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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