Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.ServiceModel/System/ServiceModel/XmlUtil.cs

@@ -0,0 +1,119 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+namespace System.ServiceModel
+{
+    using System.Runtime;
+    using System.Xml;
+
+    static class XmlUtil
+    {
+        public const string XmlNs = "http://www.w3.org/XML/1998/namespace";
+        public const string XmlNsNs = "http://www.w3.org/2000/xmlns/";
+
+        public static string GetXmlLangAttribute(XmlReader reader)
+        {
+            string xmlLang = null;
+            if (reader.MoveToAttribute("lang", XmlNs))
+            {
+                xmlLang = reader.Value;
+                reader.MoveToElement();
+            }
+
+            if (xmlLang == null)
+                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.XmlLangAttributeMissing)));
+
+            return xmlLang;
+        }
+
+        // FIX for 7455
+        public static bool IsTrue(string booleanValue)
+        {
+            if (string.IsNullOrEmpty(booleanValue))
+            {
+                return false;
+            }
+
+            return XmlConvert.ToBoolean(booleanValue);
+        }
+
+        public static void ReadContentAsQName(XmlReader reader, out string localName, out string ns)
+        {
+            ParseQName(reader, reader.ReadContentAsString(), out localName, out ns);
+        }
+
+        public static bool IsWhitespace(char ch)
+        {
+            return (ch == ' ' || ch == '\t' || ch == '\r' || ch == '\n');
+        }
+
+        public static string TrimEnd(string s)
+        {
+            int i;
+            for (i = s.Length; i > 0 && IsWhitespace(s[i - 1]); i--);
+
+            if (i != s.Length)
+            {
+                return s.Substring(0, i);
+            }
+
+            return s;
+        }
+
+        public static string TrimStart(string s)
+        {
+            int i;
+            for (i = 0; i < s.Length && IsWhitespace(s[i]); i++);
+
+            if (i != 0)
+            {
+                return s.Substring(i);
+            }
+
+            return s;
+        }
+
+        public static string Trim(string s)
+        {
+            int i;
+            for (i = 0; i < s.Length && IsWhitespace(s[i]); i++);
+
+            if (i >= s.Length)
+            {
+                return string.Empty;
+            }
+
+            int j;
+            for (j = s.Length; j > 0 && IsWhitespace(s[j - 1]); j--);
+
+            Fx.Assert(j > i, "Logic error in XmlUtil.Trim().");
+
+            if (i != 0 || j != s.Length)
+            {
+                return s.Substring(i, j - i);
+            }
+            return s;
+        }
+
+        public static void ParseQName(XmlReader reader, string qname, out string localName, out string ns)
+        {
+            int index = qname.IndexOf(':');
+            string prefix;
+            if (index < 0)
+            {
+                prefix = "";
+                localName = TrimStart(TrimEnd(qname));
+            }
+            else
+            {
+                if (index == qname.Length - 1)
+                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.InvalidXmlQualifiedName, qname)));
+                prefix = TrimStart(qname.Substring(0, index));
+                localName = TrimEnd(qname.Substring(index + 1));
+            }
+            ns = reader.LookupNamespace(prefix);
+            if (ns == null)
+                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.UnboundPrefixInQName, qname)));
+        }
+    }
+}