232 lines
8.3 KiB
C#
232 lines
8.3 KiB
C#
using System;
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using System.IO;
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/*
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* $Id: PdfString.cs,v 1.6 2008/05/13 11:25:23 psoares33 Exp $
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*
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*
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* Copyright 1999, 2000, 2001, 2002 Bruno Lowagie
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* (the "License"); you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the License.
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*
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* The Original Code is 'iText, a free JAVA-PDF library'.
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*
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* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
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* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
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* All Rights Reserved.
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* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
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* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
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*
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* Contributor(s): all the names of the contributors are added in the source code
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* where applicable.
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*
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* Alternatively, the contents of this file may be used under the terms of the
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* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
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* provisions of LGPL are applicable instead of those above. If you wish to
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* allow use of your version of this file only under the terms of the LGPL
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* License and not to allow others to use your version of this file under
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* the MPL, indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by the LGPL.
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* If you do not delete the provisions above, a recipient may use your version
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* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the MPL as stated above or under the terms of the GNU
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* Library General Public License as published by the Free Software Foundation;
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* either version 2 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
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* details.
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*
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* If you didn't download this code from the following link, you should check if
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* you aren't using an obsolete version:
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* http://www.lowagie.com/iText/
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*/
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namespace iTextSharp.text.pdf {
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/**
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* A <CODE>PdfString</CODE>-class is the PDF-equivalent of a JAVA-<CODE>string</CODE>-object.
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* <P>
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* A string is a sequence of characters delimited by parenthesis. If a string is too long
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* to be conveniently placed on a single line, it may be split across multiple lines by using
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* the backslash character (\) at the end of a line to indicate that the string continues
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* on the following line. Within a string, the backslash character is used as an escape to
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* specify unbalanced parenthesis, non-printing ASCII characters, and the backslash character
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* itself. Use of the \<I>ddd</I> escape sequence is the preferred way to represent characters
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* outside the printable ASCII character set.<BR>
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* This object is described in the 'Portable Document Format Reference Manual version 1.3'
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* section 4.4 (page 37-39).
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*
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* @see PdfObject
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* @see BadPdfFormatException
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*/
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public class PdfString : PdfObject {
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// membervariables
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/** The value of this object. */
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protected string value = NOTHING;
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protected string originalValue = null;
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/** The encoding. */
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protected string encoding = TEXT_PDFDOCENCODING;
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protected int objNum = 0;
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protected int objGen = 0;
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protected bool hexWriting = false;
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// constructors
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/**
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* Constructs an empty <CODE>PdfString</CODE>-object.
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*/
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public PdfString() : base(STRING) {}
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/**
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* Constructs a <CODE>PdfString</CODE>-object.
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*
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* @param value the content of the string
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*/
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public PdfString(string value) : base(STRING) {
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this.value = value;
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}
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/**
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* Constructs a <CODE>PdfString</CODE>-object.
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*
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* @param value the content of the string
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* @param encoding an encoding
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*/
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public PdfString(string value, string encoding) : base(STRING) {
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this.value = value;
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this.encoding = encoding;
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}
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/**
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* Constructs a <CODE>PdfString</CODE>-object.
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*
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* @param bytes an array of <CODE>byte</CODE>
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*/
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public PdfString(byte[] bytes) : base(STRING) {
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value = PdfEncodings.ConvertToString(bytes, null);
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encoding = NOTHING;
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}
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// methods overriding some methods in PdfObject
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/**
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* Returns the PDF representation of this <CODE>PdfString</CODE>.
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*
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* @return an array of <CODE>byte</CODE>s
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*/
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public override void ToPdf(PdfWriter writer, Stream os) {
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byte[] b = GetBytes();
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PdfEncryption crypto = null;
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if (writer != null)
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crypto = writer.Encryption;
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if (crypto != null) {
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b = crypto.EncryptByteArray(b);
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}
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if (hexWriting) {
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ByteBuffer buf = new ByteBuffer();
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buf.Append('<');
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int len = b.Length;
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for (int k = 0; k < len; ++k)
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buf.AppendHex(b[k]);
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buf.Append('>');
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os.Write(buf.ToByteArray(), 0, buf.Size);
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}
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else {
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b = PdfContentByte.EscapeString(b);
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os.Write(b, 0, b.Length);
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}
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}
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/**
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* Returns the <CODE>string</CODE> value of the <CODE>PdfString</CODE>-object.
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*
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* @return a <CODE>string</CODE>
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*/
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public override string ToString() {
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return value;
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}
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// other methods
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/**
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* Gets the encoding of this string.
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*
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* @return a <CODE>string</CODE>
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*/
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public string Encoding {
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get {
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return encoding;
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}
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}
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public String ToUnicodeString() {
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if (encoding != null && encoding.Length != 0)
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return value;
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GetBytes();
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if (bytes.Length >= 2 && bytes[0] == (byte)254 && bytes[1] == (byte)255)
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return PdfEncodings.ConvertToString(bytes, PdfObject.TEXT_UNICODE);
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else
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return PdfEncodings.ConvertToString(bytes, PdfObject.TEXT_PDFDOCENCODING);
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}
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internal void SetObjNum(int objNum, int objGen) {
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this.objNum = objNum;
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this.objGen = objGen;
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}
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internal void Decrypt(PdfReader reader) {
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PdfEncryption decrypt = reader.Decrypt;
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if (decrypt != null) {
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originalValue = value;
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decrypt.SetHashKey(objNum, objGen);
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bytes = PdfEncodings.ConvertToBytes(value, null);
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bytes = decrypt.DecryptByteArray(bytes);
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value = PdfEncodings.ConvertToString(bytes, null);
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}
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}
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public override byte[] GetBytes() {
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if (bytes == null) {
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if (encoding != null && encoding.Equals(TEXT_UNICODE) && PdfEncodings.IsPdfDocEncoding(value))
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bytes = PdfEncodings.ConvertToBytes(value, TEXT_PDFDOCENCODING);
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else
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bytes = PdfEncodings.ConvertToBytes(value, encoding);
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}
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return bytes;
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}
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public byte[] GetOriginalBytes() {
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if (originalValue == null)
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return GetBytes();
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return PdfEncodings.ConvertToBytes(originalValue, null);
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}
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public PdfString SetHexWriting(bool hexWriting) {
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this.hexWriting = hexWriting;
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return this;
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}
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public bool IsHexWriting() {
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return hexWriting;
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}
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}
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} |