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org.apache.xmlgraphics.image.loader.impl.ImageLoaderRawCCITTFax Maven / Gradle / Ivy
/*
* 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
}
}
