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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.Collections.Generic;
using System.Text;
using System.IO;
using PdfSharp.Drawing;
using PdfSharp.Internal;
using PdfSharp.Fonts;
using PdfSharp.Fonts.TrueType;
using PdfSharp.Pdf.Advanced;
using PdfSharp.Pdf.Filters;
namespace PdfSharp.Pdf.Advanced
{
/// <summary>
/// Represents a ToUnicode map for composite font.
/// </summary>
internal sealed class PdfToUnicodeMap : PdfDictionary
{
public PdfToUnicodeMap(PdfDocument document)
: base(document)
{
}
public PdfToUnicodeMap(PdfDocument document, CMapInfo cmapInfo)
: base(document)
{
this.cmapInfo = cmapInfo;
}
/// <summary>
/// Gets or sets the CMap info.
/// </summary>
public CMapInfo CMapInfo
{
get { return this.cmapInfo; }
set { this.cmapInfo = value; }
}
CMapInfo cmapInfo;
/// <summary>
/// Creates the ToUnicode map from the CMapInfo.
/// </summary>
internal override void PrepareForSave()
{
base.PrepareForSave();
// This code comes literaly from PDF Reference
string prefix =
"/CIDInit /ProcSet findresource begin\n" +
"12 dict begin\n" +
"begincmap\n" +
"/CIDSystemInfo << /Registry (Adobe)/Ordering (UCS)/Supplement 0>> def\n" +
"/CMapName /Adobe-Identity-UCS def /CMapType 2 def\n";
string suffix = "endcmap CMapName currentdict /CMap defineresource pop end end";
Hashtable glyphIndexToCharacter = new Hashtable();
int lowIndex = 65536, hiIndex = -1;
foreach (KeyValuePair<char, int> entry in this.cmapInfo.CharacterToGlyphIndex)
{
int index = (int)entry.Value;
lowIndex = Math.Min(lowIndex, index);
hiIndex = Math.Max(hiIndex, index);
//glyphIndexToCharacter.Add(index, entry.Key);
glyphIndexToCharacter[index] = entry.Key;
}
MemoryStream ms = new MemoryStream();
StreamWriter wrt = new StreamWriter(ms, Encoding.ASCII);
wrt.Write(prefix);
wrt.WriteLine("1 begincodespacerange");
wrt.WriteLine(String.Format("<{0:X4}><{1:X4}>", lowIndex, hiIndex));
wrt.WriteLine("endcodespacerange");
// Sorting seems not necessary. The limit is 100 entries, we will see.
wrt.WriteLine(String.Format("{0} beginbfrange", glyphIndexToCharacter.Count));
foreach (DictionaryEntry entry in glyphIndexToCharacter)
wrt.WriteLine(String.Format("<{0:X4}><{0:X4}><{1:X4}>", (int)entry.Key, (int)(char)entry.Value));
wrt.WriteLine("endbfrange");
wrt.Write(suffix);
wrt.Close();
// Compress like content streams
byte[] bytes = ms.ToArray();
ms.Close();
if (Owner.Options.CompressContentStreams)
{
Elements.SetName("/Filter", "/FlateDecode");
bytes = Filtering.FlateDecode.Encode(bytes);
}
PdfStream stream = CreateStream(bytes);
}
public sealed class Keys : PdfDictionary.PdfStream.Keys
{
}
}
}
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