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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * published by the Free Software Foundation.  Oracle designates this
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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package com.sun.imageio.plugins.bmp;

import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Transparency;
import java.awt.color.ColorSpace;
import java.awt.color.ICC_ColorSpace;
import java.awt.color.ICC_Profile;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.ComponentColorModel;
import java.awt.image.ComponentSampleModel;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.awt.image.DataBufferInt;
import java.awt.image.DataBufferUShort;
import java.awt.image.DirectColorModel;
import java.awt.image.IndexColorModel;
import java.awt.image.MultiPixelPackedSampleModel;
import java.awt.image.PixelInterleavedSampleModel;
import java.awt.image.Raster;
import java.awt.image.SampleModel;
import java.awt.image.SinglePixelPackedSampleModel;
import java.awt.image.WritableRaster;

import javax.imageio.IIOException;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.spi.ImageReaderSpi;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.event.IIOReadProgressListener;
import javax.imageio.event.IIOReadUpdateListener;
import javax.imageio.event.IIOReadWarningListener;

import java.io.*;
import java.nio.*;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.StringTokenizer;

import com.sun.imageio.plugins.common.ImageUtil;
import com.sun.imageio.plugins.common.I18N;

This class is the Java Image IO plugin reader for BMP images. It may subsample the image, clip the image, select sub-bands, and shift the decoded image origin if the proper decoding parameter are set in the provided ImageReadParam. This class supports Microsoft Windows Bitmap Version 3-5, as well as OS/2 Bitmap Version 2.x (for single-image BMP file).
/** This class is the Java Image IO plugin reader for BMP images. * It may subsample the image, clip the image, select sub-bands, * and shift the decoded image origin if the proper decoding parameter * are set in the provided <code>ImageReadParam</code>. * * This class supports Microsoft Windows Bitmap Version 3-5, * as well as OS/2 Bitmap Version 2.x (for single-image BMP file). */
public class BMPImageReader extends ImageReader implements BMPConstants { // BMP Image types private static final int VERSION_2_1_BIT = 0; private static final int VERSION_2_4_BIT = 1; private static final int VERSION_2_8_BIT = 2; private static final int VERSION_2_24_BIT = 3; private static final int VERSION_3_1_BIT = 4; private static final int VERSION_3_4_BIT = 5; private static final int VERSION_3_8_BIT = 6; private static final int VERSION_3_24_BIT = 7; private static final int VERSION_3_NT_16_BIT = 8; private static final int VERSION_3_NT_32_BIT = 9; private static final int VERSION_4_1_BIT = 10; private static final int VERSION_4_4_BIT = 11; private static final int VERSION_4_8_BIT = 12; private static final int VERSION_4_16_BIT = 13; private static final int VERSION_4_24_BIT = 14; private static final int VERSION_4_32_BIT = 15; private static final int VERSION_3_XP_EMBEDDED = 16; private static final int VERSION_4_XP_EMBEDDED = 17; private static final int VERSION_5_XP_EMBEDDED = 18; // BMP variables private long bitmapFileSize; private long bitmapOffset; private long compression; private long imageSize; private byte palette[]; private int imageType; private int numBands; private boolean isBottomUp; private int bitsPerPixel; private int redMask, greenMask, blueMask, alphaMask; private SampleModel sampleModel, originalSampleModel; private ColorModel colorModel, originalColorModel;
The input stream where reads from
/** The input stream where reads from */
private ImageInputStream iis = null;
Indicates whether the header is read.
/** Indicates whether the header is read. */
private boolean gotHeader = false;
The original image width.
/** The original image width. */
private int width;
The original image height.
/** The original image height. */
private int height;
The destination region.
/** The destination region. */
private Rectangle destinationRegion;
The source region.
/** The source region. */
private Rectangle sourceRegion;
The metadata from the stream.
/** The metadata from the stream. */
private BMPMetadata metadata;
The destination image.
/** The destination image. */
private BufferedImage bi;
Indicates whether subsampled, subregion is required, and offset is defined
/** Indicates whether subsampled, subregion is required, and offset is * defined */
private boolean noTransform = true;
Indicates whether subband is selected.
/** Indicates whether subband is selected. */
private boolean seleBand = false;
The scaling factors.
/** The scaling factors. */
private int scaleX, scaleY;
source and destination bands.
/** source and destination bands. */
private int[] sourceBands, destBands;
Constructs BMPImageReader from the provided ImageReaderSpi.
/** Constructs <code>BMPImageReader</code> from the provided * <code>ImageReaderSpi</code>. */
public BMPImageReader(ImageReaderSpi originator) { super(originator); }
Overrides the method defined in the superclass.
/** Overrides the method defined in the superclass. */
public void setInput(Object input, boolean seekForwardOnly, boolean ignoreMetadata) { super.setInput(input, seekForwardOnly, ignoreMetadata); iis = (ImageInputStream) input; // Always works if(iis != null) iis.setByteOrder(ByteOrder.LITTLE_ENDIAN); resetHeaderInfo(); }
Overrides the method defined in the superclass.
/** Overrides the method defined in the superclass. */
public int getNumImages(boolean allowSearch) throws IOException { if (iis == null) { throw new IllegalStateException(I18N.getString("GetNumImages0")); } if (seekForwardOnly && allowSearch) { throw new IllegalStateException(I18N.getString("GetNumImages1")); } return 1; } @Override public int getWidth(int imageIndex) throws IOException { checkIndex(imageIndex); try { readHeader(); } catch (IllegalArgumentException e) { throw new IIOException(I18N.getString("BMPImageReader6"), e); } return width; } public int getHeight(int imageIndex) throws IOException { checkIndex(imageIndex); try { readHeader(); } catch (IllegalArgumentException e) { throw new IIOException(I18N.getString("BMPImageReader6"), e); } return height; } private void checkIndex(int imageIndex) { if (imageIndex != 0) { throw new IndexOutOfBoundsException(I18N.getString("BMPImageReader0")); } }
Process the image header.
Throws:
  • IllegalStateException – if source stream is not set.
  • IOException – if image stream is corrupted.
  • IllegalArgumentException – if the image stream does not contain a BMP image, or if a sample model instance to describe the image can not be created.
/** * Process the image header. * * @exception IllegalStateException if source stream is not set. * * @exception IOException if image stream is corrupted. * * @exception IllegalArgumentException if the image stream does not contain * a BMP image, or if a sample model instance to describe the * image can not be created. */
protected void readHeader() throws IOException, IllegalArgumentException { if (gotHeader) return; if (iis == null) { throw new IllegalStateException("Input source not set!"); } int profileData = 0, profileSize = 0; this.metadata = new BMPMetadata(); iis.mark(); // read and check the magic marker byte[] marker = new byte[2]; iis.read(marker); if (marker[0] != 0x42 || marker[1] != 0x4d) throw new IllegalArgumentException(I18N.getString("BMPImageReader1")); // Read file size bitmapFileSize = iis.readUnsignedInt(); // skip the two reserved fields iis.skipBytes(4); // Offset to the bitmap from the beginning bitmapOffset = iis.readUnsignedInt(); // End File Header // Start BitmapCoreHeader long size = iis.readUnsignedInt(); if (size == 12) { width = iis.readShort(); height = iis.readShort(); } else { width = iis.readInt(); height = iis.readInt(); } metadata.width = width; metadata.height = height; int planes = iis.readUnsignedShort(); bitsPerPixel = iis.readUnsignedShort(); //metadata.colorPlane = planes; metadata.bitsPerPixel = (short)bitsPerPixel; // As BMP always has 3 rgb bands, except for Version 5, // which is bgra numBands = 3; if (size == 12) { // Windows 2.x and OS/2 1.x metadata.bmpVersion = VERSION_2; // Classify the image type if (bitsPerPixel == 1) { imageType = VERSION_2_1_BIT; } else if (bitsPerPixel == 4) { imageType = VERSION_2_4_BIT; } else if (bitsPerPixel == 8) { imageType = VERSION_2_8_BIT; } else if (bitsPerPixel == 24) { imageType = VERSION_2_24_BIT; } // Read in the palette int numberOfEntries = (int)((bitmapOffset - 14 - size) / 3); int sizeOfPalette = numberOfEntries*3; palette = new byte[sizeOfPalette]; iis.readFully(palette, 0, sizeOfPalette); metadata.palette = palette; metadata.paletteSize = numberOfEntries; } else { compression = iis.readUnsignedInt(); imageSize = iis.readUnsignedInt(); long xPelsPerMeter = iis.readInt(); long yPelsPerMeter = iis.readInt(); long colorsUsed = iis.readUnsignedInt(); long colorsImportant = iis.readUnsignedInt(); metadata.compression = (int)compression; metadata.xPixelsPerMeter = (int)xPelsPerMeter; metadata.yPixelsPerMeter = (int)yPelsPerMeter; metadata.colorsUsed = (int)colorsUsed; metadata.colorsImportant = (int)colorsImportant; if (size == 40) { // Windows 3.x and Windows NT switch((int)compression) { case BI_JPEG: case BI_PNG: metadata.bmpVersion = VERSION_3; imageType = VERSION_3_XP_EMBEDDED; break; case BI_RGB: // No compression case BI_RLE8: // 8-bit RLE compression case BI_RLE4: // 4-bit RLE compression // Read in the palette if (bitmapOffset < (size + 14)) { throw new IIOException(I18N.getString("BMPImageReader7")); } int numberOfEntries = (int)((bitmapOffset-14-size) / 4); int sizeOfPalette = numberOfEntries * 4; palette = new byte[sizeOfPalette]; iis.readFully(palette, 0, sizeOfPalette); metadata.palette = palette; metadata.paletteSize = numberOfEntries; if (bitsPerPixel == 1) { imageType = VERSION_3_1_BIT; } else if (bitsPerPixel == 4) { imageType = VERSION_3_4_BIT; } else if (bitsPerPixel == 8) { imageType = VERSION_3_8_BIT; } else if (bitsPerPixel == 24) { imageType = VERSION_3_24_BIT; } else if (bitsPerPixel == 16) { imageType = VERSION_3_NT_16_BIT; redMask = 0x7C00; greenMask = 0x3E0; blueMask = (1 << 5) - 1;// 0x1F; metadata.redMask = redMask; metadata.greenMask = greenMask; metadata.blueMask = blueMask; } else if (bitsPerPixel == 32) { imageType = VERSION_3_NT_32_BIT; redMask = 0x00FF0000; greenMask = 0x0000FF00; blueMask = 0x000000FF; metadata.redMask = redMask; metadata.greenMask = greenMask; metadata.blueMask = blueMask; } metadata.bmpVersion = VERSION_3; break; case BI_BITFIELDS: if (bitsPerPixel == 16) { imageType = VERSION_3_NT_16_BIT; } else if (bitsPerPixel == 32) { imageType = VERSION_3_NT_32_BIT; } // BitsField encoding redMask = (int)iis.readUnsignedInt(); greenMask = (int)iis.readUnsignedInt(); blueMask = (int)iis.readUnsignedInt(); metadata.redMask = redMask; metadata.greenMask = greenMask; metadata.blueMask = blueMask; if (colorsUsed != 0) { // there is a palette sizeOfPalette = (int)colorsUsed*4; palette = new byte[sizeOfPalette]; iis.readFully(palette, 0, sizeOfPalette); metadata.palette = palette; metadata.paletteSize = (int)colorsUsed; } metadata.bmpVersion = VERSION_3_NT; break; default: throw new IIOException(I18N.getString("BMPImageReader2")); } } else if (size == 108 || size == 124) { // Windows 4.x BMP if (size == 108) metadata.bmpVersion = VERSION_4; else if (size == 124) metadata.bmpVersion = VERSION_5; // rgb masks, valid only if comp is BI_BITFIELDS redMask = (int)iis.readUnsignedInt(); greenMask = (int)iis.readUnsignedInt(); blueMask = (int)iis.readUnsignedInt(); // Only supported for 32bpp BI_RGB argb alphaMask = (int)iis.readUnsignedInt(); long csType = iis.readUnsignedInt(); int redX = iis.readInt(); int redY = iis.readInt(); int redZ = iis.readInt(); int greenX = iis.readInt(); int greenY = iis.readInt(); int greenZ = iis.readInt(); int blueX = iis.readInt(); int blueY = iis.readInt(); int blueZ = iis.readInt(); long gammaRed = iis.readUnsignedInt(); long gammaGreen = iis.readUnsignedInt(); long gammaBlue = iis.readUnsignedInt(); if (size == 124) { metadata.intent = iis.readInt(); profileData = iis.readInt(); profileSize = iis.readInt(); iis.skipBytes(4); } metadata.colorSpace = (int)csType; if (csType == LCS_CALIBRATED_RGB) { // All the new fields are valid only for this case metadata.redX = redX; metadata.redY = redY; metadata.redZ = redZ; metadata.greenX = greenX; metadata.greenY = greenY; metadata.greenZ = greenZ; metadata.blueX = blueX; metadata.blueY = blueY; metadata.blueZ = blueZ; metadata.gammaRed = (int)gammaRed; metadata.gammaGreen = (int)gammaGreen; metadata.gammaBlue = (int)gammaBlue; } // Read in the palette int numberOfEntries = (int)((bitmapOffset-14-size) / 4); int sizeOfPalette = numberOfEntries*4; palette = new byte[sizeOfPalette]; iis.readFully(palette, 0, sizeOfPalette); metadata.palette = palette; metadata.paletteSize = numberOfEntries; switch ((int)compression) { case BI_JPEG: case BI_PNG: if (size == 108) { imageType = VERSION_4_XP_EMBEDDED; } else if (size == 124) { imageType = VERSION_5_XP_EMBEDDED; } break; default: if (bitsPerPixel == 1) { imageType = VERSION_4_1_BIT; } else if (bitsPerPixel == 4) { imageType = VERSION_4_4_BIT; } else if (bitsPerPixel == 8) { imageType = VERSION_4_8_BIT; } else if (bitsPerPixel == 16) { imageType = VERSION_4_16_BIT; if ((int)compression == BI_RGB) { redMask = 0x7C00; greenMask = 0x3E0; blueMask = 0x1F; } } else if (bitsPerPixel == 24) { imageType = VERSION_4_24_BIT; } else if (bitsPerPixel == 32) { imageType = VERSION_4_32_BIT; if ((int)compression == BI_RGB) { redMask = 0x00FF0000; greenMask = 0x0000FF00; blueMask = 0x000000FF; } } metadata.redMask = redMask; metadata.greenMask = greenMask; metadata.blueMask = blueMask; metadata.alphaMask = alphaMask; } } else { throw new IIOException(I18N.getString("BMPImageReader3")); } } if (height > 0) { // bottom up image isBottomUp = true; } else { // top down image isBottomUp = false; height = Math.abs(height); } // Reset Image Layout so there's only one tile. //Define the color space ColorSpace colorSpace = ColorSpace.getInstance(ColorSpace.CS_sRGB); if (metadata.colorSpace == PROFILE_LINKED || metadata.colorSpace == PROFILE_EMBEDDED) { iis.mark(); iis.skipBytes(profileData - size); byte[] profile = new byte[profileSize]; iis.readFully(profile, 0, profileSize); iis.reset(); try { if (metadata.colorSpace == PROFILE_LINKED && isLinkedProfileAllowed() && !isUncOrDevicePath(profile)) { String path = new String(profile, "windows-1252"); colorSpace = new ICC_ColorSpace(ICC_Profile.getInstance(path)); } else { colorSpace = new ICC_ColorSpace(ICC_Profile.getInstance(profile)); } } catch (Exception e) { colorSpace = ColorSpace.getInstance(ColorSpace.CS_sRGB); } } if (bitsPerPixel == 0 || compression == BI_JPEG || compression == BI_PNG ) { // the colorModel and sampleModel will be initialzed // by the reader of embedded image colorModel = null; sampleModel = null; } else if (bitsPerPixel == 1 || bitsPerPixel == 4 || bitsPerPixel == 8) { // When number of bitsPerPixel is <= 8, we use IndexColorModel. numBands = 1; if (bitsPerPixel == 8) { int[] bandOffsets = new int[numBands]; for (int i = 0; i < numBands; i++) { bandOffsets[i] = numBands -1 -i; } sampleModel = new PixelInterleavedSampleModel(DataBuffer.TYPE_BYTE, width, height, numBands, numBands * width, bandOffsets); } else { // 1 and 4 bit pixels can be stored in a packed format. sampleModel = new MultiPixelPackedSampleModel(DataBuffer.TYPE_BYTE, width, height, bitsPerPixel); } // Create IndexColorModel from the palette. byte r[], g[], b[]; if (imageType == VERSION_2_1_BIT || imageType == VERSION_2_4_BIT || imageType == VERSION_2_8_BIT) { size = palette.length/3; if (size > 256) { size = 256; } int off; r = new byte[(int)size]; g = new byte[(int)size]; b = new byte[(int)size]; for (int i=0; i<(int)size; i++) { off = 3 * i; b[i] = palette[off]; g[i] = palette[off+1]; r[i] = palette[off+2]; } } else { size = palette.length/4; if (size > 256) { size = 256; } int off; r = new byte[(int)size]; g = new byte[(int)size]; b = new byte[(int)size]; for (int i=0; i<size; i++) { off = 4 * i; b[i] = palette[off]; g[i] = palette[off+1]; r[i] = palette[off+2]; } } if (ImageUtil.isIndicesForGrayscale(r, g, b)) colorModel = ImageUtil.createColorModel(null, sampleModel); else colorModel = new IndexColorModel(bitsPerPixel, (int)size, r, g, b); } else if (bitsPerPixel == 16) { numBands = 3; sampleModel = new SinglePixelPackedSampleModel(DataBuffer.TYPE_USHORT, width, height, new int[] {redMask, greenMask, blueMask}); colorModel = new DirectColorModel(colorSpace, 16, redMask, greenMask, blueMask, 0, false, DataBuffer.TYPE_USHORT); } else if (bitsPerPixel == 32) { numBands = alphaMask == 0 ? 3 : 4; // The number of bands in the SampleModel is determined by // the length of the mask array passed in. int[] bitMasks = numBands == 3 ? new int[] {redMask, greenMask, blueMask} : new int[] {redMask, greenMask, blueMask, alphaMask}; sampleModel = new SinglePixelPackedSampleModel(DataBuffer.TYPE_INT, width, height, bitMasks); colorModel = new DirectColorModel(colorSpace, 32, redMask, greenMask, blueMask, alphaMask, false, DataBuffer.TYPE_INT); } else { numBands = 3; // Create SampleModel int[] bandOffsets = new int[numBands]; for (int i = 0; i < numBands; i++) { bandOffsets[i] = numBands -1 -i; } sampleModel = new PixelInterleavedSampleModel(DataBuffer.TYPE_BYTE, width, height, numBands, numBands * width, bandOffsets); colorModel = ImageUtil.createColorModel(colorSpace, sampleModel); } originalSampleModel = sampleModel; originalColorModel = colorModel; // Reset to the start of bitmap; then jump to the //start of image data iis.reset(); iis.skipBytes(bitmapOffset); gotHeader = true; } public Iterator getImageTypes(int imageIndex) throws IOException { checkIndex(imageIndex); try { readHeader(); } catch (IllegalArgumentException e) { throw new IIOException(I18N.getString("BMPImageReader6"), e); } ArrayList list = new ArrayList(1); list.add(new ImageTypeSpecifier(originalColorModel, originalSampleModel)); return list.iterator(); } public ImageReadParam getDefaultReadParam() { return new ImageReadParam(); } public IIOMetadata getImageMetadata(int imageIndex) throws IOException { checkIndex(imageIndex); if (metadata == null) { try { readHeader(); } catch (IllegalArgumentException e) { throw new IIOException(I18N.getString("BMPImageReader6"), e); } } return metadata; } public IIOMetadata getStreamMetadata() throws IOException { return null; } public boolean isRandomAccessEasy(int imageIndex) throws IOException { checkIndex(imageIndex); try { readHeader(); } catch (IllegalArgumentException e) { throw new IIOException(I18N.getString("BMPImageReader6"), e); } return metadata.compression == BI_RGB; } public BufferedImage read(int imageIndex, ImageReadParam param) throws IOException { if (iis == null) { throw new IllegalStateException(I18N.getString("BMPImageReader5")); } checkIndex(imageIndex); clearAbortRequest(); processImageStarted(imageIndex); if (param == null) param = getDefaultReadParam(); //read header try { readHeader(); } catch (IllegalArgumentException e) { throw new IIOException(I18N.getString("BMPImageReader6"), e); } sourceRegion = new Rectangle(0, 0, 0, 0); destinationRegion = new Rectangle(0, 0, 0, 0); computeRegions(param, this.width, this.height, param.getDestination(), sourceRegion, destinationRegion); scaleX = param.getSourceXSubsampling(); scaleY = param.getSourceYSubsampling(); // If the destination band is set used it sourceBands = param.getSourceBands(); destBands = param.getDestinationBands(); seleBand = (sourceBands != null) && (destBands != null); noTransform = destinationRegion.equals(new Rectangle(0, 0, width, height)) || seleBand; if (!seleBand) { sourceBands = new int[numBands]; destBands = new int[numBands]; for (int i = 0; i < numBands; i++) destBands[i] = sourceBands[i] = i; } // If the destination is provided, then use it. Otherwise, create new one bi = param.getDestination(); // Get the image data. WritableRaster raster = null; if (bi == null) { if (sampleModel != null && colorModel != null) { sampleModel = sampleModel.createCompatibleSampleModel(destinationRegion.x + destinationRegion.width, destinationRegion.y + destinationRegion.height); if (seleBand) sampleModel = sampleModel.createSubsetSampleModel(sourceBands); raster = Raster.createWritableRaster(sampleModel, new Point()); bi = new BufferedImage(colorModel, raster, false, null); } } else { raster = bi.getWritableTile(0, 0); sampleModel = bi.getSampleModel(); colorModel = bi.getColorModel(); noTransform &= destinationRegion.equals(raster.getBounds()); } byte bdata[] = null; // buffer for byte data short sdata[] = null; // buffer for short data int idata[] = null; // buffer for int data // the sampleModel can be null in case of embedded image if (sampleModel != null) { if (sampleModel.getDataType() == DataBuffer.TYPE_BYTE) bdata = (byte[]) ((DataBufferByte)raster.getDataBuffer()).getData(); else if (sampleModel.getDataType() == DataBuffer.TYPE_USHORT) sdata = (short[]) ((DataBufferUShort)raster.getDataBuffer()).getData(); else if (sampleModel.getDataType() == DataBuffer.TYPE_INT) idata = (int[]) ((DataBufferInt)raster.getDataBuffer()).getData(); } // There should only be one tile. switch(imageType) { case VERSION_2_1_BIT: // no compression read1Bit(bdata); break; case VERSION_2_4_BIT: // no compression read4Bit(bdata); break; case VERSION_2_8_BIT: // no compression read8Bit(bdata); break; case VERSION_2_24_BIT: // no compression read24Bit(bdata); break; case VERSION_3_1_BIT: // 1-bit images cannot be compressed. read1Bit(bdata); break; case VERSION_3_4_BIT: switch((int)compression) { case BI_RGB: read4Bit(bdata); break; case BI_RLE4: readRLE4(bdata); break; default: throw new IIOException(I18N.getString("BMPImageReader1")); } break; case VERSION_3_8_BIT: switch((int)compression) { case BI_RGB: read8Bit(bdata); break; case BI_RLE8: readRLE8(bdata); break; default: throw new IIOException(I18N.getString("BMPImageReader1")); } break; case VERSION_3_24_BIT: // 24-bit images are not compressed read24Bit(bdata); break; case VERSION_3_NT_16_BIT: read16Bit(sdata); break; case VERSION_3_NT_32_BIT: read32Bit(idata); break; case VERSION_3_XP_EMBEDDED: case VERSION_4_XP_EMBEDDED: case VERSION_5_XP_EMBEDDED: bi = readEmbedded((int)compression, bi, param); break; case VERSION_4_1_BIT: read1Bit(bdata); break; case VERSION_4_4_BIT: switch((int)compression) { case BI_RGB: read4Bit(bdata); break; case BI_RLE4: readRLE4(bdata); break; default: throw new IIOException(I18N.getString("BMPImageReader1")); } break; case VERSION_4_8_BIT: switch((int)compression) { case BI_RGB: read8Bit(bdata); break; case BI_RLE8: readRLE8(bdata); break; default: throw new IIOException(I18N.getString("BMPImageReader1")); } break; case VERSION_4_16_BIT: read16Bit(sdata); break; case VERSION_4_24_BIT: read24Bit(bdata); break; case VERSION_4_32_BIT: read32Bit(idata); break; } if (abortRequested()) processReadAborted(); else processImageComplete(); return bi; } public boolean canReadRaster() { return true; } public Raster readRaster(int imageIndex, ImageReadParam param) throws IOException { BufferedImage bi = read(imageIndex, param); return bi.getData(); } private void resetHeaderInfo() { gotHeader = false; bi = null; sampleModel = originalSampleModel = null; colorModel = originalColorModel = null; } public void reset() { super.reset(); iis = null; resetHeaderInfo(); } // Deal with 1 Bit images using IndexColorModels private void read1Bit(byte[] bdata) throws IOException { int bytesPerScanline = (width + 7) / 8; int padding = bytesPerScanline % 4; if (padding != 0) { padding = 4 - padding; } int lineLength = bytesPerScanline + padding; if (noTransform) { int j = isBottomUp ? (height -1)*bytesPerScanline : 0; for (int i=0; i<height; i++) { if (abortRequested()) { break; } iis.readFully(bdata, j, bytesPerScanline); iis.skipBytes(padding); j += isBottomUp ? -bytesPerScanline : bytesPerScanline; processImageUpdate(bi, 0, i, destinationRegion.width, 1, 1, 1, new int[]{0}); processImageProgress(100.0F * i/destinationRegion.height); } } else { byte[] buf = new byte[lineLength]; int lineStride = ((MultiPixelPackedSampleModel)sampleModel).getScanlineStride(); if (isBottomUp) { int lastLine = sourceRegion.y + (destinationRegion.height - 1) * scaleY; iis.skipBytes(lineLength * (height - 1 - lastLine)); } else iis.skipBytes(lineLength * sourceRegion.y); int skipLength = lineLength * (scaleY - 1); // cache the values to avoid duplicated computation int[] srcOff = new int[destinationRegion.width]; int[] destOff = new int[destinationRegion.width]; int[] srcPos = new int[destinationRegion.width]; int[] destPos = new int[destinationRegion.width]; for (int i = destinationRegion.x, x = sourceRegion.x, j = 0; i < destinationRegion.x + destinationRegion.width; i++, j++, x += scaleX) { srcPos[j] = x >> 3; srcOff[j] = 7 - (x & 7); destPos[j] = i >> 3; destOff[j] = 7 - (i & 7); } int k = destinationRegion.y * lineStride; if (isBottomUp) k += (destinationRegion.height - 1) * lineStride; for (int j = 0, y = sourceRegion.y; j < destinationRegion.height; j++, y+=scaleY) { if (abortRequested()) break; iis.read(buf, 0, lineLength); for (int i = 0; i < destinationRegion.width; i++) { //get the bit and assign to the data buffer of the raster int v = (buf[srcPos[i]] >> srcOff[i]) & 1; bdata[k + destPos[i]] |= v << destOff[i]; } k += isBottomUp ? -lineStride : lineStride; iis.skipBytes(skipLength); processImageUpdate(bi, 0, j, destinationRegion.width, 1, 1, 1, new int[]{0}); processImageProgress(100.0F*j/destinationRegion.height); } } } // Method to read a 4 bit BMP image data private void read4Bit(byte[] bdata) throws IOException { int bytesPerScanline = (width + 1) / 2; // Padding bytes at the end of each scanline int padding = bytesPerScanline % 4; if (padding != 0) padding = 4 - padding; int lineLength = bytesPerScanline + padding; if (noTransform) { int j = isBottomUp ? (height -1) * bytesPerScanline : 0; for (int i=0; i<height; i++) { if (abortRequested()) { break; } iis.readFully(bdata, j, bytesPerScanline); iis.skipBytes(padding); j += isBottomUp ? -bytesPerScanline : bytesPerScanline; processImageUpdate(bi, 0, i, destinationRegion.width, 1, 1, 1, new int[]{0}); processImageProgress(100.0F * i/destinationRegion.height); } } else { byte[] buf = new byte[lineLength]; int lineStride = ((MultiPixelPackedSampleModel)sampleModel).getScanlineStride(); if (isBottomUp) { int lastLine = sourceRegion.y + (destinationRegion.height - 1) * scaleY; iis.skipBytes(lineLength * (height - 1 - lastLine)); } else iis.skipBytes(lineLength * sourceRegion.y); int skipLength = lineLength * (scaleY - 1); // cache the values to avoid duplicated computation int[] srcOff = new int[destinationRegion.width]; int[] destOff = new int[destinationRegion.width]; int[] srcPos = new int[destinationRegion.width]; int[] destPos = new int[destinationRegion.width]; for (int i = destinationRegion.x, x = sourceRegion.x, j = 0; i < destinationRegion.x + destinationRegion.width; i++, j++, x += scaleX) { srcPos[j] = x >> 1; srcOff[j] = (1 - (x & 1)) << 2; destPos[j] = i >> 1; destOff[j] = (1 - (i & 1)) << 2; } int k = destinationRegion.y * lineStride; if (isBottomUp) k += (destinationRegion.height - 1) * lineStride; for (int j = 0, y = sourceRegion.y; j < destinationRegion.height; j++, y+=scaleY) { if (abortRequested()) break; iis.read(buf, 0, lineLength); for (int i = 0; i < destinationRegion.width; i++) { //get the bit and assign to the data buffer of the raster int v = (buf[srcPos[i]] >> srcOff[i]) & 0x0F; bdata[k + destPos[i]] |= v << destOff[i]; } k += isBottomUp ? -lineStride : lineStride; iis.skipBytes(skipLength); processImageUpdate(bi, 0, j, destinationRegion.width, 1, 1, 1, new int[]{0}); processImageProgress(100.0F*j/destinationRegion.height); } } } // Method to read 8 bit BMP image data private void read8Bit(byte[] bdata) throws IOException { // Padding bytes at the end of each scanline int padding = width % 4; if (padding != 0) { padding = 4 - padding; } int lineLength = width + padding; if (noTransform) { int j = isBottomUp ? (height -1) * width : 0; for (int i=0; i<height; i++) { if (abortRequested()) { break; } iis.readFully(bdata, j, width); iis.skipBytes(padding); j += isBottomUp ? -width : width; processImageUpdate(bi, 0, i, destinationRegion.width, 1, 1, 1, new int[]{0}); processImageProgress(100.0F * i/destinationRegion.height); } } else { byte[] buf = new byte[lineLength]; int lineStride = ((ComponentSampleModel)sampleModel).getScanlineStride(); if (isBottomUp) { int lastLine = sourceRegion.y + (destinationRegion.height - 1) * scaleY; iis.skipBytes(lineLength * (height - 1 - lastLine)); } else iis.skipBytes(lineLength * sourceRegion.y); int skipLength = lineLength * (scaleY - 1); int k = destinationRegion.y * lineStride; if (isBottomUp) k += (destinationRegion.height - 1) * lineStride; k += destinationRegion.x; for (int j = 0, y = sourceRegion.y; j < destinationRegion.height; j++, y+=scaleY) { if (abortRequested()) break; iis.read(buf, 0, lineLength); for (int i = 0, m = sourceRegion.x; i < destinationRegion.width; i++, m += scaleX) { //get the bit and assign to the data buffer of the raster bdata[k + i] = buf[m]; } k += isBottomUp ? -lineStride : lineStride; iis.skipBytes(skipLength); processImageUpdate(bi, 0, j, destinationRegion.width, 1, 1, 1, new int[]{0}); processImageProgress(100.0F*j/destinationRegion.height); } } } // Method to read 24 bit BMP image data private void read24Bit(byte[] bdata) throws IOException { // Padding bytes at the end of each scanline // width * bitsPerPixel should be divisible by 32 int padding = width * 3 % 4; if ( padding != 0) padding = 4 - padding; int lineStride = width * 3; int lineLength = lineStride + padding; if (noTransform) { int j = isBottomUp ? (height -1) * width * 3 : 0; for (int i=0; i<height; i++) { if (abortRequested()) { break; } iis.readFully(bdata, j, lineStride); iis.skipBytes(padding); j += isBottomUp ? -lineStride : lineStride; processImageUpdate(bi, 0, i, destinationRegion.width, 1, 1, 1, new int[]{0}); processImageProgress(100.0F * i/destinationRegion.height); } } else { byte[] buf = new byte[lineLength]; lineStride = ((ComponentSampleModel)sampleModel).getScanlineStride(); if (isBottomUp) { int lastLine = sourceRegion.y + (destinationRegion.height - 1) * scaleY; iis.skipBytes(lineLength * (height - 1 - lastLine)); } else iis.skipBytes(lineLength * sourceRegion.y); int skipLength = lineLength * (scaleY - 1); int k = destinationRegion.y * lineStride; if (isBottomUp) k += (destinationRegion.height - 1) * lineStride; k += destinationRegion.x * 3; for (int j = 0, y = sourceRegion.y; j < destinationRegion.height; j++, y+=scaleY) { if (abortRequested()) break; iis.read(buf, 0, lineLength); for (int i = 0, m = 3 * sourceRegion.x; i < destinationRegion.width; i++, m += 3 * scaleX) { //get the bit and assign to the data buffer of the raster int n = 3 * i + k; for (int b = 0; b < destBands.length; b++) bdata[n + destBands[b]] = buf[m + sourceBands[b]]; } k += isBottomUp ? -lineStride : lineStride; iis.skipBytes(skipLength); processImageUpdate(bi, 0, j, destinationRegion.width, 1, 1, 1, new int[]{0}); processImageProgress(100.0F*j/destinationRegion.height); } } } private void read16Bit(short sdata[]) throws IOException { // Padding bytes at the end of each scanline // width * bitsPerPixel should be divisible by 32 int padding = width * 2 % 4; if ( padding != 0) padding = 4 - padding; int lineLength = width + padding / 2; if (noTransform) { int j = isBottomUp ? (height -1) * width : 0; for (int i=0; i<height; i++) { if (abortRequested()) { break; } iis.readFully(sdata, j, width); iis.skipBytes(padding); j += isBottomUp ? -width : width; processImageUpdate(bi, 0, i, destinationRegion.width, 1, 1, 1, new int[]{0}); processImageProgress(100.0F * i/destinationRegion.height); } } else { short[] buf = new short[lineLength]; int lineStride = ((SinglePixelPackedSampleModel)sampleModel).getScanlineStride(); if (isBottomUp) { int lastLine = sourceRegion.y + (destinationRegion.height - 1) * scaleY; iis.skipBytes(lineLength * (height - 1 - lastLine) << 1); } else iis.skipBytes(lineLength * sourceRegion.y << 1); int skipLength = lineLength * (scaleY - 1) << 1; int k = destinationRegion.y * lineStride; if (isBottomUp) k += (destinationRegion.height - 1) * lineStride; k += destinationRegion.x; for (int j = 0, y = sourceRegion.y; j < destinationRegion.height; j++, y+=scaleY) { if (abortRequested()) break; iis.readFully(buf, 0, lineLength); for (int i = 0, m = sourceRegion.x; i < destinationRegion.width; i++, m += scaleX) { //get the bit and assign to the data buffer of the raster sdata[k + i] = buf[m]; } k += isBottomUp ? -lineStride : lineStride; iis.skipBytes(skipLength); processImageUpdate(bi, 0, j, destinationRegion.width, 1, 1, 1, new int[]{0}); processImageProgress(100.0F*j/destinationRegion.height); } } } private void read32Bit(int idata[]) throws IOException { if (noTransform) { int j = isBottomUp ? (height -1) * width : 0; for (int i=0; i<height; i++) { if (abortRequested()) { break; } iis.readFully(idata, j, width); j += isBottomUp ? -width : width; processImageUpdate(bi, 0, i, destinationRegion.width, 1, 1, 1, new int[]{0}); processImageProgress(100.0F * i/destinationRegion.height); } } else { int[] buf = new int[width]; int lineStride = ((SinglePixelPackedSampleModel)sampleModel).getScanlineStride(); if (isBottomUp) { int lastLine = sourceRegion.y + (destinationRegion.height - 1) * scaleY; iis.skipBytes(width * (height - 1 - lastLine) << 2); } else iis.skipBytes(width * sourceRegion.y << 2); int skipLength = width * (scaleY - 1) << 2; int k = destinationRegion.y * lineStride; if (isBottomUp) k += (destinationRegion.height - 1) * lineStride; k += destinationRegion.x; for (int j = 0, y = sourceRegion.y; j < destinationRegion.height; j++, y+=scaleY) { if (abortRequested()) break; iis.readFully(buf, 0, width); for (int i = 0, m = sourceRegion.x; i < destinationRegion.width; i++, m += scaleX) { //get the bit and assign to the data buffer of the raster idata[k + i] = buf[m]; } k += isBottomUp ? -lineStride : lineStride; iis.skipBytes(skipLength); processImageUpdate(bi, 0, j, destinationRegion.width, 1, 1, 1, new int[]{0}); processImageProgress(100.0F*j/destinationRegion.height); } } } private void readRLE8(byte bdata[]) throws IOException { // If imageSize field is not provided, calculate it. int imSize = (int)imageSize; if (imSize == 0) { imSize = (int)(bitmapFileSize - bitmapOffset); } int padding = 0; // If width is not 32 bit aligned, then while uncompressing each // scanline will have padding bytes, calculate the amount of padding int remainder = width % 4; if (remainder != 0) { padding = 4 - remainder; } // Read till we have the whole image byte values[] = new byte[imSize]; int bytesRead = 0; iis.readFully(values, 0, imSize); // Since data is compressed, decompress it decodeRLE8(imSize, padding, values, bdata); } private void decodeRLE8(int imSize, int padding, byte[] values, byte[] bdata) throws IOException { byte val[] = new byte[width * height]; int count = 0, l = 0; int value; boolean flag = false; int lineNo = isBottomUp ? height - 1 : 0; int lineStride = ((ComponentSampleModel)sampleModel).getScanlineStride(); int finished = 0; while (count != imSize) { value = values[count++] & 0xff; if (value == 0) { switch(values[count++] & 0xff) { case 0: // End-of-scanline marker if (lineNo >= sourceRegion.y && lineNo < sourceRegion.y + sourceRegion.height) { if (noTransform) { int pos = lineNo * width; for(int i = 0; i < width; i++) bdata[pos++] = val[i]; processImageUpdate(bi, 0, lineNo, destinationRegion.width, 1, 1, 1, new int[]{0}); finished++; } else if ((lineNo - sourceRegion.y) % scaleY == 0) { int currentLine = (lineNo - sourceRegion.y) / scaleY + destinationRegion.y; int pos = currentLine * lineStride; pos += destinationRegion.x; for (int i = sourceRegion.x; i < sourceRegion.x + sourceRegion.width; i += scaleX) bdata[pos++] = val[i]; processImageUpdate(bi, 0, currentLine, destinationRegion.width, 1, 1, 1, new int[]{0}); finished++; } } processImageProgress(100.0F * finished / destinationRegion.height); lineNo += isBottomUp ? -1 : 1; l = 0; if (abortRequested()) { flag = true; } break; case 1: // End-of-RLE marker flag = true; break; case 2: // delta or vector marker int xoff = values[count++] & 0xff; int yoff = values[count] & 0xff; // Move to the position xoff, yoff down l += xoff + yoff*width; break; default: int end = values[count-1] & 0xff; for (int i=0; i<end; i++) { val[l++] = (byte)(values[count++] & 0xff); } // Whenever end pixels can fit into odd number of bytes, // an extra padding byte will be present, so skip that. if ((end & 1) == 1) { count++; } } } else { for (int i=0; i<value; i++) { val[l++] = (byte)(values[count] & 0xff); } count++; } // If End-of-RLE data, then exit the while loop if (flag) { break; } } } private void readRLE4(byte[] bdata) throws IOException { // If imageSize field is not specified, calculate it. int imSize = (int)imageSize; if (imSize == 0) { imSize = (int)(bitmapFileSize - bitmapOffset); } int padding = 0; // If width is not 32 byte aligned, then while uncompressing each // scanline will have padding bytes, calculate the amount of padding int remainder = width % 4; if (remainder != 0) { padding = 4 - remainder; } // Read till we have the whole image byte[] values = new byte[imSize]; iis.readFully(values, 0, imSize); // Decompress the RLE4 compressed data. decodeRLE4(imSize, padding, values, bdata); } private void decodeRLE4(int imSize, int padding, byte[] values, byte[] bdata) throws IOException { byte[] val = new byte[width]; int count = 0, l = 0; int value; boolean flag = false; int lineNo = isBottomUp ? height - 1 : 0; int lineStride = ((MultiPixelPackedSampleModel)sampleModel).getScanlineStride(); int finished = 0; while (count != imSize) { value = values[count++] & 0xFF; if (value == 0) { // Absolute mode switch(values[count++] & 0xFF) { case 0: // End-of-scanline marker // End-of-scanline marker if (lineNo >= sourceRegion.y && lineNo < sourceRegion.y + sourceRegion.height) { if (noTransform) { int pos = lineNo * (width + 1 >> 1); for(int i = 0, j = 0; i < width >> 1; i++) bdata[pos++] = (byte)((val[j++] << 4) | val[j++]); if ((width & 1) == 1) bdata[pos] |= val[width - 1] << 4; processImageUpdate(bi, 0, lineNo, destinationRegion.width, 1, 1, 1, new int[]{0}); finished++; } else if ((lineNo - sourceRegion.y) % scaleY == 0) { int currentLine = (lineNo - sourceRegion.y) / scaleY + destinationRegion.y; int pos = currentLine * lineStride; pos += destinationRegion.x >> 1; int shift = (1 - (destinationRegion.x & 1)) << 2; for (int i = sourceRegion.x; i < sourceRegion.x + sourceRegion.width; i += scaleX) { bdata[pos] |= val[i] << shift; shift += 4; if (shift == 4) { pos++; } shift &= 7; } processImageUpdate(bi, 0, currentLine, destinationRegion.width, 1, 1, 1, new int[]{0}); finished++; } } processImageProgress(100.0F * finished / destinationRegion.height); lineNo += isBottomUp ? -1 : 1; l = 0; if (abortRequested()) { flag = true; } break; case 1: // End-of-RLE marker flag = true; break; case 2: // delta or vector marker int xoff = values[count++] & 0xFF; int yoff = values[count] & 0xFF; // Move to the position xoff, yoff down l += xoff + yoff*width; break; default: int end = values[count-1] & 0xFF; for (int i=0; i<end; i++) { val[l++] = (byte)(((i & 1) == 0) ? (values[count] & 0xf0) >> 4 : (values[count++] & 0x0f)); } // When end is odd, the above for loop does not // increment count, so do it now. if ((end & 1) == 1) { count++; } // Whenever end pixels can fit into odd number of bytes, // an extra padding byte will be present, so skip that. if ((((int)Math.ceil(end/2)) & 1) ==1 ) { count++; } break; } } else { // Encoded mode int alternate[] = { (values[count] & 0xf0) >> 4, values[count] & 0x0f }; for (int i=0; (i < value) && (l < width); i++) { val[l++] = (byte)alternate[i & 1]; } count++; } // If End-of-RLE data, then exit the while loop if (flag) { break; } } }
Decodes the jpeg/png image embedded in the bitmap using any jpeg ImageIO-style plugin.
Params:
  • bi – The destination BufferedImage.
  • bmpParam – The ImageReadParam for decoding this BMP image. The parameters for subregion, band selection and subsampling are used in decoding the jpeg image.
/** Decodes the jpeg/png image embedded in the bitmap using any jpeg * ImageIO-style plugin. * * @param bi The destination <code>BufferedImage</code>. * @param bmpParam The <code>ImageReadParam</code> for decoding this * BMP image. The parameters for subregion, band selection and * subsampling are used in decoding the jpeg image. */
private BufferedImage readEmbedded(int type, BufferedImage bi, ImageReadParam bmpParam) throws IOException { String format; switch(type) { case BI_JPEG: format = "JPEG"; break; case BI_PNG: format = "PNG"; break; default: throw new IOException("Unexpected compression type: " + type); } ImageReader reader = ImageIO.getImageReadersByFormatName(format).next(); if (reader == null) { throw new RuntimeException(I18N.getString("BMPImageReader4") + " " + format); } // prepare input byte[] buff = new byte[(int)imageSize]; iis.read(buff); reader.setInput(ImageIO.createImageInputStream(new ByteArrayInputStream(buff))); if (bi == null) { ImageTypeSpecifier embType = reader.getImageTypes(0).next(); bi = embType.createBufferedImage(destinationRegion.x + destinationRegion.width, destinationRegion.y + destinationRegion.height); } reader.addIIOReadProgressListener(new EmbeddedProgressAdapter() { public void imageProgress(ImageReader source, float percentageDone) { processImageProgress(percentageDone); } }); reader.addIIOReadUpdateListener(new IIOReadUpdateListener() { public void imageUpdate(ImageReader source, BufferedImage theImage, int minX, int minY, int width, int height, int periodX, int periodY, int[] bands) { processImageUpdate(theImage, minX, minY, width, height, periodX, periodY, bands); } public void passComplete(ImageReader source, BufferedImage theImage) { processPassComplete(theImage); } public void passStarted(ImageReader source, BufferedImage theImage, int pass, int minPass, int maxPass, int minX, int minY, int periodX, int periodY, int[] bands) { processPassStarted(theImage, pass, minPass, maxPass, minX, minY, periodX, periodY, bands); } public void thumbnailPassComplete(ImageReader source, BufferedImage thumb) {} public void thumbnailPassStarted(ImageReader source, BufferedImage thumb, int pass, int minPass, int maxPass, int minX, int minY, int periodX, int periodY, int[] bands) {} public void thumbnailUpdate(ImageReader source, BufferedImage theThumbnail, int minX, int minY, int width, int height, int periodX, int periodY, int[] bands) {} }); reader.addIIOReadWarningListener(new IIOReadWarningListener() { public void warningOccurred(ImageReader source, String warning) { processWarningOccurred(warning); } }); ImageReadParam param = reader.getDefaultReadParam(); param.setDestination(bi); param.setDestinationBands(bmpParam.getDestinationBands()); param.setDestinationOffset(bmpParam.getDestinationOffset()); param.setSourceBands(bmpParam.getSourceBands()); param.setSourceRegion(bmpParam.getSourceRegion()); param.setSourceSubsampling(bmpParam.getSourceXSubsampling(), bmpParam.getSourceYSubsampling(), bmpParam.getSubsamplingXOffset(), bmpParam.getSubsamplingYOffset()); reader.read(0, param); return bi; } private class EmbeddedProgressAdapter implements IIOReadProgressListener { public void imageComplete(ImageReader src) {} public void imageProgress(ImageReader src, float percentageDone) {} public void imageStarted(ImageReader src, int imageIndex) {} public void thumbnailComplete(ImageReader src) {} public void thumbnailProgress(ImageReader src, float percentageDone) {} public void thumbnailStarted(ImageReader src, int iIdx, int tIdx) {} public void sequenceComplete(ImageReader src) {} public void sequenceStarted(ImageReader src, int minIndex) {} public void readAborted(ImageReader src) {} } private static Boolean isLinkedProfileDisabled = null; private static boolean isLinkedProfileAllowed() { if (isLinkedProfileDisabled == null) { PrivilegedAction<Boolean> a = new PrivilegedAction<Boolean>() { public Boolean run() { return Boolean.getBoolean("sun.imageio.plugins.bmp.disableLinkedProfiles"); } }; isLinkedProfileDisabled = AccessController.doPrivileged(a); } return !isLinkedProfileDisabled; } private static Boolean isWindowsPlatform = null;
Verifies whether the byte array contans a unc path. Non-UNC path examples: c:\path\to\file - simple notation \\?\c:\path\to\file - long notation UNC path examples: \\server\share - a UNC path in simple notation \\?\UNC\server\share - a UNC path in long notation \\.\some\device - a path to device.
/** * Verifies whether the byte array contans a unc path. * Non-UNC path examples: * c:\path\to\file - simple notation * \\?\c:\path\to\file - long notation * * UNC path examples: * \\server\share - a UNC path in simple notation * \\?\UNC\server\share - a UNC path in long notation * \\.\some\device - a path to device. */
private static boolean isUncOrDevicePath(byte[] p) { if (isWindowsPlatform == null) { PrivilegedAction<Boolean> a = new PrivilegedAction<Boolean>() { public Boolean run() { String osname = System.getProperty("os.name"); return (osname != null && osname.toLowerCase().startsWith("win")); } }; isWindowsPlatform = AccessController.doPrivileged(a); } if (!isWindowsPlatform) { /* no need for the check on platforms except windows */ return false; } /* normalize prefix of the path */ if (p[0] == '/') p[0] = '\\'; if (p[1] == '/') p[1] = '\\'; if (p[3] == '/') p[3] = '\\'; if ((p[0] == '\\') && (p[1] == '\\')) { if ((p[2] == '?') && (p[3] == '\\')) { // long path: whether unc or local return ((p[4] == 'U' || p[4] == 'u') && (p[5] == 'N' || p[5] == 'n') && (p[6] == 'C' || p[6] == 'c')); } else { // device path or short unc notation return true; } } else { return false; } } }