Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Util / CodePageUtils.cs / 1 / CodePageUtils.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.Util { using System.Collections; // // Utility class to help with determining if a given code page // is ASCII compatible (preserves 0-127 Unicode characters as is) // internal static class CodePageUtils { /* The following array of ASCII compatible code pages is generated by running this code on a machine that has _many_ codepages installed: using System; using System.Collections; using System.Text; public class qq { public static void Main(string[] args) { ArrayList list = new ArrayList(); byte[] bb = new byte[128]; for (int i = 0; i < 128; i++) bb[i] = (byte)i; String asciiString = Encoding.ASCII.GetString(bb); for (int i = 1; i < 100000; i++) { try { Encoding e = Encoding.GetEncoding(i); byte[] xx = e.GetBytes(asciiString); if (xx.Length == 128) { bool good = true; for (int j = 0; j < 128; j++) { if (bb[j] != xx[j]) { good = false; break; } } if (good) list.Add(i); } } catch {} } int n = list.Count; Console.Write("private const int[] _asciiCompatCodePages = new int[" + n + "] {\r\n "); for (int i = 0; i < n; i++) { Console.Write("{0,5}", list[i]); if (i < n-1) Console.Write(", "); if (((i+1) % 10) == 0) Console.Write("\r\n "); } Console.Write("\r\n};\r\n"); } } */ private static int[] _asciiCompatCodePages = new int[79] { 437, 708, 720, 737, 775, 850, 852, 855, 857, 858, 860, 861, 862, 863, 864, 865, 866, 869, 874, 932, 936, 949, 950, 1250, 1251, 1252, 1253, 1254, 1255, 1256, 1257, 1258, 1361, 10000, 10001, 10002, 10003, 10004, 10005, 10006, 10007, 10008, 10010, 10017, 10029, 10079, 10081, 10082, 20000, 20001, 20002, 20003, 20004, 20005, 20127, 20866, 20932, 20936, 20949, 21866, 28591, 28592, 28593, 28594, 28595, 28596, 28597, 28598, 28599, 28605, 38598, 50220, 50221, 50222, 50225, 50227, 51932, 51949, 65001 }; internal /*public*/ static bool IsAsciiCompatibleCodePage(int codepage) { //alternatives to binary search considered //Hashtable: static initialization increases startup up, perf relative //Byte array would consume ~8K, but lookups constant //with 80 entries, binary search limited to 7 indexes into array int lo = 0; int hi = 78; while(lo <= hi) { int i = (lo + hi) >> 1; int c; c = _asciiCompatCodePages[i] - codepage; if (c == 0) return true; //i is the index of the item if (c < 0) { lo = i + 1; } else { hi = i - 1; } } return false; //lo is the index of the item immediately after //~lo returned in some implementations for false indicator with additional info } internal const int CodePageUT8 = 65001; } }
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