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
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+#region PDFsharp - A .NET library for processing PDF
+//
+// Authors:
+//   Stefan Lange
+//
+// Copyright (c) 2005-2016 empira Software GmbH, Cologne Area (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.Globalization;
+
+namespace PdfSharpCore.Pdf
+{
+    /// <summary>
+    /// Represents a PDF object identifier, a pair of object and generation number.
+    /// </summary>
+    [DebuggerDisplay("{DebuggerDisplay}")]
+    public struct PdfObjectID : IComparable
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PdfObjectID"/> class.
+        /// </summary>
+        /// <param name="objectNumber">The object number.</param>
+        public PdfObjectID(int objectNumber)
+        {
+            Debug.Assert(objectNumber >= 1, "Object number out of range.");
+            _objectNumber = objectNumber;
+            _generationNumber = 0;
+#if DEBUG_
+            // Just a place for a breakpoint during debugging.
+            if (objectNumber == 5894)
+                GetType();
+#endif
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PdfObjectID"/> class.
+        /// </summary>
+        /// <param name="objectNumber">The object number.</param>
+        /// <param name="generationNumber">The generation number.</param>
+        public PdfObjectID(int objectNumber, int generationNumber)
+        {
+            Debug.Assert(objectNumber >= 1, "Object number out of range.");
+            //Debug.Assert(generationNumber >= 0 && generationNumber <= 65535, "Generation number out of range.");
+#if DEBUG_
+            // iText creates generation numbers with a value of 65536... 
+            if (generationNumber > 65535)
+                Debug.WriteLine(String.Format("Generation number: {0}", generationNumber));
+#endif
+            _objectNumber = objectNumber;
+            _generationNumber = (ushort)generationNumber;
+        }
+
+        /// <summary>
+        /// Gets or sets the object number.
+        /// </summary>
+        public int ObjectNumber
+        {
+            get { return _objectNumber; }
+        }
+        readonly int _objectNumber;
+
+        /// <summary>
+        /// Gets or sets the generation number.
+        /// </summary>
+        public int GenerationNumber
+        {
+            get { return _generationNumber; }
+        }
+        readonly ushort _generationNumber;
+
+        /// <summary>
+        /// Indicates whether this object is an empty object identifier.
+        /// </summary>
+        public bool IsEmpty
+        {
+            get { return _objectNumber == 0; }
+        }
+
+        /// <summary>
+        /// Indicates whether this instance and a specified object are equal.
+        /// </summary>
+        public override bool Equals(object obj)
+        {
+            if (obj is PdfObjectID)
+            {
+                PdfObjectID id = (PdfObjectID)obj;
+                if (_objectNumber == id._objectNumber)
+                    return _generationNumber == id._generationNumber;
+            }
+            return false;
+        }
+
+        /// <summary>
+        /// Returns the hash code for this instance.
+        /// </summary>
+        public override int GetHashCode()
+        {
+            return _objectNumber ^ _generationNumber;
+        }
+
+        /// <summary>
+        /// Determines whether the two objects are equal.
+        /// </summary>
+        public static bool operator ==(PdfObjectID left, PdfObjectID right)
+        {
+            return left.Equals(right);
+        }
+
+        /// <summary>
+        /// Determines whether the tow objects not are equal.
+        /// </summary>
+        public static bool operator !=(PdfObjectID left, PdfObjectID right)
+        {
+            return !left.Equals(right);
+        }
+
+        /// <summary>
+        /// Returns the object and generation numbers as a string.
+        /// </summary>
+        public override string ToString()
+        {
+            return _objectNumber.ToString(CultureInfo.InvariantCulture) + " " + _generationNumber.ToString(CultureInfo.InvariantCulture);
+        }
+
+        /// <summary>
+        /// Creates an empty object identifier.
+        /// </summary>
+        public static PdfObjectID Empty
+        {
+            get { return new PdfObjectID(); }
+        }
+
+        /// <summary>
+        /// Compares the current object id with another object.
+        /// </summary>
+        public int CompareTo(object obj)
+        {
+            if (obj is PdfObjectID)
+            {
+                PdfObjectID id = (PdfObjectID)obj;
+                if (_objectNumber == id._objectNumber)
+                    return _generationNumber - id._generationNumber;
+                return _objectNumber - id._objectNumber;
+            }
+            return 1;
+        }
+
+        /// <summary>
+        /// Gets the DebuggerDisplayAttribute text.
+        /// </summary>
+        internal string DebuggerDisplay
+        {
+            get { return String.Format("id=({0})", ToString()); }
+        }
+    }
+}