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Devin Jankowski
2023-06-21 12:46:23 -04:00
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iTechSharp/iTextSharp/text/pdf/PdfObject.cs Normal file
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/*
* $Id: PdfObject.cs,v 1.3 2008/05/13 11:25:21 psoares33 Exp $
*
*
* Copyright 1999, 2000, 2001, 2002 Bruno Lowagie
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (the "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library 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 Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/
using System;
using System.IO;
namespace iTextSharp.text.pdf {
/**
* <CODE>PdfObject</CODE> is the abstract baseclass of all PDF objects.
* <P>
* PDF supports seven basic types of objects: bools, numbers, strings, names,
* arrays, dictionaries and streams. In addition, PDF provides a null object.
* Objects may be labeled so that they can be referred to by other objects.<BR>
* All these basic PDF objects are described in the 'Portable Document Format
* Reference Manual version 1.3' Chapter 4 (pages 37-54).
*
* @see PdfNull
* @see Pdfbool
* @see PdfNumber
* @see PdfString
* @see PdfName
* @see PdfArray
* @see PdfDictionary
* @see PdfStream
* @see PdfIndirectReference
*/
public abstract class PdfObject {
// static membervariables (all the possible types of a PdfObject)
/** a possible type of <CODE>PdfObject</CODE> */
public const int BOOLEAN = 1;
/** a possible type of <CODE>PdfObject</CODE> */
public const int NUMBER = 2;
/** a possible type of <CODE>PdfObject</CODE> */
public const int STRING = 3;
/** a possible type of <CODE>PdfObject</CODE> */
public const int NAME = 4;
/** a possible type of <CODE>PdfObject</CODE> */
public const int ARRAY = 5;
/** a possible type of <CODE>PdfObject</CODE> */
public const int DICTIONARY = 6;
/** a possible type of <CODE>PdfObject</CODE> */
public const int STREAM = 7;
/** a possible type of <CODE>PdfObject</CODE> */
public const int NULL = 8;
/** a possible type of <CODE>PdfObject</CODE> */
public const int INDIRECT = 10;
/** This is an empty string used for the <CODE>PdfNull</CODE>-object and for an empty <CODE>PdfString</CODE>-object. */
public const string NOTHING = "";
/** This is the default encoding to be used for converting strings into bytes and vice versa.
* The default encoding is PdfDocEcoding.
*/
public const string TEXT_PDFDOCENCODING = "PDF";
/** This is the encoding to be used to output text in Unicode. */
public const string TEXT_UNICODE = "UnicodeBig";
// membervariables
/** the content of this <CODE>PdfObject</CODE> */
protected byte[] bytes;
/** the type of this <CODE>PdfObject</CODE> */
protected int type;
/**
* Holds value of property indRef.
*/
protected PRIndirectReference indRef;
// constructors
/**
* Constructs a <CODE>PdfObject</CODE> of a certain <VAR>type</VAR> without any <VAR>content</VAR>.
*
* @param type type of the new <CODE>PdfObject</CODE>
*/
protected PdfObject(int type) {
this.type = type;
}
/**
* Constructs a <CODE>PdfObject</CODE> of a certain <VAR>type</VAR> with a certain <VAR>content</VAR>.
*
* @param type type of the new <CODE>PdfObject</CODE>
* @param content content of the new <CODE>PdfObject</CODE> as a <CODE>String</CODE>.
*/
protected PdfObject(int type, string content) {
this.type = type;
bytes = PdfEncodings.ConvertToBytes(content, null);
}
/**
* Constructs a <CODE>PdfObject</CODE> of a certain <VAR>type</VAR> with a certain <VAR>content</VAR>.
*
* @param type type of the new <CODE>PdfObject</CODE>
* @param bytes content of the new <CODE>PdfObject</CODE> as an array of <CODE>byte</CODE>.
*/
protected PdfObject(int type, byte[] bytes) {
this.bytes = bytes;
this.type = type;
}
// methods dealing with the content of this object
/**
* Writes the PDF representation of this <CODE>PdfObject</CODE> as an array of <CODE>byte</CODE>s to the writer.
* @param writer for backwards compatibility
* @param os the outputstream to write the bytes to.
* @throws IOException
*/
public virtual void ToPdf(PdfWriter writer, Stream os) {
if (bytes != null)
os.Write(bytes, 0, bytes.Length);
}
/**
* Gets the presentation of this object in a byte array
* @return a byte array
*/
public virtual byte[] GetBytes() {
return bytes;
}
/**
* Can this object be in an object stream?
* @return true if this object can be in an object stream.
*/
public bool CanBeInObjStm() {
return (type >= 1 && type <= 6) || type == 8;
}
/**
* Returns the length of the PDF representation of the <CODE>PdfObject</CODE>.
* <P>
* In some cases, namely for <CODE>PdfString</CODE> and <CODE>PdfStream</CODE>,
* this method differs from the method <CODE>length</CODE> because <CODE>length</CODE>
* returns the length of the actual content of the <CODE>PdfObject</CODE>.</P>
* <P>
* Remark: the actual content of an object is in most cases identical to its representation.
* The following statement is always true: Length() &gt;= PdfLength().</P>
*
* @return a length
*/
// public int PdfLength() {
// return ToPdf(null).length;
// }
/**
* Returns the <CODE>String</CODE>-representation of this <CODE>PdfObject</CODE>.
*
* @return a <CODE>String</CODE>
*/
public override string ToString() {
if (bytes == null)
return "";
else
return PdfEncodings.ConvertToString(bytes, null);
}
/**
* Returns the length of the actual content of the <CODE>PdfObject</CODE>.
* <P>
* In some cases, namely for <CODE>PdfString</CODE> and <CODE>PdfStream</CODE>,
* this method differs from the method <CODE>pdfLength</CODE> because <CODE>pdfLength</CODE>
* returns the length of the PDF representation of the object, not of the actual content
* as does the method <CODE>length</CODE>.</P>
* <P>
* Remark: the actual content of an object is in some cases identical to its representation.
* The following statement is always true: Length() &gt;= PdfLength().</P>
*
* @return a length
*/
public int Length {
get {
return ToString().Length;
}
}
/**
* Changes the content of this <CODE>PdfObject</CODE>.
*
* @param content the new content of this <CODE>PdfObject</CODE>
*/
protected string Content {
set {
bytes = PdfEncodings.ConvertToBytes(value, null);
}
}
// methods dealing with the type of this object
/**
* Returns the type of this <CODE>PdfObject</CODE>.
*
* @return a type
*/
public int Type {
get {
return type;
}
}
/**
* Checks if this <CODE>PdfObject</CODE> is of the type <CODE>PdfNull</CODE>.
*
* @return <CODE>true</CODE> or <CODE>false</CODE>
*/
public bool IsNull() {
return (this.type == NULL);
}
/**
* Checks if this <CODE>PdfObject</CODE> is of the type <CODE>PdfBoolean</CODE>.
*
* @return <CODE>true</CODE> or <CODE>false</CODE>
*/
public bool IsBoolean() {
return (this.type == BOOLEAN);
}
/**
* Checks if this <CODE>PdfObject</CODE> is of the type <CODE>PdfNumber</CODE>.
*
* @return <CODE>true</CODE> or <CODE>false</CODE>
*/
public bool IsNumber() {
return (this.type == NUMBER);
}
/**
* Checks if this <CODE>PdfObject</CODE> is of the type <CODE>PdfString</CODE>.
*
* @return <CODE>true</CODE> or <CODE>false</CODE>
*/
public bool IsString() {
return (this.type == STRING);
}
/**
* Checks if this <CODE>PdfObject</CODE> is of the type <CODE>PdfName</CODE>.
*
* @return <CODE>true</CODE> or <CODE>false</CODE>
*/
public bool IsName() {
return (this.type == NAME);
}
/**
* Checks if this <CODE>PdfObject</CODE> is of the type <CODE>PdfArray</CODE>.
*
* @return <CODE>true</CODE> or <CODE>false</CODE>
*/
public bool IsArray() {
return (this.type == ARRAY);
}
/**
* Checks if this <CODE>PdfObject</CODE> is of the type <CODE>PdfDictionary</CODE>.
*
* @return <CODE>true</CODE> or <CODE>false</CODE>
*/
public bool IsDictionary() {
return (this.type == DICTIONARY);
}
/**
* Checks if this <CODE>PdfObject</CODE> is of the type <CODE>PdfStream</CODE>.
*
* @return <CODE>true</CODE> or <CODE>false</CODE>
*/
public bool IsStream() {
return (this.type == STREAM);
}
/**
* Checks if this is an indirect object.
* @return true if this is an indirect object
*/
public bool IsIndirect() {
return (this.type == INDIRECT);
}
public PRIndirectReference IndRef {
get {
return indRef;
}
set {
indRef = value;
}
}
}
}