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#region PDFsharp - A .NET library for processing PDF
//
// Authors:
// Stefan Lange (mailto:Stefan.Lange@pdfsharp.com)
//
// Copyright (c) 2005-2008 empira Software GmbH, Cologne (Germany)
//
// http://www.pdfsharp.com
// http://sourceforge.net/projects/pdfsharp
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
#endregion
using System;
using System.Diagnostics;
using System.Collections;
using System.Text;
using System.IO;
using PdfSharp.Drawing;
using PdfSharp.Drawing.Pdf;
using PdfSharp.Pdf;
using PdfSharp.Pdf.Internal;
using PdfSharp.Pdf.Filters;
using PdfSharp.Pdf.IO;
namespace PdfSharp.Pdf.Advanced
{
/// <summary>
/// Represents an array of PDF content streams of a page.
/// </summary>
public sealed class PdfContents : PdfArray
{
/// <summary>
/// Initializes a new instance of the <see cref="PdfContents"/> class.
/// </summary>
/// <param name="document">The document.</param>
public PdfContents(PdfDocument document)
: base(document)
{
}
internal PdfContents(PdfArray array)
: base(array)
{
int count = Elements.Count;
for (int idx = 0; idx < count; idx++)
{
// Convert the references from PdfDictionary to PdfContent
PdfItem item = Elements[idx];
PdfReference iref = item as PdfReference;
if (iref != null && iref.Value is PdfDictionary)
{
// The following line is correct!
new PdfContent((PdfDictionary)iref.Value);
}
else
throw new InvalidOperationException("Unexpected item in a content stream array.");
}
}
/// <summary>
/// Appends a new content stream and returns it.
/// </summary>
public PdfContent AppendContent()
{
Debug.Assert(this.Owner != null);
SetModified();
PdfContent content = new PdfContent(this.Owner);
Owner.irefTable.Add(content);
Debug.Assert(content.Reference != null);
Elements.Add(content.Reference);
return content;
}
/// <summary>
/// Prepends a new content stream and returns it.
/// </summary>
public PdfContent PrependContent()
{
Debug.Assert(this.Owner != null);
SetModified();
PdfContent content = new PdfContent(this.Owner);
Owner.irefTable.Add(content);
Debug.Assert(content.Reference != null);
Elements.Insert(0, content.Reference);
return content;
}
/// <summary>
/// Creates a single content stream with the bytes from the array of the content streams.
/// This operation does not modify any of the content streams in this array.
/// </summary>
public PdfContent CreateSingleContent()
{
byte[] bytes = new byte[0];
byte[] bytes1;
byte[] bytes2;
foreach (PdfItem iref in Elements)
{
PdfDictionary cont = (PdfDictionary)((PdfReference)iref).Value;
bytes1 = bytes;
bytes2 = cont.Stream.UnfilteredValue;
bytes = new byte[bytes1.Length + bytes2.Length + 1];
bytes1.CopyTo(bytes, 0);
bytes[bytes1.Length] = (byte)'\n';
bytes2.CopyTo(bytes, bytes1.Length + 1);
}
PdfContent content = new PdfContent(this.Owner);
content.Stream = new PdfDictionary.PdfStream(bytes, content);
return content;
}
void SetModified()
{
if (!this.modified)
{
this.modified = true;
int count = Elements.Count;
if (count == 1)
{
PdfContent content = (PdfContent)((PdfReference)Elements[0]).Value;
content.PreserveGraphicsState();
}
else if (count > 1)
{
// Surround content streams with q/Q operations
byte[] value;
int length;
PdfContent content = (PdfContent)((PdfReference)Elements[0]).Value;
if (content != null && content.Stream != null)
{
length = content.Stream.Length;
value = new byte[length + 2];
value[0] = (byte)'q';
value[1] = (byte)'\n';
Array.Copy(content.Stream.Value, 0, value, 2, length);
content.Stream.Value = value;
content.Elements.SetInteger("/Length", length + 2);
}
content = (PdfContent)((PdfReference)Elements[count - 1]).Value;
if (content != null && content.Stream != null)
{
length = content.Stream.Length;
value = new byte[length + 3];
Array.Copy(content.Stream.Value, 0, value, 0, length);
value[length] = (byte)' ';
value[length + 1] = (byte)'Q';
value[length + 2] = (byte)'\n';
content.Stream.Value = value;
content.Elements.SetInteger("/Length", length + 3);
}
}
}
}
bool modified;
internal override void WriteObject(PdfWriter writer)
{
// Save two bytes in PDF stream...
if (Elements.Count == 1)
Elements[0].WriteObject(writer);
else
base.WriteObject(writer);
}
}
}
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