bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/HTMLTransfer.java - platform/eclipse.platform.swt - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2017 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
  * which accompanies this distribution, and is available at
  * https://www.eclipse.org/legal/epl-2.0/
  *
  * SPDX-License-Identifier: EPL-2.0
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.swt.dnd;

 import org.eclipse.swt.internal.*;
 import org.eclipse.swt.internal.ole.win32.*;
 import org.eclipse.swt.internal.win32.*;

 /**
  * The class <code>HTMLTransfer</code> provides a platform specific mechanism
  * for converting text in HTML format represented as a java <code>String</code>
  * to a platform specific representation of the data and vice versa.
  *
  * <p>An example of a java <code>String</code> containing HTML text is shown
  * below:</p>
  *
  * <pre><code>
  *     String htmlData = "&lt;p&gt;This is a paragraph of text.&lt;/p&gt;";
  * </code></pre>
  *
  * @see Transfer
  */
 public class HTMLTransfer extends ByteArrayTransfer {

 	static HTMLTransfer _instance = new HTMLTransfer();
 	static final String HTML_FORMAT = "HTML Format"; //$NON-NLS-1$
 	static final int HTML_FORMATID = registerType(HTML_FORMAT);
 	static final String NUMBER = "00000000"; //$NON-NLS-1$
 	static final String HEADER = "Version:0.9\r\nStartHTML:"+NUMBER+"\r\nEndHTML:"+NUMBER+"\r\nStartFragment:"+NUMBER+"\r\nEndFragment:"+NUMBER+"\r\n";
 	static final String PREFIX = "<html><body><!--StartFragment-->"; //$NON-NLS-1$
 	static final String SUFFIX = "<!--EndFragment--></body></html>"; //$NON-NLS-1$
 	static final String StartFragment = "StartFragment:"; //$NON-NLS-1$
 	static final String EndFragment = "EndFragment:"; //$NON-NLS-1$

 private HTMLTransfer() {}

 /**
  * Returns the singleton instance of the HTMLTransfer class.
  *
  * @return the singleton instance of the HTMLTransfer class
  */
 public static HTMLTransfer getInstance () {
 	return _instance;
 }

 /**
  * This implementation of <code>javaToNative</code> converts HTML-formatted text
  * represented by a java <code>String</code> to a platform specific representation.
  *
  * @param object a java <code>String</code> containing HTML text
  * @param transferData an empty <code>TransferData</code> object that will
  *  	be filled in on return with the platform specific format of the data
  *
  * @see Transfer#nativeToJava
  */
 @Override
 public void javaToNative (Object object, TransferData transferData){
 	if (!checkHTML(object) || !isSupportedType(transferData)) {
 		DND.error(DND.ERROR_INVALID_DATA);
 	}
 	String string = (String)object;
 	int count = string.length();
 	char[] chars = new char[count + 1];
 	string.getChars(0, count, chars, 0);
 	/* NOTE: CF_HTML uses UTF-8 encoding. */
 	int cchMultiByte = OS.WideCharToMultiByte(OS.CP_UTF8, 0, chars, -1, null, 0, null, null);
 	if (cchMultiByte == 0) {
 		transferData.stgmedium = new STGMEDIUM();
 		transferData.result = COM.DV_E_STGMEDIUM;
 		return;
 	}
 	int startHTML = HEADER.length();
 	int startFragment = startHTML + PREFIX.length();
 	int endFragment = startFragment + cchMultiByte - 1;
 	int endHTML = endFragment + SUFFIX.length();

 	StringBuilder buffer = new StringBuilder(HEADER);
 	int maxLength = NUMBER.length();
 	//startHTML
 	int start = buffer.toString().indexOf(NUMBER);
 	String temp = Integer.toString(startHTML);
 	buffer.replace(start + maxLength-temp.length(), start + maxLength, temp);
 	//endHTML
 	start = buffer.toString().indexOf(NUMBER, start);
 	temp = Integer.toString(endHTML);
 	buffer.replace(start + maxLength-temp.length(), start + maxLength, temp);
 	//startFragment
 	start = buffer.toString().indexOf(NUMBER, start);
 	temp = Integer.toString(startFragment);
 	buffer.replace(start + maxLength-temp.length(), start + maxLength, temp);
 	//endFragment
 	start = buffer.toString().indexOf(NUMBER, start);
 	temp = Integer.toString(endFragment);
 	buffer.replace(start + maxLength-temp.length(), start + maxLength, temp);

 	buffer.append(PREFIX);
 	buffer.append(string);
 	buffer.append(SUFFIX);

 	count = buffer.length();
 	chars = new char[count + 1];
 	buffer.getChars(0, count, chars, 0);
 	cchMultiByte = OS.WideCharToMultiByte(OS.CP_UTF8, 0, chars, -1, null, 0, null, null);
 	long lpMultiByteStr = OS.GlobalAlloc(OS.GMEM_FIXED | OS.GMEM_ZEROINIT, cchMultiByte);
 	OS.WideCharToMultiByte(OS.CP_UTF8, 0, chars, -1, lpMultiByteStr, cchMultiByte, null, null);
 	transferData.stgmedium = new STGMEDIUM();
 	transferData.stgmedium.tymed = COM.TYMED_HGLOBAL;
 	transferData.stgmedium.unionField = lpMultiByteStr;
 	transferData.stgmedium.pUnkForRelease = 0;
 	transferData.result = COM.S_OK;
 	return;
 }

 /**
  * This implementation of <code>nativeToJava</code> converts a platform specific
  * representation of HTML text to a java <code>String</code>.
  *
  * @param transferData the platform specific representation of the data to be converted
  * @return a java <code>String</code> containing HTML text if the conversion was successful;
  * 		otherwise null
  *
  * @see Transfer#javaToNative
  */
 @Override
 public Object nativeToJava(TransferData transferData){
 	if (!isSupportedType(transferData) || transferData.pIDataObject == 0) return null;
 	IDataObject data = new IDataObject(transferData.pIDataObject);
 	data.AddRef();
 	STGMEDIUM stgmedium = new STGMEDIUM();
 	FORMATETC formatetc = transferData.formatetc;
 	stgmedium.tymed = COM.TYMED_HGLOBAL;
 	transferData.result = getData(data, formatetc, stgmedium);
 	data.Release();
 	if (transferData.result != COM.S_OK) return null;
 	long hMem = stgmedium.unionField;

 	try {
 		long lpMultiByteStr = OS.GlobalLock(hMem);
 		if (lpMultiByteStr == 0) return null;
 		try {
 			/* NOTE: CF_HTML uses UTF-8 encoding.
 			 * The MSDN documentation for MultiByteToWideChar states that dwFlags must be set to 0 for UTF-8.
 			 * Otherwise, the function fails with ERROR_INVALID_FLAGS. */
 			int cchWideChar  = OS.MultiByteToWideChar (OS.CP_UTF8, 0, lpMultiByteStr, -1, null, 0);
 			if (cchWideChar == 0) return null;
 			char[] lpWideCharStr = new char [cchWideChar - 1];
 			OS.MultiByteToWideChar (OS.CP_UTF8, 0, lpMultiByteStr, -1, lpWideCharStr, lpWideCharStr.length);
 			String string = new String(lpWideCharStr);
 			int fragmentStart = 0, fragmentEnd = 0;
 			int start = string.indexOf(StartFragment) + StartFragment.length();
 			int end = start + 1;
 			while (end < string.length()) {
 				String s = string.substring(start, end);
 				try {
 					fragmentStart = Integer.parseInt(s);
 					end++;
 				} catch (NumberFormatException e) {
 					break;
 				}
 			}
 			start = string.indexOf(EndFragment) + EndFragment.length();
 			end = start + 1;
 			while (end < string.length()) {
 				String s = string.substring(start, end);
 				try {
 					fragmentEnd = Integer.parseInt(s);
 					end++;
 				} catch (NumberFormatException e) {
 					break;
 				}
 			}
 			if (fragmentEnd <= fragmentStart || fragmentEnd > C.strlen(lpMultiByteStr)) return null;
 			cchWideChar = OS.MultiByteToWideChar (OS.CP_UTF8, 0, lpMultiByteStr+fragmentStart, fragmentEnd - fragmentStart, lpWideCharStr, lpWideCharStr.length);
 			if (cchWideChar == 0) return null;
 			String s = new String(lpWideCharStr, 0, cchWideChar);
 			/*
 			 * Firefox includes <!--StartFragment --> in the fragment, so remove it.
 			 */
 			String foxStart = "<!--StartFragment -->\r\n"; //$NON-NLS-1$
 			int prefix = s.indexOf(foxStart);
 			if (prefix != -1) {
 				prefix += foxStart.length();
 				s = s.substring(prefix);
 			}
 			return s;
 		} finally {
 			OS.GlobalUnlock(hMem);
 		}
 	} finally {
 		OS.GlobalFree(hMem);
 	}
 }
 @Override
 protected int[] getTypeIds(){
 	return new int[] {HTML_FORMATID};
 }
 @Override
 protected String[] getTypeNames(){
 	return new String[] {HTML_FORMAT};
 }
 boolean checkHTML(Object object) {
 	return (object != null && object instanceof String && ((String)object).length() > 0);
 }
 @Override
 protected boolean validate(Object object) {
 	return checkHTML(object);
 }
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2017 IBM Corporation and others.
	*
	* This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License 2.0
	* which accompanies this distribution, and is available at
	* https://www.eclipse.org/legal/epl-2.0/
	*
	* SPDX-License-Identifier: EPL-2.0
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.swt.dnd;

	import org.eclipse.swt.internal.*;
	import org.eclipse.swt.internal.ole.win32.*;
	import org.eclipse.swt.internal.win32.*;

	/**
	* The class <code>HTMLTransfer</code> provides a platform specific mechanism
	* for converting text in HTML format represented as a java <code>String</code>
	* to a platform specific representation of the data and vice versa.
	*
	* <p>An example of a java <code>String</code> containing HTML text is shown
	* below:</p>
	*
	* <pre><code>
	* String htmlData = "<p>This is a paragraph of text.</p>";
	* </code></pre>
	*
	* @see Transfer
	*/
	public class HTMLTransfer extends ByteArrayTransfer {

	static HTMLTransfer _instance = new HTMLTransfer();
	static final String HTML_FORMAT = "HTML Format"; //$NON-NLS-1$
	static final int HTML_FORMATID = registerType(HTML_FORMAT);
	static final String NUMBER = "00000000"; //$NON-NLS-1$
	static final String HEADER = "Version:0.9\r\nStartHTML:"+NUMBER+"\r\nEndHTML:"+NUMBER+"\r\nStartFragment:"+NUMBER+"\r\nEndFragment:"+NUMBER+"\r\n";
	static final String PREFIX = "<html><body><!--StartFragment-->"; //$NON-NLS-1$
	static final String SUFFIX = "<!--EndFragment--></body></html>"; //$NON-NLS-1$
	static final String StartFragment = "StartFragment:"; //$NON-NLS-1$
	static final String EndFragment = "EndFragment:"; //$NON-NLS-1$

	private HTMLTransfer() {}

	/**
	* Returns the singleton instance of the HTMLTransfer class.
	*
	* @return the singleton instance of the HTMLTransfer class
	*/
	public static HTMLTransfer getInstance () {
	return _instance;
	}

	/**
	* This implementation of <code>javaToNative</code> converts HTML-formatted text
	* represented by a java <code>String</code> to a platform specific representation.
	*
	* @param object a java <code>String</code> containing HTML text
	* @param transferData an empty <code>TransferData</code> object that will
	* be filled in on return with the platform specific format of the data
	*
	* @see Transfer#nativeToJava
	*/
	@Override
	public void javaToNative (Object object, TransferData transferData){
	if (!checkHTML(object) \|\| !isSupportedType(transferData)) {
	DND.error(DND.ERROR_INVALID_DATA);
	}
	String string = (String)object;
	int count = string.length();
	char[] chars = new char[count + 1];
	string.getChars(0, count, chars, 0);
	/* NOTE: CF_HTML uses UTF-8 encoding. */
	int cchMultiByte = OS.WideCharToMultiByte(OS.CP_UTF8, 0, chars, -1, null, 0, null, null);
	if (cchMultiByte == 0) {
	transferData.stgmedium = new STGMEDIUM();
	transferData.result = COM.DV_E_STGMEDIUM;
	return;
	}
	int startHTML = HEADER.length();
	int startFragment = startHTML + PREFIX.length();
	int endFragment = startFragment + cchMultiByte - 1;
	int endHTML = endFragment + SUFFIX.length();

	StringBuilder buffer = new StringBuilder(HEADER);
	int maxLength = NUMBER.length();
	//startHTML
	int start = buffer.toString().indexOf(NUMBER);
	String temp = Integer.toString(startHTML);
	buffer.replace(start + maxLength-temp.length(), start + maxLength, temp);
	//endHTML
	start = buffer.toString().indexOf(NUMBER, start);
	temp = Integer.toString(endHTML);
	buffer.replace(start + maxLength-temp.length(), start + maxLength, temp);
	//startFragment
	start = buffer.toString().indexOf(NUMBER, start);
	temp = Integer.toString(startFragment);
	buffer.replace(start + maxLength-temp.length(), start + maxLength, temp);
	//endFragment
	start = buffer.toString().indexOf(NUMBER, start);
	temp = Integer.toString(endFragment);
	buffer.replace(start + maxLength-temp.length(), start + maxLength, temp);

	buffer.append(PREFIX);
	buffer.append(string);
	buffer.append(SUFFIX);

	count = buffer.length();
	chars = new char[count + 1];
	buffer.getChars(0, count, chars, 0);
	cchMultiByte = OS.WideCharToMultiByte(OS.CP_UTF8, 0, chars, -1, null, 0, null, null);
	long lpMultiByteStr = OS.GlobalAlloc(OS.GMEM_FIXED \| OS.GMEM_ZEROINIT, cchMultiByte);
	OS.WideCharToMultiByte(OS.CP_UTF8, 0, chars, -1, lpMultiByteStr, cchMultiByte, null, null);
	transferData.stgmedium = new STGMEDIUM();
	transferData.stgmedium.tymed = COM.TYMED_HGLOBAL;
	transferData.stgmedium.unionField = lpMultiByteStr;
	transferData.stgmedium.pUnkForRelease = 0;
	transferData.result = COM.S_OK;
	return;
	}

	/**
	* This implementation of <code>nativeToJava</code> converts a platform specific
	* representation of HTML text to a java <code>String</code>.
	*
	* @param transferData the platform specific representation of the data to be converted
	* @return a java <code>String</code> containing HTML text if the conversion was successful;
	* otherwise null
	*
	* @see Transfer#javaToNative
	*/
	@Override
	public Object nativeToJava(TransferData transferData){
	if (!isSupportedType(transferData) \|\| transferData.pIDataObject == 0) return null;
	IDataObject data = new IDataObject(transferData.pIDataObject);
	data.AddRef();
	STGMEDIUM stgmedium = new STGMEDIUM();
	FORMATETC formatetc = transferData.formatetc;
	stgmedium.tymed = COM.TYMED_HGLOBAL;
	transferData.result = getData(data, formatetc, stgmedium);
	data.Release();
	if (transferData.result != COM.S_OK) return null;
	long hMem = stgmedium.unionField;

	try {
	long lpMultiByteStr = OS.GlobalLock(hMem);
	if (lpMultiByteStr == 0) return null;
	try {
	/* NOTE: CF_HTML uses UTF-8 encoding.
	* The MSDN documentation for MultiByteToWideChar states that dwFlags must be set to 0 for UTF-8.
	* Otherwise, the function fails with ERROR_INVALID_FLAGS. */
	int cchWideChar = OS.MultiByteToWideChar (OS.CP_UTF8, 0, lpMultiByteStr, -1, null, 0);
	if (cchWideChar == 0) return null;
	char[] lpWideCharStr = new char [cchWideChar - 1];
	OS.MultiByteToWideChar (OS.CP_UTF8, 0, lpMultiByteStr, -1, lpWideCharStr, lpWideCharStr.length);
	String string = new String(lpWideCharStr);
	int fragmentStart = 0, fragmentEnd = 0;
	int start = string.indexOf(StartFragment) + StartFragment.length();
	int end = start + 1;
	while (end < string.length()) {
	String s = string.substring(start, end);
	try {
	fragmentStart = Integer.parseInt(s);
	end++;
	} catch (NumberFormatException e) {
	break;
	}
	}
	start = string.indexOf(EndFragment) + EndFragment.length();
	end = start + 1;
	while (end < string.length()) {
	String s = string.substring(start, end);
	try {
	fragmentEnd = Integer.parseInt(s);
	end++;
	} catch (NumberFormatException e) {
	break;
	}
	}
	if (fragmentEnd <= fragmentStart \|\| fragmentEnd > C.strlen(lpMultiByteStr)) return null;
	cchWideChar = OS.MultiByteToWideChar (OS.CP_UTF8, 0, lpMultiByteStr+fragmentStart, fragmentEnd - fragmentStart, lpWideCharStr, lpWideCharStr.length);
	if (cchWideChar == 0) return null;
	String s = new String(lpWideCharStr, 0, cchWideChar);
	/*
	* Firefox includes <!--StartFragment --> in the fragment, so remove it.
	*/
	String foxStart = "<!--StartFragment -->\r\n"; //$NON-NLS-1$
	int prefix = s.indexOf(foxStart);
	if (prefix != -1) {
	prefix += foxStart.length();
	s = s.substring(prefix);
	}
	return s;
	} finally {
	OS.GlobalUnlock(hMem);
	}
	} finally {
	OS.GlobalFree(hMem);
	}
	}
	@Override
	protected int[] getTypeIds(){
	return new int[] {HTML_FORMATID};
	}
	@Override
	protected String[] getTypeNames(){
	return new String[] {HTML_FORMAT};
	}
	boolean checkHTML(Object object) {
	return (object != null && object instanceof String && ((String)object).length() > 0);
	}
	@Override
	protected boolean validate(Object object) {
	return checkHTML(object);
	}
	}