loci.formats.in

Class APNGReader.PNGInputStream

java.lang.Object

java.io.InputStream

loci.formats.in.APNGReader.PNGInputStream

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

Enclosing class:

APNGReader

class APNGReader.PNGInputStream
extends java.io.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 and Description
private int	blockLength
private int	blockPointer
private java.lang.String	blockType
private int	currentBlock
private int	fctlCount
private boolean	fdatValid
private int	imageNumber

Constructor Summary

Constructors

Constructor and Description
PNGInputStream(java.lang.String blockType)
PNGInputStream(java.lang.String blockType, int imageNumber)

Method Summary

Modifier and Type	Method and 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, read, reset, skip

Methods inherited from class java.lang.Object

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

Field Detail

currentBlock

private int currentBlock

blockPointer

private int blockPointer

blockLength

private int blockLength

blockType

private java.lang.String blockType

imageNumber

private int imageNumber

fctlCount

private int fctlCount

fdatValid

private boolean fdatValid

Constructor Detail

PNGInputStream

public PNGInputStream(java.lang.String blockType)
               throws java.io.IOException

Throws:

java.io.IOException

PNGInputStream

public PNGInputStream(java.lang.String blockType,
                      int imageNumber)
               throws java.io.IOException

Throws:

java.io.IOException

Method Detail

available

public int available()
              throws java.io.IOException

Overrides:

available in class java.io.InputStream

Throws:

java.io.IOException

read

public int read()
         throws java.io.IOException

Specified by:

read in class java.io.InputStream

Throws:

java.io.IOException

readByte

public byte readByte()
              throws java.io.IOException

Throws:

java.io.IOException

read

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

Overrides:

read in class java.io.InputStream

Throws:

java.io.IOException

advanceBlock

private void advanceBlock()
                   throws java.io.IOException

Throws:

java.io.IOException