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add support for JPEG Lossless

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JPEG Lossless files which are supported
https://github.com/rii-mango/JPEGLosslessDecoder can be read.

Careful: currently only supports
16, 8-bit grayscale and 24 bit rgb conversion for BufferedImages
This commit is contained in:
HermannKroll 2016-02-01 11:43:08 +01:00 committed by Harald Kuhr
parent 13bea23550
commit ad269053ed
10 changed files with 1672 additions and 1 deletions
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33
imageio/imageio-jpeg/src/main/java/com/twelvemonkeys/imageio/plugins/jpeg/JPEGImageReader.java
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@ -39,6 +39,8 @@ import com.twelvemonkeys.imageio.metadata.exif.TIFF;
import com.twelvemonkeys.imageio.metadata.jpeg.JPEG;
import com.twelvemonkeys.imageio.metadata.jpeg.JPEGSegment;
import com.twelvemonkeys.imageio.metadata.jpeg.JPEGSegmentUtil;
import com.twelvemonkeys.imageio.plugins.jpeg.lossless.DataStream;
import com.twelvemonkeys.imageio.plugins.jpeg.lossless.JPEGLosslessDecoderWrapper;
import com.twelvemonkeys.imageio.util.ImageTypeSpecifiers;
import com.twelvemonkeys.imageio.util.ProgressListenerBase;
import com.twelvemonkeys.lang.Validate;
@ -338,9 +340,38 @@ public class JPEGImageReader extends ImageReaderBase {
JPEGColorSpace sourceCSType = getSourceCSType(getJFIF(), adobeDCT, sof);
//try to read an JPEG Lossless image
if(sof.marker == JPEG.SOF3){
JPEGLosslessDecoderWrapper decoder = new JPEGLosslessDecoderWrapper();
ImageInputStream inputStream = (ImageInputStream) this.getInput();
/* try to read the input stream as once. If length is not supported
* the image is read blockwise
*/
byte[] rawByteData;
long byteLength = inputStream.length();
if(byteLength > 0 && byteLength < Integer.MAX_VALUE){
rawByteData = new byte[(int)byteLength];
inputStream.read(rawByteData);
} else {
ByteArrayOutputStream bytes = new ByteArrayOutputStream(1024 * 1024 /* Provide a size close to what is likely the case for better performance*/);
byte[] buffer = new byte[1024];
int count;
while ((count = inputStream.read(buffer)) > 0) {
bytes.write(buffer, 0, count);
}
rawByteData = bytes.toByteArray();
}
//try do read the image, IOException can be thrown
return decoder.readImage(rawByteData);
}
// We need to apply ICC profile unless the profile is sRGB/default gray (whatever that is)
// - or only filter out the bad ICC profiles in the JPEGSegmentImageInputStream.
if (delegate.canReadRaster() && (
else if (delegate.canReadRaster() && (
bogusAdobeDCT ||
sourceCSType == JPEGColorSpace.CMYK ||
sourceCSType == JPEGColorSpace.YCCK ||

38
imageio/imageio-jpeg/src/main/java/com/twelvemonkeys/imageio/plugins/jpeg/lossless/ComponentSpec.java Normal file
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@ -0,0 +1,38 @@
/*
* Copyright (C) 2015 Michael Martinez
* Changes: Added support for selection values 2-7, fixed minor bugs &
* warnings, split into multiple class files, and general clean up.
*
* 08-25-2015: Helmut Dersch agreed to a license change from LGPL to MIT.
*/
/*
* Copyright (C) Helmut Dersch
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* 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 OR COPYRIGHT HOLDERS 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.
*/
package com.twelvemonkeys.imageio.plugins.jpeg.lossless;
public class ComponentSpec {
protected int hSamp; // Horizontal sampling factor
protected int quantTableSel; // Quantization table destination selector
protected int vSamp; // Vertical
}

40
imageio/imageio-jpeg/src/main/java/com/twelvemonkeys/imageio/plugins/jpeg/lossless/DataStream.java Normal file
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@ -0,0 +1,40 @@
/*
* Copyright (C) 2015 Michael Martinez
* Changes: Added support for selection values 2-7, fixed minor bugs &
* warnings, split into multiple class files, and general clean up.
*
* 08-25-2015: Helmut Dersch agreed to a license change from LGPL to MIT.
*/
/*
* Copyright (C) Helmut Dersch
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* 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 OR COPYRIGHT HOLDERS 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.
*/
package com.twelvemonkeys.imageio.plugins.jpeg.lossless;
public interface DataStream {
int get16();
int get8();
}

128
imageio/imageio-jpeg/src/main/java/com/twelvemonkeys/imageio/plugins/jpeg/lossless/FrameHeader.java Normal file
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@ -0,0 +1,128 @@
/*
* Copyright (C) 2015 Michael Martinez
* Changes: Added support for selection values 2-7, fixed minor bugs &
* warnings, split into multiple class files, and general clean up.
*
* 08-25-2015: Helmut Dersch agreed to a license change from LGPL to MIT.
*/
/*
* Copyright (C) Helmut Dersch
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* 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 OR COPYRIGHT HOLDERS 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.
*/
package com.twelvemonkeys.imageio.plugins.jpeg.lossless;
import java.io.IOException;
public class FrameHeader {
private ComponentSpec components[]; // Components
private int dimX; // Number of samples per line
private int dimY; // Number of lines
private int numComp; // Number of component in the frame
private int precision; // Sample Precision (from the original image)
public ComponentSpec[] getComponents() {
return components.clone();
}
public int getDimX() {
return dimX;
}
public int getDimY() {
return dimY;
}
public int getNumComponents() {
return numComp;
}
public int getPrecision() {
return precision;
}
protected int read(final DataStream data) throws IOException {
int count = 0;
final int length = data.get16();
count += 2;
precision = data.get8();
count++;
dimY = data.get16();
count += 2;
dimX = data.get16();
count += 2;
numComp = data.get8();
count++;
//components = new ComponentSpec[numComp]; // some image exceed this range...
components = new ComponentSpec[256]; // setting to 256 -- not sure what it should be.
for (int i = 1; i <= numComp; i++) {
if (count > length) {
throw new IOException("ERROR: frame format error");
}
final int c = data.get8();
count++;
if (count >= length) {
throw new IOException("ERROR: frame format error [c>=Lf]");
}
final int temp = data.get8();
count++;
if (components[c] == null) {
components[c] = new ComponentSpec();
}
components[c].hSamp = temp >> 4;
components[c].vSamp = temp & 0x0F;
components[c].quantTableSel = data.get8();
count++;
}
if (count != length) {
throw new IOException("ERROR: frame format error [Lf!=count]");
}
return 1;
}
}

163
imageio/imageio-jpeg/src/main/java/com/twelvemonkeys/imageio/plugins/jpeg/lossless/HuffmanTable.java Normal file
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@ -0,0 +1,163 @@
/*
* Copyright (C) 2015 Michael Martinez
* Changes: Added support for selection values 2-7, fixed minor bugs &
* warnings, split into multiple class files, and general clean up.
*
* 08-25-2015: Helmut Dersch agreed to a license change from LGPL to MIT.
*/
/*
* Copyright (C) Helmut Dersch
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* 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 OR COPYRIGHT HOLDERS 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.
*/
package com.twelvemonkeys.imageio.plugins.jpeg.lossless;
import java.io.IOException;
public class HuffmanTable {
private final int l[][][] = new int[4][2][16];
private final int th[] = new int[4]; // 1: this table is presented
private final int v[][][][] = new int[4][2][16][200]; // tables
private final int[][] tc = new int[4][2]; // 1: this table is presented
public static final int MSB = 0x80000000;
public HuffmanTable() {
tc[0][0] = 0;
tc[1][0] = 0;
tc[2][0] = 0;
tc[3][0] = 0;
tc[0][1] = 0;
tc[1][1] = 0;
tc[2][1] = 0;
tc[3][1] = 0;
th[0] = 0;
th[1] = 0;
th[2] = 0;
th[3] = 0;
}
protected int read(final DataStream data, final int[][][] HuffTab) throws IOException {
int count = 0;
final int length = data.get16();
count += 2;
while (count < length) {
final int temp = data.get8();
count++;
final int t = temp & 0x0F;
if (t > 3) {
throw new IOException("ERROR: Huffman table ID > 3");
}
final int c = temp >> 4;
if (c > 2) {
throw new IOException("ERROR: Huffman table [Table class > 2 ]");
}
th[t] = 1;
tc[t][c] = 1;
for (int i = 0; i < 16; i++) {
l[t][c][i] = data.get8();
count++;
}
for (int i = 0; i < 16; i++) {
for (int j = 0; j < l[t][c][i]; j++) {
if (count > length) {
throw new IOException("ERROR: Huffman table format error [count>Lh]");
}
v[t][c][i][j] = data.get8();
count++;
}
}
}
if (count != length) {
throw new IOException("ERROR: Huffman table format error [count!=Lf]");
}
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 2; j++) {
if (tc[i][j] != 0) {
buildHuffTable(HuffTab[i][j], l[i][j], v[i][j]);
}
}
}
return 1;
}
// Build_HuffTab()
// Parameter: t table ID
// c table class ( 0 for DC, 1 for AC )
// L[i] # of codewords which length is i
// V[i][j] Huffman Value (length=i)
// Effect:
// build up HuffTab[t][c] using L and V.
private void buildHuffTable(final int tab[], final int L[], final int V[][]) throws IOException {
int currentTable, temp;
int k;
temp = 256;
k = 0;
for (int i = 0; i < 8; i++) { // i+1 is Code length
for (int j = 0; j < L[i]; j++) {
for (int n = 0; n < (temp >> (i + 1)); n++) {
tab[k] = V[i][j] | ((i + 1) << 8);
k++;
}
}
}
for (int i = 1; k < 256; i++, k++) {
tab[k] = i | MSB;
}
currentTable = 1;
k = 0;
for (int i = 8; i < 16; i++) { // i+1 is Code length
for (int j = 0; j < L[i]; j++) {
for (int n = 0; n < (temp >> (i - 7)); n++) {
tab[(currentTable * 256) + k] = V[i][j] | ((i + 1) << 8);
k++;
}
if (k >= 256) {
if (k > 256) {
throw new IOException("ERROR: Huffman table error(1)!");
}
k = 0;
currentTable++;
}
}
}
}
}

780
imageio/imageio-jpeg/src/main/java/com/twelvemonkeys/imageio/plugins/jpeg/lossless/JPEGLosslessDecoder.java Normal file
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@ -0,0 +1,780 @@
package com.twelvemonkeys.imageio.plugins.jpeg.lossless;
/*
* Copyright (C) 2015 Michael Martinez
* Changes: Added support for selection values 2-7, fixed minor bugs &
* warnings, split into multiple class files, and general clean up.
*
* 08-25-2015: Helmut Dersch agreed to a license change from LGPL to MIT.
*/
/*
* Copyright (C) Helmut Dersch
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* 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 OR COPYRIGHT HOLDERS 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.
*/
import java.io.IOException;
import java.nio.ByteBuffer;
public class JPEGLosslessDecoder implements DataStream {
private final ByteBuffer buffer;
private final FrameHeader frame;
private final HuffmanTable huffTable;
private final QuantizationTable quantTable;
private final ScanHeader scan;
private final int HuffTab[][][] = new int[4][2][MAX_HUFFMAN_SUBTREE * 256];
private final int IDCT_Source[] = new int[64];
private final int nBlock[] = new int[10]; // number of blocks in the i-th Comp in a scan
private final int[] acTab[] = new int[10][]; // ac HuffTab for the i-th Comp in a scan
private final int[] dcTab[] = new int[10][]; // dc HuffTab for the i-th Comp in a scan
private final int[] qTab[] = new int[10][]; // quantization table for the i-th Comp in a scan
private boolean restarting;
private int dataBufferIndex;
private int marker;
private int markerIndex;
private int numComp;
private int restartInterval;
private int selection;
private int xDim, yDim;
private int xLoc;
private int yLoc;
private int mask;
private int[] outputData;
private int[] outputRedData;
private int[] outputGreenData;
private int[] outputBlueData;
private static final int IDCT_P[] = { 0, 5, 40, 16, 45, 2, 7, 42, 21, 56, 8, 61, 18, 47, 1, 4, 41, 23, 58, 13, 32, 24, 37, 10, 63, 17, 44, 3, 6, 43, 20,
57, 15, 34, 29, 48, 53, 26, 39, 9, 60, 19, 46, 22, 59, 12, 33, 31, 50, 55, 25, 36, 11, 62, 14, 35, 28, 49, 52, 27, 38, 30, 51, 54 };
private static final int TABLE[] = { 0, 1, 5, 6, 14, 15, 27, 28, 2, 4, 7, 13, 16, 26, 29, 42, 3, 8, 12, 17, 25, 30, 41, 43, 9, 11, 18, 24, 31, 40, 44, 53,
10, 19, 23, 32, 39, 45, 52, 54, 20, 22, 33, 38, 46, 51, 55, 60, 21, 34, 37, 47, 50, 56, 59, 61, 35, 36, 48, 49, 57, 58, 62, 63 };
public static final int RESTART_MARKER_BEGIN = 0xFFD0;
public static final int RESTART_MARKER_END = 0xFFD7;
public static final int MAX_HUFFMAN_SUBTREE = 50;
public static final int MSB = 0x80000000;
public int getDimX(){
return xDim;
}
public int getDimY(){
return yDim;
}
public JPEGLosslessDecoder(final byte[] data) {
buffer = ByteBuffer.wrap(data);
frame = new FrameHeader();
scan = new ScanHeader();
quantTable = new QuantizationTable();
huffTable = new HuffmanTable();
}
public int[][] decode() throws IOException {
int current, scanNum = 0;
final int pred[] = new int[10];
int[][] outputRef = null;
xLoc = 0;
yLoc = 0;
current = get16();
if (current != 0xFFD8) { // SOI
throw new IOException("Not a JPEG file");
}
current = get16();
while (((current >> 4) != 0x0FFC) || (current == 0xFFC4)) { // SOF 0~15
switch (current) {
case 0xFFC4: // DHT
huffTable.read(this, HuffTab);
break;
case 0xFFCC: // DAC
throw new IOException("Program doesn't support arithmetic coding. (format throw new IOException)");
case 0xFFDB:
quantTable.read(this, TABLE);
break;
case 0xFFDD:
restartInterval = readNumber();
break;
case 0xFFE0:
case 0xFFE1:
case 0xFFE2:
case 0xFFE3:
case 0xFFE4:
case 0xFFE5:
case 0xFFE6:
case 0xFFE7:
case 0xFFE8:
case 0xFFE9:
case 0xFFEA:
case 0xFFEB:
case 0xFFEC:
case 0xFFED:
case 0xFFEE:
case 0xFFEF:
readApp();
break;
case 0xFFFE:
readComment();
break;
default:
if ((current >> 8) != 0xFF) {
throw new IOException("ERROR: format throw new IOException! (decode)");
}
}
current = get16();
}
if ((current < 0xFFC0) || (current > 0xFFC7)) {
throw new IOException("ERROR: could not handle arithmetic code!");
}
frame.read(this);
current = get16();
do {
while (current != 0x0FFDA) { //SOS
switch (current) {
case 0xFFC4: //DHT
huffTable.read(this, HuffTab);
break;
case 0xFFCC: //DAC
throw new IOException("Program doesn't support arithmetic coding. (format throw new IOException)");
case 0xFFDB:
quantTable.read(this, TABLE);
break;
case 0xFFDD:
restartInterval = readNumber();
break;
case 0xFFE0:
case 0xFFE1:
case 0xFFE2:
case 0xFFE3:
case 0xFFE4:
case 0xFFE5:
case 0xFFE6:
case 0xFFE7:
case 0xFFE8:
case 0xFFE9:
case 0xFFEA:
case 0xFFEB:
case 0xFFEC:
case 0xFFED:
case 0xFFEE:
case 0xFFEF:
readApp();
break;
case 0xFFFE:
readComment();
break;
default:
if ((current >> 8) != 0xFF) {
throw new IOException("ERROR: format throw new IOException! (Parser.decode)");
}
}
current = get16();
}
final int precision = frame.getPrecision();
if (precision == 8) {
mask = 0xFF;
} else {
mask = 0xFFFF;
}
final ComponentSpec[] components = frame.getComponents();
scan.read(this);
numComp = scan.getNumComponents();
selection = scan.getSelection();
final ScanComponent[] scanComps = scan.components;
final int[][] quantTables = quantTable.quantTables;
for (int i = 0; i < numComp; i++) {
final int compN = scanComps[i].getScanCompSel();
qTab[i] = quantTables[components[compN].quantTableSel];
nBlock[i] = components[compN].vSamp * components[compN].hSamp;
dcTab[i] = HuffTab[scanComps[i].getDcTabSel()][0];
acTab[i] = HuffTab[scanComps[i].getAcTabSel()][1];
}
xDim = frame.getDimX();
yDim = frame.getDimY();
outputRef = new int[numComp][];
if (numComp == 1) {
outputData = new int[xDim * yDim];
outputRef[0] = outputData;
} else {
outputRedData = new int[xDim * yDim]; // not a good use of memory, but I had trouble packing bytes into int. some values exceeded 255.
outputGreenData = new int[xDim * yDim];
outputBlueData = new int[xDim * yDim];
outputRef[0] = outputRedData;
outputRef[1] = outputGreenData;
outputRef[2] = outputBlueData;
}
scanNum++;
while (true) { // Decode one scan
final int temp[] = new int[1]; // to store remainder bits
final int index[] = new int[1];
temp[0] = 0;
index[0] = 0;
for (int i = 0; i < 10; i++) {
pred[i] = (1 << (precision - 1));
}
if (restartInterval == 0) {
current = decode(pred, temp, index);
while ((current == 0) && ((xLoc < xDim) && (yLoc < yDim))) {
output(pred);
current = decode(pred, temp, index);
}
break; //current=MARKER
}
for (int mcuNum = 0; mcuNum < restartInterval; mcuNum++) {
restarting = (mcuNum == 0);
current = decode(pred, temp, index);
output(pred);
if (current != 0) {
break;
}
}
if (current == 0) {
if (markerIndex != 0) {
current = (0xFF00 | marker);
markerIndex = 0;
} else {
current = get16();
}
}
if ((current >= RESTART_MARKER_BEGIN) && (current <= RESTART_MARKER_END)) {
//empty
} else {
break; //current=MARKER
}
}
if ((current == 0xFFDC) && (scanNum == 1)) { //DNL
readNumber();
current = get16();
}
} while ((current != 0xFFD9) && ((xLoc < xDim) && (yLoc < yDim)) && (scanNum == 0));
return outputRef;
}
@Override
public final int get16() {
final int value = (buffer.getShort(dataBufferIndex) & 0xFFFF);
dataBufferIndex += 2;
return value;
}
@Override
public final int get8() {
return buffer.get(dataBufferIndex++) & 0xFF;
}
private int decode(final int prev[], final int temp[], final int index[]) throws IOException {
if (numComp == 1) {
return decodeSingle(prev, temp, index);
} else if (numComp == 3) {
return decodeRGB(prev, temp, index);
} else {
return -1;
}
}
private int decodeSingle(final int prev[], final int temp[], final int index[]) throws IOException {
// At the beginning of the first line and
// at the beginning of each restart interval the prediction value of 2P – 1 is used, where P is the input precision.
if (restarting) {
restarting = false;
prev[0] = (1 << (frame.getPrecision() - 1));
} else {
switch (selection) {
case 2:
prev[0] = getPreviousY(outputData);
break;
case 3:
prev[0] = getPreviousXY(outputData);
break;
case 4:
prev[0] = (getPreviousX(outputData) + getPreviousY(outputData)) - getPreviousXY(outputData);
break;
case 5:
prev[0] = getPreviousX(outputData) + ((getPreviousY(outputData) - getPreviousXY(outputData)) >> 1);
break;
case 6:
prev[0] = getPreviousY(outputData) + ((getPreviousX(outputData) - getPreviousXY(outputData)) >> 1);
break;
case 7:
prev[0] = (int) (((long) getPreviousX(outputData) + getPreviousY(outputData)) / 2);
break;
default:
prev[0] = getPreviousX(outputData);
break;
}
}
for (int i = 0; i < nBlock[0]; i++) {
final int value = getHuffmanValue(dcTab[0], temp, index);
if (value >= 0xFF00) {
return value;
}
final int n = getn(prev, value, temp, index);
final int nRestart = (n >> 8);
if ((nRestart >= RESTART_MARKER_BEGIN) && (nRestart <= RESTART_MARKER_END)) {
return nRestart;
}
prev[0] += n;
}
return 0;
}
private int decodeRGB(final int prev[], final int temp[], final int index[]) throws IOException {
switch (selection) {
case 2:
prev[0] = getPreviousY(outputRedData);
prev[1] = getPreviousY(outputGreenData);
prev[2] = getPreviousY(outputBlueData);
break;
case 3:
prev[0] = getPreviousXY(outputRedData);
prev[1] = getPreviousXY(outputGreenData);
prev[2] = getPreviousXY(outputBlueData);
break;
case 4:
prev[0] = (getPreviousX(outputRedData) + getPreviousY(outputRedData)) - getPreviousXY(outputRedData);
prev[1] = (getPreviousX(outputGreenData) + getPreviousY(outputGreenData)) - getPreviousXY(outputGreenData);
prev[2] = (getPreviousX(outputBlueData) + getPreviousY(outputBlueData)) - getPreviousXY(outputBlueData);
break;
case 5:
prev[0] = getPreviousX(outputRedData) + ((getPreviousY(outputRedData) - getPreviousXY(outputRedData)) >> 1);
prev[1] = getPreviousX(outputGreenData) + ((getPreviousY(outputGreenData) - getPreviousXY(outputGreenData)) >> 1);
prev[2] = getPreviousX(outputBlueData) + ((getPreviousY(outputBlueData) - getPreviousXY(outputBlueData)) >> 1);
break;
case 6:
prev[0] = getPreviousY(outputRedData) + ((getPreviousX(outputRedData) - getPreviousXY(outputRedData)) >> 1);
prev[1] = getPreviousY(outputGreenData) + ((getPreviousX(outputGreenData) - getPreviousXY(outputGreenData)) >> 1);
prev[2] = getPreviousY(outputBlueData) + ((getPreviousX(outputBlueData) - getPreviousXY(outputBlueData)) >> 1);
break;
case 7:
prev[0] = (int) (((long) getPreviousX(outputRedData) + getPreviousY(outputRedData)) / 2);
prev[1] = (int) (((long) getPreviousX(outputGreenData) + getPreviousY(outputGreenData)) / 2);
prev[2] = (int) (((long) getPreviousX(outputBlueData) + getPreviousY(outputBlueData)) / 2);
break;
default:
prev[0] = getPreviousX(outputRedData);
prev[1] = getPreviousX(outputGreenData);
prev[2] = getPreviousX(outputBlueData);
break;
}
int value, actab[], dctab[];
int qtab[];
for (int ctrC = 0; ctrC < numComp; ctrC++) {
qtab = qTab[ctrC];
actab = acTab[ctrC];
dctab = dcTab[ctrC];
for (int i = 0; i < nBlock[ctrC]; i++) {
for (int k = 0; k < IDCT_Source.length; k++) {
IDCT_Source[k] = 0;
}
value = getHuffmanValue(dctab, temp, index);
if (value >= 0xFF00) {
return value;
}
prev[ctrC] = IDCT_Source[0] = prev[ctrC] + getn(index, value, temp, index);
IDCT_Source[0] *= qtab[0];
for (int j = 1; j < 64; j++) {
value = getHuffmanValue(actab, temp, index);
if (value >= 0xFF00) {
return value;
}
j += (value >> 4);
if ((value & 0x0F) == 0) {
if ((value >> 4) == 0) {
break;
}
} else {
IDCT_Source[IDCT_P[j]] = getn(index, value & 0x0F, temp, index) * qtab[j];
}
}
}
}
return 0;
}
// Huffman table for fast search: (HuffTab) 8-bit Look up table 2-layer search architecture, 1st-layer represent 256 node (8 bits) if codeword-length > 8
// bits, then the entry of 1st-layer = (# of 2nd-layer table) | MSB and it is stored in the 2nd-layer Size of tables in each layer are 256.
// HuffTab[*][*][0-256] is always the only 1st-layer table.
//
// An entry can be: (1) (# of 2nd-layer table) | MSB , for code length > 8 in 1st-layer (2) (Code length) << 8 | HuffVal
//
// HuffmanValue(table HuffTab[x][y] (ex) HuffmanValue(HuffTab[1][0],...)
// ):
// return: Huffman Value of table
// 0xFF?? if it receives a MARKER
// Parameter: table HuffTab[x][y] (ex) HuffmanValue(HuffTab[1][0],...)
// temp temp storage for remainded bits
// index index to bit of temp
// in FILE pointer
// Effect:
// temp store new remainded bits
// index change to new index
// in change to new position
// NOTE:
// Initial by temp=0; index=0;
// NOTE: (explain temp and index)
// temp: is always in the form at calling time or returning time
// | byte 4 | byte 3 | byte 2 | byte 1 |
// | 0 | 0 | 00000000 | 00000??? | if not a MARKER
// ^index=3 (from 0 to 15)
// 321
// NOTE (marker and marker_index):
// If get a MARKER from 'in', marker=the low-byte of the MARKER
// and marker_index=9
// If marker_index=9 then index is always > 8, or HuffmanValue()
// will not be called
private int getHuffmanValue(final int table[], final int temp[], final int index[]) throws IOException {
int code, input;
final int mask = 0xFFFF;
if (index[0] < 8) {
temp[0] <<= 8;
input = get8();
if (input == 0xFF) {
marker = get8();
if (marker != 0) {
markerIndex = 9;
}
}
temp[0] |= input;
} else {
index[0] -= 8;
}
code = table[temp[0] >> index[0]];
if ((code & MSB) != 0) {
if (markerIndex != 0) {
markerIndex = 0;
return 0xFF00 | marker;
}
temp[0] &= (mask >> (16 - index[0]));
temp[0] <<= 8;
input = get8();
if (input == 0xFF) {
marker = get8();
if (marker != 0) {
markerIndex = 9;
}
}
temp[0] |= input;
code = table[((code & 0xFF) * 256) + (temp[0] >> index[0])];
index[0] += 8;
}
index[0] += 8 - (code >> 8);
if (index[0] < 0) {
throw new IOException("index=" + index[0] + " temp=" + temp[0] + " code=" + code + " in HuffmanValue()");
}
if (index[0] < markerIndex) {
markerIndex = 0;
return 0xFF00 | marker;
}
temp[0] &= (mask >> (16 - index[0]));
return code & 0xFF;
}
private int getn(final int[] PRED, final int n, final int temp[], final int index[]) throws IOException {
int result;
final int one = 1;
final int n_one = -1;
final int mask = 0xFFFF;
int input;
if (n == 0) {
return 0;
}
if (n == 16) {
if (PRED[0] >= 0) {
return -32768;
} else {
return 32768;
}
}
index[0] -= n;
if (index[0] >= 0) {
if ((index[0] < markerIndex) && !isLastPixel()) { // this was corrupting the last pixel in some cases
markerIndex = 0;
return (0xFF00 | marker) << 8;
}
result = temp[0] >> index[0];
temp[0] &= (mask >> (16 - index[0]));
} else {
temp[0] <<= 8;
input = get8();
if (input == 0xFF) {
marker = get8();
if (marker != 0) {
markerIndex = 9;
}
}
temp[0] |= input;
index[0] += 8;
if (index[0] < 0) {
if (markerIndex != 0) {
markerIndex = 0;
return (0xFF00 | marker) << 8;
}
temp[0] <<= 8;
input = get8();
if (input == 0xFF) {
marker = get8();
if (marker != 0) {
markerIndex = 9;
}
}
temp[0] |= input;
index[0] += 8;
}
if (index[0] < 0) {
throw new IOException("index=" + index[0] + " in getn()");
}
if (index[0] < markerIndex) {
markerIndex = 0;
return (0xFF00 | marker) << 8;
}
result = temp[0] >> index[0];
temp[0] &= (mask >> (16 - index[0]));
}
if (result < (one << (n - 1))) {
result += (n_one << n) + 1;
}
return result;
}
private int getPreviousX(final int data[]) {
if (xLoc > 0) {
return data[((yLoc * xDim) + xLoc) - 1];
} else if (yLoc > 0) {
return getPreviousY(data);
} else {
return (1 << (frame.getPrecision() - 1));
}
}
private int getPreviousXY(final int data[]) {
if ((xLoc > 0) && (yLoc > 0)) {
return data[(((yLoc - 1) * xDim) + xLoc) - 1];
} else {
return getPreviousY(data);
}
}
private int getPreviousY(final int data[]) {
if (yLoc > 0) {
return data[((yLoc - 1) * xDim) + xLoc];
} else {
return getPreviousX(data);
}
}
private boolean isLastPixel() {
return (xLoc == (xDim - 1)) && (yLoc == (yDim - 1));
}
private void output(final int PRED[]) {
if (numComp == 1) {
outputSingle(PRED);
} else {
outputRGB(PRED);
}
}
private void outputSingle(final int PRED[]) {
if ((xLoc < xDim) && (yLoc < yDim)) {
outputData[(yLoc * xDim) + xLoc] = mask & PRED[0];
xLoc++;
if (xLoc >= xDim) {
yLoc++;
xLoc = 0;
}
}
}
private void outputRGB(final int PRED[]) {
if ((xLoc < xDim) && (yLoc < yDim)) {
outputRedData[(yLoc * xDim) + xLoc] = PRED[0];
outputGreenData[(yLoc * xDim) + xLoc] = PRED[1];
outputBlueData[(yLoc * xDim) + xLoc] = PRED[2];
xLoc++;
if (xLoc >= xDim) {
yLoc++;
xLoc = 0;
}
}
}
private int readApp() throws IOException {
int count = 0;
final int length = get16();
count += 2;
while (count < length) {
get8();
count++;
}
return length;
}
private String readComment() throws IOException {
final StringBuffer sb = new StringBuffer();
int count = 0;
final int length = get16();
count += 2;
while (count < length) {
sb.append((char) get8());
count++;
}
return sb.toString();
}
private int readNumber() throws IOException {
final int Ld = get16();
if (Ld != 4) {
throw new IOException("ERROR: Define number format throw new IOException [Ld!=4]");
}
return get16();
}
public int getNumComponents() {
return numComp;
}
public int getPrecision() {
return frame.getPrecision();
}
}

130
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package com.twelvemonkeys.imageio.plugins.jpeg.lossless;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;
import java.awt.image.DataBufferInt;
import java.awt.image.DataBufferUShort;
import java.io.IOException;
/**
* This class provides the conversion of a byte buffer
* containing a JPEGLossless to an BufferedImage.
* Therefore it uses the rii-mango JPEGLosslessDecoder
* Library ( https://github.com/rii-mango/JPEGLosslessDecoder )
*
* Take care, that only the following lossless formats are supported
* 1.2.840.10008.1.2.4.57 JPEG Lossless, Nonhierarchical (Processes 14)
* 1.2.840.10008.1.2.4.70 JPEG Lossless, Nonhierarchical (Processes 14 [Selection 1])
*
* Currently the following conversions are supported
* - 24Bit, RGB -> BufferedImage.TYPE_INT_RGB
* - 8Bit, Grayscale -> BufferedImage.TYPE_BYTE_GRAY
* - 16Bit, Grayscale -> BufferedImage.TYPE_USHORT_GRAY
*
* @author Hermann Kroll
*
*/
public class JPEGLosslessDecoderWrapper {
/**
* Converts a byte buffer (containing a jpeg lossless)
* to an Java BufferedImage
* Currently the following conversions are supported
* - 24Bit, RGB -> BufferedImage.TYPE_INT_RGB
* - 8Bit, Grayscale -> BufferedImage.TYPE_BYTE_GRAY
* - 16Bit, Grayscale -> BufferedImage.TYPE_USHORT_GRAY
*
* @param data byte buffer which contains a jpeg lossless
* @return if successfully a BufferedImage is returned
* @throws IOException is thrown if the decoder failed or a conversion is not supported
*/
public BufferedImage readImage(byte[] data) throws IOException{
JPEGLosslessDecoder decoder = new JPEGLosslessDecoder(data);
int[][] decoded = decoder.decode();
int width = decoder.getDimX();
int height = decoder.getDimY();
if(decoder.getNumComponents() == 1){
switch(decoder.getPrecision())
{
case 8:
return read8Bit1ComponentGrayScale(decoded, width, height);
case 16:
return read16Bit1ComponentGrayScale(decoded, width, height);
default:
throw new IOException("JPEG Lossless with " + decoder.getPrecision() + " bit precision and 1 component cannot be decoded");
}
}
//rgb
if(decoder.getNumComponents() == 3){
switch(decoder.getPrecision())
{
case 24:
return read24Bit3ComponentRGB(decoded, width, height);
default:
throw new IOException("JPEG Lossless with " + decoder.getPrecision() + " bit precision and 3 components cannot be decoded");
}
}
throw new IOException("JPEG Lossless with " + decoder.getPrecision() + " bit precision and " + decoder.getNumComponents() + " component(s) cannot be decoded");
}
/**
* converts the decoded buffer into a BufferedImage
* precision: 16 bit, componentCount = 1
* @param decoded data buffer
* @param width of the image
* @param height of the image
* @return a BufferedImage.TYPE_USHORT_GRAY
*/
private BufferedImage read16Bit1ComponentGrayScale(int[][] decoded, int width, int height){
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_USHORT_GRAY);
short[] imageBuffer = ((DataBufferUShort) image.getRaster().getDataBuffer()).getData();
for(int i = 0; i < imageBuffer.length; i++){
imageBuffer[i] = (short)decoded[0][i];
}
return image;
}
/**
* converts the decoded buffer into a BufferedImage
* precision: 8 bit, componentCount = 1
* @param decoded data buffer
* @param width of the image
* @param height of the image
* @return a BufferedImage.TYPE_BYTE_GRAY
*/
private BufferedImage read8Bit1ComponentGrayScale(int[][] decoded, int width, int height){
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_GRAY);
byte[] imageBuffer = ((DataBufferByte) image.getRaster().getDataBuffer()).getData();
for(int i = 0; i < imageBuffer.length; i++){
imageBuffer[i] = (byte)decoded[0][i];
}
return image;
}
/**
* converts the decoded buffer into a BufferedImage
* precision: 24 bit, componentCount = 3
* @param decoded data buffer
* @param width of the image
* @param height of the image
* @return a BufferedImage.TYPE_INT_RGB
*/
private BufferedImage read24Bit3ComponentRGB(int[][] decoded, int width, int height){
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
int[] imageBuffer = ((DataBufferInt) image.getRaster().getDataBuffer()).getData();
for(int i = 0; i < imageBuffer.length; i++){
//convert to RGB
imageBuffer[i] = (decoded[0][i] << 16) | (decoded[1][i] << 8) | (decoded[2][i]);
}
return image;
}
}

141
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/*
* Copyright (C) 2015 Michael Martinez
* Changes: Added support for selection values 2-7, fixed minor bugs &
* warnings, split into multiple class files, and general clean up.
*
* 08-25-2015: Helmut Dersch agreed to a license change from LGPL to MIT.
*/
/*
* Copyright (C) Helmut Dersch
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* 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 OR COPYRIGHT HOLDERS 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.
*/
package com.twelvemonkeys.imageio.plugins.jpeg.lossless;
import java.io.IOException;
public class QuantizationTable {
private final int precision[] = new int[4]; // Quantization precision 8 or 16
private final int[] tq = new int[4]; // 1: this table is presented
protected final int quantTables[][] = new int[4][64]; // Tables
public QuantizationTable() {
tq[0] = 0;
tq[1] = 0;
tq[2] = 0;
tq[3] = 0;
}
protected int read(final DataStream data, final int[] table) throws IOException {
int count = 0;
final int length = data.get16();
count += 2;
while (count < length) {
final int temp = data.get8();
count++;
final int t = temp & 0x0F;
if (t > 3) {
throw new IOException("ERROR: Quantization table ID > 3");
}
precision[t] = temp >> 4;
if (precision[t] == 0) {
precision[t] = 8;
} else if (precision[t] == 1) {
precision[t] = 16;
} else {
throw new IOException("ERROR: Quantization table precision error");
}
tq[t] = 1;
if (precision[t] == 8) {
for (int i = 0; i < 64; i++) {
if (count > length) {
throw new IOException("ERROR: Quantization table format error");
}
quantTables[t][i] = data.get8();
count++;
}
enhanceQuantizationTable(quantTables[t], table);
} else {
for (int i = 0; i < 64; i++) {
if (count > length) {
throw new IOException("ERROR: Quantization table format error");
}
quantTables[t][i] = data.get16();
count += 2;
}
enhanceQuantizationTable(quantTables[t], table);
}
}
if (count != length) {
throw new IOException("ERROR: Quantization table error [count!=Lq]");
}
return 1;
}
private void enhanceQuantizationTable(final int qtab[], final int[] table) {
for (int i = 0; i < 8; i++) {
qtab[table[(0 * 8) + i]] *= 90;
qtab[table[(4 * 8) + i]] *= 90;
qtab[table[(2 * 8) + i]] *= 118;
qtab[table[(6 * 8) + i]] *= 49;
qtab[table[(5 * 8) + i]] *= 71;
qtab[table[(1 * 8) + i]] *= 126;
qtab[table[(7 * 8) + i]] *= 25;
qtab[table[(3 * 8) + i]] *= 106;
}
for (int i = 0; i < 8; i++) {
qtab[table[0 + (8 * i)]] *= 90;
qtab[table[4 + (8 * i)]] *= 90;
qtab[table[2 + (8 * i)]] *= 118;
qtab[table[6 + (8 * i)]] *= 49;
qtab[table[5 + (8 * i)]] *= 71;
qtab[table[1 + (8 * i)]] *= 126;
qtab[table[7 + (8 * i)]] *= 25;
qtab[table[3 + (8 * i)]] *= 106;
}
for (int i = 0; i < 64; i++) {
qtab[i] >>= 6;
}
}
}

74
imageio/imageio-jpeg/src/main/java/com/twelvemonkeys/imageio/plugins/jpeg/lossless/ScanComponent.java Normal file
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/*
* Copyright (C) 2015 Michael Martinez
* Changes: Added support for selection values 2-7, fixed minor bugs &
* warnings, split into multiple class files, and general clean up.
*
* 08-25-2015: Helmut Dersch agreed to a license change from LGPL to MIT.
*/
/*
* Copyright (C) Helmut Dersch
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* 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 OR COPYRIGHT HOLDERS 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.
*/
package com.twelvemonkeys.imageio.plugins.jpeg.lossless;
public class ScanComponent {
private int acTabSel; // AC table selector
private int dcTabSel; // DC table selector
private int scanCompSel; // Scan component selector
public int getAcTabSel() {
return acTabSel;
}
public int getDcTabSel() {
return dcTabSel;
}
public int getScanCompSel() {
return scanCompSel;
}
public void setAcTabSel(final int acTabSel) {
this.acTabSel = acTabSel;
}
public void setDcTabSel(final int dcTabSel) {
this.dcTabSel = dcTabSel;
}
public void setScanCompSel(final int scanCompSel) {
this.scanCompSel = scanCompSel;
}
}

146
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/*
* Copyright (C) 2015 Michael Martinez
* Changes: Added support for selection values 2-7, fixed minor bugs &
* warnings, split into multiple class files, and general clean up.
*
* 08-25-2015: Helmut Dersch agreed to a license change from LGPL to MIT.
*/
/*
* Copyright (C) Helmut Dersch
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* 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 OR COPYRIGHT HOLDERS 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.
*/
package com.twelvemonkeys.imageio.plugins.jpeg.lossless;
import java.io.IOException;
public class ScanHeader {
private int ah;
private int al;
private int numComp; // Number of components in the scan
private int selection; // Start of spectral or predictor selection
private int spectralEnd; // End of spectral selection
protected ScanComponent components[];
public int getAh() {
return ah;
}
public int getAl() {
return al;
}
public int getNumComponents() {
return numComp;
}
public int getSelection() {
return selection;
}
public int getSpectralEnd() {
return spectralEnd;
}
public void setAh(final int ah) {
this.ah = ah;
}
public void setAl(final int al) {
this.al = al;
}
public void setSelection(final int selection) {
this.selection = selection;
}
public void setSpectralEnd(final int spectralEnd) {
this.spectralEnd = spectralEnd;
}
protected int read(final DataStream data) throws IOException {
int count = 0;
final int length = data.get16();
count += 2;
numComp = data.get8();
count++;
components = new ScanComponent[numComp];
for (int i = 0; i < numComp; i++) {
components[i] = new ScanComponent();
if (count > length) {
throw new IOException("ERROR: scan header format error");
}
components[i].setScanCompSel(data.get8());
count++;
final int temp = data.get8();
count++;
components[i].setDcTabSel(temp >> 4);
components[i].setAcTabSel(temp & 0x0F);
}
setSelection(data.get8());
count++;
setSpectralEnd(data.get8());
count++;
final int temp = data.get8();
setAh(temp >> 4);
setAl(temp & 0x0F);
count++;
if (count != length) {
throw new IOException("ERROR: scan header format error [count!=Ns]");
}
return 1;
}
}