vendor: import KillerPDF 1.7.5 source (GPL-3.0) as the base for MMD PDF

2026-08-27 06:58:22 +02:00
commit 532485a830
577 changed files with 149058 additions and 0 deletions
@@ -0,0 +1,158 @@
+#region PDFsharp - A .NET library for processing PDF
+//
+// Authors:
+//   Stefan Lange
+//
+// Copyright (c) 2005-2016 empira Software GmbH, Cologne Area (Germany)
+//
+// http://www.PdfSharpCore.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.IO;
+using PdfSharpCore.Pdf.IO;
+
+namespace PdfSharpCore.Pdf.Advanced
+{
+    /// <summary>
+    /// Represents an object stream that contains compressed objects.
+    /// PDF 1.5.
+    /// </summary>
+    public class PdfObjectStream : PdfDictionary
+    {
+        // Reference: 3.4.6  Object Streams / Page 100
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PdfObjectStream"/> class.
+        /// </summary>
+        public PdfObjectStream(PdfDocument document)
+            : base(document)
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance from an existing dictionary. Used for object type transformation.
+        /// </summary>
+        internal PdfObjectStream(PdfDictionary dict)
+            : base(dict)
+        {
+            // while objects inside an object-stream are not encrypted, the object-streams themself ARE !
+            // 7.5.7, Page 47: In an encrypted file (i.e., entire object stream is encrypted),
+            // strings occurring anywhere in an object stream shall not be separately encrypted.
+            if (_document._trailer.Elements[PdfTrailer.Keys.Encrypt] is PdfReference)
+                _document.SecurityHandler.EncryptObject(dict);
+
+            int n = Elements.GetInteger(Keys.N);
+            int first = Elements.GetInteger(Keys.First);
+            Stream.TryUnfilter();
+
+            Parser parser = new Parser(null, new MemoryStream(Stream.Value));
+            _header = parser.ReadObjectStreamHeader(n, first);
+        }
+
+        /// <summary>
+        /// Reads the compressed object with the specified index.
+        /// </summary>
+        internal void ReadReferences(PdfCrossReferenceTable xrefTable)
+        {
+            ////// Create parser for stream.
+            ////Parser parser = new Parser(_document, new MemoryStream(Stream.Value));
+            for (int idx = 0; idx < _header.Length; idx++)
+            {
+                int objectNumber = _header[idx][0];
+                int offset = _header[idx][1];
+
+                PdfObjectID objectID = new PdfObjectID(objectNumber);
+
+                // HACK: -1 indicates compressed object.
+                PdfReference iref = new PdfReference(objectID, -1);
+                ////iref.ObjectID = objectID;
+                ////iref.Value = xrefStream;
+                if (!xrefTable.Contains(iref.ObjectID))
+                {
+                    xrefTable.Add(iref);
+                }
+                else
+                {
+                    GetType();
+                }
+            }
+        }
+
+        /// <summary>
+        /// Reads the compressed object with the specified index.
+        /// </summary>
+        internal PdfReference ReadCompressedObject(int index)
+        {
+            Parser parser = new Parser(_document, new MemoryStream(Stream.Value));
+            int objectNumber = _header[index][0];
+            int offset = _header[index][1];
+            return parser.ReadCompressedObject(objectNumber, offset);
+        }
+
+        /// <summary>
+        /// N pairs of integers.
+        /// The first integer represents the object number of the compressed object.
+        /// The second integer represents the absolute offset of that object in the decoded stream,
+        /// i.e. the byte offset plus First entry.
+        /// </summary>
+        private readonly int[][] _header;  // Reference: Page 102
+
+        /// <summary>
+        /// Predefined keys common to all font dictionaries.
+        /// </summary>
+        public class Keys : PdfStream.Keys
+        {
+            // Reference: TABLE 3.14  Additional entries specific to an object stream dictionary / Page 101
+
+            /// <summary>
+            /// (Required) The type of PDF object that this dictionary describes;
+            /// must be ObjStmfor an object stream.
+            /// </summary>
+            [KeyInfo(KeyType.Name | KeyType.Required, FixedValue = "ObjStm")]
+            public const string Type = "/Type";
+
+            /// <summary>
+            /// (Required) The number of compressed objects in the stream.
+            /// </summary>
+            [KeyInfo(KeyType.Integer | KeyType.Required)]
+            public const string N = "/N";
+
+            /// <summary>
+            /// (Required) The byte offset (in the decoded stream) of the first
+            /// compressed object.
+            /// </summary>
+            [KeyInfo(KeyType.Integer | KeyType.Required)]
+            public const string First = "/First";
+
+            /// <summary>
+            /// (Optional) A reference to an object stream, of which the current object
+            /// stream is considered an extension. Both streams are considered part of
+            /// a collection of object streams (see below). A given collection consists
+            /// of a set of streams whose Extendslinks form a directed acyclic graph.
+            /// </summary>
+            [KeyInfo(KeyType.Stream | KeyType.Optional)]
+            public const string Extends = "/Extends";
+        }
+    }
+}