19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage org.apache.harmony.awt.gl.image; 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project// A simple PNG decoder source code in Java. 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.awt.Graphics; 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.awt.Insets; 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.awt.image.BufferedImage; 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.awt.image.ColorModel; 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.awt.image.DataBuffer; 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.awt.image.DataBufferByte; 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.awt.image.IndexColorModel; 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.awt.image.Raster; 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.awt.image.WritableRaster; 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.ByteArrayInputStream; 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.ByteArrayOutputStream; 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.DataInputStream; 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.EOFException; 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.IOException; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.InputStream; 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.UnsupportedEncodingException; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.util.zip.CRC32; 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.util.zip.InflaterInputStream; 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project//import javax.swing.JFrame; 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class PngDecoderJava { 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static void main(String[] args) throws Exception { 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project String name = "logo.png"; 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (args.length > 0) 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project name = args[0]; 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project InputStream in = PngDecoderJava.class.getResourceAsStream(name); 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final BufferedImage image = PngDecoderJava.decode(in); 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project in.close(); 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project JFrame f = new JFrame() { 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void paint(Graphics g) { 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Insets insets = getInsets(); 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project g.drawImage(image, insets.left, insets.top, null); 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project }; 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project f.setVisible(true); 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Insets insets = f.getInsets(); 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project f.setSize(image.getWidth() + insets.left + insets.right, image 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project .getHeight() 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + insets.top + insets.bottom); 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static BufferedImage decode(InputStream in) throws IOException { 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project DataInputStream dataIn = new DataInputStream(in); 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project readSignature(dataIn); 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project PNGData chunks = readChunks(dataIn); 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project long widthLong = chunks.getWidth(); 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project long heightLong = chunks.getHeight(); 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (widthLong > Integer.MAX_VALUE || heightLong > Integer.MAX_VALUE) 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IOException("That image is too wide or tall."); 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int width = (int) widthLong; 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = (int) heightLong; 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ColorModel cm = chunks.getColorModel(); 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project WritableRaster raster = chunks.getRaster(); 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project BufferedImage image = new BufferedImage(cm, raster, false, null); 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return image; 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected static void readSignature(DataInputStream in) throws IOException { 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project long signature = in.readLong(); 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (signature != 0x89504e470d0a1a0aL) 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IOException("PNG signature not found!"); 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected static PNGData readChunks(DataInputStream in) throws IOException { 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project PNGData chunks = new PNGData(); 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean trucking = true; 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project while (trucking) { 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project try { 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Read the length. 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int length = in.readInt(); 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (length < 0) 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IOException("Sorry, that file is too long."); 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Read the type. 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project byte[] typeBytes = new byte[4]; 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project in.readFully(typeBytes); 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Read the data. 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project byte[] data = new byte[length]; 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project in.readFully(data); 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Read the CRC. 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project long crc = in.readInt() & 0x00000000ffffffffL; // Make it 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // unsigned. 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (verifyCRC(typeBytes, data, crc) == false) 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IOException("That file appears to be corrupted."); 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project PNGChunk chunk = new PNGChunk(typeBytes, data); 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project chunks.add(chunk); 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } catch (EOFException eofe) { 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project trucking = false; 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return chunks; 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected static boolean verifyCRC(byte[] typeBytes, byte[] data, long crc) { 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project CRC32 crc32 = new CRC32(); 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project crc32.update(typeBytes); 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project crc32.update(data); 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project long calculated = crc32.getValue(); 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (calculated == crc); 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectclass PNGData { 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mNumberOfChunks; 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private PNGChunk[] mChunks; 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public PNGData() { 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mNumberOfChunks = 0; 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mChunks = new PNGChunk[10]; 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void add(PNGChunk chunk) { 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mChunks[mNumberOfChunks++] = chunk; 1289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mNumberOfChunks >= mChunks.length) { 1299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project PNGChunk[] largerArray = new PNGChunk[mChunks.length + 10]; 1309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project System.arraycopy(mChunks, 0, largerArray, 0, mChunks.length); 1319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mChunks = largerArray; 1329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public long getWidth() { 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return getChunk("IHDR").getUnsignedInt(0); 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public long getHeight() { return getChunk("IHDR").getUnsignedInt(4); 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public short getBitsPerPixel() { 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return getChunk("IHDR").getUnsignedByte(8); 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public short getColorType() { 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return getChunk("IHDR").getUnsignedByte(9); 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public short getCompression() { 1519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return getChunk("IHDR").getUnsignedByte(10); 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public short getFilter() { 1559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return getChunk("IHDR").getUnsignedByte(11); 1569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public short getInterlace() { 1599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return getChunk("IHDR").getUnsignedByte(12); 1609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ColorModel getColorModel() { 1639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project short colorType = getColorType(); 1649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int bitsPerPixel = getBitsPerPixel(); 1659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (colorType == 3) { 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project byte[] paletteData = getChunk("PLTE").getData(); 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int paletteLength = paletteData.length / 3; 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return new IndexColorModel(bitsPerPixel, paletteLength, 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project paletteData, 0, false); 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project System.out.println("Unsupported color type: " + colorType); 1739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return null; 1749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public WritableRaster getRaster() { 1779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int width = (int) getWidth(); 1789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = (int) getHeight(); 1799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int bitsPerPixel = getBitsPerPixel(); 1809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project short colorType = getColorType(); 1819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (colorType == 3) { 1839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project byte[] imageData = getImageData(); 1849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project //Orig: DataBuffer db = new DataBufferByte(imageData, imageData.length); 1859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int len = Math.max(imageData.length, (width - 1) * (height -1)); 1869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project DataBuffer db = new DataBufferByte(imageData, len); 1879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project WritableRaster raster = Raster.createPackedRaster(db, width, 1889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project height, bitsPerPixel, null); 1899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return raster; 1909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else 1919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project System.out.println("Unsupported color type!"); 1929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return null; 1939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public byte[] getImageData() { 1969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project try { 1979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ByteArrayOutputStream out = new ByteArrayOutputStream(); 1989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Write all the IDAT data into the array. 1999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < mNumberOfChunks; i++) { 2009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project PNGChunk chunk = mChunks[i]; 2019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (chunk.getTypeString().equals("IDAT")) { 2029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project out.write(chunk.getData()); 2039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project out.flush(); 2069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Now deflate the data. 2079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project InflaterInputStream in = new InflaterInputStream( 2089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project new ByteArrayInputStream(out.toByteArray())); 2099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ByteArrayOutputStream inflatedOut = new ByteArrayOutputStream(); 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int readLength; 2119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project byte[] block = new byte[8192]; 2129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project while ((readLength = in.read(block)) != -1) 2139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project inflatedOut.write(block, 0, readLength); 2149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project inflatedOut.flush(); 2159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project byte[] imageData = inflatedOut.toByteArray(); 2169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Compute the real length. 2179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int width = (int) getWidth(); 2189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = (int) getHeight(); 2199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int bitsPerPixel = getBitsPerPixel(); 2209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int length = width * height * bitsPerPixel / 8; 2219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project byte[] prunedData = new byte[length]; 2239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // We can only deal with non-interlaced images. 2259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getInterlace() == 0) { 2269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int index = 0; 2279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < length; i++) { 2289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((i * 8 / bitsPerPixel) % width == 0) { 2299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project index++; // Skip the filter byte. 2309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project prunedData[i] = imageData[index++]; 2329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else 2349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project System.out.println("Couldn't undo interlacing."); 2359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return prunedData; 2379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } catch (IOException ioe) { 2389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return null; 2409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public PNGChunk getChunk(String type) { 2439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < mNumberOfChunks; i++) 2449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mChunks[i].getTypeString().equals(type)) 2459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mChunks[i]; 2469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return null; 2479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 2499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectclass PNGChunk { 2519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private byte[] mType; 2529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private byte[] mData; 2549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public PNGChunk(byte[] type, byte[] data) { 2569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mType = type; 2579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mData = data; 2589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public String getTypeString() { 2619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project try { 2629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return new String(mType, "UTF8"); 2639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } catch (UnsupportedEncodingException uee) { 2649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return ""; 2659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public byte[] getData() { 2699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mData; 2709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public long getUnsignedInt(int offset) { 2739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project long value = 0; 2749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < 4; i++) 2759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project value += (mData[offset + i] & 0xff) << ((3 - i) * 8); 2769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return value; 2779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public short getUnsignedByte(int offset) { 2809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (short) (mData[offset] & 0x00ff); 2819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project}