750 lines
30 KiB
C#
750 lines
30 KiB
C#
#region PDFsharp - A .NET library for processing PDF
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//
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// Authors:
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// Stefan Lange
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//
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// Copyright (c) 2005-2017 empira Software GmbH, Cologne Area (Germany)
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//
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// http://www.pdfsharp.com
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// http://sourceforge.net/projects/pdfsharp
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Collections;
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using PdfSharp.Pdf.IO;
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using PdfSharp.Pdf.Advanced;
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using PdfSharp.Pdf.Annotations;
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namespace PdfSharp.Pdf
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{
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/// <summary>
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/// Represents the pages of the document.
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/// </summary>
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[DebuggerDisplay("(PageCount={Count})")]
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public sealed class PdfPages : PdfDictionary, IEnumerable<PdfPage>
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{
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internal PdfPages(PdfDocument document)
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: base(document)
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{
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Elements.SetName(Keys.Type, "/Pages");
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Elements[Keys.Count] = new PdfInteger(0);
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}
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internal PdfPages(PdfDictionary dictionary)
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: base(dictionary)
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{ }
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/// <summary>
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/// Gets the number of pages.
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/// </summary>
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public int Count
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{
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get { return PagesArray.Elements.Count; }
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}
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/// <summary>
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/// Gets the page with the specified index.
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/// </summary>
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public PdfPage this[int index]
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{
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get
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{
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if (index < 0 || index >= Count)
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throw new ArgumentOutOfRangeException("index", index, PSSR.PageIndexOutOfRange);
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PdfDictionary dict = (PdfDictionary)((PdfReference)PagesArray.Elements[index]).Value;
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if (!(dict is PdfPage))
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dict = new PdfPage(dict);
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return (PdfPage)dict;
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}
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}
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/// <summary>
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/// Finds a page by its id. Transforms it to PdfPage if necessary.
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/// </summary>
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internal PdfPage FindPage(PdfObjectID id) // TODO: public?
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{
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PdfPage page = null;
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foreach (PdfItem item in PagesArray)
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{
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PdfReference reference = item as PdfReference;
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if (reference != null)
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{
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PdfDictionary dictionary = reference.Value as PdfDictionary;
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if (dictionary != null && dictionary.ObjectID == id)
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{
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page = dictionary as PdfPage ?? new PdfPage(dictionary);
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break;
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}
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}
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}
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return page;
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}
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/// <summary>
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/// Creates a new PdfPage, adds it to the end of this document, and returns it.
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/// </summary>
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public PdfPage Add()
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{
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PdfPage page = new PdfPage();
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Insert(Count, page);
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return page;
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}
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/// <summary>
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/// Adds the specified PdfPage to the end of this document and maybe returns a new PdfPage object.
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/// The value returned is a new object if the added page comes from a foreign document.
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/// </summary>
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public PdfPage Add(PdfPage page)
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{
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return Insert(Count, page);
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}
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/// <summary>
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/// Creates a new PdfPage, inserts it at the specified position into this document, and returns it.
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/// </summary>
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public PdfPage Insert(int index)
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{
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PdfPage page = new PdfPage();
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Insert(index, page);
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return page;
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}
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/// <summary>
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/// Inserts the specified PdfPage at the specified position to this document and maybe returns a new PdfPage object.
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/// The value returned is a new object if the inserted page comes from a foreign document.
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/// </summary>
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public PdfPage Insert(int index, PdfPage page)
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{
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if (page == null)
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throw new ArgumentNullException("page");
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// Is the page already owned by this document?
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if (page.Owner == Owner)
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{
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// Case: Page is first removed and than inserted again, maybe at another position.
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int count = Count;
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// Check if page is not already part of the document.
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for (int idx = 0; idx < count; idx++)
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{
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if (ReferenceEquals(this[idx], page))
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throw new InvalidOperationException(PSSR.MultiplePageInsert);
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}
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// TODO: check this case
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// Because the owner of the inserted page is this document we assume that the page was former part of it
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// and it is therefore well-defined.
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Owner._irefTable.Add(page);
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Debug.Assert(page.Owner == Owner);
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// Insert page in array.
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PagesArray.Elements.Insert(index, page.Reference);
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// Update page count.
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Elements.SetInteger(Keys.Count, PagesArray.Elements.Count);
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return page;
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}
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// All new page insertions come here.
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if (page.Owner == null)
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{
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// Case: New page was newly created and inserted now.
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page.Document = Owner;
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Owner._irefTable.Add(page);
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Debug.Assert(page.Owner == Owner);
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PagesArray.Elements.Insert(index, page.Reference);
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Elements.SetInteger(Keys.Count, PagesArray.Elements.Count);
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}
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else
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{
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// Case: Page is from an external document -> import it.
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PdfPage importPage = page;
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page = ImportExternalPage(importPage);
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Owner._irefTable.Add(page);
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// Add page substitute to importedObjectTable.
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PdfImportedObjectTable importedObjectTable = Owner.FormTable.GetImportedObjectTable(importPage);
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importedObjectTable.Add(importPage.ObjectID, page.Reference);
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PagesArray.Elements.Insert(index, page.Reference);
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Elements.SetInteger(Keys.Count, PagesArray.Elements.Count);
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PdfAnnotations.FixImportedAnnotation(page);
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}
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if (Owner.Settings.TrimMargins.AreSet)
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page.TrimMargins = Owner.Settings.TrimMargins;
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return page;
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}
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/// <summary>
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/// Inserts pages of the specified document into this document.
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/// </summary>
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/// <param name="index">The index in this document where to insert the page .</param>
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/// <param name="document">The document to be inserted.</param>
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/// <param name="startIndex">The index of the first page to be inserted.</param>
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/// <param name="pageCount">The number of pages to be inserted.</param>
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public void InsertRange(int index, PdfDocument document, int startIndex, int pageCount)
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{
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if (document == null)
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throw new ArgumentNullException("document");
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if (index < 0 || index > Count)
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throw new ArgumentOutOfRangeException("index", "Argument 'index' out of range.");
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int importDocumentPageCount = document.PageCount;
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if (startIndex < 0 || startIndex + pageCount > importDocumentPageCount)
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throw new ArgumentOutOfRangeException("startIndex", "Argument 'startIndex' out of range.");
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if (pageCount > importDocumentPageCount)
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throw new ArgumentOutOfRangeException("pageCount", "Argument 'pageCount' out of range.");
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PdfPage[] insertPages = new PdfPage[pageCount];
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PdfPage[] importPages = new PdfPage[pageCount];
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// 1st create all new pages.
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for (int idx = 0, insertIndex = index, importIndex = startIndex;
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importIndex < startIndex + pageCount;
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idx++, insertIndex++, importIndex++)
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{
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PdfPage importPage = document.Pages[importIndex];
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PdfPage page = ImportExternalPage(importPage);
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insertPages[idx] = page;
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importPages[idx] = importPage;
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Owner._irefTable.Add(page);
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// Add page substitute to importedObjectTable.
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PdfImportedObjectTable importedObjectTable = Owner.FormTable.GetImportedObjectTable(importPage);
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importedObjectTable.Add(importPage.ObjectID, page.Reference);
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PagesArray.Elements.Insert(insertIndex, page.Reference);
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if (Owner.Settings.TrimMargins.AreSet)
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page.TrimMargins = Owner.Settings.TrimMargins;
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}
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Elements.SetInteger(Keys.Count, PagesArray.Elements.Count);
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// 2nd copy link annotations that are in the range of the imported pages.
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for (int idx = 0, importIndex = startIndex;
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importIndex < startIndex + pageCount;
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idx++, importIndex++)
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{
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PdfPage importPage = document.Pages[importIndex];
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PdfPage page = insertPages[idx];
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// Get annotations.
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PdfArray annots = importPage.Elements.GetArray(PdfPage.Keys.Annots);
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if (annots != null)
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{
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PdfAnnotations annotations = new PdfAnnotations(Owner);
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// Loop through annotations.
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int count = annots.Elements.Count;
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for (int idxAnnotation = 0; idxAnnotation < count; idxAnnotation++)
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{
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PdfDictionary annot = annots.Elements.GetDictionary(idxAnnotation);
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if (annot != null)
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{
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string subtype = annot.Elements.GetString(PdfAnnotation.Keys.Subtype);
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if (subtype == "/Link")
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{
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bool addAnnotation = false;
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PdfLinkAnnotation newAnnotation = new PdfLinkAnnotation(Owner);
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PdfName[] importAnnotationKeyNames = annot.Elements.KeyNames;
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foreach (PdfName pdfItem in importAnnotationKeyNames)
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{
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PdfItem impItem;
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switch (pdfItem.Value)
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{
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case "/BS":
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newAnnotation.Elements.Add("/BS", new PdfLiteral("<</W 0>>"));
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break;
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case "/F": // /F 4
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impItem = annot.Elements.GetValue("/F");
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Debug.Assert(impItem is PdfInteger);
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newAnnotation.Elements.Add("/F", impItem.Clone());
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break;
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case "/Rect": // /Rect [68.6 681.08 145.71 702.53]
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impItem = annot.Elements.GetValue("/Rect");
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Debug.Assert(impItem is PdfArray);
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newAnnotation.Elements.Add("/Rect", impItem.Clone());
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break;
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case "/StructParent": // /StructParent 3
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impItem = annot.Elements.GetValue("/StructParent");
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Debug.Assert(impItem is PdfInteger);
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newAnnotation.Elements.Add("/StructParent", impItem.Clone());
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break;
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case "/Subtype": // Already set.
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break;
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case "/Dest": // /Dest [30 0 R /XYZ 68 771 0]
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impItem = annot.Elements.GetValue("/Dest");
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impItem = impItem.Clone();
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// Is value an array with 5 elements where the first one is an iref?
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PdfArray destArray = impItem as PdfArray;
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if (destArray != null && destArray.Elements.Count == 5)
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{
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PdfReference iref = destArray.Elements[0] as PdfReference;
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if (iref != null)
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{
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iref = RemapReference(insertPages, importPages, iref);
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if (iref != null)
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{
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destArray.Elements[0] = iref;
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newAnnotation.Elements.Add("/Dest", destArray);
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addAnnotation = true;
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}
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}
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}
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break;
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default:
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#if DEBUG_
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Debug-Break.Break(true);
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#endif
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break;
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}
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}
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// Add newAnnotations only it points to an imported page.
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if (addAnnotation)
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annotations.Add(newAnnotation);
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}
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}
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}
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// At least one link annotation found?
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if (annotations.Count > 0)
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{
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//Owner._irefTable.Add(annotations);
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page.Elements.Add(PdfPage.Keys.Annots, annotations);
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}
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}
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}
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}
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/// <summary>
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/// Inserts all pages of the specified document into this document.
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/// </summary>
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/// <param name="index">The index in this document where to insert the page .</param>
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/// <param name="document">The document to be inserted.</param>
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public void InsertRange(int index, PdfDocument document)
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{
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if (document == null)
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throw new ArgumentNullException("document");
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InsertRange(index, document, 0, document.PageCount);
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}
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/// <summary>
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/// Inserts all pages of the specified document into this document.
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/// </summary>
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/// <param name="index">The index in this document where to insert the page .</param>
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/// <param name="document">The document to be inserted.</param>
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/// <param name="startIndex">The index of the first page to be inserted.</param>
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public void InsertRange(int index, PdfDocument document, int startIndex)
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{
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if (document == null)
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throw new ArgumentNullException("document");
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InsertRange(index, document, startIndex, document.PageCount - startIndex);
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}
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/// <summary>
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/// Removes the specified page from the document.
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/// </summary>
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public void Remove(PdfPage page)
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{
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PagesArray.Elements.Remove(page.Reference);
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Elements.SetInteger(Keys.Count, PagesArray.Elements.Count);
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}
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/// <summary>
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/// Removes the specified page from the document.
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/// </summary>
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public void RemoveAt(int index)
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{
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PagesArray.Elements.RemoveAt(index);
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Elements.SetInteger(Keys.Count, PagesArray.Elements.Count);
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}
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/// <summary>
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/// Moves a page within the page sequence.
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/// </summary>
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/// <param name="oldIndex">The page index before this operation.</param>
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/// <param name="newIndex">The page index after this operation.</param>
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public void MovePage(int oldIndex, int newIndex)
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{
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if (oldIndex < 0 || oldIndex >= Count)
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throw new ArgumentOutOfRangeException("oldIndex");
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if (newIndex < 0 || newIndex >= Count)
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throw new ArgumentOutOfRangeException("newIndex");
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if (oldIndex == newIndex)
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return;
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//PdfPage page = (PdfPage)pagesArray.Elements[oldIndex];
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PdfReference page = (PdfReference)_pagesArray.Elements[oldIndex];
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_pagesArray.Elements.RemoveAt(oldIndex);
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_pagesArray.Elements.Insert(newIndex, page);
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}
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/// <summary>
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/// Imports an external page. The elements of the imported page are cloned and added to this document.
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/// Important: In contrast to PdfFormXObject adding an external page always make a deep copy
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/// of their transitive closure. Any reuse of already imported objects is not intended because
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/// any modification of an imported page must not change another page.
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/// </summary>
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PdfPage ImportExternalPage(PdfPage importPage)
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{
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if (importPage.Owner._openMode != PdfDocumentOpenMode.Import)
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throw new InvalidOperationException("A PDF document must be opened with PdfDocumentOpenMode.Import to import pages from it.");
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PdfPage page = new PdfPage(_document);
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// ReSharper disable AccessToStaticMemberViaDerivedType for a better code readability.
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CloneElement(page, importPage, PdfPage.Keys.Resources, false);
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CloneElement(page, importPage, PdfPage.Keys.Contents, false);
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CloneElement(page, importPage, PdfPage.Keys.MediaBox, true);
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CloneElement(page, importPage, PdfPage.Keys.CropBox, true);
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CloneElement(page, importPage, PdfPage.Keys.Rotate, true);
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CloneElement(page, importPage, PdfPage.Keys.BleedBox, true);
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CloneElement(page, importPage, PdfPage.Keys.TrimBox, true);
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CloneElement(page, importPage, PdfPage.Keys.ArtBox, true);
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#if true
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// Do not deep copy annotations.
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CloneElement(page, importPage, PdfPage.Keys.Annots, false);
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#else
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// Deep copy annotations.
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CloneElement(page, importPage, PdfPage.Keys.Annots, true);
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#endif
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// ReSharper restore AccessToStaticMemberViaDerivedType
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// TODO more elements?
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return page;
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}
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/// <summary>
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/// Helper function for ImportExternalPage.
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/// </summary>
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void CloneElement(PdfPage page, PdfPage importPage, string key, bool deepcopy)
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{
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Debug.Assert(page != null);
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Debug.Assert(page.Owner == _document);
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Debug.Assert(importPage.Owner != null);
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Debug.Assert(importPage.Owner != _document);
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PdfItem item = importPage.Elements[key];
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if (item != null)
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{
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PdfImportedObjectTable importedObjectTable = null;
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if (!deepcopy)
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importedObjectTable = Owner.FormTable.GetImportedObjectTable(importPage);
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// The item can be indirect. If so, replace it by its value.
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if (item is PdfReference)
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item = ((PdfReference)item).Value;
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if (item is PdfObject)
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{
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PdfObject root = (PdfObject)item;
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if (deepcopy)
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{
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Debug.Assert(root.Owner != null, "See 'else' case for details");
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root = DeepCopyClosure(_document, root);
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}
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else
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{
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// The owner can be null if the item is not a reference.
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if (root.Owner == null)
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root.Document = importPage.Owner;
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root = ImportClosure(importedObjectTable, page.Owner, root);
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}
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if (root.Reference == null)
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page.Elements[key] = root;
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else
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page.Elements[key] = root.Reference;
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}
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else
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{
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// Simple items are just cloned.
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page.Elements[key] = item.Clone();
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}
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}
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}
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static PdfReference RemapReference(PdfPage[] newPages, PdfPage[] impPages, PdfReference iref)
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{
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// Directs the iref to a one of the imported pages?
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for (int idx = 0; idx < newPages.Length; idx++)
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{
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if (impPages[idx].Reference == iref)
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return newPages[idx].Reference;
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}
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return null;
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}
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/// <summary>
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/// Gets a PdfArray containing all pages of this document. The array must not be modified.
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/// </summary>
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public PdfArray PagesArray
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{
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get
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{
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if (_pagesArray == null)
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_pagesArray = (PdfArray)Elements.GetValue(Keys.Kids, VCF.Create);
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return _pagesArray;
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}
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}
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PdfArray _pagesArray;
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/// <summary>
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/// Replaces the page tree by a flat array of indirect references to the pages objects.
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/// </summary>
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internal void FlattenPageTree()
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|
{
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// Acrobat creates a balanced tree if the number of pages is roughly more than ten. This is
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// not difficult but obviously also not necessary. I created a document with 50000 pages with
|
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// PDF4NET and Acrobat opened it in less than 2 seconds.
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//PdfReference xrefRoot = Document.Catalog.Elements[PdfCatalog.Keys.Pages] as PdfReference;
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//PdfDictionary[] pages = GetKids(xrefRoot, null);
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// Promote inheritable values down the page tree
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PdfPage.InheritedValues values = new PdfPage.InheritedValues();
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PdfPage.InheritValues(this, ref values);
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PdfDictionary[] pages = GetKids(Reference, values, null);
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// Replace /Pages in catalog by this object
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// xrefRoot.Value = this;
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|
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PdfArray array = new PdfArray(Owner);
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foreach (PdfDictionary page in pages)
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{
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// Fix the parent
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page.Elements[PdfPage.Keys.Parent] = Reference;
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array.Elements.Add(page.Reference);
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}
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Elements.SetName(Keys.Type, "/Pages");
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#if true
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// Direct array.
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Elements.SetValue(Keys.Kids, array);
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#else
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// Indirect array.
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Document.xrefTable.Add(array);
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Elements.SetValue(Keys.Kids, array.XRef);
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#endif
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Elements.SetInteger(Keys.Count, array.Elements.Count);
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}
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/// <summary>
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|
/// Recursively converts the page tree into a flat array.
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|
/// </summary>
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|
PdfDictionary[] GetKids(PdfReference iref, PdfPage.InheritedValues values, PdfDictionary parent)
|
|
{
|
|
// TODO: inherit inheritable keys...
|
|
PdfDictionary kid = (PdfDictionary)iref.Value;
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|
|
|
#if true
|
|
string type = kid.Elements.GetName(Keys.Type);
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|
if (type == "/Page")
|
|
{
|
|
PdfPage.InheritValues(kid, values);
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|
return new PdfDictionary[] { kid };
|
|
}
|
|
|
|
if (string.IsNullOrEmpty(type))
|
|
{
|
|
// Type is required. If type is missing, assume it is "/Page" and hope it will work.
|
|
// TODO Implement a "Strict" mode in PDFsharp and don't do this in "Strict" mode.
|
|
PdfPage.InheritValues(kid, values);
|
|
return new PdfDictionary[] { kid };
|
|
}
|
|
|
|
#else
|
|
if (kid.Elements.GetName(Keys.Type) == "/Page")
|
|
{
|
|
PdfPage.InheritValues(kid, values);
|
|
return new PdfDictionary[] { kid };
|
|
}
|
|
#endif
|
|
|
|
Debug.Assert(kid.Elements.GetName(Keys.Type) == "/Pages");
|
|
PdfPage.InheritValues(kid, ref values);
|
|
List<PdfDictionary> list = new List<PdfDictionary>();
|
|
PdfArray kids = kid.Elements["/Kids"] as PdfArray;
|
|
|
|
if (kids == null)
|
|
{
|
|
PdfReference xref3 = kid.Elements["/Kids"] as PdfReference;
|
|
if (xref3 != null)
|
|
kids = xref3.Value as PdfArray;
|
|
}
|
|
|
|
foreach (PdfReference xref2 in kids)
|
|
list.AddRange(GetKids(xref2, values, kid));
|
|
int count = list.Count;
|
|
Debug.Assert(count == kid.Elements.GetInteger("/Count"));
|
|
return list.ToArray();
|
|
}
|
|
|
|
/// <summary>
|
|
/// Prepares the document for saving.
|
|
/// </summary>
|
|
internal override void PrepareForSave()
|
|
{
|
|
// TODO: Close all open content streams
|
|
|
|
// TODO: Create the page tree.
|
|
// Arrays have a limit of 8192 entries, but I successfully tested documents
|
|
// with 50000 pages and no page tree.
|
|
// ==> wait for bug report.
|
|
int count = _pagesArray.Elements.Count;
|
|
for (int idx = 0; idx < count; idx++)
|
|
{
|
|
PdfPage page = this[idx];
|
|
page.PrepareForSave();
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the enumerator.
|
|
/// </summary>
|
|
public new IEnumerator<PdfPage> GetEnumerator()
|
|
{
|
|
return new PdfPagesEnumerator(this);
|
|
}
|
|
|
|
class PdfPagesEnumerator : IEnumerator<PdfPage>
|
|
{
|
|
internal PdfPagesEnumerator(PdfPages list)
|
|
{
|
|
_list = list;
|
|
_index = -1;
|
|
}
|
|
|
|
public bool MoveNext()
|
|
{
|
|
if (_index < _list.Count - 1)
|
|
{
|
|
_index++;
|
|
_currentElement = _list[_index];
|
|
return true;
|
|
}
|
|
_index = _list.Count;
|
|
return false;
|
|
}
|
|
|
|
public void Reset()
|
|
{
|
|
_currentElement = null;
|
|
_index = -1;
|
|
}
|
|
|
|
object IEnumerator.Current
|
|
{
|
|
get { return Current; }
|
|
}
|
|
|
|
public PdfPage Current
|
|
{
|
|
get
|
|
{
|
|
if (_index == -1 || _index >= _list.Count)
|
|
throw new InvalidOperationException(PSSR.ListEnumCurrentOutOfRange);
|
|
return _currentElement;
|
|
}
|
|
}
|
|
|
|
public void Dispose()
|
|
{
|
|
// Nothing to do.
|
|
}
|
|
|
|
PdfPage _currentElement;
|
|
int _index;
|
|
readonly PdfPages _list;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Predefined keys of this dictionary.
|
|
/// </summary>
|
|
internal sealed class Keys : PdfPage.InheritablePageKeys
|
|
{
|
|
/// <summary>
|
|
/// (Required) The type of PDF object that this dictionary describes;
|
|
/// must be Pages for a page tree node.
|
|
/// </summary>
|
|
[KeyInfo(KeyType.Name | KeyType.Required, FixedValue = "Pages")]
|
|
public const string Type = "/Type";
|
|
|
|
/// <summary>
|
|
/// (Required except in root node; must be an indirect reference)
|
|
/// The page tree node that is the immediate parent of this one.
|
|
/// </summary>
|
|
[KeyInfo(KeyType.Dictionary | KeyType.Required)]
|
|
public const string Parent = "/Parent";
|
|
|
|
/// <summary>
|
|
/// (Required) An array of indirect references to the immediate children of this node.
|
|
/// The children may be page objects or other page tree nodes.
|
|
/// </summary>
|
|
[KeyInfo(KeyType.Array | KeyType.Required)]
|
|
public const string Kids = "/Kids";
|
|
|
|
/// <summary>
|
|
/// (Required) The number of leaf nodes (page objects) that are descendants of this node
|
|
/// within the page tree.
|
|
/// </summary>
|
|
[KeyInfo(KeyType.Integer | KeyType.Required)]
|
|
public const string Count = "/Count";
|
|
|
|
/// <summary>
|
|
/// Gets the KeysMeta for these keys.
|
|
/// </summary>
|
|
public static DictionaryMeta Meta
|
|
{
|
|
get { return _meta ?? (_meta = CreateMeta(typeof(Keys))); }
|
|
}
|
|
static DictionaryMeta _meta;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the KeysMeta of this dictionary type.
|
|
/// </summary>
|
|
internal override DictionaryMeta Meta
|
|
{
|
|
get { return Keys.Meta; }
|
|
}
|
|
}
|
|
}
|