    Overrides:
    
    reset in class java.io.FilterInputStream
    
    Throws:
    
    java.io.IOException - if the stream has not been marked or if the mark has been invalidated.
    
    See Also:
    
    FilterInputStream.in, FilterInputStream.mark(int)
  - markSupported
```
public boolean markSupported()
```
    Tests if this input stream supports the mark and reset methods. This method simply performs in.markSupported().
    
    Overrides:
    
    markSupported in class java.io.FilterInputStream
    
    Returns:
    
    true if this stream type supports the mark and reset method; false otherwise.
    
    See Also:
    
    FilterInputStream.in, InputStream.mark(int), InputStream.reset()

Class JFIFInputStream

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.io.FilterInputStream

Methods inherited from class java.lang.Object

Field Detail

JUNK_MARKER

SOI_MARKER

EOI_MARKER

TEM_MARKER

SOS_MARKER

APP1_MARKER

APP2_MARKER

JPG0_MARKER

JPG1_MARKER

JPG2_MARKER

JPG3_MARKER

JPG4_MARKER

JPG5_MARKER

JPG6_MARKER

JPG7_MARKER

JPG8_MARKER

JPG9_MARKER

JPGA_MARKER

JPGB_MARKER

JPGC_MARKER

JPGD_MARKER

Constructor Detail

JFIFInputStream

Method Detail

getSegment

getNextSegment

getStreamPosition

read

read

skip

mark

reset

markSupported