/*
* Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Nam Nguyen
*/
package com.caucho.quercus.lib.i18n;
import com.caucho.quercus.env.Env;
import com.caucho.quercus.env.StringValue;
public class Utf8Encoder
extends Encoder
{
public Utf8Encoder(String charset)
{
super(charset);
}
@Override
public boolean isUtf8()
{
return true;
}
public boolean isEncodable(Env env, StringValue str)
{
int len = str.length();
for (int i = 0; i < len; i++) {
char ch = str.charAt(i);
if (ch <= 0x7F)
continue;
if ('\uD800' <= ch && ch <= '\uDBFF') {
char ch2;
if (i + 1 < len
&& '\uDC00' <= (ch2 = str.charAt(i + 1)) && ch2 <= '\uDFFF') {
i++;
}
else
return false;
}
}
return true;
}
@Override
public StringValue encode(Env env, CharSequence str)
{
StringValue sb = env.createBinaryBuilder();
int len = str.length();
for (int i = 0; i < len; i++) {
char ch = str.charAt(i);
if (ch <= 0x7F) {
sb.appendByte(ch);
continue;
}
int code = ch;
if ('\uD800' <= ch && ch <= '\uDBFF') {
char ch2;
if (i + 1 < len
&& '\uDC00' <= (ch2 = str.charAt(i + 1)) && ch2 <= '\uDFFF') {
i++;
code = 0x10000 + ((code & 0xFF) << 8);
code = code + (ch2 & 0xFF);
}
else {
if (_isIgnore) {
}
else if (_replacement != null)
sb.append(_replacement);
else
return sb;
continue;
}
}
if (0x80 <= code && code <= 0x7FF) {
sb.appendByte(0xC0 | (code >> 6));
sb.appendByte(0x80 | (code & 0x3F));
}
else if (0x800 <= code && code <= 0xFFFF) {
sb.appendByte(0xE0 | (code >> 12));
sb.appendByte(0x80 | ((code >> 6) & 0x3F));
sb.appendByte(0x80 | (code & 0x3F));
}
else {
sb.appendByte(0xF0 | (code >> 18));
sb.appendByte(0x80 | ((code >> 12) & 0x3F));
sb.appendByte(0x80 | ((code >> 6) & 0x3F));
sb.appendByte(0x80 | (code & 0x3F));
}
}
return sb;
}
}