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Code Issues Releases Wiki Activity

Unify StringUtils.escapeForXML()

Browse source 
Rework StringUtils.escapeForXML() so that it can be used also for
StringUtils.xmlAttribEncodeBinary(). escapeForXML() now uses a
switch/case statement, which should leave the (JIT) compiler more room
for optimizations.

Removing the "do not escape unicode character references", because
this behavior, introduced with
8264ebdfb5, is incorrect.
This commit is contained in:
Florian Schmaus 2014-03-18 18:40:08 +01:00
parent c592b4f046
commit dbab9b8995
1 changed files with 49 additions and 84 deletions
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133
core/src/main/java/org/jivesoftware/smack/util/StringUtils.java
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@ -30,11 +30,11 @@ import java.util.logging.Logger;
public class StringUtils {
private static final Logger LOGGER = Logger.getLogger(StringUtils.class.getName());
private static final char[] QUOTE_ENCODE = """.toCharArray();
private static final char[] APOS_ENCODE = "'".toCharArray();
private static final char[] AMP_ENCODE = "&".toCharArray();
private static final char[] LT_ENCODE = "<".toCharArray();
private static final char[] GT_ENCODE = ">".toCharArray();
public static final String QUOTE_ENCODE = """;
public static final String APOS_ENCODE = "'";
public static final String AMP_ENCODE = "&";
public static final String LT_ENCODE = "<";
public static final String GT_ENCODE = ">";
/**
* Returns the name portion of a XMPP address. For example, for the
@ -283,34 +283,6 @@ public class StringUtils {
return buf.toString();
}
/**
* Encodes a string for use in an XML attribute by escaping characters with
* a special meaning. In particular, white spaces are encoded as character
* references, such that they are not replaced by ' ' on parsing.
*/
private static String xmlAttribEncodeBinary(String value) {
StringBuilder s = new StringBuilder();
char buf[] = value.toCharArray();
for (char c : buf) {
switch (c) {
case '<': s.append("&lt;"); break;
case '>': s.append("&gt;"); break;
case '&': s.append("&amp;"); break;
case '"': s.append("&quot;"); break;
case '\'': s.append("&apos;"); break;
default:
if (c <= 0x1f || (0x7f <= c && c <= 0x9f)) { // includes \t, \n, \r
s.append("&#x");
s.append(String.format("%X", (int)c));
s.append(';');
} else {
s.append(c);
}
}
}
return s.toString();
}
/**
* Returns a string representing a XML attribute. The value parameter is escaped as necessary. In particular,
* white spaces are encoded as character references, such that they are not replaced by ' ' on parsing.
@ -318,7 +290,7 @@ public class StringUtils {
* @param value value of the XML attribute
*/
public static String xmlAttrib(String name, String value) {
return name + "=\"" + xmlAttribEncodeBinary(value) + "\"";
return name + "=\"" + escapeForXML(value, true) + "\"";
}
@ -326,69 +298,62 @@ public class StringUtils {
* Escapes all necessary characters in the String so that it can be used
* in an XML doc.
*
* <strong>Warning:</strong> This method does not escape unicode character references
* (i.e. references of the from &#235;)
*
* @param string the string to escape.
* @return the string with appropriate characters escaped.
*/
public static String escapeForXML(String string) {
return escapeForXML(string, false);
}
public static String escapeForXML(final String string, final boolean escapeWhitespace) {
if (string == null) {
return null;
}
final char[] input = string.toCharArray();
final int len = input.length;
final StringBuilder out = new StringBuilder((int)(len*1.3));
CharSequence toAppend;
char ch;
int i=0;
int last=0;
char[] input = string.toCharArray();
int len = input.length;
StringBuilder out = new StringBuilder((int)(len*1.3));
for (; i < len; i++) {
int last = 0;
int i = 0;
while (i < len) {
toAppend = null;
ch = input[i];
if (ch > '>') {
switch(ch) {
case '<':
toAppend = LT_ENCODE;
break;
case '>':
toAppend = GT_ENCODE;
break;
case '&':
toAppend = AMP_ENCODE;
break;
case '"':
toAppend = QUOTE_ENCODE;
break;
case '\'':
toAppend = APOS_ENCODE;
break;
default:
// includes \t, \n, \r
if (escapeWhitespace && (ch <= 0x1f || (0x7f <= ch && ch <= 0x9f))) {
StringBuilder sb = new StringBuilder();
sb.append("&#x");
sb.append(String.format("%X", (int) ch));
sb.append(';');
toAppend = sb;
}
break;
}
else if (ch == '<') {
if (toAppend != null) {
if (i > last) {
out.append(input, last, i - last);
}
last = i + 1;
out.append(LT_ENCODE);
}
else if (ch == '>') {
if (i > last) {
out.append(input, last, i - last);
}
last = i + 1;
out.append(GT_ENCODE);
}
else if (ch == '&') {
if (i > last) {
out.append(input, last, i - last);
}
// Do nothing if the string is of the form &#235; (unicode value)
if (!(len > i + 5
&& input[i + 1] == '#'
&& Character.isDigit(input[i + 2])
&& Character.isDigit(input[i + 3])
&& Character.isDigit(input[i + 4])
&& input[i + 5] == ';')) {
last = i + 1;
out.append(AMP_ENCODE);
}
}
else if (ch == '"') {
if (i > last) {
out.append(input, last, i - last);
}
last = i + 1;
out.append(QUOTE_ENCODE);
}
else if (ch == '\'') {
if (i > last) {
out.append(input, last, i - last);
}
last = i + 1;
out.append(APOS_ENCODE);
out.append(toAppend);
last = ++i;
} else {
i++;
}
}
if (last == 0) {