Drop Encoding.toAsciiLowerCase; use toLowerCase()

This change drops the Encoding.toAsciiLowerCase() method and replaces
calls to it with calls to string.toLowerCase() — because none of the
conforming encoding names have any special characters for which the
behavior of Encoding.toAsciiLowerCase() would produce any different
results than string.toLowerCase() does.

Author: sideshowbarker

src/nu/validator/htmlparser/io/Driver.java

@@ -336,7 +336,7 @@ public void setEncoding(Encoding encoding, Confidence confidence) {
     public boolean internalEncodingDeclaration(String internalCharset)
             throws SAXException {
         try {
-            internalCharset = Encoding.toAsciiLowerCase(internalCharset);
+            internalCharset = internalCharset.toLowerCase();
             Encoding cs;
             if ("utf-16".equals(internalCharset)
                     || "utf-16be".equals(internalCharset)
@@ -428,7 +428,7 @@ protected Encoding encodingFromExternalDeclaration(String encoding)
         if (encoding == null) {
             return null;
         }
-        encoding = Encoding.toAsciiLowerCase(encoding);
+        encoding = encoding.toLowerCase();
         try {
             Encoding cs = Encoding.forName(encoding);
             if ("utf-16".equals(cs.getCanonName())

src/nu/validator/htmlparser/io/Encoding.java

@@ -425,21 +425,6 @@ public static String toNameKey(String str) {
         return new String(buf, 0, j);
     }
 
-    public static String toAsciiLowerCase(String str) {
-        if (str == null) {
-            return null;
-        }
-        char[] buf = new char[str.length()];
-        for (int i = 0; i < str.length(); i++) {
-            char c = str.charAt(i);
-            if (c >= 'A' && c <= 'Z') {
-                c += 0x20;
-            }
-            buf[i] = c;
-        }
-        return new String(buf);
-    }
-
     /**
      * @param canonName
      * @param charset

src/nu/validator/htmlparser/io/MetaSniffer.java

@@ -159,7 +159,7 @@ public String getEncoding() {
     }
 
     protected boolean tryCharset(String encoding) throws SAXException {
-        encoding = Encoding.toAsciiLowerCase(encoding);
+        encoding = encoding.toLowerCase();
         try {
             // XXX spec says only UTF-16
             if ("utf-16".equals(encoding) || "utf-16be".equals(encoding) || "utf-16le".equals(encoding) || "utf-32".equals(encoding) || "utf-32be".equals(encoding) || "utf-32le".equals(encoding)) {