?? fileformat.java
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/******************************************************************************* * Copyright (c) 2000, 2003 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Common Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/cpl-v10.html * * Contributors: * IBM Corporation - initial API and implementation *******************************************************************************/package org.eclipse.swt.internal.image;import java.io.*;import org.eclipse.swt.*;import org.eclipse.swt.graphics.*;public abstract class FileFormat { static final String FORMAT_PACKAGE = "org.eclipse.swt.internal.image"; //$NON-NLS-1$ static final String FORMAT_SUFFIX = "FileFormat"; //$NON-NLS-1$ static final String[] FORMATS = {"WinBMP", "WinBMP", "GIF", "WinICO", "JPEG", "PNG", "TIFF"}; //$NON-NLS-1$//$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$//$NON-NLS-5$ //$NON-NLS-6$//$NON-NLS-7$ LEDataInputStream inputStream; LEDataOutputStream outputStream; ImageLoader loader; int compression;byte[] bitInvertData(byte[] data, int startIndex, int endIndex) { // Destructively bit invert data in the given byte array. for (int i = startIndex; i < endIndex; i++) { data[i] = (byte)(255 - data[i - startIndex]); } return data;}/** * Return whether or not the specified input stream * represents a supported file format. */abstract boolean isFileFormat(LEDataInputStream stream);abstract ImageData[] loadFromByteStream();public ImageData[] loadFromStream(LEDataInputStream stream) { try { inputStream = stream; return loadFromByteStream(); } catch (Exception e) { SWT.error(SWT.ERROR_IO, e); return null; }}public static ImageData[] load(InputStream is, ImageLoader loader) { FileFormat fileFormat = null; LEDataInputStream stream = new LEDataInputStream(is); boolean isSupported = false; for (int i = 1; i < FORMATS.length; i++) { if (FORMATS[i] != null) { try { Class clazz = Class.forName(FORMAT_PACKAGE + '.' + FORMATS[i] + FORMAT_SUFFIX); fileFormat = (FileFormat) clazz.newInstance(); if (fileFormat.isFileFormat(stream)) { isSupported = true; break; } } catch (ClassNotFoundException e) { FORMATS[i] = null; } catch (Exception e) { } } } if (!isSupported) SWT.error(SWT.ERROR_UNSUPPORTED_FORMAT); fileFormat.loader = loader; return fileFormat.loadFromStream(stream);}public static void save(OutputStream os, int format, ImageLoader loader) { if (format < 0 || format >= FORMATS.length) SWT.error(SWT.ERROR_INVALID_ARGUMENT); if (FORMATS[format] == null) SWT.error(SWT.ERROR_INVALID_ARGUMENT); /* We do not currently support writing multi-image files, * so we use the first image data in the loader's array. */ ImageData data = loader.data[0]; LEDataOutputStream stream = new LEDataOutputStream(os); FileFormat fileFormat = null; try { Class clazz = Class.forName(FORMAT_PACKAGE + '.' + FORMATS[format] + FORMAT_SUFFIX); fileFormat = (FileFormat) clazz.newInstance(); } catch (Exception e) { SWT.error(SWT.ERROR_INVALID_ARGUMENT); } if (format == SWT.IMAGE_BMP_RLE) { switch (data.depth) { case 8: fileFormat.compression = 1; break; case 4: fileFormat.compression = 2; break; } } fileFormat.unloadIntoStream(data, stream);}abstract void unloadIntoByteStream(ImageData image);public void unloadIntoStream(ImageData image, LEDataOutputStream stream) { try { outputStream = stream; unloadIntoByteStream(image); outputStream.close(); } catch (Exception e) { try {outputStream.close();} catch (Exception f) {} SWT.error(SWT.ERROR_IO, e); }}}
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