PngChunk

java.lang.Object
- org.apache.commons.imaging.common.BinaryFileParser
- - org.apache.commons.imaging.formats.png.chunks.PngChunk

Direct Known Subclasses:

PngChunkGama, PngChunkIccp, PngChunkIdat, PngChunkIhdr, PngChunkPhys, PngChunkPlte, PngChunkScal, PngTextChunk
```
public class PngChunk
extends BinaryFileParser
```
A PNG image is composed of several chunks. This is the base class for the chunks, used by the parser.

Field Summary

Fields
Modifier and Type	Field	Description
`boolean`	`ancillary`
`private byte[]`	`bytes`
`int`	`chunkType`
`int`	`crc`
`boolean`	`isPrivate`
`int`	`length`
`private boolean[]`	`propertyBits`
`boolean`	`reserved`
`boolean`	`safeToCopy`

Constructor Summary

Constructors
Constructor Description

PngChunk(int length, int chunkType, int crc, byte[] bytes)
Constructor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`byte[]`	`getBytes()`	Return a copy of the chunk bytes.
`protected java.io.ByteArrayInputStream`	`getDataStream()`	Create and return a `ByteArrayInputStream` for the chunk bytes.
`boolean[]`	`getPropertyBits()`	Return a copy of the chunk property bits.

Methods inherited from class org.apache.commons.imaging.common.BinaryFileParser
debugNumber, debugNumber, getByteOrder, setByteOrder

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

- Field Detail
  - length
```
public final int length
```
  - chunkType
```
public final int chunkType
```
  - crc
```
public final int crc
```
  - bytes
```
private final byte[] bytes
```
  - propertyBits
```
private final boolean[] propertyBits
```
  - ancillary
```
public final boolean ancillary
```
  - isPrivate
```
public final boolean isPrivate
```
  - reserved
```
public final boolean reserved
```
  - safeToCopy
```
public final boolean safeToCopy
```
- Constructor Detail
  - PngChunk
```
public PngChunk(int length,
                int chunkType,
                int crc,
                byte[] bytes)
```
    Constructor.
    
    Parameters:
    
    length - chunk length
    
    chunkType - chunk type
    
    crc - CRC computed over the chunk type and chunk data (but not the length)
    
    bytes - chunk data bytes
- Method Detail
  - getBytes
```
public byte[] getBytes()
```
    Return a copy of the chunk bytes.
    
    Returns:
    
    the chunk bytes
  - getPropertyBits
```
public boolean[] getPropertyBits()
```
    Return a copy of the chunk property bits.
    
    Returns:
    
    the chunk property bits
  - getDataStream
```
protected java.io.ByteArrayInputStream getDataStream()
```
    Create and return a ByteArrayInputStream for the chunk bytes.
    The caller is responsible for closing the resource.
    
    Returns:
    
    a ByteArrayInputStream for the chunk bytes