com.jogamp.common.util

Class CustomCompress

java.lang.Object

com.jogamp.common.util.CustomCompress

public class CustomCompress
extends Object

All in memory inflater / deflator for small chunks using streams

Stream header of deflated data:

• 4 bytes magic 0xDEF1A7E0 (Big Endian)
• 4 bytes integer deflated-size (Big Endian)
• 4 bytes integer inflated-size (Big Endian)
• deflated bytes

Field Summary

Fields

Modifier and Type	Field and Description
static int	MAGIC Start of stream header for deflated data

Constructor Summary

Constructors

Constructor and Description
CustomCompress()

Method Summary

Methods

Modifier and Type	Method and Description
static int	deflateToStream(byte[] input, int inOff, int inLen, int level, OutputStream out)
static byte[]	inflateFromStream(InputStream in)
static byte[]	inflateFromStream(InputStream in, int inLen, int outLen, byte[] output, int outOff)

Methods inherited from class java.lang.Object

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

Field Detail

MAGIC

public static final int MAGIC

Start of stream header for deflated data

See Also:

Constant Field Values

Constructor Detail

CustomCompress

public CustomCompress()

Method Detail

inflateFromStream

public static byte[] inflateFromStream(InputStream in)
                                throws IOException,
                                       ArrayIndexOutOfBoundsException,
                                       IllegalArgumentException

Parameters:

in - InputStream at start of stream header, i.e. position MAGIC.

Returns:

the inflated bytes from the stream

Throws:

IOException - if an I/O or deflation exception occurs

IllegalArgumentException - if inLen ≤ 0 or outLen ≤ 0, as read from header

ArrayIndexOutOfBoundsException

inflateFromStream

public static byte[] inflateFromStream(InputStream in,
                       int inLen,
                       int outLen,
                       byte[] output,
                       int outOff)
                                throws IOException,
                                       ArrayIndexOutOfBoundsException,
                                       IllegalArgumentException

Parameters:

in - InputStream at start of deflated bytes, i.e. after the stream header.

inLen - number of deflated bytes in stream in

outLen - number of inflated output bytes at outOff

output - sink for deflated bytes

outOff - offset to output

Returns:

the inflated bytes from the stream, passing output for chaining

Throws:

IOException - if an I/O or deflation exception occurs

ArrayIndexOutOfBoundsException - if outOff and outLen exceeds output

IllegalArgumentException - if inLen ≤ 0 or outLen ≤ 0

deflateToStream

public static int deflateToStream(byte[] input,
                  int inOff,
                  int inLen,
                  int level,
                  OutputStream out)
                           throws IOException,
                                  ArrayIndexOutOfBoundsException,
                                  IllegalArgumentException

Parameters:

input - raw input bytes

inOff - offset to input

inLen - number of input bytes at inOff

level - compression level 0-9 or Deflater.DEFAULT_COMPRESSION

out - sink for deflated bytes

Returns:

number of deflated bytes written, not including the header.

Throws:

IOException - if an I/O or deflation exception occurs

ArrayIndexOutOfBoundsException - if inOff and inLen exceeds input

IllegalArgumentException - if inLen ≤ 0