com.itextpdf.text.pdf.PdfString Maven / Gradle / Ivy
/*
* $Id: 177e790c73cc4982059aa0c24edccc724de1afa0 $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2016 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: [email protected]
*/
package com.itextpdf.text.pdf;
import com.itextpdf.text.pdf.internal.PdfIsoKeys;
import java.io.IOException;
import java.io.OutputStream;
/**
* A PdfString-class is the PDF-equivalent of a
* JAVA-String-object.
*
* A string is a sequence of characters delimited by parenthesis.
* If a string is too long to be conveniently placed on a single line, it may
* be split across multiple lines by using the backslash character (\) at the
* end of a line to indicate that the string continues on the following line.
* Within a string, the backslash character is used as an escape to specify
* unbalanced parenthesis, non-printing ASCII characters, and the backslash
* character itself. Use of the \ddd escape sequence is the preferred
* way to represent characters outside the printable ASCII character set.
* This object is described in the 'Portable Document Format Reference Manual
* version 1.7' section 3.2.3 (page 53-56).
*
* @see PdfObject
* @see BadPdfFormatException
*/
public class PdfString extends PdfObject {
// CLASS VARIABLES
/** The value of this object. */
protected String value = NOTHING;
protected String originalValue = null;
/** The encoding. */
protected String encoding = TEXT_PDFDOCENCODING;
protected int objNum = 0;
protected int objGen = 0;
protected boolean hexWriting = false;
// CONSTRUCTORS
/**
* Constructs an empty PdfString-object.
*/
public PdfString() {
super(STRING);
}
/**
* Constructs a PdfString-object containing a string in the
* standard encoding TEXT_PDFDOCENCODING.
*
* @param value the content of the string
*/
public PdfString(String value) {
super(STRING);
this.value = value;
}
/**
* Constructs a PdfString-object containing a string in the
* specified encoding.
*
* @param value the content of the string
* @param encoding an encoding
*/
public PdfString(String value, String encoding) {
super(STRING);
this.value = value;
this.encoding = encoding;
}
/**
* Constructs a PdfString-object.
*
* @param bytes an array of byte
*/
public PdfString(byte[] bytes) {
super(STRING);
value = PdfEncodings.convertToString(bytes, null);
encoding = NOTHING;
}
// methods overriding some methods in PdfObject
/**
* Writes the PDF representation of this PdfString as an array
* of byte to the specified OutputStream.
*
* @param writer for backwards compatibility
* @param os The OutputStream to write the bytes to.
*/
public void toPdf(PdfWriter writer, OutputStream os) throws IOException {
PdfWriter.checkPdfIsoConformance(writer, PdfIsoKeys.PDFISOKEY_OBJECT, this);
byte b[] = getBytes();
PdfEncryption crypto = null;
if (writer != null)
crypto = writer.getEncryption();
if (crypto != null && !crypto.isEmbeddedFilesOnly())
b = crypto.encryptByteArray(b);
if (hexWriting) {
ByteBuffer buf = new ByteBuffer();
buf.append('<');
int len = b.length;
for (int k = 0; k < len; ++k)
buf.appendHex(b[k]);
buf.append('>');
os.write(buf.toByteArray());
}
else
os.write(StringUtils.escapeString(b));
}
/**
* Returns the String value of this PdfString-object.
*
* @return A String
*/
public String toString() {
return value;
}
public byte[] getBytes() {
if (bytes == null) {
if (encoding != null && encoding.equals(TEXT_UNICODE) && PdfEncodings.isPdfDocEncoding(value))
bytes = PdfEncodings.convertToBytes(value, TEXT_PDFDOCENCODING);
else
bytes = PdfEncodings.convertToBytes(value, encoding);
}
return bytes;
}
// other methods
/**
* Returns the Unicode String value of this
* PdfString-object.
*
* @return A String
*/
public String toUnicodeString() {
if (encoding != null && encoding.length() != 0)
return value;
getBytes();
if (bytes.length >= 2 && bytes[0] == (byte)254 && bytes[1] == (byte)255)
return PdfEncodings.convertToString(bytes, PdfObject.TEXT_UNICODE);
else
return PdfEncodings.convertToString(bytes, PdfObject.TEXT_PDFDOCENCODING);
}
/**
* Gets the encoding of this string.
*
* @return a String
*/
public String getEncoding() {
return encoding;
}
void setObjNum(int objNum, int objGen) {
this.objNum = objNum;
this.objGen = objGen;
}
/**
* Decrypt an encrypted PdfString
*/
void decrypt(PdfReader reader) {
PdfEncryption decrypt = reader.getDecrypt();
if (decrypt != null) {
originalValue = value;
decrypt.setHashKey(objNum, objGen);
bytes = PdfEncodings.convertToBytes(value, null);
bytes = decrypt.decryptByteArray(bytes);
value = PdfEncodings.convertToString(bytes, null);
}
}
public byte[] getOriginalBytes() {
if (originalValue == null)
return getBytes();
return PdfEncodings.convertToBytes(originalValue, null);
}
public PdfString setHexWriting(boolean hexWriting) {
this.hexWriting = hexWriting;
return this;
}
public boolean isHexWriting() {
return hexWriting;
}
}