Standard Widget Toolkit for GTK 3.125.0 · org.eclipse.swt.internal.image.PngDecodingDataStream

Modifier and Type	Field and Description
pack-priv int	adlerValue
pack-priv byte	currentByte
pack-priv PngLzBlockReader	lzBlockReader
pack-priv static final int	MAX_BIT
pack-priv int	nextBitIndex
pack-priv static final int	PRIME
pack-priv InputStream	stream

Access	Constructor and Description
pack-priv	PngDecodingDataStream(InputStream stream)

Method Summary

Modifier and Type	Method and Description
pack-priv void	assertImageDataAtEnd() This method should be called when the image decoder thinks that all of the compressed image data has been read.
pack-priv void	checkAdler()
public void	close() Overrides java.io.InputStream.close. Implements java.io.Closeable.close. Closes this input stream and releases any system resources associated with the stream.
pack-priv void	error()
pack-priv int	getNextIdatBit()
pack-priv int	getNextIdatBits(int length)
pack-priv byte	getNextIdatByte()
public int	read() Implements abstract java.io.InputStream.read. Reads the next byte of data from the input stream.
public int	read(byte[] the buffer into which the data is read. buffer, int the start offset in array `b` at which the data is written. off, int the maximum number of bytes to read. len) Overrides java.io.InputStream.read. Reads up to `len` bytes of data from the input stream into an array of bytes.
private void	readCompressedDataHeader()
pack-priv void	updateAdler(byte value)

Inherited from java.io.InputStream:: available mark markSupported nullInputStream read readAllBytes readNBytes readNBytes reset skip skipNBytes transferTo

adlerValue	back to summary
pack-priv int adlerValue

currentByte	back to summary
pack-priv byte currentByte

lzBlockReader	back to summary
pack-priv PngLzBlockReader lzBlockReader

MAX_BIT	back to summary
pack-priv static final int MAX_BIT

nextBitIndex	back to summary
pack-priv int nextBitIndex

PRIME	back to summary
pack-priv static final int PRIME

stream	back to summary
pack-priv InputStream stream

PngDecodingDataStream	back to summary
pack-priv PngDecodingDataStream(InputStream stream) throws IOException

Method Detail

assertImageDataAtEnd	back to summary
pack-priv void assertImageDataAtEnd() throws IOException This method should be called when the image decoder thinks that all of the compressed image data has been read. This method will ensure that the next data value is an end of block marker. If there are more blocks after this one, the method will read them and ensure that they are empty.

checkAdler	back to summary
pack-priv void checkAdler() throws IOException

close	back to summary
public void close() throws IOException Overrides java.io.InputStream.close. Implements java.io.Closeable.close. Doc from java.io.InputStream.close. Closes this input stream and releases any system resources associated with the stream. Annotations @Override Exceptions IOException: if an I/O error occurs.

back to summary

public void close() throws IOException

Overrides java.io.InputStream.close.

Implements java.io.Closeable.close.

Doc from java.io.InputStream.close.

Closes this input stream and releases any system resources associated with the stream.

Annotations

@Override

Exceptions

IOException:: if an I/O error occurs.

error	back to summary
pack-priv void error()

getNextIdatBit	back to summary
pack-priv int getNextIdatBit() throws IOException

getNextIdatBits	back to summary
pack-priv int getNextIdatBits(int length) throws IOException

getNextIdatByte	back to summary
pack-priv byte getNextIdatByte() throws IOException

read back to summary

read	back to summary
public int read() throws IOException Implements abstract java.io.InputStream.read. Doc from java.io.InputStream.read. Reads the next byte of data from the input stream. The value byte is returned as an `int` in the range `0` to `255`. If no byte is available because the end of the stream has been reached, the value `-1` is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown. Returns:int the next byte of data, or `-1` if the end of the stream is reached. Annotations @Override Exceptions IOException: if an I/O error occurs.

public int read() throws IOException

Implements abstract java.io.InputStream.read.

Doc from java.io.InputStream.read.

Reads the next byte of data from the input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

Returns:int

the next byte of data, or -1 if the end of the stream is reached.

Annotations

@Override

Exceptions

IOException:: if an I/O error occurs.

read back to summary

read	back to summary
public int read(byte[] buffer, int off, int len) throws IOException Overrides java.io.InputStream.read. Doc from java.io.InputStream.read. Reads up to `len` bytes of data from the input stream into an array of bytes. An attempt is made to read as many as `len` bytes, but a smaller number may be read. The number of bytes actually read is returned as an integer. This method blocks until input data is available, end of file is detected, or an exception is thrown. If `len` is zero, then no bytes are read and `0` is returned; otherwise, there is an attempt to read at least one byte. If no byte is available because the stream is at end of file, the value `-1` is returned; otherwise, at least one byte is read and stored into `b`. The first byte read is stored into element `b[off]`, the next one into `b[off+1]`, and so on. The number of bytes read is, at most, equal to `len`. Let k be the number of bytes actually read; these bytes will be stored in elements `b[off]` through `b[off+`k`-1]`, leaving elements `b[off+`k`]` through `b[off+len-1]` unaffected. In every case, elements `b[0]` through `b[off-1]` and elements `b[off+len]` through `b[b.length-1]` are unaffected. Parameters buffer:byte[] the buffer into which the data is read. off:int the start offset in array `b` at which the data is written. len:int the maximum number of bytes to read. Returns:int the total number of bytes read into the buffer, or `-1` if there is no more data because the end of the stream has been reached. Annotations @Override Exceptions IOException: If the first byte cannot be read for any reason other than end of file, or if the input stream has been closed, or if some other I/O error occurs.

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

Overrides java.io.InputStream.read.

Doc from java.io.InputStream.read.

Reads up to len bytes of data from the input stream into an array of bytes. An attempt is made to read as many as len bytes, but a smaller number may be read. The number of bytes actually read is returned as an integer.

This method blocks until input data is available, end of file is detected, or an exception is thrown.

If len is zero, then no bytes are read and 0 is returned; otherwise, there is an attempt to read at least one byte. If no byte is available because the stream is at end of file, the value -1 is returned; otherwise, at least one byte is read and stored into b.

The first byte read is stored into element b[off], the next one into b[off+1], and so on. The number of bytes read is, at most, equal to len. Let k be the number of bytes actually read; these bytes will be stored in elements b[off] through b[off+k-1], leaving elements b[off+k] through b[off+len-1] unaffected.

In every case, elements b[0] through b[off-1] and elements b[off+len] through b[b.length-1] are unaffected.

Parameters

buffer:byte[]: the buffer into which the data is read.
off:int: the start offset in array b at which the data is written.
len:int: the maximum number of bytes to read.

Returns:int

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

Annotations

@Override

Exceptions

IOException:: If the first byte cannot be read for any reason other than end of file, or if the input stream has been closed, or if some other I/O error occurs.

readCompressedDataHeader	back to summary
private void readCompressedDataHeader() throws IOException

updateAdler	back to summary
pack-priv void updateAdler(byte value)

public Class PngDecodingDataStream

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail