Package loci.formats.in

Class APNGReader.PNGInputStream

java.lang.Object

java.io.InputStream

loci.formats.in.APNGReader.PNGInputStream

All Implemented Interfaces:

Closeable, AutoCloseable

Enclosing class:

APNGReader

class APNGReader.PNGInputStream
extends InputStream

InputStream implementation that stitches together IDAT blocks into a seamless zlib stream. This allows us to decompress the image data without reading the entire compressed stream into a byte array.

Field Summary

Fields

Modifier and Type	Field	Description
private int	blockLength
private int	blockPointer
private String	blockType
private int	currentBlock
private int	fctlCount
private boolean	fdatValid
private int	imageNumber

Constructor Summary

Constructors

Constructor	Description
PNGInputStream(String blockType)
PNGInputStream(String blockType, int imageNumber)

Method Summary

Modifier and Type	Method	Description
private void	advanceBlock()
int	available()
int	read()
int	read(byte[] b, int off, int len)
byte	readByte()

Methods inherited from class java.io.InputStream

close, mark, markSupported, nullInputStream, read, readAllBytes, readNBytes, readNBytes, reset, skip, skipNBytes, transferTo

Methods inherited from class java.lang.Object

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

Field Details

currentBlock

private int currentBlock

blockPointer

private int blockPointer

blockLength

private int blockLength

blockType

private String blockType

imageNumber

private int imageNumber

fctlCount

private int fctlCount

fdatValid

private boolean fdatValid

Constructor Details

PNGInputStream

public PNGInputStream(String blockType)
               throws IOException

Throws:

IOException

PNGInputStream

public PNGInputStream(String blockType,
 int imageNumber)
               throws IOException

Throws:

IOException

Method Details

available

public int available()
              throws IOException

Overrides:

available in class InputStream

Throws:

IOException

read

public int read()
         throws IOException

Specified by:

read in class InputStream

Throws:

IOException

readByte

public byte readByte()
              throws IOException

Throws:

IOException

read

public int read(byte[] b,
 int off,
 int len)
         throws IOException

Overrides:

read in class InputStream

Throws:

IOException

advanceBlock

private void advanceBlock()
                   throws IOException

Throws:

IOException