/*
*
* This file is part of the iText (R) project.
Copyright (c) 1998-2017 iText Group NV
* Authors: Bruno Lowagie, Paulo Soares, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
* ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
* OF THIRD PARTY RIGHTS
*
* This program 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 Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: sales@itextpdf.com
*/
package com.itextpdf.text.pdf;
import com.itextpdf.text.DocWriter;
public class StringUtils {
final static private byte[] r = DocWriter.getISOBytes("\\r");
final static private byte[] n = DocWriter.getISOBytes("\\n");
final static private byte[] t = DocWriter.getISOBytes("\\t");
final static private byte[] b = DocWriter.getISOBytes("\\b");
final static private byte[] f = DocWriter.getISOBytes("\\f");
private StringUtils() {
}
/**
* Escapes a <CODE>byte</CODE> array according to the PDF conventions.
*
* @param bytes the <CODE>byte</CODE> array to escape
* @return an escaped <CODE>byte</CODE> array
*/
public static byte[] escapeString(final byte bytes[]) {
ByteBuffer content = new ByteBuffer();
escapeString(bytes, content);
return content.toByteArray();
}
/**
* Escapes a <CODE>byte</CODE> array according to the PDF conventions.
*
* @param bytes the <CODE>byte</CODE> array to escape
* @param content the content
*/
public static void escapeString(final byte bytes[], final ByteBuffer content) {
content.append_i('(');
for (int k = 0; k < bytes.length; ++k) {
byte c = bytes[k];
switch (c) {
case '\r':
content.append(r);
break;
case '\n':
content.append(n);
break;
case '\t':
content.append(t);
break;
case '\b':
content.append(b);
break;
case '\f':
content.append(f);
break;
case '(':
case ')':
case '\\':
content.append_i('\\').append_i(c);
break;
default:
content.append_i(c);
}
}
content.append_i(')');
}
/**
* Converts an array of unsigned 16bit numbers to an array of bytes.
* The input values are presented as chars for convenience.
*
* @param chars the array of 16bit numbers that should be converted
* @return the resulting byte array, twice as large as the input
*/
public static byte[] convertCharsToBytes(char[] chars) {
byte[] result = new byte[chars.length*2];
for (int i=0; i<chars.length;i++) {
result[2*i] = (byte) (chars[i] / 256);
result[2*i+1] = (byte) (chars[i] % 256);
}
return result;
}
}