ConfigPathUtility.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Misc / ConfigPathUtility.cs / 1 / ConfigPathUtility.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Configuration { 
 
#if CONFIGPATHUTILITY_SYSTEMWEB
    using Debug=System.Web.Util.Debug; 
#endif

    internal static class ConfigPathUtility {
        private const char SeparatorChar = '/'; 

        // 
        // A configPath is valid if 
        //  * It does not start or end with a '/'
        //  * It is not null or empty, except in the case of the root configuration record 
        //  * It does not contain '\'
        //  * It does not contain a path component equal to "." or ".."
        //
        // The checks for '\', ".", and ".." are not strictly necessary, but their presence 
        // could lead to problems for configuration hosts.
        // 
        static internal bool IsValid(string configPath) { 
            if (String.IsNullOrEmpty(configPath)) {
                return false; 
            }

            int start = -1;
            for (int examine = 0; examine <= configPath.Length; examine++) { 
                char ch;
 
                if (examine < configPath.Length) { 
                    ch = configPath[examine];
                } 
                else {
                    ch = SeparatorChar;
                }
 
                // backslash disallowed
                if (ch == '\\') { 
                    return false; 
                }
 
                if (ch == SeparatorChar) {
                    // double slash disallowed
                    // note this check also purposefully catches starting and ending slash
                    if (examine == start + 1) { 
                        return false;
                    } 
 
                    // "." disallowed
                    if (examine == start + 2 && configPath[start + 1] == '.') { 
                        return false;
                    }

                    // ".." disallowed 
                    if (examine == start + 3 && configPath[start + 1] == '.' && configPath[start + 2] == '.') {
                        return false; 
                    } 

                    start = examine; 
                }
            }

            return true; 
        }
 
#if !CONFIGPATHUTILITY_SYSTEMWEB 
        static internal string Combine(string parentConfigPath, string childConfigPath) {
            Debug.Assert(String.IsNullOrEmpty(parentConfigPath) || IsValid(parentConfigPath), "String.IsNullOrEmpty(parentConfigPath) || IsValid(parentConfigPath)"); 
            Debug.Assert(String.IsNullOrEmpty(childConfigPath) || IsValid(childConfigPath), "String.IsNullOrEmpty(childConfigPath) || IsValid(childConfigPath)");

            if (String.IsNullOrEmpty(parentConfigPath)) {
                return childConfigPath; 
            }
 
            if (String.IsNullOrEmpty(childConfigPath)) { 
                return parentConfigPath;
            } 

            return parentConfigPath + "/" + childConfigPath;
        }
 
        static internal string[] GetParts(string configPath) {
            Debug.Assert(IsValid(configPath), "IsValid(configPath)"); 
 
            string[] parts = configPath.Split(SeparatorChar);
            return parts; 
        }

        //
        // Return the last part of a config path, e.g. 
        //   GetName("MACHINE/WEBROOT/Default Web Site/app") == "app"
        // 
        static internal string GetName(string configPath) { 
            Debug.Assert(String.IsNullOrEmpty(configPath) || IsValid(configPath), "String.IsNullOrEmpty(configPath) || IsValid(configPath)");
 
            if (String.IsNullOrEmpty(configPath)) {
                return configPath;
            }
 
            int index = configPath.LastIndexOf('/');
            if (index == -1) { 
                return configPath; 
            }
 
            Debug.Assert(index != configPath.Length - 1);
            return configPath.Substring(index + 1);
        }
#endif 

// Avoid unused code warning in System.Configuration by including functions in assembly-specific #defines 
#if CONFIGPATHUTILITY_SYSTEMWEB 
        static internal string GetParent(string configPath) {
            Debug.Assert(String.IsNullOrEmpty(configPath) || IsValid(configPath), "String.IsNullOrEmpty(configPath) || IsValid(configPath)"); 

            if (String.IsNullOrEmpty(configPath)) {
                return null;
            } 

            string parentConfigPath; 
            int lastSlash = configPath.LastIndexOf(SeparatorChar); 
            if (lastSlash == -1) {
                parentConfigPath = null; 
            }
            else {
                parentConfigPath = configPath.Substring(0, lastSlash);
            } 

            return parentConfigPath; 
        } 
#endif
    } 
}

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