260 lines
9.8 KiB
C#
260 lines
9.8 KiB
C#
#region PDFsharp - A .NET library for processing PDF
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//
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// Authors:
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// Stefan Lange
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//
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// Copyright (c) 2005-2016 empira Software GmbH, Cologne Area (Germany)
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//
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// http://www.PdfSharp.com
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// http://sourceforge.net/projects/pdfsharp
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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#endregion
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using System;
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using System.Diagnostics;
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using System.Collections.Generic;
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using System.Reflection;
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using System.Diagnostics.CodeAnalysis;
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namespace PdfSharpCore.Pdf
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{
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/// <summary>
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/// Holds information about the value of a key in a dictionary. This information is used to create
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/// and interpret this value.
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/// </summary>
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internal sealed class KeyDescriptor
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{
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/// <summary>
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/// Initializes a new instance of KeyDescriptor from the specified attribute during a KeysMeta
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/// initializes itself using reflection.
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/// </summary>
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public KeyDescriptor(KeyInfoAttribute attribute)
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{
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_version = attribute.Version;
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_keyType = attribute.KeyType;
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_fixedValue = attribute.FixedValue;
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_objectType = attribute.ObjectType;
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if (_version == "")
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_version = "1.0";
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}
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/// <summary>
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/// Gets or sets the PDF version starting with the availability of the described key.
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/// </summary>
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public string Version
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{
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get { return _version; }
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set { _version = value; }
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}
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string _version;
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public KeyType KeyType
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{
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get { return _keyType; }
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set { _keyType = value; }
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}
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KeyType _keyType;
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public string KeyValue
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{
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get { return _keyValue; }
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set { _keyValue = value; }
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}
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string _keyValue;
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public string FixedValue
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{
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get { return _fixedValue; }
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}
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readonly string _fixedValue;
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[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
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public Type ObjectType
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{
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get { return _objectType; }
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set { _objectType = value; }
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}
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[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
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Type _objectType;
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public bool CanBeIndirect
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{
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get { return (_keyType & KeyType.MustNotBeIndirect) == 0; }
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}
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/// <summary>
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/// Returns the type of the object to be created as value for the described key.
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/// </summary>
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[return: DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
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public Type GetValueType()
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{
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Type type = _objectType;
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if (type == null)
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{
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// If we have no ObjectType specified, use the KeyType enumeration.
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switch (_keyType & KeyType.TypeMask)
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{
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case KeyType.Name:
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type = typeof(PdfName);
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break;
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case KeyType.String:
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type = typeof(PdfString);
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break;
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case KeyType.Boolean:
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type = typeof(PdfBoolean);
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break;
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case KeyType.Integer:
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type = typeof(PdfInteger);
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break;
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case KeyType.Real:
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type = typeof(PdfReal);
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break;
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case KeyType.Date:
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type = typeof(PdfDate);
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break;
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case KeyType.Rectangle:
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type = typeof(PdfRectangle);
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break;
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case KeyType.Array:
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type = typeof(PdfArray);
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break;
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case KeyType.Dictionary:
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type = typeof(PdfDictionary);
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break;
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case KeyType.Stream:
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type = typeof(PdfDictionary);
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break;
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// The following types are not yet used
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case KeyType.NumberTree:
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throw new NotImplementedException("KeyType.NumberTree");
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case KeyType.NameOrArray:
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throw new NotImplementedException("KeyType.NameOrArray");
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case KeyType.ArrayOrDictionary:
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throw new NotImplementedException("KeyType.ArrayOrDictionary");
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case KeyType.StreamOrArray:
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throw new NotImplementedException("KeyType.StreamOrArray");
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case KeyType.ArrayOrNameOrString:
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return null; // HACK: Make PdfOutline work
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//throw new NotImplementedException("KeyType.ArrayOrNameOrString");
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default:
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Debug.Assert(false, "Invalid KeyType: " + _keyType);
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break;
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}
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}
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return type;
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}
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}
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/// <summary>
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/// Contains meta information about all keys of a PDF dictionary.
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/// </summary>
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internal class DictionaryMeta
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{
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public DictionaryMeta([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicFields)] Type type)
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{
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#if NET5_0_OR_GREATER
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FieldInfo[] fields = type.GetFields(BindingFlags.Public | BindingFlags.Static | BindingFlags.FlattenHierarchy);
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foreach (FieldInfo field in fields)
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{
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var attributes = field.GetCustomAttributes<KeyInfoAttribute>(false);
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foreach (var attribute in attributes)
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{
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KeyDescriptor descriptor = new KeyDescriptor(attribute);
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descriptor.KeyValue = (string)field.GetValue(null);
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_keyDescriptors[descriptor.KeyValue] = descriptor;
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}
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}
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#else
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// Rewritten for WinRT.
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CollectKeyDescriptors(type);
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//var fields = type.GetRuntimeFields(); // does not work
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//fields2.GetType();
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//foreach (FieldInfo field in fields)
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//{
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// var attributes = field.GetCustomAttributes(typeof(KeyInfoAttribute), false);
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// foreach (var attribute in attributes)
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// {
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// KeyDescriptor descriptor = new KeyDescriptor((KeyInfoAttribute)attribute);
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// descriptor.KeyValue = (string)field.GetValue(null);
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// _keyDescriptors[descriptor.KeyValue] = descriptor;
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// }
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//}
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#endif
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}
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#if !NET5_0_OR_GREATER
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// Background: The function GetRuntimeFields gets constant fields only for the specified type,
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// not for its base types. So we have to walk recursively through base classes.
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// The docmentation says full trust for the immediate caller is required for property BaseClass.
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// TODO: Rewrite this stuff for medium trust.
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void CollectKeyDescriptors(Type type)
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{
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// Get fields of the specified type only.
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var fields = type.GetTypeInfo().DeclaredFields;
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foreach (FieldInfo field in fields)
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{
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var attributes = field.GetCustomAttributes(typeof(KeyInfoAttribute), false);
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foreach (var attribute in attributes)
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{
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KeyDescriptor descriptor = new KeyDescriptor((KeyInfoAttribute)attribute);
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descriptor.KeyValue = (string)field.GetValue(null);
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_keyDescriptors[descriptor.KeyValue] = descriptor;
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}
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}
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type = type.GetTypeInfo().BaseType;
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if (type != typeof(object) && type != typeof(PdfObject))
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CollectKeyDescriptors(type);
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}
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#endif
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/// <summary>
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/// Gets the KeyDescriptor of the specified key, or null if no such descriptor exits.
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/// </summary>
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public KeyDescriptor this[string key]
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{
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get
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{
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KeyDescriptor keyDescriptor;
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_keyDescriptors.TryGetValue(key, out keyDescriptor);
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return keyDescriptor;
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}
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}
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readonly Dictionary<string, KeyDescriptor> _keyDescriptors = new Dictionary<string, KeyDescriptor>();
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}
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}
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