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package nom.tam.fits.compression.algorithm.gzip;
import java.io.IOException;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.DoubleBuffer;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import java.nio.LongBuffer;
import java.nio.ShortBuffer;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import nom.tam.fits.compression.algorithm.api.ICompressor;
import nom.tam.util.ArrayFuncs;
import nom.tam.util.ByteBufferInputStream;
import nom.tam.util.ByteBufferOutputStream;
import nom.tam.util.FitsIO;
import nom.tam.util.type.ElementType;
/*
* #%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%
*/
/**
* (for internal use) The GZIP compression algorithm.
*
* @param The genetic type of element buffer to compress
*/
@SuppressWarnings("javadoc")
public abstract class GZipCompressor implements ICompressor {
/**
* Byte compress is a special case, the only one that does not extends GZipCompress because it can write the buffer
* directly.
*/
public static class ByteGZipCompressor extends GZipCompressor {
public ByteGZipCompressor() {
super(1);
nioBuffer = ByteBuffer.wrap(buffer);
}
@Override
protected void getPixel(ByteBuffer pixelData, byte[] pixelBytes) {
nioBuffer.put(pixelData);
}
@Override
protected void setPixel(ByteBuffer pixelData, byte[] pixelBytes) {
pixelData.put(nioBuffer);
}
}
public static class DoubleGZipCompressor extends GZipCompressor {
protected static final int BYTE_SIZE_OF_DOUBLE = 8;
public DoubleGZipCompressor() {
super(BYTE_SIZE_OF_DOUBLE);
nioBuffer = ByteBuffer.wrap(buffer).asDoubleBuffer();
}
@Override
protected void getPixel(DoubleBuffer pixelData, byte[] pixelBytes) {
nioBuffer.put(pixelData);
}
@Override
protected void setPixel(DoubleBuffer pixelData, byte[] pixelBytes) {
pixelData.put(nioBuffer);
}
}
public static class FloatGZipCompressor extends GZipCompressor {
protected static final int BYTE_SIZE_OF_FLOAT = 4;
public FloatGZipCompressor() {
super(BYTE_SIZE_OF_FLOAT);
nioBuffer = ByteBuffer.wrap(buffer).asFloatBuffer();
}
@Override
protected void getPixel(FloatBuffer pixelData, byte[] pixelBytes) {
nioBuffer.put(pixelData);
}
@Override
protected void setPixel(FloatBuffer pixelData, byte[] pixelBytes) {
pixelData.put(nioBuffer);
}
}
public static class IntGZipCompressor extends GZipCompressor {
protected static final int BYTE_SIZE_OF_INT = 4;
public IntGZipCompressor() {
super(BYTE_SIZE_OF_INT);
nioBuffer = ByteBuffer.wrap(buffer).asIntBuffer();
}
@Override
protected void getPixel(IntBuffer pixelData, byte[] pixelBytes) {
nioBuffer.put(pixelData);
}
@Override
protected void setPixel(IntBuffer pixelData, byte[] pixelBytes) {
pixelData.put(nioBuffer);
}
}
public static class LongGZipCompressor extends GZipCompressor {
protected static final int BYTE_SIZE_OF_LONG = 8;
public LongGZipCompressor() {
super(BYTE_SIZE_OF_LONG);
nioBuffer = ByteBuffer.wrap(buffer).asLongBuffer();
}
@Override
protected void getPixel(LongBuffer pixelData, byte[] pixelBytes) {
nioBuffer.put(pixelData);
}
@Override
protected void setPixel(LongBuffer pixelData, byte[] pixelBytes) {
pixelData.put(nioBuffer);
}
}
public static class ShortGZipCompressor extends GZipCompressor {
protected static final int BYTE_SIZE_OF_SHORT = 2;
public ShortGZipCompressor() {
super(BYTE_SIZE_OF_SHORT);
nioBuffer = ByteBuffer.wrap(buffer).asShortBuffer();
}
@Override
protected void getPixel(ShortBuffer pixelData, byte[] pixelBytes) {
nioBuffer.put(pixelData);
}
@Override
protected void setPixel(ShortBuffer pixelData, byte[] pixelBytes) {
pixelData.put(nioBuffer);
}
}
private final class TypeConversion {
private final ElementType from;
private final ElementType to;
private final B fromBuffer;
private final T toBuffer;
private final Object fromArray;
private final Object toArray;
private TypeConversion(ElementType from) {
this.from = from;
to = getElementType(GZipCompressor.this.primitiveSize);
toBuffer = GZipCompressor.this.nioBuffer;
fromBuffer = from.asTypedBuffer(ByteBuffer.wrap(GZipCompressor.this.buffer));
fromArray = from.newArray(DEFAULT_GZIP_BUFFER_SIZE / from.size());
toArray = to.newArray(DEFAULT_GZIP_BUFFER_SIZE / to.size());
}
int copy(int byteCount) {
fromBuffer.rewind();
toBuffer.rewind();
from.getArray(fromBuffer, fromArray);
ArrayFuncs.copyInto(fromArray, toArray);
to.putArray(toBuffer, toArray);
return byteCount * to.size() / from.size();
}
}
private static final int DEFAULT_GZIP_BUFFER_SIZE = 65536;
private static final int MINIMAL_GZIP_BUFFER_SIZE = 65536;
protected final int primitiveSize;
protected byte[] buffer = new byte[DEFAULT_GZIP_BUFFER_SIZE];
protected T nioBuffer;
private final byte[] sizeArray = new byte[ElementType.INT.size()];
private final IntBuffer sizeBuffer = ByteBuffer.wrap(sizeArray).order(ByteOrder.LITTLE_ENDIAN).asIntBuffer();
public GZipCompressor(int primitiveSize) {
this.primitiveSize = primitiveSize;
}
@Override
public boolean compress(T pixelData, ByteBuffer compressed) {
nioBuffer.rewind();
int pixelDataLimit = pixelData.limit();
try (GZIPOutputStream zip = createGZipOutputStream(pixelDataLimit, compressed)) {
while (pixelData.hasRemaining()) {
int count = Math.min(pixelData.remaining(), nioBuffer.capacity());
pixelData.limit(pixelData.position() + count);
getPixel(pixelData, null);
zip.write(buffer, 0, nioBuffer.position() * primitiveSize);
nioBuffer.rewind();
pixelData.limit(pixelDataLimit);
}
} catch (IOException e) {
throw new IllegalStateException("could not gzip data", e);
}
compressed.limit(compressed.position());
return true;
}
@Override
public void decompress(ByteBuffer compressed, T pixelData) {
nioBuffer.rewind();
TypeConversion typeConverter = getTypeConverter(compressed, pixelData.limit());
try (GZIPInputStream zip = createGZipInputStream(compressed)) {
int count;
while ((count = zip.read(buffer)) >= 0) {
if (typeConverter != null) {
count = typeConverter.copy(count);
}
nioBuffer.position(0);
nioBuffer.limit(count / primitiveSize);
setPixel(pixelData, null);
}
} catch (IOException e) {
throw new IllegalStateException("could not gunzip data", e);
}
}
@SuppressWarnings("unchecked")
private ElementType getElementType(int size) {
return (ElementType) ElementType.forBitpix(size * FitsIO.BITS_OF_1_BYTE);
}
private TypeConversion getTypeConverter(ByteBuffer compressed, int nrOfPrimitiveElements) {
if (compressed.limit() > FitsIO.BYTES_IN_INTEGER) {
int oldPosition = compressed.position();
try {
compressed.position(compressed.limit() - sizeArray.length);
compressed.get(sizeArray);
int uncompressedSize = sizeBuffer.get(0);
if (uncompressedSize > 0) {
compressed.position(oldPosition);
if (uncompressedSize % nrOfPrimitiveElements == 0) {
int compressedPrimitiveSize = uncompressedSize / nrOfPrimitiveElements;
if (compressedPrimitiveSize != primitiveSize) {
return new TypeConversion<>(getElementType(compressedPrimitiveSize));
}
}
}
} finally {
compressed.position(oldPosition);
}
}
return null;
}
protected GZIPInputStream createGZipInputStream(ByteBuffer compressed) throws IOException {
return new GZIPInputStream(new ByteBufferInputStream(compressed),
Math.min(compressed.limit() * 2, DEFAULT_GZIP_BUFFER_SIZE));
}
protected GZIPOutputStream createGZipOutputStream(int length, ByteBuffer compressed) throws IOException {
return new GZIPOutputStream(new ByteBufferOutputStream(compressed),
Math.min(Math.max(length * 2, MINIMAL_GZIP_BUFFER_SIZE), DEFAULT_GZIP_BUFFER_SIZE));
}
protected abstract void getPixel(T pixelData, byte[] pixelBytes);
protected abstract void setPixel(T pixelData, byte[] pixelBytes);
}
