ExcCanonicalXml.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / ManagedLibraries / Security / System / Security / Cryptography / Xml / ExcCanonicalXml.cs / 1305376 / ExcCanonicalXml.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
// [....]
// 
 
//
// ExcCanonicalXml.cs 
//

namespace System.Security.Cryptography.Xml {
    using System.Xml; 
    using System.IO;
    using System.Text; 
    using System.Collections; 

    internal class ExcCanonicalXml { 
        private CanonicalXmlDocument m_c14nDoc;
        private ExcAncestralNamespaceContextManager m_ancMgr;

        internal ExcCanonicalXml(Stream inputStream, bool includeComments, string inclusiveNamespacesPrefixList, XmlResolver resolver, string strBaseUri) { 
            if (inputStream == null)
                throw new ArgumentNullException("inputStream"); 
 
            m_c14nDoc = new CanonicalXmlDocument(true, includeComments);
            m_c14nDoc.XmlResolver = resolver; 
            m_c14nDoc.Load(Utils.PreProcessStreamInput(inputStream, resolver, strBaseUri));
            m_ancMgr = new ExcAncestralNamespaceContextManager(inclusiveNamespacesPrefixList);
        }
 
        internal ExcCanonicalXml(XmlDocument document, bool includeComments, string inclusiveNamespacesPrefixList, XmlResolver resolver) {
            if (document == null) 
                throw new ArgumentNullException("document"); 

            m_c14nDoc = new CanonicalXmlDocument(true, includeComments); 
            m_c14nDoc.XmlResolver = resolver;
            m_c14nDoc.Load(new XmlNodeReader(document));
            m_ancMgr = new ExcAncestralNamespaceContextManager(inclusiveNamespacesPrefixList);
        } 

        internal ExcCanonicalXml(XmlNodeList nodeList, bool includeComments, string inclusiveNamespacesPrefixList, XmlResolver resolver) { 
            if (nodeList == null) 
                throw new ArgumentNullException("nodeList");
 
            XmlDocument doc = Utils.GetOwnerDocument(nodeList);
            if (doc == null)
                throw new ArgumentException("nodeList");
 
            m_c14nDoc = new CanonicalXmlDocument(false, includeComments);
            m_c14nDoc.XmlResolver = resolver; 
            m_c14nDoc.Load(new XmlNodeReader(doc)); 
            m_ancMgr = new ExcAncestralNamespaceContextManager(inclusiveNamespacesPrefixList);
 
            MarkInclusionStateForNodes(nodeList, doc, m_c14nDoc);
        }

        internal byte[] GetBytes() { 
            StringBuilder sb = new StringBuilder();
            m_c14nDoc.Write(sb, DocPosition.BeforeRootElement, m_ancMgr); 
            UTF8Encoding utf8 = new UTF8Encoding(false); 
            return utf8.GetBytes(sb.ToString());
        } 

        internal byte[] GetDigestedBytes(HashAlgorithm hash) {
            m_c14nDoc.WriteHash(hash, DocPosition.BeforeRootElement, m_ancMgr);
            hash.TransformFinalBlock(new byte[0], 0, 0); 
            byte[] res = (byte[]) hash.Hash.Clone();
            // reinitialize the hash so it is still usable after the call 
            hash.Initialize(); 
            return res;
        } 

        private static void MarkInclusionStateForNodes(XmlNodeList nodeList, XmlDocument inputRoot, XmlDocument root) {
            CanonicalXmlNodeList elementList = new CanonicalXmlNodeList();
            CanonicalXmlNodeList elementListCanonical = new CanonicalXmlNodeList(); 
            elementList.Add(inputRoot);
            elementListCanonical.Add(root); 
            int index = 0; 

            do { 
                XmlNode currentNode = (XmlNode) elementList[index];
                XmlNode currentNodeCanonical = (XmlNode) elementListCanonical[index];
                XmlNodeList childNodes = currentNode.ChildNodes;
                XmlNodeList childNodesCanonical = currentNodeCanonical.ChildNodes; 
                for (int i = 0; i < childNodes.Count; i++) {
                    elementList.Add(childNodes[i]); 
                    elementListCanonical.Add(childNodesCanonical[i]); 

                    if (Utils.NodeInList(childNodes[i], nodeList)) { 
                        MarkNodeAsIncluded(childNodesCanonical[i]);
                    }

                    XmlAttributeCollection attribNodes = childNodes[i].Attributes; 
                    if (attribNodes != null) {
                        for (int j = 0; j < attribNodes.Count; j++) { 
                            if (Utils.NodeInList(attribNodes[j], nodeList)) { 
                                MarkNodeAsIncluded(childNodesCanonical[i].Attributes.Item(j));
                            } 
                        }
                    }
                }
                index++; 
            } while (index < elementList.Count);
        } 
 
        static void MarkNodeAsIncluded(XmlNode node) {
            if (node is ICanonicalizableNode) 
               ((ICanonicalizableNode) node).IsInNodeSet = true;
        }
    }
 
    // the stack of currently active NamespaceFrame contexts. this
    // object also maintains the inclusive prefix list in a tokenized form. 
    internal class ExcAncestralNamespaceContextManager : AncestralNamespaceContextManager { 
        private Hashtable m_inclusivePrefixSet = null;
 
        internal ExcAncestralNamespaceContextManager(string inclusiveNamespacesPrefixList) {
            m_inclusivePrefixSet = Utils.TokenizePrefixListString(inclusiveNamespacesPrefixList);
        }
 
        private bool HasNonRedundantInclusivePrefix(XmlAttribute attr) {
            int tmp; 
            string nsPrefix = Utils.GetNamespacePrefix(attr); 
            return m_inclusivePrefixSet.ContainsKey(nsPrefix) &&
                Utils.IsNonRedundantNamespaceDecl(attr, GetNearestRenderedNamespaceWithMatchingPrefix(nsPrefix, out tmp)); 
        }

        private void GatherNamespaceToRender(string nsPrefix, SortedList nsListToRender, Hashtable nsLocallyDeclared) {
            foreach (object a in nsListToRender.GetKeyList()) { 
                if (Utils.HasNamespacePrefix((XmlAttribute) a, nsPrefix))
                    return; 
            } 

            int rDepth; 
            XmlAttribute local = (XmlAttribute) nsLocallyDeclared[nsPrefix];
            XmlAttribute rAncestral = GetNearestRenderedNamespaceWithMatchingPrefix(nsPrefix, out rDepth);

            if (local != null) { 
                if (Utils.IsNonRedundantNamespaceDecl(local, rAncestral)) {
                    nsLocallyDeclared.Remove(nsPrefix); 
                    nsListToRender.Add(local, null); 
                }
            } else { 
                int uDepth;
                XmlAttribute uAncestral = GetNearestUnrenderedNamespaceWithMatchingPrefix(nsPrefix, out uDepth);
                if (uAncestral != null && uDepth > rDepth && Utils.IsNonRedundantNamespaceDecl(uAncestral, rAncestral)) {
                    nsListToRender.Add(uAncestral, null); 
                }
            } 
        } 

        internal override void GetNamespacesToRender (XmlElement element, SortedList attrListToRender, SortedList nsListToRender, Hashtable nsLocallyDeclared) { 
            GatherNamespaceToRender(element.Prefix, nsListToRender, nsLocallyDeclared);
            foreach (object attr in attrListToRender.GetKeyList()) {
                string prefix = ((XmlAttribute) attr).Prefix;
                if (prefix.Length > 0) 
                    GatherNamespaceToRender(prefix, nsListToRender, nsLocallyDeclared);
            } 
        } 

        internal override void TrackNamespaceNode(XmlAttribute attr, SortedList nsListToRender, Hashtable nsLocallyDeclared) { 
            if(!Utils.IsXmlPrefixDefinitionNode(attr)) {
                if(HasNonRedundantInclusivePrefix(attr))
                    nsListToRender.Add(attr, null);
                else 
                    nsLocallyDeclared.Add(Utils.GetNamespacePrefix(attr), attr);
            } 
        } 

        internal override void TrackXmlNamespaceNode(XmlAttribute attr, SortedList nsListToRender, SortedList attrListToRender, Hashtable nsLocallyDeclared) { 
            // exclusive canonicalization treats Xml namespaces as simple attributes. They are not propagated.
            attrListToRender.Add(attr, null);
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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ExcCanonicalXml.cs source code in C# .NET

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