java.lang.Object
- net.sourceforge.jiu.codecs.jpeg.JPEGMarkerReader

```
public class JPEGMarkerReader
extends Object
```
Static helper methods to read various JPEG bitstream headers from a DataInput source into objects of the appropriate data classes. Objects are then added to a JPEGData object.

Since:

0.14.0

Author:

Marco Schmidt

Constructor Summary

Constructors
Modifier Constructor Description

private JPEGMarkerReader()
Private constructor to prevent instantiation.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static void`	`readHuffmanTables(DataInput in, JPEGData jpegData, int length)`
`static void`	`readQuantizationTables(DataInput in, JPEGData jpegData, int length)`	Read quantization tables from a DQT marker.
`static void`	`readStartOfFrame(DataInput in, JPEGData jpegData, int marker, int length)`
`static void`	`readStartOfScan(DataInput in, JPEGData jpegData, int length)`	Read an SOS (start of scan) marker.

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

Constructor Detail
- JPEGMarkerReader
```
private JPEGMarkerReader()
```
  Private constructor to prevent instantiation.

Method Detail

readHuffmanTables

public static void readHuffmanTables(DataInput in,
                                     JPEGData jpegData,
                                     int length)
                              throws InvalidFileStructureException,
                                     IOException

Throws:: InvalidFileStructureException; IOException

readQuantizationTables

public static void readQuantizationTables(DataInput in,
                                          JPEGData jpegData,
                                          int length)
                                   throws InvalidFileStructureException,
                                          IOException

Read quantization tables from a DQT marker. P&M 7.8.3, p. 118f.

Parameters:: jpegData - data object which will store the table(s); length - length of marker
Throws:: InvalidFileStructureException - if the DQT contains invalid data; IOException - on reading errors

readStartOfFrame

public static void readStartOfFrame(DataInput in,
                                    JPEGData jpegData,
                                    int marker,
                                    int length)
                             throws InvalidFileStructureException,
                                    IOException,
                                    UnsupportedTypeException

Throws:: InvalidFileStructureException; IOException; UnsupportedTypeException

readStartOfScan

public static void readStartOfScan(DataInput in,
                                   JPEGData jpegData,
                                   int length)
                            throws InvalidFileStructureException,
                                   IOException,
                                   UnsupportedTypeException

Read an SOS (start of scan) marker. P&M 7.6, p. 113.

Parameters:: in - source to read marker information from; jpegData - JPEGData object to update with information from the marker; length - size of marker in bytes
Throws:: InvalidFileStructureException - if encountered data does not follow the JPEG standard; IOException - on I/O errors; UnsupportedTypeException - if encountered data is valid but unsupported by this package

Class JPEGMarkerReader

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

JPEGMarkerReader

Method Detail

readHuffmanTables

readQuantizationTables

readStartOfFrame

readStartOfScan