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java.lang.Object
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+--java.io.OutputStream
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+--net.rim.device.api.compress.ZLibOutputStream
Output stream for writing a data stream compressed with the ZLib algorithm (RFC 1950, RFC 1951).
| Field Summary | ||
static int |
COMPRESSION_BEST
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static int |
COMPRESSION_NONE
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static int |
MAX_LOG2_WINDOW_LENGTH
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static int |
MIN_LOG2_WINDOW_LENGTH
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| Constructor Summary | ||
ZLibOutputStream(OutputStream outputStream)
Creates a new ZLibOutputStream instance (the header and trailer wrapping will be generated, and the maximum window length may be used - see other constructors). |
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ZLibOutputStream(OutputStream outputStream,
boolean noWrap)
Creates a new ZLibOutputStream instance (the maximum window length may be used - see other constructors). |
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ZLibOutputStream(OutputStream outputStream,
boolean noWrap,
int maxLog2WindowLength)
Creates a new ZLibOutputStream instance. |
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ZLibOutputStream(OutputStream outputStream,
boolean noWrap,
int maxLog2WindowLength,
int compressionValue)
Creates a new ZLibOutputStream instance. |
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| Method Summary | ||
void |
close()
Closes this output stream. |
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void |
flush()
Flushes this stream, writing out any remaining buffered data. |
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void |
write(byte[] data,
int dataOffset,
int dataLength)
Writes some bytes from byte array to this stream. |
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void |
write(int data)
Writes a byte to this stream. |
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| Methods inherited from class java.io.OutputStream |
write |
| Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
| Constructor Detail |
public ZLibOutputStream(OutputStream outputStream)
Note this constructor provides no compression; this is done to be compatible with prior implementations of this class. Use the alternate constructor which accepts the compression value to achieve compression.
outputStream - Underlying output stream to use.public ZLibOutputStream(OutputStream outputStream, boolean noWrap)
If noWrap is true, the compressor will not generate
the ZLib 16 bit header and the 32 bit trailer checksum. This mode is necessary
for PKZip/Info-ZIP and GZIP compatibility.
Note this constructor provides no compression; this is done to be compatible with prior implementations of this class. Use the alternate constructor which accepts the compression value to achieve compression.
outputStream - Underlying output stream to use.noWrap - If true, the header and trailer will not be generated.public ZLibOutputStream(OutputStream outputStream, boolean noWrap, int maxLog2WindowLength)
If noWrap is true, the compressor will not generate
the ZLib 16 bit header and the 32 bit trailer checksum. This mode is necessary
for PKZip/Info-ZIP and GZIP compatibility.
maxLog2WindowLength can range from 8 to 15. Note: if the value was 10,
the window length would be 2^10 = 1024 bytes. This parameter can be used to limit
the window length for those decompressors which are not capable of dealing with
the maximum window length (2^15 -> 32KB). Note, the actual window length
may be smaller.
Note this constructor provides no compression; this is done to be compatible with prior implementations of this class. Use the alternate constructor which accepts the compression value to achieve compression.
outputStream - Underlying output stream to use.noWrap - If true, the header and trailer will not be generated.maxLog2WindowLength - maximum window length.public ZLibOutputStream(OutputStream outputStream, boolean noWrap, int maxLog2WindowLength, int compressionValue)
If noWrap is true, the compressor will not generate
the ZLib 16 bit header and the 32 bit trailer checksum. This mode is necessary
for PKZip/Info-ZIP and GZIP compatibility.
maxLog2WindowLength can range from 8 to 15. Note: if the value was 10,
the window length would be 2^10 = 1024 bytes. This parameter can be used to limit
the window length for those decompressors which are not capable of dealing with
the maximum window length (2^15 -> 32KB). Note, the actual window length
may be smaller.
outputStream - Underlying output stream to use.noWrap - If true, the header and trailer will not be generated.maxLog2WindowLength - maximum window length.compressionValue - 0 to 9 representing compression value; 0 being none; 9 being best.| Method Detail |
public void close()
throws IOException
close in class OutputStreamIOException - If an I/O error occurs.
public void flush()
throws IOException
flush in class OutputStreamIOException - If an I/O error occurs.
public void write(byte[] data,
int dataOffset,
int dataLength)
throws IOException
Invoke this method to compress, and then write, some bytes contained in the input array to this stream.
write in class OutputStreamdata - Data to write.dataOffset - First byte from provided array to compress and write.dataLength - Number of bytes from provided array to compress and write.IOException - If an I/O error occurs.
public void write(int data)
throws IOException
write in class OutputStreamdata - the byte to be written
IOException - If an I/O error occurs.
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Copyright 1999-2007 Research In Motion Limited. 295 Phillip Street, Waterloo, Ontario, Canada, N2L 3W8. All Rights Reserved.
Copyright 1993-2003 Sun Microsystems, Inc. 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
Copyright 2002-2003 Nokia Corporation All Rights Reserved.
Java is a trademark or registered trademark of Sun Microsystems, Inc. in the US and other countries.