Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / SecurityDocument.cs / 1 / SecurityDocument.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== //---------------------------------------------------------------------------- // // CLASS: SecurityDocument.cs // // PURPOSE: Represent an XML document // // //--------------------------------------------------------------------------- namespace System.Security { using System; using System.Collections; using System.Security.Util; using System.Text; using System.Globalization; using System.IO; using StringMaker = System.Security.Util.Tokenizer.StringMaker; [Serializable] sealed internal class SecurityDocumentElement : ISecurityElementFactory { private int m_position; private SecurityDocument m_document; internal SecurityDocumentElement( SecurityDocument document, int position ) { m_document = document; m_position = position; } SecurityElement ISecurityElementFactory.CreateSecurityElement() { return m_document.GetElement( m_position, true ); } Object ISecurityElementFactory.Copy() { return new SecurityDocumentElement( m_document, m_position ); } String ISecurityElementFactory.GetTag() { return m_document.GetTagForElement( m_position ); } String ISecurityElementFactory.Attribute( String attributeName ) { return m_document.GetAttributeForElement( m_position, attributeName ); } } [Serializable] sealed internal class SecurityDocument { internal byte[] m_data; internal const byte c_element = 1; internal const byte c_attribute = 2; internal const byte c_text = 3; internal const byte c_children = 4; internal const int c_growthSize = 32; public SecurityDocument( int numData ) { m_data = new byte[numData]; } public SecurityDocument( byte[] data ) { this.m_data = data; } public SecurityDocument( SecurityElement elRoot ) { m_data = new byte[c_growthSize]; int position = 0; ConvertElement( elRoot, ref position ); } public void GuaranteeSize( int size ) { if (m_data.Length < size) { byte[] m_newData = new byte[((size / c_growthSize) + 1) * c_growthSize]; Array.Copy( m_data, 0, m_newData, 0, m_data.Length ); m_data = m_newData; } } public void AddString( String str, ref int position ) { // @ GuaranteeSize( position + str.Length * 2 + 2 ); for (int i = 0; i < str.Length; ++i) { m_data[position+(2*i)] = (byte)(str[i] >> 8); m_data[position+(2*i)+1] = (byte)(str[i] & 0x00FF); } m_data[position + str.Length * 2] = 0; m_data[position + str.Length * 2 + 1] = 0; position += str.Length * 2 + 2; } public void AppendString( String str, ref int position ) { if (position <= 1 || m_data[position - 1] != 0 || m_data[position - 2] != 0 ) throw new XmlSyntaxException(); position -= 2; AddString( str, ref position ); } public static int EncodedStringSize( String str ) { return str.Length * 2 + 2; } public String GetString( ref int position ) { return GetString( ref position, true ); } public String GetString( ref int position, bool bCreate ) { int stringEnd; bool bFoundEnd = false; for (stringEnd = position; stringEnd < m_data.Length-1; stringEnd += 2) { if (m_data[stringEnd] == 0 && m_data[stringEnd + 1] == 0) { bFoundEnd = true; break; } } BCLDebug.Assert(bFoundEnd, "Malformed string in parse data"); StringMaker m = System.SharedStatics.GetSharedStringMaker(); try { if (bCreate) { m._outStringBuilder = null; m._outIndex = 0; for (int i = position; i < stringEnd; i += 2) { char c = (char)(m_data[i] << 8 | m_data[i+1]); // add character to the string if (m._outIndex < StringMaker.outMaxSize) { // easy case m._outChars[m._outIndex++] = c; } else { if (m._outStringBuilder == null) { // OK, first check if we have to init the StringBuilder m._outStringBuilder = new StringBuilder(); } // OK, copy from _outChars to _outStringBuilder m._outStringBuilder.Append(m._outChars, 0, StringMaker.outMaxSize); // reset _outChars pointer m._outChars[0] = c; m._outIndex = 1; } } } position = stringEnd + 2; if (bCreate) return m.MakeString(); else return null; } finally { System.SharedStatics.ReleaseSharedStringMaker(ref m); } } public void AddToken( byte b, ref int position ) { GuaranteeSize( position + 1 ); m_data[position++] = b; } public void ConvertElement( SecurityElement elCurrent, ref int position ) { AddToken( c_element, ref position ); AddString( elCurrent.m_strTag, ref position ); if (elCurrent.m_lAttributes != null) { for (int i = 0; i < elCurrent.m_lAttributes.Count; i+=2) { AddToken( c_attribute, ref position ); AddString( (String)elCurrent.m_lAttributes[i], ref position ); AddString( (String)elCurrent.m_lAttributes[i+1], ref position ); } } if (elCurrent.m_strText != null) { AddToken( c_text, ref position ); AddString( elCurrent.m_strText, ref position ); } if (elCurrent.InternalChildren != null) { for (int i = 0; i < elCurrent.InternalChildren.Count; ++i) { ConvertElement( (SecurityElement)elCurrent.Children[i], ref position ); } } AddToken( c_children, ref position ); } public SecurityElement GetRootElement() { return GetElement( 0, true ); } public SecurityElement GetElement( int position, bool bCreate ) { SecurityElement elRoot = InternalGetElement( ref position, bCreate ); return elRoot; } internal SecurityElement InternalGetElement( ref int position, bool bCreate ) { if (m_data.Length <= position) throw new XmlSyntaxException(); if (m_data[position++] != c_element) throw new XmlSyntaxException(); SecurityElement elCurrent = null; String strTag = GetString( ref position, bCreate ); if (bCreate) elCurrent = new SecurityElement( strTag ); while (m_data[position] == c_attribute) { position++; String strName = GetString( ref position, bCreate ); String strValue = GetString( ref position, bCreate ); if (bCreate) elCurrent.AddAttribute( strName, strValue ); } if (m_data[position] == c_text) { position++; String strText = GetString( ref position, bCreate ); if (bCreate) elCurrent.m_strText = strText; } while (m_data[position] != c_children) { SecurityElement elChild = InternalGetElement( ref position, bCreate ); if (bCreate) elCurrent.AddChild( elChild ); } position++; return elCurrent; } public String GetTagForElement( int position ) { if (m_data.Length <= position) throw new XmlSyntaxException(); if (m_data[position++] != c_element) throw new XmlSyntaxException(); String strTag = GetString( ref position ); return strTag; } public ArrayList GetChildrenPositionForElement( int position ) { if (m_data.Length <= position) throw new XmlSyntaxException(); if (m_data[position++] != c_element) throw new XmlSyntaxException(); ArrayList children = new ArrayList(); // This is to move past the tag string GetString( ref position ); while (m_data[position] == c_attribute) { position++; // Read name and value, then throw them away GetString( ref position, false ); GetString( ref position, false ); } if (m_data[position] == c_text) { position++; // Read text, then throw it away. GetString( ref position, false ); } while (m_data[position] != c_children) { children.Add( position ); InternalGetElement( ref position, false ); } position++; return children; } public String GetAttributeForElement( int position, String attributeName ) { if (m_data.Length <= position) throw new XmlSyntaxException(); if (m_data[position++] != c_element) throw new XmlSyntaxException(); String strRetValue = null; // This is to move past the tag string. GetString( ref position, false ); while (m_data[position] == c_attribute) { position++; String strName = GetString( ref position ); String strValue = GetString( ref position ); if (String.Equals( strName, attributeName )) { strRetValue = strValue; break; } } return strRetValue; } } }
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