ch.randelshofer.media.tiff
Class IFDEntry

java.lang.Object
  ch.randelshofer.media.tiff.IFDEntry

public class IFDEntry
extends java.lang.Object

Represents a directory entry in a TIFF Image File Directory (IFD).

Each 12-byte IFD entry has the following format:

• Bytes 0-1 The Tag that identifies the field.
• Bytes 2-3 The field Type.
• Bytes 4-7 The number of values, Count of the indicated Type.
• Bytes 8-11 The Value Offset, the file offset (in bytes) of the Value for the field. The Value is expected to begin on a word boundary; the corresponding Value Offset will thus be an even number. This file offset may point anywhere in the file, even after the image data.

Version:

2.1 2010-09-07 Stores ifdOffset.
2.0 2010-07-24 Reworked.
1.0 2009-12-26 Created.

Author:

Werner Randelshofer

Constructor Summary

IFDEntry(int tagNumber, int typeNumber, long count, long valueOffset, long entryOffset)

Method Summary

long	getCount()
java.lang.Object	getData()
long	getDataOffset() The offset to the data.
long	getEntryOffset()
long	getIFDOffset()
long	getLength()
int	getTagNumber()
int	getTypeNumber()
long	getValueOffset() The value offset may either contain the data or point to the data depending on the type and the count.
boolean	isDataInValueOffset()
void	loadData(TIFFInputStream in)
java.lang.Object	readData(TIFFInputStream in) Reads value data with ifdDataOffset=0
java.lang.Object	readData(TIFFInputStream in, long ifdDataOffset) Reads value data with the specified ifdDataOffset.
void	setIFDOffset(long newValue)
java.lang.String	toString() FIXME Output is used by EXIFView
java.lang.String	toString(java.lang.Enum tagName)

Methods inherited from class java.lang.Object

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

Constructor Detail

IFDEntry

public IFDEntry(int tagNumber,
                int typeNumber,
                long count,
                long valueOffset,
                long entryOffset)

Method Detail

getCount

public long getCount()

getTagNumber

public int getTagNumber()

getTypeNumber

public int getTypeNumber()

getValueOffset

public long getValueOffset()

The value offset may either contain the data or point to the data depending on the type and the count.

Returns:

The value offset.

getDataOffset

public long getDataOffset()

The offset to the data.

setIFDOffset

public void setIFDOffset(long newValue)

getEntryOffset

public long getEntryOffset()

getIFDOffset

public long getIFDOffset()

isDataInValueOffset

public boolean isDataInValueOffset()

getLength

public long getLength()

readData

public java.lang.Object readData(TIFFInputStream in)
                          throws java.io.IOException

Reads value data with ifdDataOffset=0

Throws:

java.io.IOException

readData

public java.lang.Object readData(TIFFInputStream in,
                                 long ifdDataOffset)
                          throws java.io.IOException

Reads value data with the specified ifdDataOffset.

Throws:

java.io.IOException

loadData

public void loadData(TIFFInputStream in)
              throws java.io.IOException

Throws:

java.io.IOException

getData

public java.lang.Object getData()

toString

public java.lang.String toString()

FIXME Output is used by EXIFView

Overrides:

toString in class java.lang.Object

toString

public java.lang.String toString(java.lang.Enum tagName)