Java example source code file (WDataTransferer.java)
The WDataTransferer.java Java example source code/*
* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.awt.windows;
import java.awt.Image;
import java.awt.Graphics2D;
import java.awt.Transparency;
import java.awt.color.ColorSpace;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.FlavorTable;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.ComponentColorModel;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.awt.image.DataBufferInt;
import java.awt.image.DirectColorModel;
import java.awt.image.ImageObserver;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.io.File;
import java.net.URL;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.SortedMap;
import sun.awt.Mutex;
import sun.awt.datatransfer.DataTransferer;
import sun.awt.datatransfer.ToolkitThreadBlockedHandler;
import sun.awt.image.ImageRepresentation;
import sun.awt.image.ToolkitImage;
import java.util.ArrayList;
import java.io.ByteArrayOutputStream;
/**
* Platform-specific support for the data transfer subsystem.
*
* @author David Mendenhall
* @author Danila Sinopalnikov
*
* @since 1.3.1
*/
public class WDataTransferer extends DataTransferer {
private static final String[] predefinedClipboardNames = {
"",
"TEXT",
"BITMAP",
"METAFILEPICT",
"SYLK",
"DIF",
"TIFF",
"OEM TEXT",
"DIB",
"PALETTE",
"PENDATA",
"RIFF",
"WAVE",
"UNICODE TEXT",
"ENHMETAFILE",
"HDROP",
"LOCALE",
"DIBV5"
};
private static final Map <String, Long> predefinedClipboardNameMap;
static {
Map <String,Long> tempMap =
new HashMap <> (predefinedClipboardNames.length, 1.0f);
for (int i = 1; i < predefinedClipboardNames.length; i++) {
tempMap.put(predefinedClipboardNames[i], Long.valueOf(i));
}
predefinedClipboardNameMap =
Collections.synchronizedMap(tempMap);
}
/**
* from winuser.h
*/
public static final int CF_TEXT = 1;
public static final int CF_METAFILEPICT = 3;
public static final int CF_DIB = 8;
public static final int CF_ENHMETAFILE = 14;
public static final int CF_HDROP = 15;
public static final int CF_LOCALE = 16;
public static final long CF_HTML = registerClipboardFormat("HTML Format");
public static final long CFSTR_INETURL = registerClipboardFormat("UniformResourceLocator");
public static final long CF_PNG = registerClipboardFormat("PNG");
public static final long CF_JFIF = registerClipboardFormat("JFIF");
public static final long CF_FILEGROUPDESCRIPTORW = registerClipboardFormat("FileGroupDescriptorW");
public static final long CF_FILEGROUPDESCRIPTORA = registerClipboardFormat("FileGroupDescriptor");
//CF_FILECONTENTS supported as mandatory associated clipboard
private static final Long L_CF_LOCALE =
predefinedClipboardNameMap.get(predefinedClipboardNames[CF_LOCALE]);
private static final DirectColorModel directColorModel =
new DirectColorModel(24,
0x00FF0000, /* red mask */
0x0000FF00, /* green mask */
0x000000FF); /* blue mask */
private static final int[] bandmasks = new int[] {
directColorModel.getRedMask(),
directColorModel.getGreenMask(),
directColorModel.getBlueMask() };
/**
* Singleton constructor
*/
private WDataTransferer() {
}
private static WDataTransferer transferer;
public static WDataTransferer getInstanceImpl() {
if (transferer == null) {
synchronized (WDataTransferer.class) {
if (transferer == null) {
transferer = new WDataTransferer();
}
}
}
return transferer;
}
public SortedMap <Long, DataFlavor> getFormatsForFlavors(
DataFlavor[] flavors, FlavorTable map)
{
SortedMap <Long, DataFlavor> retval =
super.getFormatsForFlavors(flavors, map);
// The Win32 native code does not support exporting LOCALE data, nor
// should it.
retval.remove(L_CF_LOCALE);
return retval;
}
public String getDefaultUnicodeEncoding() {
return "utf-16le";
}
public byte[] translateTransferable(Transferable contents,
DataFlavor flavor,
long format) throws IOException
{
byte[] bytes = null;
if (format == CF_HTML) {
if (contents.isDataFlavorSupported(DataFlavor.selectionHtmlFlavor)) {
// if a user provides data represented by
// DataFlavor.selectionHtmlFlavor format, we use this
// type to store the data in the native clipboard
bytes = super.translateTransferable(contents,
DataFlavor.selectionHtmlFlavor,
format);
} else if (contents.isDataFlavorSupported(DataFlavor.allHtmlFlavor)) {
// if we cannot get data represented by the
// DataFlavor.selectionHtmlFlavor format
// but the DataFlavor.allHtmlFlavor format is avialable
// we belive that the user knows how to represent
// the data and how to mark up selection in a
// system specific manner. Therefor, we use this data
bytes = super.translateTransferable(contents,
DataFlavor.allHtmlFlavor,
format);
} else {
// handle other html flavor types, including custom and
// fragment ones
bytes = HTMLCodec.convertToHTMLFormat(super.translateTransferable(contents, flavor, format));
}
} else {
// we handle non-html types basing on their
// flavors
bytes = super.translateTransferable(contents, flavor, format);
}
return bytes;
}
// The stream is closed as a closable object
public Object translateStream(InputStream str,
DataFlavor flavor, long format,
Transferable localeTransferable)
throws IOException
{
if (format == CF_HTML && flavor.isFlavorTextType()) {
str = new HTMLCodec(str,
EHTMLReadMode.getEHTMLReadMode(flavor));
}
return super.translateStream(str, flavor, format,
localeTransferable);
}
public Object translateBytes(byte[] bytes, DataFlavor flavor, long format,
Transferable localeTransferable) throws IOException
{
if (format == CF_FILEGROUPDESCRIPTORA || format == CF_FILEGROUPDESCRIPTORW) {
if (bytes == null || !DataFlavor.javaFileListFlavor.equals(flavor)) {
throw new IOException("data translation failed");
}
String st = new String(bytes, 0, bytes.length, "UTF-16LE");
String[] filenames = st.split("\0");
if( 0 == filenames.length ){
return null;
}
// Convert the strings to File objects
File[] files = new File[filenames.length];
for (int i = 0; i < filenames.length; ++i) {
files[i] = new File(filenames[i]);
//They are temp-files from memory Stream, so they have to be removed on exit
files[i].deleteOnExit();
}
// Turn the list of Files into a List and return
return Arrays.asList(files);
}
if (format == CFSTR_INETURL &&
URL.class.equals(flavor.getRepresentationClass()))
{
String charset = getDefaultTextCharset();
if (localeTransferable != null && localeTransferable.
isDataFlavorSupported(javaTextEncodingFlavor))
{
try {
charset = new String((byte[])localeTransferable.
getTransferData(javaTextEncodingFlavor), "UTF-8");
} catch (UnsupportedFlavorException cannotHappen) {
}
}
return new URL(new String(bytes, charset));
}
return super.translateBytes(bytes , flavor, format,
localeTransferable);
}
public boolean isLocaleDependentTextFormat(long format) {
return format == CF_TEXT || format == CFSTR_INETURL;
}
public boolean isFileFormat(long format) {
return format == CF_HDROP || format == CF_FILEGROUPDESCRIPTORA || format == CF_FILEGROUPDESCRIPTORW;
}
protected Long getFormatForNativeAsLong(String str) {
Long format = predefinedClipboardNameMap.get(str);
if (format == null) {
format = Long.valueOf(registerClipboardFormat(str));
}
return format;
}
protected String getNativeForFormat(long format) {
return (format < predefinedClipboardNames.length)
? predefinedClipboardNames[(int)format]
: getClipboardFormatName(format);
}
private final ToolkitThreadBlockedHandler handler =
new WToolkitThreadBlockedHandler();
public ToolkitThreadBlockedHandler getToolkitThreadBlockedHandler() {
return handler;
}
/**
* Calls the Win32 RegisterClipboardFormat function to register
* a non-standard format.
*/
private static native long registerClipboardFormat(String str);
/**
* Calls the Win32 GetClipboardFormatName function which is
* the reverse operation of RegisterClipboardFormat.
*/
private static native String getClipboardFormatName(long format);
public boolean isImageFormat(long format) {
return format == CF_DIB || format == CF_ENHMETAFILE ||
format == CF_METAFILEPICT || format == CF_PNG ||
format == CF_JFIF;
}
protected byte[] imageToPlatformBytes(Image image, long format)
throws IOException {
String mimeType = null;
if (format == CF_PNG) {
mimeType = "image/png";
} else if (format == CF_JFIF) {
mimeType = "image/jpeg";
}
if (mimeType != null) {
return imageToStandardBytes(image, mimeType);
}
int width = 0;
int height = 0;
if (image instanceof ToolkitImage) {
ImageRepresentation ir = ((ToolkitImage)image).getImageRep();
ir.reconstruct(ImageObserver.ALLBITS);
width = ir.getWidth();
height = ir.getHeight();
} else {
width = image.getWidth(null);
height = image.getHeight(null);
}
// Fix for 4919639.
// Some Windows native applications (e.g. clipbrd.exe) do not handle
// 32-bpp DIBs correctly.
// As a workaround we switched to 24-bpp DIBs.
// MSDN prescribes that the bitmap array for a 24-bpp should consist of
// 3-byte triplets representing blue, green and red components of a
// pixel respectively. Additionally each scan line must be padded with
// zeroes to end on a LONG data-type boundary. LONG is always 32-bit.
// We render the given Image to a BufferedImage of type TYPE_3BYTE_BGR
// with non-default scanline stride and pass the resulting data buffer
// to the native code to fill the BITMAPINFO structure.
int mod = (width * 3) % 4;
int pad = mod > 0 ? 4 - mod : 0;
ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_sRGB);
int[] nBits = {8, 8, 8};
int[] bOffs = {2, 1, 0};
ColorModel colorModel =
new ComponentColorModel(cs, nBits, false, false,
Transparency.OPAQUE, DataBuffer.TYPE_BYTE);
WritableRaster raster =
Raster.createInterleavedRaster(DataBuffer.TYPE_BYTE, width, height,
width * 3 + pad, 3, bOffs, null);
BufferedImage bimage = new BufferedImage(colorModel, raster, false, null);
// Some Windows native applications (e.g. clipbrd.exe) do not understand
// top-down DIBs.
// So we flip the image vertically and create a bottom-up DIB.
AffineTransform imageFlipTransform =
new AffineTransform(1, 0, 0, -1, 0, height);
Graphics2D g2d = bimage.createGraphics();
try {
g2d.drawImage(image, imageFlipTransform, null);
} finally {
g2d.dispose();
}
DataBufferByte buffer = (DataBufferByte)raster.getDataBuffer();
byte[] imageData = buffer.getData();
return imageDataToPlatformImageBytes(imageData, width, height, format);
}
private static final byte [] UNICODE_NULL_TERMINATOR = new byte [] {0,0};
protected ByteArrayOutputStream convertFileListToBytes(ArrayList<String> fileList)
throws IOException
{
ByteArrayOutputStream bos = new ByteArrayOutputStream();
if(fileList.isEmpty()) {
//store empty unicode string (null terminator)
bos.write(UNICODE_NULL_TERMINATOR);
} else {
for (int i = 0; i < fileList.size(); i++) {
byte[] bytes = fileList.get(i).getBytes(getDefaultUnicodeEncoding());
//store unicode string with null terminator
bos.write(bytes, 0, bytes.length);
bos.write(UNICODE_NULL_TERMINATOR);
}
}
// According to MSDN the byte array have to be double NULL-terminated.
// The array contains Unicode characters, so each NULL-terminator is
// a pair of bytes
bos.write(UNICODE_NULL_TERMINATOR);
return bos;
}
/**
* Returns a byte array which contains data special for the given format
* and for the given image data.
*/
private native byte[] imageDataToPlatformImageBytes(byte[] imageData,
int width, int height,
long format);
/**
* Translates either a byte array or an input stream which contain
* platform-specific image data in the given format into an Image.
*/
protected Image platformImageBytesToImage(byte[] bytes, long format)
throws IOException {
String mimeType = null;
if (format == CF_PNG) {
mimeType = "image/png";
} else if (format == CF_JFIF) {
mimeType = "image/jpeg";
}
if (mimeType != null) {
return standardImageBytesToImage(bytes, mimeType);
}
int[] imageData = platformImageBytesToImageData(bytes, format);
if (imageData == null) {
throw new IOException("data translation failed");
}
int len = imageData.length - 2;
int width = imageData[len];
int height = imageData[len + 1];
DataBufferInt buffer = new DataBufferInt(imageData, len);
WritableRaster raster = Raster.createPackedRaster(buffer, width,
height, width,
bandmasks, null);
return new BufferedImage(directColorModel, raster, false, null);
}
/**
* Translates a byte array which contains platform-specific image data in
* the given format into an integer array which contains pixel values in
* ARGB format. The two last elements in the array specify width and
* height of the image respectively.
*/
private native int[] platformImageBytesToImageData(byte[] bytes,
long format)
throws IOException;
protected native String[] dragQueryFile(byte[] bytes);
}
final class WToolkitThreadBlockedHandler extends Mutex
implements ToolkitThreadBlockedHandler {
public void enter() {
if (!isOwned()) {
throw new IllegalMonitorStateException();
}
unlock();
startSecondaryEventLoop();
lock();
}
public void exit() {
if (!isOwned()) {
throw new IllegalMonitorStateException();
}
WToolkit.quitSecondaryEventLoop();
}
private native void startSecondaryEventLoop();
}
enum EHTMLReadMode {
HTML_READ_ALL,
HTML_READ_FRAGMENT,
HTML_READ_SELECTION;
public static EHTMLReadMode getEHTMLReadMode (DataFlavor df) {
EHTMLReadMode mode = HTML_READ_SELECTION;
String parameter = df.getParameter("document");
if ("all".equals(parameter)) {
mode = HTML_READ_ALL;
} else if ("fragment".equals(parameter)) {
mode = HTML_READ_FRAGMENT;
}
return mode;
}
}
/**
* on decode: This stream takes an InputStream which provides data in CF_HTML format,
* strips off the description and context to extract the original HTML data.
*
* on encode: static convertToHTMLFormat is responsible for HTML clipboard header creation
*/
class HTMLCodec extends InputStream {
//static section
public static final String ENCODING = "UTF-8";
public static final String VERSION = "Version:";
public static final String START_HTML = "StartHTML:";
public static final String END_HTML = "EndHTML:";
public static final String START_FRAGMENT = "StartFragment:";
public static final String END_FRAGMENT = "EndFragment:";
public static final String START_SELECTION = "StartSelection:"; //optional
public static final String END_SELECTION = "EndSelection:"; //optional
public static final String START_FRAGMENT_CMT = "<!--StartFragment-->";
public static final String END_FRAGMENT_CMT = "<!--EndFragment-->";
public static final String SOURCE_URL = "SourceURL:";
public static final String DEF_SOURCE_URL = "about:blank";
public static final String EOLN = "\r\n";
private static final String VERSION_NUM = "1.0";
private static final int PADDED_WIDTH = 10;
private static String toPaddedString(int n, int width) {
String string = "" + n;
int len = string.length();
if (n >= 0 && len < width) {
char[] array = new char[width - len];
Arrays.fill(array, '0');
StringBuffer buffer = new StringBuffer(width);
buffer.append(array);
buffer.append(string);
string = buffer.toString();
}
return string;
}
/**
* convertToHTMLFormat adds the MS HTML clipboard header to byte array that
* contains the parameters pairs.
*
* The consequence of parameters is fixed, but some or all of them could be
* omitted. One parameter per one text line.
* It looks like that:
*
* Version:1.0\r\n -- current supported version
* StartHTML:000000192\r\n -- shift in array to the first byte after the header
* EndHTML:000000757\r\n -- shift in array of last byte for HTML syntax analysis
* StartFragment:000000396\r\n -- shift in array jast after <!--StartFragment-->
* EndFragment:000000694\r\n -- shift in array before start <!--EndFragment-->
* StartSelection:000000398\r\n -- shift in array of the first char in copied selection
* EndSelection:000000692\r\n -- shift in array of the last char in copied selection
* SourceURL:http://sun.com/\r\n -- base URL for related referenses
* <HTML>..............................
* ^ ^ ^ ^^ ^
* \ StartHTML | \-StartSelection | \EndFragment EndHTML/
* \-StartFragment \EndSelection
*
*Combinations with tags sequence
*<!--StartFragment-->......
* or
*<HTML>.........
* are vailid too.
*/
public static byte[] convertToHTMLFormat(byte[] bytes) {
// Calculate section offsets
String htmlPrefix = "";
String htmlSuffix = "";
{
//we have extend the fragment to full HTML document correctly
//to avoid HTML and BODY tags doubling
String stContext = new String(bytes);
String stUpContext = stContext.toUpperCase();
if( -1 == stUpContext.indexOf("<HTML") ) {
htmlPrefix = "<HTML>";
htmlSuffix = "</HTML>";
if( -1 == stUpContext.indexOf("<BODY") ) {
htmlPrefix = htmlPrefix +"<BODY>";
htmlSuffix = "</BODY>" + htmlSuffix;
};
};
}
String stBaseUrl = DEF_SOURCE_URL;
int nStartHTML =
VERSION.length() + VERSION_NUM.length() + EOLN.length()
+ START_HTML.length() + PADDED_WIDTH + EOLN.length()
+ END_HTML.length() + PADDED_WIDTH + EOLN.length()
+ START_FRAGMENT.length() + PADDED_WIDTH + EOLN.length()
+ END_FRAGMENT.length() + PADDED_WIDTH + EOLN.length()
+ SOURCE_URL.length() + stBaseUrl.length() + EOLN.length()
;
int nStartFragment = nStartHTML + htmlPrefix.length();
int nEndFragment = nStartFragment + bytes.length - 1;
int nEndHTML = nEndFragment + htmlSuffix.length();
StringBuilder header = new StringBuilder(
nStartFragment
+ START_FRAGMENT_CMT.length()
);
//header
header.append(VERSION);
header.append(VERSION_NUM);
header.append(EOLN);
header.append(START_HTML);
header.append(toPaddedString(nStartHTML, PADDED_WIDTH));
header.append(EOLN);
header.append(END_HTML);
header.append(toPaddedString(nEndHTML, PADDED_WIDTH));
header.append(EOLN);
header.append(START_FRAGMENT);
header.append(toPaddedString(nStartFragment, PADDED_WIDTH));
header.append(EOLN);
header.append(END_FRAGMENT);
header.append(toPaddedString(nEndFragment, PADDED_WIDTH));
header.append(EOLN);
header.append(SOURCE_URL);
header.append(stBaseUrl);
header.append(EOLN);
//HTML
header.append(htmlPrefix);
byte[] headerBytes = null, trailerBytes = null;
try {
headerBytes = header.toString().getBytes(ENCODING);
trailerBytes = htmlSuffix.getBytes(ENCODING);
} catch (UnsupportedEncodingException cannotHappen) {
}
byte[] retval = new byte[headerBytes.length + bytes.length +
trailerBytes.length];
System.arraycopy(headerBytes, 0, retval, 0, headerBytes.length);
System.arraycopy(bytes, 0, retval, headerBytes.length,
bytes.length - 1);
System.arraycopy(trailerBytes, 0, retval,
headerBytes.length + bytes.length - 1,
trailerBytes.length);
retval[retval.length-1] = 0;
return retval;
}
////////////////////////////////////
//decoder instance data and methods:
private final BufferedInputStream bufferedStream;
private boolean descriptionParsed = false;
private boolean closed = false;
// InputStreamReader uses an 8K buffer. The size is not customizable.
public static final int BYTE_BUFFER_LEN = 8192;
// CharToByteUTF8.getMaxBytesPerChar returns 3, so we should not buffer
// more chars than 3 times the number of bytes we can buffer.
public static final int CHAR_BUFFER_LEN = BYTE_BUFFER_LEN / 3;
private static final String FAILURE_MSG =
"Unable to parse HTML description: ";
private static final String INVALID_MSG =
" invalid";
//HTML header mapping:
private long iHTMLStart,// StartHTML -- shift in array to the first byte after the header
iHTMLEnd, // EndHTML -- shift in array of last byte for HTML syntax analysis
iFragStart,// StartFragment -- shift in array jast after <!--StartFragment-->
iFragEnd, // EndFragment -- shift in array before start <!--EndFragment-->
iSelStart, // StartSelection -- shift in array of the first char in copied selection
iSelEnd; // EndSelection -- shift in array of the last char in copied selection
private String stBaseURL; // SourceURL -- base URL for related referenses
private String stVersion; // Version -- current supported version
//Stream reader markers:
private long iStartOffset,
iEndOffset,
iReadCount;
private EHTMLReadMode readMode;
public HTMLCodec(
InputStream _bytestream,
EHTMLReadMode _readMode) throws IOException
{
bufferedStream = new BufferedInputStream(_bytestream, BYTE_BUFFER_LEN);
readMode = _readMode;
}
public synchronized String getBaseURL() throws IOException
{
if( !descriptionParsed ) {
parseDescription();
}
return stBaseURL;
}
public synchronized String getVersion() throws IOException
{
if( !descriptionParsed ) {
parseDescription();
}
return stVersion;
}
/**
* parseDescription parsing HTML clipboard header as it described in
* comment to convertToHTMLFormat
*/
private void parseDescription() throws IOException
{
stBaseURL = null;
stVersion = null;
// initialization of array offset pointers
// to the same "uninitialized" state.
iHTMLEnd =
iHTMLStart =
iFragEnd =
iFragStart =
iSelEnd =
iSelStart = -1;
bufferedStream.mark(BYTE_BUFFER_LEN);
String astEntries[] = new String[] {
//common
VERSION,
START_HTML,
END_HTML,
START_FRAGMENT,
END_FRAGMENT,
//ver 1.0
START_SELECTION,
END_SELECTION,
SOURCE_URL
};
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(
bufferedStream,
ENCODING
),
CHAR_BUFFER_LEN
);
long iHeadSize = 0;
long iCRSize = EOLN.length();
int iEntCount = astEntries.length;
boolean bContinue = true;
for( int iEntry = 0; iEntry < iEntCount; ++iEntry ){
String stLine = bufferedReader.readLine();
if( null==stLine ) {
break;
}
//some header entries are optional, but the order is fixed.
for( ; iEntry < iEntCount; ++iEntry ){
if( !stLine.startsWith(astEntries[iEntry]) ) {
continue;
}
iHeadSize += stLine.length() + iCRSize;
String stValue = stLine.substring(astEntries[iEntry].length()).trim();
if( null!=stValue ) {
try{
switch( iEntry ){
case 0:
stVersion = stValue;
break;
case 1:
iHTMLStart = Integer.parseInt(stValue);
break;
case 2:
iHTMLEnd = Integer.parseInt(stValue);
break;
case 3:
iFragStart = Integer.parseInt(stValue);
break;
case 4:
iFragEnd = Integer.parseInt(stValue);
break;
case 5:
iSelStart = Integer.parseInt(stValue);
break;
case 6:
iSelEnd = Integer.parseInt(stValue);
break;
case 7:
stBaseURL = stValue;
break;
};
} catch ( NumberFormatException e ) {
throw new IOException(FAILURE_MSG + astEntries[iEntry]+ " value " + e + INVALID_MSG);
}
}
break;
}
}
//some entries could absent in HTML header,
//so we have find they by another way.
if( -1 == iHTMLStart )
iHTMLStart = iHeadSize;
if( -1 == iFragStart )
iFragStart = iHTMLStart;
if( -1 == iFragEnd )
iFragEnd = iHTMLEnd;
if( -1 == iSelStart )
iSelStart = iFragStart;
if( -1 == iSelEnd )
iSelEnd = iFragEnd;
//one of possible modes
switch( readMode ){
case HTML_READ_ALL:
iStartOffset = iHTMLStart;
iEndOffset = iHTMLEnd;
break;
case HTML_READ_FRAGMENT:
iStartOffset = iFragStart;
iEndOffset = iFragEnd;
break;
case HTML_READ_SELECTION:
default:
iStartOffset = iSelStart;
iEndOffset = iSelEnd;
break;
}
bufferedStream.reset();
if( -1 == iStartOffset ){
throw new IOException(FAILURE_MSG + "invalid HTML format.");
}
int curOffset = 0;
while (curOffset < iStartOffset){
curOffset += bufferedStream.skip(iStartOffset - curOffset);
}
iReadCount = curOffset;
if( iStartOffset != iReadCount ){
throw new IOException(FAILURE_MSG + "Byte stream ends in description.");
}
descriptionParsed = true;
}
public synchronized int read() throws IOException {
if( closed ){
throw new IOException("Stream closed");
}
if( !descriptionParsed ){
parseDescription();
}
if( -1 != iEndOffset && iReadCount >= iEndOffset ) {
return -1;
}
int retval = bufferedStream.read();
if( retval == -1 ) {
return -1;
}
++iReadCount;
return retval;
}
public synchronized void close() throws IOException {
if( !closed ){
closed = true;
bufferedStream.close();
}
}
}
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