1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/*******************************************************************************
* 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();
StringBuffer buffer = new StringBuffer(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 /*int*/ 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 /*int*/ hMem = stgmedium.unionField;
try {
long /*int*/ 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);
}
}
|
