it.geosolutions.imageio.stream.input.compressed

Class GZIPImageInputStream

java.lang.Object

javax.imageio.stream.ImageInputStreamImpl

it.geosolutions.imageio.stream.input.FilterImageInputStream

it.geosolutions.imageio.stream.input.compressed.InflaterImageInputStream

it.geosolutions.imageio.stream.input.compressed.GZIPImageInputStream

All Implemented Interfaces:

Closeable, DataInput, AutoCloseable, ImageInputStream

Direct Known Subclasses:

GZIPFilterFileImageInputStreamExt

public class GZIPImageInputStream
extends InflaterImageInputStream

This class implements a stream filter for reading compressed data in the GZIP format.

Author:

Simone Giannecchini, GeoSolutions

Field Summary

Fields

Modifier and Type	Field and Description
protected CRC32	crc CRC-32 for uncompressed data.
protected boolean	eos Indicates end of input stream.
static int	GZIP_MAGIC GZIP header magic number.

Fields inherited from class it.geosolutions.imageio.stream.input.compressed.InflaterImageInputStream

buf, inf, len, singleByteBuf, usesDefaultInflater

Fields inherited from class it.geosolutions.imageio.stream.input.FilterImageInputStream

iis

Fields inherited from class javax.imageio.stream.ImageInputStreamImpl

bitOffset, byteOrder, flushedPos, streamPos

Constructor Summary

Constructors

Constructor and Description
GZIPImageInputStream(ImageInputStream iis) Creates a new input stream with the specified buffer size.

Method Summary

Modifier and Type	Method and Description
void	close() Closes this input stream and releases any system resources associated with the stream.
int	read(byte[] buf, int off, int len) Reads uncompressed data into an array of bytes.

Methods inherited from class it.geosolutions.imageio.stream.input.compressed.InflaterImageInputStream

fill, mark, read, reset, seek, skipBytes, skipBytes

Methods inherited from class it.geosolutions.imageio.stream.input.FilterImageInputStream

getByteOrder, isCached, isCachedFile, isCachedMemory, setBitOffset, setByteOrder

Methods inherited from class javax.imageio.stream.ImageInputStreamImpl

checkClosed, finalize, flush, flushBefore, getBitOffset, getFlushedPosition, getStreamPosition, length, read, readBit, readBits, readBoolean, readByte, readBytes, readChar, readDouble, readFloat, readFully, readFully, readFully, readFully, readFully, readFully, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedInt, readUnsignedShort, readUTF

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.imageio.stream.ImageInputStream

flush, flushBefore, getBitOffset, getFlushedPosition, getStreamPosition, length, read, readBit, readBits, readBoolean, readByte, readBytes, readChar, readDouble, readFloat, readFully, readFully, readFully, readFully, readFully, readFully, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedInt, readUnsignedShort, readUTF

Field Detail

GZIP_MAGIC

public static final int GZIP_MAGIC

GZIP header magic number.

See Also:

Constant Field Values

crc

protected CRC32 crc

CRC-32 for uncompressed data.

eos

protected boolean eos

Indicates end of input stream.

Constructor Detail

GZIPImageInputStream

public GZIPImageInputStream(ImageInputStream iis)
                     throws IOException

Creates a new input stream with the specified buffer size.

Parameters:

in - the input stream

size - the input buffer size

Throws:

IOException - if an I/O error has occurred

IllegalArgumentException - if size is <= 0

Method Detail

read

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

Reads uncompressed data into an array of bytes. Blocks until enough input is available for decompression.

Specified by:

read in interface ImageInputStream

Overrides:

read in class InflaterImageInputStream

Parameters:

buf - the buffer into which the data is read

off - the start offset of the data

len - the maximum number of bytes read

Returns:

the actual number of bytes read, or -1 if the end of the compressed input stream is reached

Throws:

IOException - if an I/O error has occurred or the compressed input data is corrupt

close

public void close()
           throws IOException

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

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in interface ImageInputStream

Overrides:

close in class InflaterImageInputStream

Throws:

IOException - if an I/O error has occurred