Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Util / ParseHttpDate.cs / 1 / ParseHttpDate.cs
using System; using System.Globalization; namespace System.Web.Util { internal static class HttpDate { static readonly int[] s_tensDigit = new int[10] { 0, 10, 20, 30, 40, 50, 60, 70, 80, 90 }; /*++ Converts a 2 character string to integer Arguments: s String to convert Returns: numeric equivalent, 0 on failure. --*/ static int atoi2(string s, int startIndex) { try { int tens = s[0 + startIndex] - '0'; int ones = s[1 + startIndex] - '0'; return s_tensDigit[tens] + ones; } catch { throw new FormatException(SR.GetString(SR.Atio2BadString, s, startIndex)); } } static readonly string[] s_days = new string [7] { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" }; static readonly string[] s_months = new string[12] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; // Custom table for make_month() for mapping "Apr" to 4 static readonly sbyte[] s_monthIndexTable = new sbyte[64] { -1, (sbyte)'A', 2, 12, -1, -1, -1, 8, // A to G -1, -1, -1, -1, 7, -1, (sbyte)'N', -1, // H to O 9, -1, (sbyte)'R', -1, 10, -1, 11, -1, // P to W -1, 5, -1, -1, -1, -1, -1, -1, // X to Z -1, (sbyte)'A', 2, 12, -1, -1, -1, 8, // a to g -1, -1, -1, -1, 7, -1, (sbyte)'N', -1, // h to o 9, -1, (sbyte)'R', -1, 10, -1, 11, -1, // p to w -1, 5, -1, -1, -1, -1, -1, -1 // x to z }; static int make_month(string s, int startIndex) { int i; sbyte monthIndex; string monthString; // // use the third character as the index // i = ((int) s[2 + startIndex] - 0x40) & 0x3F; monthIndex = s_monthIndexTable[i]; if ( monthIndex >= 13 ) { // // ok, we need to look at the second character // if ( monthIndex == (sbyte) 'N' ) { // // we got an N which we need to resolve further // // // if s[1] is 'u' then Jun, if 'a' then Jan // if ( s_monthIndexTable[(s[1 + startIndex]-0x40) & 0x3f] == (sbyte) 'A' ) { monthIndex = 1; } else { monthIndex = 6; } } else if ( monthIndex == (sbyte) 'R' ) { // // if s[1] is 'a' then March, if 'p' then April // if ( s_monthIndexTable[(s[1 + startIndex]-0x40) & 0x3f] == (sbyte) 'A' ) { monthIndex = 3; } else { monthIndex = 4; } } else { throw new FormatException(SR.GetString(SR.MakeMonthBadString, s, startIndex)); } } monthString = s_months[monthIndex-1]; if ( (s[0 + startIndex] == monthString[0]) && (s[1 + startIndex] == monthString[1]) && (s[2 + startIndex] == monthString[2]) ) { return(monthIndex); } else if ( ((Char.ToUpper(s[0 + startIndex], CultureInfo.InvariantCulture)) == monthString[0]) && ((Char.ToLower(s[1 + startIndex], CultureInfo.InvariantCulture)) == monthString[1]) && ((Char.ToLower(s[2 + startIndex], CultureInfo.InvariantCulture)) == monthString[2]) ) { return monthIndex; } throw new FormatException(SR.GetString(SR.MakeMonthBadString, s, startIndex)); } // make_month /*++ Converts a string representation of a GMT time (three different varieties) to an NT representation of a file time. We handle the following variations: Sun, 06 Nov 1994 08:49:37 GMT (RFC 822 updated by RFC 1123) Sunday, 06-Nov-94 08:49:37 GMT (RFC 850) Sun Nov 06 08:49:37 1994 (ANSI C's asctime() format Arguments: time String representation of time field Returns: TRUE on success and FALSE on failure. History: Johnl 24-Jan-1995 Modified from WWW library --*/ static internal DateTime UtcParse(string time) { int i; int year, month, day, hour, minute, second; if (time == null) { throw new ArgumentNullException("time"); } if ((i = time.IndexOf(',')) != -1) { // // Thursday, 10-Jun-93 01:29:59 GMT // or: Thu, 10 Jan 1993 01:29:59 GMT */ // int length = time.Length - i; while (--length > 0 && time[++i] == ' ') ; if (time[i+2] == '-' ) { /* First format */ if (length < 18) { throw new FormatException(SR.GetString(SR.UtilParseDateTimeBad, time)); } day = atoi2(time, i); month = make_month(time, i + 3); year = atoi2(time, i + 7); if ( year < 50 ) { year += 2000; } else { year += 1900; } hour = atoi2(time, i + 10); minute = atoi2(time, i + 13); second = atoi2(time, i +16); } else { /* Second format */ if (length < 20) { throw new FormatException(SR.GetString(SR.UtilParseDateTimeBad, time)); } day = atoi2(time, i); month = make_month(time, i + 3); year = atoi2(time, i + 7) * 100 + atoi2(time, i + 9); hour = atoi2(time, i + 12); minute = atoi2(time, i + 15); second = atoi2(time, i + 18); } } else { /* Try the other format: Wed Jun 09 01:29:59 1993 GMT */ i = -1; int length = time.Length + 1; while (--length > 0 && time[++i] == ' '); if (length < 24) { throw new FormatException(SR.GetString(SR.UtilParseDateTimeBad, time)); } day = atoi2(time, i + 8); month = make_month(time, i + 4); year = atoi2(time, i + 20) * 100 + atoi2(time, i + 22); hour = atoi2(time, i + 11); minute = atoi2(time, i + 14); second = atoi2(time, i + 17); } return new DateTime(year, month, day, hour, minute, second); } } }
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