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) 2005-20165 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.Collections.Generic;
+using System.Diagnostics;
+using PdfSharpCore.Pdf.IO;
+
+namespace PdfSharpCore.Pdf
+{
+    /// <summary>
+    /// Represents a PDF name value.
+    /// </summary>
+    [DebuggerDisplay("({Value})")]
+    public sealed class PdfName : PdfItem
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PdfName"/> class.
+        /// </summary>
+        public PdfName()
+        {
+            _value = "/";  // Empty name.
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PdfName"/> class.
+        /// Parameter value always must start with a '/'.
+        /// </summary>
+        public PdfName(string value)
+        {
+            if (value == null)
+                throw new ArgumentNullException("value");
+            if (value.Length == 0 || value[0] != '/')
+                throw new ArgumentException(PSSR.NameMustStartWithSlash);
+
+            _value = value;
+        }
+
+        /// <summary>
+        /// Determines whether the specified object is equal to this name.
+        /// </summary>
+        public override bool Equals(object obj)
+        {
+            return _value.Equals(obj);
+        }
+
+        /// <summary>
+        /// Returns the hash code for this instance.
+        /// </summary>
+        public override int GetHashCode()
+        {
+            return _value.GetHashCode();
+        }
+
+        /// <summary>
+        /// Gets the name as a string.
+        /// </summary>
+        public string Value
+        {
+            // This class must behave like a value type. Therefore it cannot be changed (like System.String).
+            get { return _value; }
+        }
+        readonly string _value;
+
+        /// <summary>
+        /// Returns the name. The string always begins with a slash.
+        /// </summary>
+        public override string ToString()
+        {
+            return _value;
+        }
+
+        /// <summary>
+        /// Determines whether the specified name and string are equal.
+        /// </summary>
+        public static bool operator ==(PdfName name, string str)
+        {
+            if (ReferenceEquals(name, null))
+                return str == null;
+
+            return name._value == str;
+        }
+
+        /// <summary>
+        /// Determines whether the specified name and string are not equal.
+        /// </summary>
+        public static bool operator !=(PdfName name, string str)
+        {
+            if (ReferenceEquals(name, null))
+                return str != null;
+
+            return name._value != str;
+        }
+
+        /// <summary>
+        /// Represents the empty name.
+        /// </summary>
+        public static readonly PdfName Empty = new PdfName("/");
+
+        /// <summary>
+        /// Writes the name including the leading slash.
+        /// </summary>
+        internal override void WriteObject(PdfWriter writer)
+        {
+            // TODO: what if unicode character are part of the name? 
+            writer.Write(this);
+        }
+
+        /// <summary>
+        /// Gets the comparer for this type.
+        /// </summary>
+        public static PdfXNameComparer Comparer
+        {
+            get { return new PdfXNameComparer(); }
+        }
+
+        /// <summary>
+        /// Implements a comparer that compares PdfName objects.
+        /// </summary>
+        public class PdfXNameComparer : IComparer<PdfName>
+        {
+            /// <summary>
+            /// Compares two objects and returns a value indicating whether one is less than, equal to, or greater than the other.
+            /// </summary>
+            /// <param name="l">The first object to compare.</param>
+            /// <param name="r">The second object to compare.</param>
+            public int Compare(PdfName l, PdfName r)
+            {
+
+                if (l != null)
+                {
+                    if (r != null)
+                        return String.Compare(l._value, r._value, StringComparison.Ordinal);
+                    return -1;
+                }
+                if (r != null)
+                    return 1;
+                return 0;
+            }
+        }
+    }
+}