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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- S Y S T E M . W C H _ J I S --
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6 -- --
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7 -- B o d y --
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8 -- --
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131
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9 -- Copyright (C) 1992-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 pragma Compiler_Unit_Warning;
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33
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34 package body System.WCh_JIS is
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35
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36 type Byte is mod 256;
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37
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38 EUC_Hankaku_Kana : constant Byte := 16#8E#;
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39 -- Prefix byte in EUC for Hankaku Kana (small Katakana). Such characters
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40 -- in EUC are represented by a prefix byte followed by the code, which
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41 -- is in the upper half (the corresponding JIS internal code is in the
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42 -- range 16#0080# - 16#00FF#).
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43
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44 function EUC_To_JIS (EUC1, EUC2 : Character) return Wide_Character is
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45 EUC1B : constant Byte := Character'Pos (EUC1);
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46 EUC2B : constant Byte := Character'Pos (EUC2);
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47
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48 begin
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49 if EUC2B not in 16#A0# .. 16#FE# then
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50 raise Constraint_Error;
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51 end if;
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52
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53 if EUC1B = EUC_Hankaku_Kana then
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54 return Wide_Character'Val (EUC2B);
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55
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56 else
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57 if EUC1B not in 16#A0# .. 16#FE# then
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58 raise Constraint_Error;
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59 else
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60 return Wide_Character'Val
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61 (256 * Natural (EUC1B and 16#7F#) + Natural (EUC2B and 16#7F#));
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62 end if;
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63 end if;
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64 end EUC_To_JIS;
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65
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66 ----------------
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67 -- JIS_To_EUC --
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68 ----------------
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69
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70 procedure JIS_To_EUC
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71 (J : Wide_Character;
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72 EUC1 : out Character;
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73 EUC2 : out Character)
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74 is
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75 JIS1 : constant Natural := Wide_Character'Pos (J) / 256;
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76 JIS2 : constant Natural := Wide_Character'Pos (J) rem 256;
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77
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78 begin
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79 -- Special case of small Katakana
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80
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81 if JIS1 = 0 then
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82
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83 -- The value must be in the range 16#80# to 16#FF# so that the upper
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84 -- bit is set in both bytes.
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85
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86 if JIS2 < 16#80# then
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87 raise Constraint_Error;
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88 end if;
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89
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90 EUC1 := Character'Val (EUC_Hankaku_Kana);
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91 EUC2 := Character'Val (JIS2);
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92
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93 -- The upper bit of both characters must be clear, or this is not
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94 -- a valid character for representation in EUC form.
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95
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96 elsif JIS1 > 16#7F# or else JIS2 > 16#7F# then
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97 raise Constraint_Error;
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98
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99 -- Result is just the two characters with upper bits set
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100
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101 else
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102 EUC1 := Character'Val (JIS1 + 16#80#);
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103 EUC2 := Character'Val (JIS2 + 16#80#);
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104 end if;
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105 end JIS_To_EUC;
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106
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107 ----------------------
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108 -- JIS_To_Shift_JIS --
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109 ----------------------
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110
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111 procedure JIS_To_Shift_JIS
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112 (J : Wide_Character;
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113 SJ1 : out Character;
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114 SJ2 : out Character)
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115 is
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116 JIS1 : Byte;
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117 JIS2 : Byte;
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118
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119 begin
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120 -- The following is the required algorithm, it's hard to make any
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121 -- more intelligent comments. This was copied from a public domain
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122 -- C program called etos.c (author unknown).
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123
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124 JIS1 := Byte (Natural (Wide_Character'Pos (J) / 256));
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125 JIS2 := Byte (Natural (Wide_Character'Pos (J) rem 256));
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126
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127 if JIS1 > 16#5F# then
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128 JIS1 := JIS1 + 16#80#;
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129 end if;
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130
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131 if (JIS1 mod 2) = 0 then
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132 SJ1 := Character'Val ((JIS1 - 16#30#) / 2 + 16#88#);
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133 SJ2 := Character'Val (JIS2 + 16#7E#);
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134
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135 else
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136 if JIS2 >= 16#60# then
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137 JIS2 := JIS2 + 16#01#;
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138 end if;
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139
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140 SJ1 := Character'Val ((JIS1 - 16#31#) / 2 + 16#89#);
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141 SJ2 := Character'Val (JIS2 + 16#1F#);
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142 end if;
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143 end JIS_To_Shift_JIS;
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144
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145 ----------------------
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146 -- Shift_JIS_To_JIS --
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147 ----------------------
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148
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149 function Shift_JIS_To_JIS (SJ1, SJ2 : Character) return Wide_Character is
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150 SJIS1 : Byte;
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151 SJIS2 : Byte;
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152 JIS1 : Byte;
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153 JIS2 : Byte;
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154
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155 begin
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156 -- The following is the required algorithm, it's hard to make any
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157 -- more intelligent comments. This was copied from a public domain
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158 -- C program called stoj.c written by shige@csk.JUNET.
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159
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160 SJIS1 := Character'Pos (SJ1);
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161 SJIS2 := Character'Pos (SJ2);
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162
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163 if SJIS1 >= 16#E0# then
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164 SJIS1 := SJIS1 - 16#40#;
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165 end if;
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166
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167 if SJIS2 >= 16#9F# then
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168 JIS1 := (SJIS1 - 16#88#) * 2 + 16#30#;
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169 JIS2 := SJIS2 - 16#7E#;
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170
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171 else
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172 if SJIS2 >= 16#7F# then
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173 SJIS2 := SJIS2 - 16#01#;
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174 end if;
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175
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176 JIS1 := (SJIS1 - 16#89#) * 2 + 16#31#;
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177 JIS2 := SJIS2 - 16#1F#;
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178 end if;
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179
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180 if JIS1 not in 16#20# .. 16#7E#
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181 or else JIS2 not in 16#20# .. 16#7E#
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182 then
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183 raise Constraint_Error;
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184 else
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185 return Wide_Character'Val (256 * Natural (JIS1) + Natural (JIS2));
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186 end if;
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187 end Shift_JIS_To_JIS;
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188
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189 end System.WCh_JIS;
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