org.apache.xmlgraphics.image.loader.impl.ImageLoaderRawCCITTFax Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of org.apache.fop Show documentation
Show all versions of org.apache.fop Show documentation
The core maven build properties
The newest version!
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id: ImageLoaderRawCCITTFax.java 1681108 2015-05-22 13:26:12Z ssteiner $ */
package org.apache.xmlgraphics.image.loader.impl;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;
import javax.imageio.stream.ImageInputStream;
import javax.xml.transform.Source;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.xmlgraphics.image.codec.tiff.TIFFDirectory;
import org.apache.xmlgraphics.image.codec.tiff.TIFFField;
import org.apache.xmlgraphics.image.codec.tiff.TIFFImage;
import org.apache.xmlgraphics.image.codec.tiff.TIFFImageDecoder;
import org.apache.xmlgraphics.image.codec.util.SeekableStream;
import org.apache.xmlgraphics.image.loader.Image;
import org.apache.xmlgraphics.image.loader.ImageException;
import org.apache.xmlgraphics.image.loader.ImageFlavor;
import org.apache.xmlgraphics.image.loader.ImageInfo;
import org.apache.xmlgraphics.image.loader.ImageSessionContext;
import org.apache.xmlgraphics.image.loader.util.ImageUtil;
import org.apache.xmlgraphics.image.loader.util.SeekableStreamAdapter;
import org.apache.xmlgraphics.io.XmlSourceUtil;
import org.apache.xmlgraphics.util.MimeConstants;
import org.apache.xmlgraphics.util.io.SubInputStream;
/**
* ImageLoader for CCITT group 3 and 4 images consumed "raw" (undecoded). Provides a
* raw/undecoded stream.
*/
public class ImageLoaderRawCCITTFax extends AbstractImageLoader implements JPEGConstants {
private static final int COMPRESSION_CCITT_1D = 2;
private static final int COMPRESSION_FAX_GROUP3 = 3;
private static final int COMPRESSION_FAX_GROUP4 = 4;
/** logger */
protected static final Log log = LogFactory.getLog(ImageLoaderRawCCITTFax.class);
/**
* Main constructor.
*/
public ImageLoaderRawCCITTFax() {
}
/** {@inheritDoc} */
public ImageFlavor getTargetFlavor() {
return ImageFlavor.RAW_CCITTFAX;
}
/** {@inheritDoc} */
public Image loadImage(ImageInfo info, Map hints, ImageSessionContext session)
throws ImageException, IOException {
if (!MimeConstants.MIME_TIFF.equals(info.getMimeType())) {
throw new IllegalArgumentException("ImageInfo must be from a image with MIME type: "
+ MimeConstants.MIME_TIFF);
}
int fillOrder = 1;
int compression = TIFFImage.COMP_NONE;
long stripOffset;
long stripLength;
TIFFDirectory dir;
Source src = session.needSource(info.getOriginalURI());
ImageInputStream in = ImageUtil.needImageInputStream(src);
in.mark();
try {
SeekableStream seekable = new SeekableStreamAdapter(in);
dir = new TIFFDirectory(seekable, 0);
TIFFField fld;
fld = dir.getField(TIFFImageDecoder.TIFF_COMPRESSION);
if (fld != null) {
compression = fld.getAsInt(0);
switch (compression) {
case COMPRESSION_CCITT_1D:
case COMPRESSION_FAX_GROUP4:
break;
case COMPRESSION_FAX_GROUP3:
//Note: the TIFFImage compression constants seem to be a bit misleading!
compression = TIFFImage.COMP_FAX_G3_1D; //1D is the default for Group3
fld = dir.getField(TIFFImageDecoder.TIFF_T4_OPTIONS);
if (fld != null) {
long t4Options = fld.getAsLong(0);
if ((t4Options & 0x01) != 0) {
compression = TIFFImage.COMP_FAX_G3_2D; //"Abusing" for 2D signalling
}
}
break;
default:
log.debug("Unsupported compression " + compression);
throw new ImageException(
"ImageLoader doesn't support TIFF compression: " + compression);
}
}
//Read information used for raw embedding
fld = dir.getField(TIFFImageDecoder.TIFF_FILL_ORDER);
if (fld != null) {
fillOrder = fld.getAsInt(0);
}
int stripCount;
fld = dir.getField(TIFFImageDecoder.TIFF_ROWS_PER_STRIP);
if (fld == null) {
stripCount = 1;
} else {
stripCount = (int)(info.getSize().getHeightPx() / fld.getAsLong(0));
}
if (stripCount > 1) {
log.debug("More than one strip found in TIFF image.");
throw new ImageException(
"ImageLoader doesn't support multiple strips");
}
stripOffset = dir.getField(TIFFImageDecoder.TIFF_STRIP_OFFSETS).getAsLong(0);
stripLength = dir.getField(TIFFImageDecoder.TIFF_STRIP_BYTE_COUNTS).getAsLong(0);
} finally {
in.reset();
}
in.seek(stripOffset);
InputStream subin = new SubInputStream(XmlSourceUtil.needInputStream(src), stripLength, true);
if (fillOrder == 2) {
//Decorate to flip bit order
subin = new FillOrderChangeInputStream(subin);
}
ImageRawCCITTFax rawImage = new ImageRawCCITTFax(info, subin, compression);
//Strip stream from source as we pass it on internally
XmlSourceUtil.removeStreams(src);
return rawImage;
}
private static class FillOrderChangeInputStream extends FilterInputStream {
protected FillOrderChangeInputStream(InputStream in) {
super(in);
}
/** {@inheritDoc} */
@Override
public int read(byte[] b, int off, int len) throws IOException {
int result = super.read(b, off, len);
if (result > 0) {
int endpos = off + result;
for (int i = off; i < endpos; i++) {
b[i] = FLIP_TABLE[b[i] & 0xff];
}
}
return result;
}
/** {@inheritDoc} */
@Override
public int read() throws IOException {
int b = super.read();
if (b < 0) {
return b;
} else {
return FLIP_TABLE[b] & 0xff;
}
}
// Table to be used when fillOrder = 2, for flipping bytes.
// Copied from XML Graphics Commons' TIFFFaxDecoder class
private static final byte[] FLIP_TABLE = {
0, -128, 64, -64, 32, -96, 96, -32,
16, -112, 80, -48, 48, -80, 112, -16,
8, -120, 72, -56, 40, -88, 104, -24,
24, -104, 88, -40, 56, -72, 120, -8,
4, -124, 68, -60, 36, -92, 100, -28,
20, -108, 84, -44, 52, -76, 116, -12,
12, -116, 76, -52, 44, -84, 108, -20,
28, -100, 92, -36, 60, -68, 124, -4,
2, -126, 66, -62, 34, -94, 98, -30,
18, -110, 82, -46, 50, -78, 114, -14,
10, -118, 74, -54, 42, -86, 106, -22,
26, -102, 90, -38, 58, -70, 122, -6,
6, -122, 70, -58, 38, -90, 102, -26,
22, -106, 86, -42, 54, -74, 118, -10,
14, -114, 78, -50, 46, -82, 110, -18,
30, -98, 94, -34, 62, -66, 126, -2,
1, -127, 65, -63, 33, -95, 97, -31,
17, -111, 81, -47, 49, -79, 113, -15,
9, -119, 73, -55, 41, -87, 105, -23,
25, -103, 89, -39, 57, -71, 121, -7,
5, -123, 69, -59, 37, -91, 101, -27,
21, -107, 85, -43, 53, -75, 117, -11,
13, -115, 77, -51, 45, -83, 109, -19,
29, -99, 93, -35, 61, -67, 125, -3,
3, -125, 67, -61, 35, -93, 99, -29,
19, -109, 83, -45, 51, -77, 115, -13,
11, -117, 75, -53, 43, -85, 107, -21,
27, -101, 91, -37, 59, -69, 123, -5,
7, -121, 71, -57, 39, -89, 103, -25,
23, -105, 87, -41, 55, -73, 119, -9,
15, -113, 79, -49, 47, -81, 111, -17,
31, -97, 95, -33, 63, -65, 127, -1,
};
// end
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy