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Performance improvement: 

The code is now checking re-use of an already encoded image before actually encoding it. Before, the image was encoded in every case, but only really embedded the first time.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1137971 13f79535-47bb-0310-9956-ffa450edef68
tags/fop-1_1rc1old
Jeremias Maerki 13 years ago
parent
1df8c0b1db
commit
d54e7a6681
2 changed files with 304 additions and 239 deletions
Split View Show Diff Stats
  1. 37
    15
      src/java/org/apache/fop/afp/AFPResourceManager.java
  2. 267
    224
      src/java/org/apache/fop/render/afp/AFPImageHandlerRenderedImage.java

+ 37
- 15
src/java/org/apache/fop/afp/AFPResourceManager.java View File

@@ -66,10 +66,12 @@ public class AFPResourceManager {
private int instreamObjectCount = 0;

/** a mapping of resourceInfo --> include name */
private final Map/*<AFPResourceInfo,String>*/ includeNameMap
= new java.util.HashMap()/*<AFPResourceInfo,String>*/;
private final Map<AFPResourceInfo, String> includeNameMap
= new java.util.HashMap<AFPResourceInfo, String>();

private Map pageSegmentMap = new java.util.HashMap();
/** a mapping of resourceInfo --> page segment name */
private Map<AFPResourceInfo, String> pageSegmentMap
= new java.util.HashMap<AFPResourceInfo, String>();

private AFPResourceLevelDefaults resourceLevelDefaults = new AFPResourceLevelDefaults();

@@ -126,32 +128,49 @@ public class AFPResourceManager {
}

/**
* Creates a new data object in the AFP datastream
*
* Tries to create an include of a data object that has been previously added to the
* AFP data stream. If no such object was available, the method returns false which serves
* as a signal that the object has to be created.
* @param dataObjectInfo the data object info
*
* @return true if the inclusion succeeded, false if the object was not available
* @throws IOException thrown if an I/O exception of some sort has occurred.
*/
public void createObject(AFPDataObjectInfo dataObjectInfo) throws IOException {
AbstractNamedAFPObject namedObj = null;

public boolean tryIncludeObject(AFPDataObjectInfo dataObjectInfo) throws IOException {
AFPResourceInfo resourceInfo = dataObjectInfo.getResourceInfo();
updateResourceInfoUri(resourceInfo);

String objectName = (String)includeNameMap.get(resourceInfo);
String objectName = includeNameMap.get(resourceInfo);
if (objectName != null) {
// an existing data resource so reference it by adding an include to the current page
includeObject(dataObjectInfo, objectName);
return;
return true;
}

objectName = (String)pageSegmentMap.get(resourceInfo);
objectName = pageSegmentMap.get(resourceInfo);
if (objectName != null) {
// an existing data resource so reference it by adding an include to the current page
includePageSegment(dataObjectInfo, objectName);
return true;
}
return false;
}

/**
* Creates a new data object in the AFP datastream
*
* @param dataObjectInfo the data object info
*
* @throws IOException thrown if an I/O exception of some sort has occurred.
*/
public void createObject(AFPDataObjectInfo dataObjectInfo) throws IOException {
if (tryIncludeObject(dataObjectInfo)) {
//Object has already been produced and is available by inclusion, so return early.
return;
}

AbstractNamedAFPObject namedObj = null;
AFPResourceInfo resourceInfo = dataObjectInfo.getResourceInfo();

boolean useInclude = true;
Registry.ObjectType objectType = null;

@@ -194,7 +213,7 @@ public class AFPResourceManager {
resourceGroup.addObject(namedObj);

// create the include object
objectName = namedObj.getName();
String objectName = namedObj.getName();
if (usePageSegment) {
includePageSegment(dataObjectInfo, objectName);
pageSegmentMap.put(resourceInfo, objectName);
@@ -296,7 +315,7 @@ public class AFPResourceManager {
resourceInfo.setName(resourceName);
resourceInfo.setUri(uri.toASCIIString());

String objectName = (String)includeNameMap.get(resourceInfo);
String objectName = includeNameMap.get(resourceInfo);
if (objectName == null) {
if (log.isDebugEnabled()) {
log.debug("Adding included resource: " + resourceName);
@@ -334,7 +353,7 @@ public class AFPResourceManager {
resourceInfo.setName(resourceName);
resourceInfo.setUri(uri.toASCIIString());

String resource = (String)includeNameMap.get(resourceInfo);
String resource = includeNameMap.get(resourceInfo);
if (resource == null) {

ResourceGroup resourceGroup = streamer.getResourceGroup(resourceLevel);
@@ -343,6 +362,7 @@ public class AFPResourceManager {
//The included resource may already be wrapped in a resource object
AbstractNamedAFPObject resourceObject = new AbstractNamedAFPObject(null) {

@Override
protected void writeContent(OutputStream os) throws IOException {
InputStream inputStream = null;
try {
@@ -355,8 +375,10 @@ public class AFPResourceManager {
}

//bypass super.writeStart
@Override
protected void writeStart(OutputStream os) throws IOException { }
//bypass super.writeEnd
@Override
protected void writeEnd(OutputStream os) throws IOException { }
};


+ 267
- 224
src/java/org/apache/fop/render/afp/AFPImageHandlerRenderedImage.java View File

@@ -68,226 +68,6 @@ public class AFPImageHandlerRenderedImage extends AFPImageHandler implements Ima
ImageFlavor.RENDERED_IMAGE
};

private AFPDataObjectInfo updateDataObjectInfo // CSOK: MethodLength
(AFPImageObjectInfo imageObjectInfo,
AFPPaintingState paintingState, ImageRendered imageRendered, Dimension targetSize)
throws IOException {

long start = System.currentTimeMillis();

int resolution = paintingState.getResolution();
int maxPixelSize = paintingState.getBitsPerPixel();
if (paintingState.isColorImages()) {
if (paintingState.isCMYKImagesSupported()) {
maxPixelSize *= 4; //CMYK is maximum
} else {
maxPixelSize *= 3; //RGB is maximum
}
}
float ditheringQuality = paintingState.getDitheringQuality();
RenderedImage renderedImage = imageRendered.getRenderedImage();

ImageInfo imageInfo = imageRendered.getInfo();
ImageSize intrinsicSize = imageInfo.getSize();

boolean useFS10 = (maxPixelSize == 1) || BitmapImageUtil.isMonochromeImage(renderedImage);
int functionSet = useFS10 ? 10 : 11;
boolean usePageSegments = useFS10
&& !imageObjectInfo.getResourceInfo().getLevel().isInline();

ImageSize effIntrinsicSize = intrinsicSize;
if (usePageSegments) {
//Resize, optionally resample and convert image
Dimension resampledDim = new Dimension(
(int)Math.ceil(UnitConv.mpt2px(targetSize.getWidth(), resolution)),
(int)Math.ceil(UnitConv.mpt2px(targetSize.getHeight(), resolution)));

imageObjectInfo.setCreatePageSegment(true);
imageObjectInfo.getResourceInfo().setImageDimension(resampledDim);

//Only resample/downsample if image is smaller than its intrinsic size
//to make print file smaller
boolean resample = resampledDim.width < renderedImage.getWidth()
&& resampledDim.height < renderedImage.getHeight();
if (resample) {
if (log.isDebugEnabled()) {
log.debug("Resample from " + intrinsicSize.getDimensionPx()
+ " to " + resampledDim);
}
renderedImage = BitmapImageUtil.convertToMonochrome(renderedImage,
resampledDim, ditheringQuality);
effIntrinsicSize = new ImageSize(
resampledDim.width, resampledDim.height, resolution);
} else if (ditheringQuality >= 0.5f) {
renderedImage = BitmapImageUtil.convertToMonochrome(renderedImage,
intrinsicSize.getDimensionPx(), ditheringQuality);
}
}

imageObjectInfo.setDataHeightRes((int)Math.round(
effIntrinsicSize.getDpiHorizontal() * 10));
imageObjectInfo.setDataWidthRes((int)Math.round(
effIntrinsicSize.getDpiVertical() * 10));

int dataHeight = renderedImage.getHeight();
imageObjectInfo.setDataHeight(dataHeight);

int dataWidth = renderedImage.getWidth();
imageObjectInfo.setDataWidth(dataWidth);

//TODO To reduce AFP file size, investigate using a compression scheme.
//Currently, all image data is uncompressed.
ColorModel cm = renderedImage.getColorModel();
if (log.isTraceEnabled()) {
log.trace("ColorModel: " + cm);
}
int pixelSize = cm.getPixelSize();
if (cm.hasAlpha()) {
pixelSize -= 8;
}

byte[] imageData = null;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
boolean allowDirectEncoding = true;
if (allowDirectEncoding && (pixelSize <= maxPixelSize)) {
//Attempt to encode without resampling the image
ImageEncodingHelper helper = new ImageEncodingHelper(renderedImage, pixelSize == 32);
ColorModel encodedColorModel = helper.getEncodedColorModel();
boolean directEncode = true;
if (helper.getEncodedColorModel().getPixelSize() > maxPixelSize) {
directEncode = false; //pixel size needs to be reduced
}
if (BitmapImageUtil.getColorIndexSize(renderedImage) > 2) {
directEncode = false; //Lookup tables are not implemented, yet
}
if (useFS10
&& BitmapImageUtil.isMonochromeImage(renderedImage)
&& BitmapImageUtil.isZeroBlack(renderedImage)) {
directEncode = false;
//need a special method to invert the bit-stream since setting the subtractive mode
//in AFP alone doesn't seem to do the trick.
if (encodeInvertedBilevel(helper, imageObjectInfo, baos)) {
imageData = baos.toByteArray();
}
}
if (directEncode) {
log.debug("Encoding image directly...");
imageObjectInfo.setBitsPerPixel(encodedColorModel.getPixelSize());
if (pixelSize == 32) {
functionSet = 45; //IOCA FS45 required for CMYK
}

helper.encode(baos);
imageData = baos.toByteArray();
}
}
if (imageData == null) {
log.debug("Encoding image via RGB...");

//Convert image to 24bit RGB
ImageEncodingHelper.encodeRenderedImageAsRGB(renderedImage, baos);
imageData = baos.toByteArray();
imageObjectInfo.setBitsPerPixel(24);

boolean colorImages = paintingState.isColorImages();
imageObjectInfo.setColor(colorImages);

// convert to grayscale
if (!colorImages) {
log.debug("Converting RGB image to grayscale...");
baos.reset();
int bitsPerPixel = paintingState.getBitsPerPixel();
imageObjectInfo.setBitsPerPixel(bitsPerPixel);
//TODO this should be done off the RenderedImage to avoid buffering the
//intermediate 24bit image
ImageEncodingHelper.encodeRGBAsGrayScale(
imageData, dataWidth, dataHeight, bitsPerPixel, baos);
imageData = baos.toByteArray();
if (bitsPerPixel == 1) {
imageObjectInfo.setSubtractive(true);
}
}
}

switch (functionSet) {
case 10:
imageObjectInfo.setMimeType(MimeConstants.MIME_AFP_IOCA_FS10);
break;
case 11:
imageObjectInfo.setMimeType(MimeConstants.MIME_AFP_IOCA_FS11);
break;
case 45:
imageObjectInfo.setMimeType(MimeConstants.MIME_AFP_IOCA_FS45);
break;
default:
throw new IllegalStateException("Invalid IOCA function set: " + functionSet);
}

imageObjectInfo.setData(imageData);

// set object area info
AFPObjectAreaInfo objectAreaInfo = imageObjectInfo.getObjectAreaInfo();
objectAreaInfo.setWidthRes(resolution);
objectAreaInfo.setHeightRes(resolution);

if (log.isDebugEnabled()) {
long duration = System.currentTimeMillis() - start;
log.debug("Image encoding took " + duration + "ms.");
}

return imageObjectInfo;
}

/**
* Efficiently encodes a bi-level image in inverted form as a plain bit-stream.
* @param helper the image encoding helper used to analyze the image
* @param imageObjectInfo the AFP image object
* @param out the output stream
* @return true if the image was encoded, false if there was something prohibiting that
* @throws IOException if an I/O error occurs
*/
private boolean encodeInvertedBilevel(ImageEncodingHelper helper,
AFPImageObjectInfo imageObjectInfo, OutputStream out) throws IOException {
RenderedImage renderedImage = helper.getImage();
if (!BitmapImageUtil.isMonochromeImage(renderedImage)) {
throw new IllegalStateException("This method only supports binary images!");
}
int tiles = renderedImage.getNumXTiles() * renderedImage.getNumYTiles();
if (tiles > 1) {
return false;
}
SampleModel sampleModel = renderedImage.getSampleModel();
SampleModel expectedSampleModel = new MultiPixelPackedSampleModel(DataBuffer.TYPE_BYTE,
renderedImage.getWidth(), renderedImage.getHeight(), 1);
if (!expectedSampleModel.equals(sampleModel)) {
return false; //Pixels are not packed
}

imageObjectInfo.setBitsPerPixel(1);

Raster raster = renderedImage.getTile(0, 0);
DataBuffer buffer = raster.getDataBuffer();
if (buffer instanceof DataBufferByte) {
DataBufferByte byteBuffer = (DataBufferByte)buffer;
log.debug("Encoding image as inverted bi-level...");
byte[] rawData = byteBuffer.getData();
int remaining = rawData.length;
int pos = 0;
byte[] data = new byte[4096];
while (remaining > 0) {
int size = Math.min(remaining, data.length);
for (int i = 0; i < size; i++) {
data[i] = (byte)~rawData[pos]; //invert bits
pos++;
}
out.write(data, 0, size);
remaining -= size;
}
return true;
}
return false;
}

private void setDefaultResourceLevel(AFPImageObjectInfo imageObjectInfo,
AFPResourceManager resourceManager) {
AFPResourceInfo resourceInfo = imageObjectInfo.getResourceInfo();
@@ -324,6 +104,7 @@ public class AFPImageHandlerRenderedImage extends AFPImageHandler implements Ima
AFPRenderingContext afpContext = (AFPRenderingContext)context;

AFPImageObjectInfo imageObjectInfo = (AFPImageObjectInfo)createDataObjectInfo();
AFPPaintingState paintingState = afpContext.getPaintingState();

// set resource information
setResourceInformation(imageObjectInfo,
@@ -332,15 +113,28 @@ public class AFPImageHandlerRenderedImage extends AFPImageHandler implements Ima
setDefaultResourceLevel(imageObjectInfo, afpContext.getResourceManager());

// Positioning
imageObjectInfo.setObjectAreaInfo(createObjectAreaInfo(afpContext.getPaintingState(), pos));
imageObjectInfo.setObjectAreaInfo(createObjectAreaInfo(paintingState, pos));
Dimension targetSize = pos.getSize();


// Image content
ImageRendered imageRend = (ImageRendered)image;
updateDataObjectInfo(imageObjectInfo, afpContext.getPaintingState(), imageRend, targetSize);
RenderedImageEncoder encoder = new RenderedImageEncoder(imageRend, targetSize);
encoder.prepareEncoding(imageObjectInfo, paintingState);

boolean included = afpContext.getResourceManager().tryIncludeObject(imageObjectInfo);
if (!included) {
long start = System.currentTimeMillis();
//encode only if the same image has not been encoded, yet
encoder.encodeImage(imageObjectInfo, paintingState);
if (log.isDebugEnabled()) {
long duration = System.currentTimeMillis() - start;
log.debug("Image encoding took " + duration + "ms.");
}

// Create image
afpContext.getResourceManager().createObject(imageObjectInfo);
// Create image
afpContext.getResourceManager().createObject(imageObjectInfo);
}
}

/** {@inheritDoc} */
@@ -349,4 +143,253 @@ public class AFPImageHandlerRenderedImage extends AFPImageHandler implements Ima
&& targetContext instanceof AFPRenderingContext;
}

private static final class RenderedImageEncoder {

private ImageRendered imageRendered;
private Dimension targetSize;

private boolean useFS10;
private int maxPixelSize;
private boolean usePageSegments;
private Dimension resampledDim;
private ImageSize intrinsicSize;
private ImageSize effIntrinsicSize;

private RenderedImageEncoder(ImageRendered imageRendered, Dimension targetSize) {
this.imageRendered = imageRendered;
this.targetSize = targetSize;

}

private void prepareEncoding(AFPImageObjectInfo imageObjectInfo,
AFPPaintingState paintingState) {
maxPixelSize = paintingState.getBitsPerPixel();
if (paintingState.isColorImages()) {
if (paintingState.isCMYKImagesSupported()) {
maxPixelSize *= 4; //CMYK is maximum
} else {
maxPixelSize *= 3; //RGB is maximum
}
}
RenderedImage renderedImage = imageRendered.getRenderedImage();
useFS10 = (maxPixelSize == 1) || BitmapImageUtil.isMonochromeImage(renderedImage);

ImageInfo imageInfo = imageRendered.getInfo();
this.intrinsicSize = imageInfo.getSize();
this.effIntrinsicSize = intrinsicSize;

AFPResourceInfo resourceInfo = imageObjectInfo.getResourceInfo();
this.usePageSegments = useFS10 && !resourceInfo.getLevel().isInline();
if (usePageSegments) {
//The image may need to be resized/resampled for use as a page segment
int resolution = paintingState.getResolution();
this.resampledDim = new Dimension(
(int)Math.ceil(UnitConv.mpt2px(targetSize.getWidth(), resolution)),
(int)Math.ceil(UnitConv.mpt2px(targetSize.getHeight(), resolution)));
resourceInfo.setImageDimension(resampledDim);
effIntrinsicSize = new ImageSize(
resampledDim.width, resampledDim.height, resolution);
}

//Update image object info
imageObjectInfo.setDataHeightRes((int)Math.round(
effIntrinsicSize.getDpiHorizontal() * 10));
imageObjectInfo.setDataWidthRes((int)Math.round(
effIntrinsicSize.getDpiVertical() * 10));
imageObjectInfo.setDataHeight(effIntrinsicSize.getHeightPx());
imageObjectInfo.setDataWidth(effIntrinsicSize.getWidthPx());

// set object area info
int resolution = paintingState.getResolution();
AFPObjectAreaInfo objectAreaInfo = imageObjectInfo.getObjectAreaInfo();
objectAreaInfo.setWidthRes(resolution);
objectAreaInfo.setHeightRes(resolution);
}

private AFPDataObjectInfo encodeImage
(AFPImageObjectInfo imageObjectInfo,
AFPPaintingState paintingState)
throws IOException {

RenderedImage renderedImage = imageRendered.getRenderedImage();
int functionSet = useFS10 ? 10 : 11;

if (usePageSegments) {
assert resampledDim != null;
//Resize, optionally resample and convert image

imageObjectInfo.setCreatePageSegment(true);

float ditheringQuality = paintingState.getDitheringQuality();
//Only resample/downsample if image is smaller than its intrinsic size
//to make print file smaller
boolean resample = resampledDim.width < renderedImage.getWidth()
&& resampledDim.height < renderedImage.getHeight();
if (resample) {
if (log.isDebugEnabled()) {
log.debug("Resample from " + intrinsicSize.getDimensionPx()
+ " to " + resampledDim);
}
renderedImage = BitmapImageUtil.convertToMonochrome(renderedImage,
resampledDim, ditheringQuality);
} else if (ditheringQuality >= 0.5f) {
renderedImage = BitmapImageUtil.convertToMonochrome(renderedImage,
intrinsicSize.getDimensionPx(), ditheringQuality);
}
}

//TODO To reduce AFP file size, investigate using a compression scheme.
//Currently, all image data is uncompressed.
ColorModel cm = renderedImage.getColorModel();
if (log.isTraceEnabled()) {
log.trace("ColorModel: " + cm);
}
int pixelSize = cm.getPixelSize();
if (cm.hasAlpha()) {
pixelSize -= 8;
}

byte[] imageData = null;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
boolean allowDirectEncoding = true;
if (allowDirectEncoding && (pixelSize <= maxPixelSize)) {
//Attempt to encode without resampling the image
ImageEncodingHelper helper = new ImageEncodingHelper(renderedImage,
pixelSize == 32);
ColorModel encodedColorModel = helper.getEncodedColorModel();
boolean directEncode = true;
if (helper.getEncodedColorModel().getPixelSize() > maxPixelSize) {
directEncode = false; //pixel size needs to be reduced
}
if (BitmapImageUtil.getColorIndexSize(renderedImage) > 2) {
directEncode = false; //Lookup tables are not implemented, yet
}
if (useFS10
&& BitmapImageUtil.isMonochromeImage(renderedImage)
&& BitmapImageUtil.isZeroBlack(renderedImage)) {
directEncode = false;
//need a special method to invert the bit-stream since setting the
//subtractive mode in AFP alone doesn't seem to do the trick.
if (encodeInvertedBilevel(helper, imageObjectInfo, baos)) {
imageData = baos.toByteArray();
}
}
if (directEncode) {
log.debug("Encoding image directly...");
imageObjectInfo.setBitsPerPixel(encodedColorModel.getPixelSize());
if (pixelSize == 32) {
functionSet = 45; //IOCA FS45 required for CMYK
}

helper.encode(baos);
imageData = baos.toByteArray();
}
}
if (imageData == null) {
log.debug("Encoding image via RGB...");
imageData = encodeViaRGB(renderedImage, imageObjectInfo, paintingState, baos);
}

switch (functionSet) {
case 10:
imageObjectInfo.setMimeType(MimeConstants.MIME_AFP_IOCA_FS10);
break;
case 11:
imageObjectInfo.setMimeType(MimeConstants.MIME_AFP_IOCA_FS11);
break;
case 45:
imageObjectInfo.setMimeType(MimeConstants.MIME_AFP_IOCA_FS45);
break;
default:
throw new IllegalStateException("Invalid IOCA function set: " + functionSet);
}

imageObjectInfo.setData(imageData);

return imageObjectInfo;
}

private byte[] encodeViaRGB(RenderedImage renderedImage,
AFPImageObjectInfo imageObjectInfo, AFPPaintingState paintingState,
ByteArrayOutputStream baos) throws IOException {
byte[] imageData;
//Convert image to 24bit RGB
ImageEncodingHelper.encodeRenderedImageAsRGB(renderedImage, baos);
imageData = baos.toByteArray();
imageObjectInfo.setBitsPerPixel(24);

boolean colorImages = paintingState.isColorImages();
imageObjectInfo.setColor(colorImages);

// convert to grayscale
if (!colorImages) {
log.debug("Converting RGB image to grayscale...");
baos.reset();
int bitsPerPixel = paintingState.getBitsPerPixel();
imageObjectInfo.setBitsPerPixel(bitsPerPixel);
//TODO this should be done off the RenderedImage to avoid buffering the
//intermediate 24bit image
ImageEncodingHelper.encodeRGBAsGrayScale(
imageData, renderedImage.getWidth(), renderedImage.getHeight(),
bitsPerPixel, baos);
imageData = baos.toByteArray();
if (bitsPerPixel == 1) {
imageObjectInfo.setSubtractive(true);
}
}
return imageData;
}

/**
* Efficiently encodes a bi-level image in inverted form as a plain bit-stream.
* @param helper the image encoding helper used to analyze the image
* @param imageObjectInfo the AFP image object
* @param out the output stream
* @return true if the image was encoded, false if there was something prohibiting that
* @throws IOException if an I/O error occurs
*/
private boolean encodeInvertedBilevel(ImageEncodingHelper helper,
AFPImageObjectInfo imageObjectInfo, OutputStream out) throws IOException {
RenderedImage renderedImage = helper.getImage();
if (!BitmapImageUtil.isMonochromeImage(renderedImage)) {
throw new IllegalStateException("This method only supports binary images!");
}
int tiles = renderedImage.getNumXTiles() * renderedImage.getNumYTiles();
if (tiles > 1) {
return false;
}
SampleModel sampleModel = renderedImage.getSampleModel();
SampleModel expectedSampleModel = new MultiPixelPackedSampleModel(DataBuffer.TYPE_BYTE,
renderedImage.getWidth(), renderedImage.getHeight(), 1);
if (!expectedSampleModel.equals(sampleModel)) {
return false; //Pixels are not packed
}

imageObjectInfo.setBitsPerPixel(1);

Raster raster = renderedImage.getTile(0, 0);
DataBuffer buffer = raster.getDataBuffer();
if (buffer instanceof DataBufferByte) {
DataBufferByte byteBuffer = (DataBufferByte)buffer;
log.debug("Encoding image as inverted bi-level...");
byte[] rawData = byteBuffer.getData();
int remaining = rawData.length;
int pos = 0;
byte[] data = new byte[4096];
while (remaining > 0) {
int size = Math.min(remaining, data.length);
for (int i = 0; i < size; i++) {
data[i] = (byte)~rawData[pos]; //invert bits
pos++;
}
out.write(data, 0, size);
remaining -= size;
}
return true;
}
return false;
}

}

}

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