mcs/class/FirebirdSql.Data.Firebird/FirebirdSql.Data.Common/TypeEncoder.cs

   1 /*
   2  *  Firebird ADO.NET Data provider for .NET and Mono
   3  *
   4  *     The contents of this file are subject to the Initial
   5  *     Developer's Public License Version 1.0 (the "License");
   6  *     you may not use this file except in compliance with the
   7  *     License. You may obtain a copy of the License at
   8  *     http://www.firebirdsql.org/index.php?op=doc&id=idpl
   9  *
  10  *     Software distributed under the License is distributed on
  11  *     an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either
  12  *     express or implied.  See the License for the specific
  13  *     language governing rights and limitations under the License.
  14  *
  15  *  Copyright (c) 2002, 2005 Carlos Guzman Alvarez
  16  *  All Rights Reserved.
  17  */
  18
  19 using System;
  20 using System.Globalization;
  21
  22 namespace FirebirdSql.Data.Common
  23 {
  24         internal sealed class TypeEncoder
  25         {
  26                 #region Constructors
  27
  28                 private TypeEncoder()
  29                 {
  30                 }
  31
  32                 #endregion
  33
  34                 #region Static Methods
  35
  36                 public static object EncodeDecimal(decimal d, int scale, int sqltype)
  37                 {
  38                         long multiplier = 1;
  39
  40                         if (scale < 0)
  41                         {
  42                                 multiplier = (long)System.Math.Pow(10, scale * (-1));
  43                         }
  44
  45                         switch (sqltype & ~1)
  46                         {
  47                                 case IscCodes.SQL_SHORT:
  48                                         return (short)(d * multiplier);
  49
  50                                 case IscCodes.SQL_LONG:
  51                                         return (int)(d * multiplier);
  52
  53                                 case IscCodes.SQL_QUAD:
  54                                 case IscCodes.SQL_INT64:
  55                                         return (long)(d * multiplier);
  56
  57                                 case IscCodes.SQL_DOUBLE:
  58                                 default:
  59                                         return d;
  60                         }
  61                 }
  62
  63                 public static int EncodeTime(DateTime d)
  64                 {
  65                         GregorianCalendar calendar = new GregorianCalendar();
  66
  67                         int millisInDay =
  68                                 (int)(calendar.GetHour(d) * 3600000 +
  69                                 calendar.GetMinute(d) * 60000 +
  70                                 calendar.GetSecond(d) * 1000 +
  71                                 calendar.GetMilliseconds(d)) * 10;
  72
  73                         return millisInDay;
  74                 }
  75
  76                 public static int EncodeDate(DateTime d)
  77                 {
  78                         int day, month, year;
  79                         int c, ya;
  80
  81                         GregorianCalendar calendar = new GregorianCalendar();
  82
  83                         day = calendar.GetDayOfMonth(d);
  84                         month = calendar.GetMonth(d);
  85                         year = calendar.GetYear(d);
  86
  87                         if (month > 2)
  88                         {
  89                                 month -= 3;
  90                         }
  91                         else
  92                         {
  93                                 month += 9;
  94                                 year -= 1;
  95                         }
  96
  97                         c = year / 100;
  98                         ya = year - 100 * c;
  99
 100                         return ((146097 * c) / 4 +
 101                                 (1461 * ya) / 4 +
 102                                 (153 * month + 2) / 5 +
 103                                 day + 1721119 - 2400001);
 104                 }
 105
 106                 #endregion
 107         }
 108 }