Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / _UncName.cs / 1 / _UncName.cs
#if !PLATFORM_UNIX //------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- using System.Globalization; namespace System { // The class designed as to keep minimal the working set of Uri class. // The idea is to stay with static helper methods and strings internal class UncNameHelper { // fields internal const int MaximumInternetNameLength = 256; private UncNameHelper() { } // properties // methods internal static string ParseCanonicalName(string str, int start, int end, ref bool loopback) { return DomainNameHelper.ParseCanonicalName(str, start, end, ref loopback); } // // IsValid // // // ATTN: This class has been re-designed as to conform to XP+ UNC hostname format // It is now similar to DNS name but can contain Unicode characters as well // This class will be removed and replaced by IDN specification later, // but for now we violate URI RFC cause we never escape Unicode characters on the wire // For the same reason we never unescape UNC host names since we never accept // them in escaped format. // // // Valid UNC server name chars: // a Unicode Letter (not allowed as the only in a segment) // a Latin-1 digit // '-' 45 0x2D // '.' 46 0x2E (only as a host domain delimiter) // '_' 95 0x5F // // // Assumption is the caller will check on the resulting name length // Remarks: MUST NOT be used unless all input indexes are are verified and trusted. internal unsafe static bool IsValid(char* name, ushort start, ref int returnedEnd, bool notImplicitFile) { ushort end = (ushort) returnedEnd; if (start==end) return false; // // First segment could consist of only '_' or '-' but it cannot be all digits or empty // bool validShortName = false; ushort i = start; for (; i < end; ++i) { if (name[i] == '/' || name[i] == '\\' || (notImplicitFile && (name[i] == ':' || name[i] == '?' || name[i] == '#'))) { end = i; break; } else if (name[i] == '.') { ++i; break; } if (Char.IsLetter(name[i]) || name[i] == '-' || name[i] == '_') { validShortName = true; } else if (name[i] < '0' || name[i] > '9') return false; } if (!validShortName) return false; // // Subsequent segments must start with a letter or a digit // for (; i < end; ++i) { if (name[i] == '/' || name[i] == '\\' || (notImplicitFile && (name[i] == ':' || name[i] == '?' || name[i] == '#'))) { end = i; break; } else if (name[i] == '.') { if (!validShortName || ((i-1) >= start && name[i-1] == '.')) return false; validShortName = false; } else if (name[i] == '-' || name[i] == '_') { if (!validShortName) return false; } else if (Char.IsLetter(name[i]) || (name[i] >= '0' && name[i] <= '9')) { if (!validShortName) validShortName = true; } else return false; } // last segment can end with the dot if (((i-1) >= start && name[i-1] == '.')) validShortName = true; if (!validShortName) return false; // caller must check for (end - start <= MaximumInternetNameLength) returnedEnd = end; return true; } } } #endif // !PLATFORM_UNIX
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