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package nom.tam.fits.compression.algorithm.hcompress;
/*
* #%L
* nom.tam FITS library
* %%
* Copyright (C) 1996 - 2024 nom-tam-fits
* %%
* This is free and unencumbered software released into the public domain.
*
* Anyone is free to copy, modify, publish, use, compile, sell, or
* distribute this software, either in source code form or as a compiled
* binary, for any purpose, commercial or non-commercial, and by any
* means.
*
* In jurisdictions that recognize copyright laws, the author or authors
* of this software dedicate any and all copyright interest in the
* software to the public domain. We make this dedication for the benefit
* of the public at large and to the detriment of our heirs and
* successors. We intend this dedication to be an overt act of
* relinquishment in perpetuity of all present and future rights to this
* software under copyright law.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
* #L%
*/
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.IntBuffer;
import java.nio.ShortBuffer;
import nom.tam.fits.compression.algorithm.api.ICompressor;
import nom.tam.fits.compression.algorithm.quant.QuantizeProcessor.DoubleQuantCompressor;
import nom.tam.fits.compression.algorithm.quant.QuantizeProcessor.FloatQuantCompressor;
import nom.tam.util.ArrayFuncs;
/**
* (for internal use) Data compressor using the HCompress algorithm.
*
* @param The generic type of buffer that accessed the type of elements needed for the compression
*/
@SuppressWarnings("javadoc")
public abstract class HCompressor implements ICompressor {
public static class ByteHCompressor extends HCompressor {
private static final long BYTE_MASK_FOR_LONG = 0xFFL;
/**
* HCompress of byte streams with the default scale parameter of 0 and no smoothing (lossless compression).
*
* @since 1.19.1
*
* @author Attila Kovacs
*/
public ByteHCompressor() {
this(new HCompressorOption());
}
public ByteHCompressor(HCompressorOption options) {
super(options);
}
@Override
public boolean compress(ByteBuffer buffer, ByteBuffer compressed) {
byte[] byteArray = new byte[buffer.limit()];
buffer.get(byteArray);
long[] longArray = new long[byteArray.length];
for (int index = 0; index < longArray.length; index++) {
longArray[index] = byteArray[index] & BYTE_MASK_FOR_LONG;
}
compress(longArray, compressed);
return true;
}
@Override
public void decompress(ByteBuffer compressed, ByteBuffer buffer) {
long[] longArray = new long[buffer.limit()];
decompress(compressed, longArray);
for (long element : longArray) {
buffer.put((byte) element);
}
}
}
public static class DoubleHCompressor extends DoubleQuantCompressor {
@SuppressWarnings("deprecation")
public DoubleHCompressor(HCompressorQuantizeOption options) {
super(options, new IntHCompressor((HCompressorOption) options.getCompressOption()));
}
}
public static class FloatHCompressor extends FloatQuantCompressor {
@SuppressWarnings("deprecation")
public FloatHCompressor(HCompressorQuantizeOption options) {
super(options, new IntHCompressor((HCompressorOption) options.getCompressOption()));
}
}
public static class IntHCompressor extends HCompressor {
/**
* HCompress of 32-bit integer streams with the default scale parameter of 0 and no smoothing for lossless
* compression.
*
* @since 1.19.1
*
* @author Attila Kovacs
*/
public IntHCompressor() {
this(new HCompressorOption());
}
public IntHCompressor(HCompressorOption options) {
super(options);
}
@Override
public boolean compress(IntBuffer buffer, ByteBuffer compressed) {
int[] intArray = new int[buffer.limit()];
buffer.get(intArray);
long[] longArray = new long[intArray.length];
ArrayFuncs.copyInto(intArray, longArray);
compress(longArray, compressed);
return true;
}
@Override
public void decompress(ByteBuffer compressed, IntBuffer buffer) {
long[] longArray = new long[buffer.limit()];
decompress(compressed, longArray);
for (long element : longArray) {
buffer.put((int) element);
}
}
}
public static class ShortHCompressor extends HCompressor {
/**
* HCompress of 16-bit integer streams with the default scale parameter of 0 (lossless compression).
*
* @since 1.19.1
*
* @author Attila Kovacs
*/
public ShortHCompressor() {
this(new HCompressorOption());
}
public ShortHCompressor(HCompressorOption options) {
super(options);
}
@Override
public boolean compress(ShortBuffer buffer, ByteBuffer compressed) {
short[] shortArray = new short[buffer.limit()];
buffer.get(shortArray);
long[] longArray = new long[shortArray.length];
ArrayFuncs.copyInto(shortArray, longArray);
compress(longArray, compressed);
return true;
}
@Override
public void decompress(ByteBuffer compressed, ShortBuffer buffer) {
long[] longArray = new long[buffer.limit()];
decompress(compressed, longArray);
for (long element : longArray) {
buffer.put((short) element);
}
}
}
private final HCompress compress;
private final HDecompress decompress;
private final HCompressorOption options;
public HCompressor(HCompressorOption options) {
this.options = options;
compress = new HCompress();
decompress = new HDecompress();
}
private HCompress compress() {
return compress;
}
protected void compress(long[] longArray, ByteBuffer compressed) {
compress().compress(longArray, options.getTileHeight(), options.getTileWidth(), options.getScale(), compressed);
}
private HDecompress decompress() {
return decompress;
}
protected void decompress(ByteBuffer compressed, long[] aa) {
decompress().decompress(compressed, options.isSmooth(), aa);
}
}
