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.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.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using PdfSharpCore.Pdf.IO;
+using PdfSharpCore.Pdf.IO.enums;
+
+namespace PdfSharpCore.Pdf.Internal
+{
+    /// <summary>
+    /// Provides a thread-local cache for large objects.
+    /// </summary>
+    internal class ThreadLocalStorage // #???
+    {
+        public ThreadLocalStorage()
+        {
+            _importedDocuments = new Dictionary<string, PdfDocument.DocumentHandle>(StringComparer.OrdinalIgnoreCase);
+        }
+
+        public void AddDocument(string path, PdfDocument document)
+        {
+            _importedDocuments.Add(path, document.Handle);
+        }
+
+        public void RemoveDocument(string path)
+        {
+            _importedDocuments.Remove(path);
+        }
+
+        public PdfDocument GetDocument(string path, PdfReadAccuracy accuracy)
+        {
+            Debug.Assert(path.StartsWith("*") || Path.IsPathRooted(path), "Path must be full qualified.");
+
+            PdfDocument document = null;
+            PdfDocument.DocumentHandle handle;
+            if (_importedDocuments.TryGetValue(path, out handle))
+            {
+                document = handle.Target;
+                if (document == null)
+                    RemoveDocument(path);
+            }
+            if (document == null)
+            {
+                document = PdfReader.Open(path, PdfDocumentOpenMode.Import, accuracy);
+                _importedDocuments.Add(path, document.Handle);
+            }
+            return document;
+        }
+
+        public PdfDocument[] Documents
+        {
+            get
+            {
+                List<PdfDocument> list = new List<PdfDocument>();
+                foreach (PdfDocument.DocumentHandle handle in _importedDocuments.Values)
+                {
+                    if (handle.IsAlive)
+                        list.Add(handle.Target);
+                }
+                return list.ToArray();
+            }
+        }
+
+        public void DetachDocument(PdfDocument.DocumentHandle handle)
+        {
+            if (handle.IsAlive)
+            {
+                foreach (string path in _importedDocuments.Keys)
+                {
+                    if (_importedDocuments[path] == handle)
+                    {
+                        _importedDocuments.Remove(path);
+                        break;
+                    }
+                }
+            }
+
+            // Clean table
+            bool itemRemoved = true;
+            while (itemRemoved)
+            {
+                itemRemoved = false;
+                foreach (string path in _importedDocuments.Keys)
+                {
+                    if (!_importedDocuments[path].IsAlive)
+                    {
+                        _importedDocuments.Remove(path);
+                        itemRemoved = true;
+                        break;
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// Maps path to document handle.
+        /// </summary>
+        readonly Dictionary<string, PdfDocument.DocumentHandle> _importedDocuments;
+    }
+}