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/*
* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.faces.util;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.nio.charset.Charset;
import java.util.Arrays;
import java.util.BitSet;
import java.util.HashSet;
import java.util.Set;
import com.sun.faces.RIConstants;
/**
* Utility class for HTML. Kudos to Adam Winer (Oracle) for much of this code.
*/
public class HtmlUtils {
private final static Set UTF_CHARSET = new HashSet<>(Arrays.asList("UTF-8", "UTF-16", "UTF-16BE", "UTF-16LE", "UTF-32", "UTF-32BE", "UTF-32LE",
"x-UTF-16LE-BOM", "X-UTF-32BE-BOM", "X-UTF-32LE-BOM", ""));
// -------------------------------------------------
// The following methods include the handling of
// escape characters....
// -------------------------------------------------
static public void writeText(Writer out, boolean escapeUnicode, boolean escapeIsocode, char[] buffer, char[] text, boolean forXml) throws IOException {
writeText(out, escapeUnicode, escapeIsocode, buffer, text, 0, text.length, forXml);
}
/**
* Write char array text.
*/
static public void writeText(Writer out, boolean escapeUnicode, boolean escapeIsocode, char[] buff, char[] text, int start, int length, boolean forXml) throws IOException {
int buffLength = buff.length;
int buffIndex = 0;
int end = start + length;
for (int i = start; i < end; i++) {
buffIndex = writeTextChar(out, escapeUnicode, escapeIsocode, text[i], buffIndex, buff, buffLength, forXml);
}
flushBuffer(out, buff, buffIndex);
}
/**
* Write String text.
*/
static public void writeText(Writer out, boolean escapeUnicode, boolean escapeIsocode, char[] buff, String text, char[] textBuff, boolean forXml) throws IOException {
int length = text.length();
if (length >= 16) {
text.getChars(0, length, textBuff, 0);
writeText(out, escapeUnicode, escapeIsocode, buff, textBuff, 0, length, forXml);
} else {
int buffLength = buff.length;
int buffIndex = 0;
for (int i = 0; i < length; i++) {
char ch = text.charAt(i);
buffIndex = writeTextChar(out, escapeUnicode, escapeIsocode, ch, buffIndex, buff, buffLength, forXml);
}
flushBuffer(out, buff, buffIndex);
}
}
private static int writeTextChar(Writer out, boolean escapeUnicode, boolean escapeIsocode, char ch, int buffIndex, char[] buff, int buffLength, boolean forXml)
throws IOException {
int nextIndex;
if (ch <= 0x1f) {
if (!isPrintableControlChar(ch, forXml)) {
return buffIndex;
}
}
if (ch < 0xA0) {
// If "?" or over, no escaping is needed (this covers
// most of the Latin alphabet)
if (ch >= 0x3f) {
nextIndex = addToBuffer(out, buff, buffIndex, buffLength, ch);
} else if (ch >= 0x27) { // If above "'"...
// If between "'" and ";", no escaping is needed
if (ch < 0x3c) {
nextIndex = addToBuffer(out, buff, buffIndex, buffLength, ch);
} else if (ch == '<') {
nextIndex = addToBuffer(out, buff, buffIndex, buffLength, LT_CHARS);
} else if (ch == '>') {
nextIndex = addToBuffer(out, buff, buffIndex, buffLength, GT_CHARS);
} else {
nextIndex = addToBuffer(out, buff, buffIndex, buffLength, ch);
}
} else {
if (ch == '&') {
nextIndex = addToBuffer(out, buff, buffIndex, buffLength, AMP_CHARS);
} else if (ch == '"') {
nextIndex = addToBuffer(out, buff, buffIndex, buffLength, "\"".toCharArray());
} else {
nextIndex = addToBuffer(out, buff, buffIndex, buffLength, ch);
}
}
} else if (ch <= 0xff) {
if (escapeIsocode) {
// ISO-8859-1 entities: encode as needed
nextIndex = addToBuffer(out, buff, buffIndex, buffLength, sISO8859_1_Entities[ch - 0xA0]);
} else {
nextIndex = addToBuffer(out, buff, buffIndex, buffLength, ch);
}
} else {
if (escapeUnicode) {
// UNICODE entities: encode as needed
nextIndex = _writeDecRef(out, buff, buffIndex, buffLength, ch);
} else {
if (forXml && !isAllowedXmlCharacter(ch)) {
return buffIndex;
}
nextIndex = addToBuffer(out, buff, buffIndex, buffLength, ch);
}
}
return nextIndex;
}
/**
* Write a string attribute. Note that this code is duplicated below for character arrays - change both places if you
* make any changes!!!
*/
static public void writeAttribute(Writer out, boolean escapeUnicode, boolean escapeIsocode, char[] buff, String text, char[] textBuff,
boolean isScriptInAttributeValueEnabled, boolean forXml) throws IOException {
int length = text.length();
if (length >= 16) {
if (length > textBuff.length) {
// resize our buffer
textBuff = new char[length * 2];
}
text.getChars(0, length, textBuff, 0);
writeAttribute(out, escapeUnicode, escapeIsocode, buff, textBuff, 0, length, isScriptInAttributeValueEnabled, forXml);
} else {
int buffLength = buff.length;
int buffIndex = 0;
for (int i = 0; i < length; i++) {
char ch = text.charAt(i);
if (ch <= 0x1f) {
if (!isPrintableControlChar(ch, forXml)) {
continue;
}
}
// Tilde or less...
if (ch < 0xA0) {
// If "?" or over, no escaping is needed (this covers
// most of the Latin alphabet)
if (ch >= 0x3f) {
if (ch == 's') {
// If putting scripts in attribute values
// has been disabled (the defualt), look for
// script: in the attribute value.
// ensure the attribute value is long enough
// to accomodate "script:"
if (!isScriptInAttributeValueEnabled && i + 6 < text.length()) {
if ('c' == text.charAt(i + 1) && 'r' == text.charAt(i + 2) && 'i' == text.charAt(i + 3) && 'p' == text.charAt(i + 4)
&& 't' == text.charAt(i + 5) && ':' == text.charAt(i + 6)) {
return;
}
}
}
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, ch);
} else if (ch >= 0x27) { // If above "'"...
// If between "'" and ";", no escaping is needed
if (ch < 0x3c) {
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, ch);
} else if (ch == '<') {
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, LT_CHARS);
} else if (ch == '>') {
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, GT_CHARS);
} else {
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, ch);
}
} else {
if (ch == '&') {
// HTML 4.0, section B.7.1: ampersands followed by
// an open brace don't get escaped
if (i + 1 < length && text.charAt(i + 1) == '{') {
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, ch);
} else {
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, AMP_CHARS);
}
} else if (ch == '"') {
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, QUOT_CHARS);
} else {
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, ch);
}
}
} else if (ch <= 0xff) {
if (escapeIsocode) {
// ISO-8859-1 entities: encode as needed
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, sISO8859_1_Entities[ch - 0xA0]);
} else {
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, ch);
}
} else {
if (escapeUnicode) {
// UNICODE entities: encode as needed
buffIndex = _writeDecRef(out, buff, buffIndex, buffLength, ch);
} else {
if (forXml && !isAllowedXmlCharacter(ch)) {
continue;
}
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, ch);
}
}
}
flushBuffer(out, buff, buffIndex);
}
}
/**
* Write a character array attribute. Note that this code is duplicated above for string - change both places if you
* make any changes!!!
*/
static public void writeAttribute(Writer out, boolean escapeUnicode, boolean escapeIsocode, char[] buff, char[] text, int start, int length,
boolean isScriptInAttributeValueEnabled, boolean forXml) throws IOException {
int buffLength = buff.length;
int buffIndex = 0;
int end = start + length;
for (int i = start; i < end; i++) {
char ch = text[i];
// "Application Program Command" or less...
if (ch <= 0x1f) {
if (!isPrintableControlChar(ch, forXml)) {
continue;
}
}
if (ch < 0xA0) {
// If "?" or over, no escaping is needed (this covers
// most of the Latin alphabet)
if (ch >= 0x3f) {
if (ch == 's') {
// If putting scripts in attribute values
// has been disabled (the defualt), look for
// script: in the attribute value.
// ensure the attribute value is long enough
// to accomodate "script:"
if (!isScriptInAttributeValueEnabled && i + 6 < text.length) {
if ('c' == text[i + 1] && 'r' == text[i + 2] && 'i' == text[i + 3] && 'p' == text[i + 4] && 't' == text[i + 5]
&& ':' == text[i + 6]) {
return;
}
}
}
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, ch);
} else if (ch >= 0x27) { // If above "'"...
if (ch < 0x3c) {
// If between "'" and ";", no escaping is needed
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, ch);
} else if (ch == '<') {
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, LT_CHARS);
} else if (ch == '>') {
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, GT_CHARS);
} else {
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, ch);
}
} else {
if (ch == '&') {
// HTML 4.0, section B.7.1: ampersands followed by
// an open brace don't get escaped
if (i + 1 < end && text[i + 1] == '{') {
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, ch);
} else {
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, AMP_CHARS);
}
} else if (ch == '"') {
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, QUOT_CHARS);
} else {
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, ch);
}
}
} else if (ch <= 0xff) {
if (escapeIsocode) {
// ISO-8859-1 entities: encode as needed
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, sISO8859_1_Entities[ch - 0xA0]);
} else {
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, ch);
}
} else {
if (escapeUnicode) {
// UNICODE entities: encode as needed
buffIndex = _writeDecRef(out, buff, buffIndex, buffLength, ch);
} else {
if (forXml && !isAllowedXmlCharacter(ch)) {
continue;
}
buffIndex = addToBuffer(out, buff, buffIndex, buffLength, ch);
}
}
}
flushBuffer(out, buff, buffIndex);
}
static private boolean isPrintableControlChar(int ch, boolean forXml) {
return (ch == 0x09 || ch == 0x0A || (ch == 0x0C && !forXml) || ch == 0x0D);
}
public static boolean isAllowedXmlCharacter(int ch) {
// See https://www.w3.org/TR/xml/#charsets Character Range
return ch < 0x20 ? isPrintableControlChar(ch, true) : ch <= 0xD7FF || ch >= 0xE000 && ch <= 0xFFFD;
}
/**
* Writes a character as a decimal escape. Hex escapes are smaller than the decimal version, but Netscape didn't support
* hex escapes until 4.7.4.
*/
static private int _writeDecRef(Writer out, char[] buffer, int bufferIndex, int bufferLength, char ch) throws IOException {
if (ch == '\u20ac') {
bufferIndex = addToBuffer(out, buffer, bufferIndex, bufferLength, EURO_CHARS);
return bufferIndex;
}
bufferIndex = addToBuffer(out, buffer, bufferIndex, bufferLength, DEC_REF_START);
// Formerly used String.valueOf(). This version tests out
// about 40% faster in a microbenchmark (and on systems where GC is
// going gonzo, it should be even better)
int i = ch;
if (i > 10000) {
bufferIndex = addToBuffer(out, buffer, bufferIndex, bufferLength, (char) ('0' + i / 10000));
i = i % 10000;
bufferIndex = addToBuffer(out, buffer, bufferIndex, bufferLength, (char) ('0' + i / 1000));
i = i % 1000;
bufferIndex = addToBuffer(out, buffer, bufferIndex, bufferLength, (char) ('0' + i / 100));
i = i % 100;
bufferIndex = addToBuffer(out, buffer, bufferIndex, bufferLength, (char) ('0' + i / 10));
i = i % 10;
bufferIndex = addToBuffer(out, buffer, bufferIndex, bufferLength, (char) ('0' + i));
} else if (i > 1000) {
bufferIndex = addToBuffer(out, buffer, bufferIndex, bufferLength, (char) ('0' + i / 1000));
i = i % 1000;
bufferIndex = addToBuffer(out, buffer, bufferIndex, bufferLength, (char) ('0' + i / 100));
i = i % 100;
bufferIndex = addToBuffer(out, buffer, bufferIndex, bufferLength, (char) ('0' + i / 10));
i = i % 10;
bufferIndex = addToBuffer(out, buffer, bufferIndex, bufferLength, (char) ('0' + i));
} else {
bufferIndex = addToBuffer(out, buffer, bufferIndex, bufferLength, (char) ('0' + i / 100));
i = i % 100;
bufferIndex = addToBuffer(out, buffer, bufferIndex, bufferLength, (char) ('0' + i / 10));
i = i % 10;
bufferIndex = addToBuffer(out, buffer, bufferIndex, bufferLength, (char) ('0' + i));
}
return addToBuffer(out, buffer, bufferIndex, bufferLength, ';');
}
//
// Buffering scheme: we use a tremendously simple buffering
// scheme that greatly reduces the number of calls into the
// Writer/PrintWriter. In practice this has produced significant
// measured performance gains (at least in JDK 1.3.1).
//
/**
* Add a character to the buffer, flushing the buffer if the buffer is full, and returning the new buffer index
*/
private static int addToBuffer(Writer out, char[] buffer, int bufferIndex, int bufferLength, char ch) throws IOException {
if (bufferIndex >= bufferLength) {
out.write(buffer, 0, bufferIndex);
bufferIndex = 0;
}
buffer[bufferIndex] = ch;
return bufferIndex + 1;
}
/**
* Add an array of characters to the buffer, flushing the buffer if the buffer is full, and returning the new buffer
* index.
*/
private static int addToBuffer(Writer out, char[] buffer, int bufferIndex, int bufferLength, char[] toAdd) throws IOException {
if (bufferIndex >= bufferLength || toAdd.length + bufferIndex >= bufferLength) {
out.write(buffer, 0, bufferIndex);
bufferIndex = 0;
}
System.arraycopy(toAdd, 0, buffer, bufferIndex, toAdd.length);
return bufferIndex + toAdd.length;
}
/**
* Flush the contents of the buffer to the output stream and return the reset buffer index
*/
private static int flushBuffer(Writer out, char[] buffer, int bufferIndex) throws IOException {
if (bufferIndex > 0) {
out.write(buffer, 0, bufferIndex);
}
return 0;
}
private HtmlUtils() {
}
/**
* Writes a string into URL-encoded format out to a Writer.
*
* All characters before the start of the query string will be encoded using UTF-8.
*
* Characters after the start of the query string will be encoded using a client-defined encoding. You'll need to use
* the encoding that the server will expect. (HTML forms will generate query strings using the character encoding that
* the HTML itself was generated in.)
*
* All characters will be encoded as needed for URLs, with the exception of the percent symbol ("%"). Because this is
* the character itself used for escaping, attempting to escape this character would cause this code to double-escape
* some strings. It also may be necessary to pre-escape some characters. In particular, a question mark ("?") is
* considered the start of the query string.
*
*
*
* NOTE: This is method is duplicated below. The difference being the acceptance of a char[] for the text to write. Any
* changes made here, should be made below.
*
*
* @param out a Writer for the output
* @param text the unencoded (or partially encoded) String
* @param queryEncoding the character set encoding for after the first question mark
*/
static public void writeURL(Writer out, String text, char[] textBuff, String queryEncoding) throws IOException, UnsupportedEncodingException {
int length = text.length();
if (length >= 16) {
text.getChars(0, length, textBuff, 0);
writeURL(out, textBuff, 0, length, queryEncoding);
} else {
for (int i = 0; i < length; i++) {
char ch = text.charAt(i);
if (ch < 33 || ch > 126) {
if (ch == ' ') {
out.write('+');
} else {
textBuff[i] = ch;
encodeURIString(out, textBuff, "UTF-8", i, i + 1);
}
}
// DO NOT encode '%'. If you do, then for starters,
// we'll double-encode anything that's pre-encoded.
// And, what's worse, there becomes no way to use
// characters that must be encoded if you
// don't want them to be interpreted, like '?' or '&'.
// else if('%' == ch)
// {
// writeURIDoubleHex(out, ch);
// }
else if (ch == '"') {
out.write("%22");
}
// Everything in the query parameters will be decoded
// as if it were in the request's character set. So use
// the real encoding for those!
else if (ch == '?') {
out.write('?');
encodeURIString(out, text, queryEncoding, i + 1);
return;
} else {
out.write(ch);
}
}
}
}
/**
* Writes a string into URL-encoded format out to a Writer.
*
* All characters before the start of the query string will be encoded using UTF-8.
*
* Characters after the start of the query string will be encoded using a client-defined encoding. You'll need to use
* the encoding that the server will expect. (HTML forms will generate query strings using the character encoding that
* the HTML itself was generated in.)
*
* All characters will be encoded as needed for URLs, with the exception of the percent symbol ("%"). Because this is
* the character itself used for escaping, attempting to escape this character would cause this code to double-escape
* some strings. It also may be necessary to pre-escape some characters. In particular, a question mark ("?") is
* considered the start of the query string.
*
*
* NOTE: This is method is duplicated above. The difference being the acceptance of a String for the text to write. Any
* changes made here, should be made above.
*
*
* @param out a Writer for the output
* @param textBuff char[] containing the content to write
* @param queryEncoding the character set encoding for after the first question mark
*/
static public void writeURL(Writer out, char[] textBuff, int start, int len, String queryEncoding) throws IOException, UnsupportedEncodingException {
int end = start + len;
for (int i = start; i < end; i++) {
char ch = textBuff[i];
if (ch < 33 || ch > 126) {
encodeURIString(out, textBuff, "UTF-8", i, i + 1);
}
// DO NOT encode '%'. If you do, then for starters,
// we'll double-encode anything that's pre-encoded.
// And, what's worse, there becomes no way to use
// characters that must be encoded if you
// don't want them to be interpreted, like '?' or '&'.
// else if('%' == ch)
// {
// writeURIDoubleHex(out, ch);
// }
else if (ch == '"') {
out.write("%22");
}
// Everything in the query parameters will be decoded
// as if it were in the request's character set. So use
// the real encoding for those!
else if (ch == '?') {
out.write('?');
encodeURIString(out, textBuff, queryEncoding, i + 1, end);
return;
} else {
out.write(ch);
}
}
}
static public void writeTextForXML(Writer out, String text, char[] outbuf) throws IOException {
char[] textBuffer = new char[128];
int len = text.length();
if (textBuffer.length < len) {
textBuffer = new char[len * 2];
}
HtmlUtils.writeText(out, true, true, outbuf, text, textBuffer, true);
}
static public void writeUnescapedTextForXML(Writer out, String text) throws IOException {
final int length = text.length();
for (int i = 0; i < length; i++) {
final char ch = text.charAt(i);
if (isAllowedXmlCharacter(ch)) {
out.write(ch);
}
}
}
// Encode a String into URI-encoded form. This code will
// appear rather (ahem) similar to java.net.URLEncoder
// This is duplicated below accepting a char[] for the content
// to write. Any changes here, should be made there as well.
static private void encodeURIString(Writer out, String text, String encoding, int start) throws IOException {
MyByteArrayOutputStream buf = null;
OutputStreamWriter writer = null;
char[] charArray = null;
int length = text.length();
for (int i = start; i < length; i++) {
char ch = text.charAt(i);
if (DONT_ENCODE_SET.get(ch)) {
if (ch == '&') {
if (i + 1 < length && isAmpEscaped(text, i + 1)) {
out.write(ch);
continue;
}
out.write(AMP_CHARS);
} else {
out.write(ch);
}
} else {
if (buf == null) {
buf = new MyByteArrayOutputStream(MAX_BYTES_PER_CHAR);
if (encoding != null) {
writer = new OutputStreamWriter(buf, encoding);
} else {
writer = new OutputStreamWriter(buf, RIConstants.CHAR_ENCODING);
}
charArray = new char[1];
}
// convert to external encoding before hex conversion
try {
// An inspection of OutputStreamWriter reveals
// that write(char) always allocates a one element
// character array. We can reuse our own.
charArray[0] = ch;
writer.write(charArray, 0, 1);
writer.flush();
} catch (IOException e) {
buf.reset();
continue;
}
byte[] ba = buf.getBuf();
for (int j = 0, size = buf.size(); j < size; j++) {
writeURIDoubleHex(out, ba[j] + 256);
}
buf.reset();
}
}
}
// Encode a String into URI-encoded form. This code will
// appear rather (ahem) similar to java.net.URLEncoder
// This is duplicated above accepting a String for the content
// to write. Any changes here, should be made there as well.
static private void encodeURIString(Writer out, char[] textBuff, String encoding, int start, int end) throws IOException {
MyByteArrayOutputStream buf = null;
OutputStreamWriter writer = null;
char[] charArray = null;
for (int i = start; i < end; i++) {
char ch = textBuff[i];
if (DONT_ENCODE_SET.get(ch)) {
if (ch == '&') {
if (i + 1 < end && isAmpEscaped(textBuff, i + 1)) {
out.write(ch);
continue;
}
out.write(AMP_CHARS);
} else {
out.write(ch);
}
} else {
if (buf == null) {
buf = new MyByteArrayOutputStream(MAX_BYTES_PER_CHAR);
if (encoding != null) {
writer = new OutputStreamWriter(buf, encoding);
} else {
writer = new OutputStreamWriter(buf, RIConstants.CHAR_ENCODING);
}
charArray = new char[1];
}
// convert to external encoding before hex conversion
try {
// An inspection of OutputStreamWriter reveals
// that write(char) always allocates a one element
// character array. We can reuse our own.
charArray[0] = ch;
writer.write(charArray, 0, 1);
writer.flush();
} catch (IOException e) {
buf.reset();
continue;
}
byte[] ba = buf.getBuf();
for (int j = 0, size = buf.size(); j < size; j++) {
writeURIDoubleHex(out, ba[j] + 256);
}
buf.reset();
}
}
}
// NOTE: Any changes made to this method should be made
// in the associated method that accepts a char[] instead
// of String
static private boolean isAmpEscaped(String text, int idx) {
for (int i = 1, ix = idx; i < AMP_CHARS.length; i++, ix++) {
if (text.charAt(ix) == AMP_CHARS[i]) {
continue;
}
return false;
}
return true;
}
// NOTE: Any changes made to this method should be made
// in the associated method that accepts a String instead
// of char[]
static private boolean isAmpEscaped(char[] text, int idx) {
for (int i = 1, ix = idx; i < AMP_CHARS.length; i++, ix++) {
if (text[ix] == AMP_CHARS[i]) {
continue;
}
return false;
}
return true;
}
static private void writeURIDoubleHex(Writer out, int i) throws IOException {
out.write('%');
out.write(intToHex((i >> 4) % 0x10));
out.write(intToHex(i % 0x10));
}
static private char intToHex(int i) {
if (i < 10) {
return (char) ('0' + i);
} else {
return (char) ('A' + (i - 10));
}
}
static private final char[] AMP_CHARS = "&".toCharArray();
static private final char[] QUOT_CHARS = """.toCharArray();
static private final char[] GT_CHARS = ">".toCharArray();
static private final char[] LT_CHARS = "<".toCharArray();
static private final char[] EURO_CHARS = "€".toCharArray();
static private final char[] DEC_REF_START = "&#".toCharArray();
static private final int MAX_BYTES_PER_CHAR = 10;
static private final BitSet DONT_ENCODE_SET = new BitSet(256);
// See: http://www.ietf.org/rfc/rfc2396.txt
// We're not fully along for that ride either, but we do encode
// ' ' as '%20', and don't bother encoding '~' or '/'
static {
for (int i = 'a'; i <= 'z'; i++) {
DONT_ENCODE_SET.set(i);
}
for (int i = 'A'; i <= 'Z'; i++) {
DONT_ENCODE_SET.set(i);
}
for (int i = '0'; i <= '9'; i++) {
DONT_ENCODE_SET.set(i);
}
// Don't encode '%' - we don't want to double encode anything.
DONT_ENCODE_SET.set('%');
// Ditto for '+', which is an encoded space
DONT_ENCODE_SET.set('+');
DONT_ENCODE_SET.set('#');
DONT_ENCODE_SET.set('&');
DONT_ENCODE_SET.set('=');
DONT_ENCODE_SET.set('-');
DONT_ENCODE_SET.set('_');
DONT_ENCODE_SET.set('.');
DONT_ENCODE_SET.set('*');
DONT_ENCODE_SET.set('~');
DONT_ENCODE_SET.set('/');
DONT_ENCODE_SET.set('\'');
DONT_ENCODE_SET.set('!');
DONT_ENCODE_SET.set('(');
DONT_ENCODE_SET.set(')');
DONT_ENCODE_SET.set(';');
}
//
// Entities from HTML 4.0, section 24.2.1; character codes 0xA0 to 0xFF
//
static private char[][] sISO8859_1_Entities = new char[][] { " ".toCharArray(), "¡".toCharArray(), "¢".toCharArray(),
"£".toCharArray(), "¤".toCharArray(), "¥".toCharArray(), "¦".toCharArray(), "§".toCharArray(), "¨".toCharArray(),
"©".toCharArray(), "ª".toCharArray(), "«".toCharArray(), "¬".toCharArray(), "".toCharArray(), "®".toCharArray(),
"¯".toCharArray(), "°".toCharArray(), "±".toCharArray(), "²".toCharArray(), "³".toCharArray(), "´".toCharArray(),
"µ".toCharArray(), "¶".toCharArray(), "·".toCharArray(), "¸".toCharArray(), "¹".toCharArray(), "º".toCharArray(),
"»".toCharArray(), "¼".toCharArray(), "½".toCharArray(), "¾".toCharArray(), "¿".toCharArray(),
"À".toCharArray(), "Á".toCharArray(), "Â".toCharArray(), "Ã".toCharArray(), "Ä".toCharArray(),
"Å".toCharArray(), "Æ".toCharArray(), "Ç".toCharArray(), "È".toCharArray(), "É".toCharArray(),
"Ê".toCharArray(), "Ë".toCharArray(), "Ì".toCharArray(), "Í".toCharArray(), "Î".toCharArray(),
"Ï".toCharArray(), "Ð".toCharArray(), "Ñ".toCharArray(), "Ò".toCharArray(), "Ó".toCharArray(),
"Ô".toCharArray(), "Õ".toCharArray(), "Ö".toCharArray(), "×".toCharArray(), "Ø".toCharArray(),
"Ù".toCharArray(), "Ú".toCharArray(), "Û".toCharArray(), "Ü".toCharArray(), "Ý".toCharArray(),
"Þ".toCharArray(), "ß".toCharArray(), "à".toCharArray(), "á".toCharArray(), "â".toCharArray(),
"ã".toCharArray(), "ä".toCharArray(), "å".toCharArray(), "æ".toCharArray(), "ç".toCharArray(),
"è".toCharArray(), "é".toCharArray(), "ê".toCharArray(), "ë".toCharArray(), "ì".toCharArray(),
"í".toCharArray(), "î".toCharArray(), "ï".toCharArray(), "ð".toCharArray(), "ñ".toCharArray(),
"ò".toCharArray(), "ó".toCharArray(), "ô".toCharArray(), "õ".toCharArray(), "ö".toCharArray(),
"÷".toCharArray(), "ø".toCharArray(), "ù".toCharArray(), "ú".toCharArray(), "û".toCharArray(),
"ü".toCharArray(), "ý".toCharArray(), "þ".toCharArray(), "ÿ".toCharArray() };
// ----------------------------------------------------------
// The following is used to verify encodings
// ----------------------------------------------------------
//
static public boolean validateEncoding(String encoding) {
return Charset.isSupported(encoding);
}
// ----------------------------------------------------------
// Check if the given encoding is the ISO-8859-1 encoding
// ----------------------------------------------------------
//
static public boolean isISO8859_1encoding(String encoding) {
return "ISO-8859-1".equals(encoding);
}
// ----------------------------------------------------------
// Check if the given encoding is a UTF encoding
// ----------------------------------------------------------
//
static public boolean isUTFencoding(String encoding) {
return UTF_CHARSET.contains(encoding);
}
// ----------------------------------------------------------
// The following is used to verify "empty" Html elements.
// "Empty" Html elements are those that do not require an
// ending tag. For example,
or
...
// ----------------------------------------------------------
static public boolean isEmptyElement(String name) {
char firstChar = name.charAt(0);
if (firstChar > _LAST_EMPTY_ELEMENT_START) {
return false;
}
// Can we improve performance here? It's certainly slower to use
// a HashMap, at least if we can't assume the input name is lowercased.
String[] array = emptyElementArr[firstChar];
if (array != null) {
for (int i = array.length - 1; i >= 0; i--) {
if (name.equalsIgnoreCase(array[i])) {
return true;
}
}
}
return false;
}
static private char _LAST_EMPTY_ELEMENT_START = 'p';
static private String[][] emptyElementArr = new String[_LAST_EMPTY_ELEMENT_START + 1][];
static private String[] aNames = new String[] { "area", };
static private String[] bNames = new String[] { "br", "base", "basefont", };
static private String[] cNames = new String[] { "col", };
static private String[] fNames = new String[] { "frame", };
static private String[] hNames = new String[] { "hr", };
static private String[] iNames = new String[] { "img", "input", "isindex", };
static private String[] lNames = new String[] { "link", };
static private String[] mNames = new String[] { "meta", };
static private String[] pNames = new String[] { "param", };
static {
emptyElementArr['a'] = aNames;
emptyElementArr['A'] = aNames;
emptyElementArr['b'] = bNames;
emptyElementArr['B'] = bNames;
emptyElementArr['c'] = cNames;
emptyElementArr['C'] = cNames;
emptyElementArr['f'] = fNames;
emptyElementArr['F'] = fNames;
emptyElementArr['h'] = hNames;
emptyElementArr['H'] = hNames;
emptyElementArr['i'] = iNames;
emptyElementArr['I'] = iNames;
emptyElementArr['l'] = lNames;
emptyElementArr['L'] = lNames;
emptyElementArr['m'] = mNames;
emptyElementArr['M'] = mNames;
emptyElementArr['p'] = pNames;
emptyElementArr['P'] = pNames;
}
// ----------------------------------------------------------- Inner Classes
/**
*
* Private implementation of ByteArrayOutputStream.
*
*/
private static class MyByteArrayOutputStream extends ByteArrayOutputStream {
public MyByteArrayOutputStream(int initialCapacity) {
super(initialCapacity);
}
/**
* Obtain access to the underlying byte array to prevent unecessary temp object creation.
*
* @return buf
*/
public byte[] getBuf() {
return buf;
}
}
}