Source code

001/*
002 *  Licensed under the Apache License, Version 2.0 (the "License");
003 *  you may not use this file except in compliance with the License.
004 *  You may obtain a copy of the License at
005 *
006 *       http://www.apache.org/licenses/LICENSE-2.0
007 *
008 *  Unless required by applicable law or agreed to in writing, software
009 *  distributed under the License is distributed on an "AS IS" BASIS,
010 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
011 *  See the License for the specific language governing permissions and
012 *  limitations under the License.
013 *  under the License.
014 */
015package org.apache.commons.imaging.formats.wbmp;
016
017import static org.apache.commons.imaging.common.BinaryFunctions.readByte;
018import static org.apache.commons.imaging.common.BinaryFunctions.readBytes;
019
020import java.awt.Dimension;
021import java.awt.image.BufferedImage;
022import java.awt.image.DataBuffer;
023import java.awt.image.DataBufferByte;
024import java.awt.image.IndexColorModel;
025import java.awt.image.Raster;
026import java.awt.image.WritableRaster;
027import java.io.IOException;
028import java.io.InputStream;
029import java.io.OutputStream;
030import java.io.PrintWriter;
031import java.util.ArrayList;
032import java.util.Properties;
033
034import org.apache.commons.imaging.AbstractImageParser;
035import org.apache.commons.imaging.ImageFormat;
036import org.apache.commons.imaging.ImageFormats;
037import org.apache.commons.imaging.ImageInfo;
038import org.apache.commons.imaging.ImagingException;
039import org.apache.commons.imaging.bytesource.ByteSource;
040import org.apache.commons.imaging.common.ImageMetadata;
041
042public class WbmpImageParser extends AbstractImageParser<WbmpImagingParameters> {
043
044    static class WbmpHeader {
045        final int typeField;
046        final byte fixHeaderField;
047        final int width;
048        final int height;
049
050        WbmpHeader(final int typeField, final byte fixHeaderField, final int width, final int height) {
051            this.typeField = typeField;
052            this.fixHeaderField = fixHeaderField;
053            this.width = width;
054            this.height = height;
055        }
056
057        public void dump(final PrintWriter pw) {
058            pw.println("WbmpHeader");
059            pw.println("TypeField: " + typeField);
060            pw.println("FixHeaderField: 0x" + Integer.toHexString(0xff & fixHeaderField));
061            pw.println("Width: " + width);
062            pw.println("Height: " + height);
063        }
064    }
065
066    private static final String DEFAULT_EXTENSION = ImageFormats.WBMP.getDefaultExtension();
067
068    private static final String[] ACCEPTED_EXTENSIONS = ImageFormats.WBMP.getExtensions();
069
070    @Override
071    public boolean dumpImageFile(final PrintWriter pw, final ByteSource byteSource) throws ImagingException, IOException {
072        readWbmpHeader(byteSource).dump(pw);
073        return true;
074    }
075
076    @Override
077    protected String[] getAcceptedExtensions() {
078        return ACCEPTED_EXTENSIONS;
079    }
080
081    @Override
082    protected ImageFormat[] getAcceptedTypes() {
083        return new ImageFormat[] { ImageFormats.WBMP, //
084        };
085    }
086
087    @Override
088    public final BufferedImage getBufferedImage(final ByteSource byteSource, final WbmpImagingParameters params) throws ImagingException, IOException {
089        try (InputStream is = byteSource.getInputStream()) {
090            final WbmpHeader wbmpHeader = readWbmpHeader(is);
091            return readImage(wbmpHeader, is);
092        }
093    }
094
095    @Override
096    public String getDefaultExtension() {
097        return DEFAULT_EXTENSION;
098    }
099
100    @Override
101    public WbmpImagingParameters getDefaultParameters() {
102        return new WbmpImagingParameters();
103    }
104
105    @Override
106    public byte[] getIccProfileBytes(final ByteSource byteSource, final WbmpImagingParameters params) throws ImagingException, IOException {
107        return null;
108    }
109
110    @Override
111    public ImageInfo getImageInfo(final ByteSource byteSource, final WbmpImagingParameters params) throws ImagingException, IOException {
112        final WbmpHeader wbmpHeader = readWbmpHeader(byteSource);
113        return new ImageInfo("WBMP", 1, new ArrayList<>(), ImageFormats.WBMP, "Wireless Application Protocol Bitmap", wbmpHeader.height, "image/vnd.wap.wbmp",
114                1, 0, 0, 0, 0, wbmpHeader.width, false, false, false, ImageInfo.ColorType.BW, ImageInfo.CompressionAlgorithm.NONE);
115    }
116
117    @Override
118    public Dimension getImageSize(final ByteSource byteSource, final WbmpImagingParameters params) throws ImagingException, IOException {
119        final WbmpHeader wbmpHeader = readWbmpHeader(byteSource);
120        return new Dimension(wbmpHeader.width, wbmpHeader.height);
121    }
122
123    @Override
124    public ImageMetadata getMetadata(final ByteSource byteSource, final WbmpImagingParameters params) throws ImagingException, IOException {
125        return null;
126    }
127
128    @Override
129    public String getName() {
130        return "Wireless Application Protocol Bitmap Format";
131    }
132
133    private BufferedImage readImage(final WbmpHeader wbmpHeader, final InputStream is) throws IOException {
134        final int rowLength = (wbmpHeader.width + 7) / 8;
135        final byte[] image = readBytes("Pixels", is, rowLength * wbmpHeader.height, "Error reading image pixels");
136        final DataBufferByte dataBuffer = new DataBufferByte(image, image.length);
137        final WritableRaster raster = Raster.createPackedRaster(dataBuffer, wbmpHeader.width, wbmpHeader.height, 1, null);
138        final int[] palette = { 0x000000, 0xffffff };
139        final IndexColorModel colorModel = new IndexColorModel(1, 2, palette, 0, false, -1, DataBuffer.TYPE_BYTE);
140        return new BufferedImage(colorModel, raster, colorModel.isAlphaPremultiplied(), new Properties());
141    }
142
143    private int readMultiByteInteger(final InputStream is) throws ImagingException, IOException {
144        int value = 0;
145        int nextByte;
146        int totalBits = 0;
147        do {
148            nextByte = readByte("Header", is, "Error reading WBMP header");
149            value <<= 7;
150            value |= nextByte & 0x7f;
151            totalBits += 7;
152            if (totalBits > 31) {
153                throw new ImagingException("Overflow reading WBMP multi-byte field");
154            }
155        } while ((nextByte & 0x80) != 0);
156        return value;
157    }
158
159    private WbmpHeader readWbmpHeader(final ByteSource byteSource) throws ImagingException, IOException {
160        try (InputStream is = byteSource.getInputStream()) {
161            return readWbmpHeader(is);
162        }
163    }
164
165    private WbmpHeader readWbmpHeader(final InputStream is) throws ImagingException, IOException {
166        final int typeField = readMultiByteInteger(is);
167        if (typeField != 0) {
168            throw new ImagingException("Invalid/unsupported WBMP type " + typeField);
169        }
170
171        final byte fixHeaderField = readByte("FixHeaderField", is, "Invalid WBMP File");
172        if ((fixHeaderField & 0x9f) != 0) {
173            throw new ImagingException("Invalid/unsupported WBMP FixHeaderField 0x" + Integer.toHexString(0xff & fixHeaderField));
174        }
175
176        final int width = readMultiByteInteger(is);
177
178        final int height = readMultiByteInteger(is);
179
180        return new WbmpHeader(typeField, fixHeaderField, width, height);
181    }
182
183    @Override
184    public void writeImage(final BufferedImage src, final OutputStream os, final WbmpImagingParameters params) throws ImagingException, IOException {
185        writeMultiByteInteger(os, 0); // typeField
186        os.write(0); // fixHeaderField
187        writeMultiByteInteger(os, src.getWidth());
188        writeMultiByteInteger(os, src.getHeight());
189
190        for (int y = 0; y < src.getHeight(); y++) {
191            int pixel = 0;
192            int nextBit = 0x80;
193            for (int x = 0; x < src.getWidth(); x++) {
194                final int argb = src.getRGB(x, y);
195                final int red = 0xff & argb >> 16;
196                final int green = 0xff & argb >> 8;
197                final int blue = 0xff & argb >> 0;
198                final int sample = (red + green + blue) / 3;
199                if (sample > 127) {
200                    pixel |= nextBit;
201                }
202                nextBit >>>= 1;
203                if (nextBit == 0) {
204                    os.write(pixel);
205                    pixel = 0;
206                    nextBit = 0x80;
207                }
208            }
209            if (nextBit != 0x80) {
210                os.write(pixel);
211            }
212        }
213    }
214
215    private void writeMultiByteInteger(final OutputStream os, final int value) throws IOException {
216        boolean wroteYet = false;
217        for (int position = 4 * 7; position > 0; position -= 7) {
218            final int next7Bits = 0x7f & value >>> position;
219            if (next7Bits != 0 || wroteYet) {
220                os.write(0x80 | next7Bits);
221                wroteYet = true;
222            }
223        }
224        os.write(0x7f & value);
225    }
226}