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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- I N T E R F A C E S . P A C K E D _ D E C I M A L --
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6 -- --
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7 -- B o d y --
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8 -- (Version for IBM Mainframe Packed Decimal Format) --
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9 -- --
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10 -- Copyright (C) 1992-2017, Free Software Foundation, Inc. --
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11 -- --
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12 -- GNAT is free software; you can redistribute it and/or modify it under --
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13 -- terms of the GNU General Public License as published by the Free Soft- --
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14 -- ware Foundation; either version 3, or (at your option) any later ver- --
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15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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17 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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18 -- --
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19 -- As a special exception under Section 7 of GPL version 3, you are granted --
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20 -- additional permissions described in the GCC Runtime Library Exception, --
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21 -- version 3.1, as published by the Free Software Foundation. --
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22 -- --
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23 -- You should have received a copy of the GNU General Public License and --
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24 -- a copy of the GCC Runtime Library Exception along with this program; --
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25 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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26 -- <http://www.gnu.org/licenses/>. --
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27 -- --
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28 -- GNAT was originally developed by the GNAT team at New York University. --
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29 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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30 -- --
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31 ------------------------------------------------------------------------------
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32
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33 with System; use System;
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34
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35 with Ada.Unchecked_Conversion;
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36
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37 package body Interfaces.Packed_Decimal is
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38
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39 type Packed is array (Byte_Length) of Unsigned_8;
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40 -- The type used internally to represent packed decimal
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41
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42 type Packed_Ptr is access Packed;
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43 function To_Packed_Ptr is
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44 new Ada.Unchecked_Conversion (Address, Packed_Ptr);
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45
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46 -- The following array is used to convert a value in the range 0-99 to
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47 -- a packed decimal format with two hexadecimal nibbles. It is worth
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48 -- using table look up in this direction because divides are expensive.
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49
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50 Packed_Byte : constant array (00 .. 99) of Unsigned_8 :=
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51 (16#00#, 16#01#, 16#02#, 16#03#, 16#04#,
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52 16#05#, 16#06#, 16#07#, 16#08#, 16#09#,
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53 16#10#, 16#11#, 16#12#, 16#13#, 16#14#,
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54 16#15#, 16#16#, 16#17#, 16#18#, 16#19#,
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55 16#20#, 16#21#, 16#22#, 16#23#, 16#24#,
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56 16#25#, 16#26#, 16#27#, 16#28#, 16#29#,
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57 16#30#, 16#31#, 16#32#, 16#33#, 16#34#,
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58 16#35#, 16#36#, 16#37#, 16#38#, 16#39#,
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59 16#40#, 16#41#, 16#42#, 16#43#, 16#44#,
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60 16#45#, 16#46#, 16#47#, 16#48#, 16#49#,
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61 16#50#, 16#51#, 16#52#, 16#53#, 16#54#,
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62 16#55#, 16#56#, 16#57#, 16#58#, 16#59#,
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63 16#60#, 16#61#, 16#62#, 16#63#, 16#64#,
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64 16#65#, 16#66#, 16#67#, 16#68#, 16#69#,
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65 16#70#, 16#71#, 16#72#, 16#73#, 16#74#,
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66 16#75#, 16#76#, 16#77#, 16#78#, 16#79#,
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67 16#80#, 16#81#, 16#82#, 16#83#, 16#84#,
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68 16#85#, 16#86#, 16#87#, 16#88#, 16#89#,
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69 16#90#, 16#91#, 16#92#, 16#93#, 16#94#,
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70 16#95#, 16#96#, 16#97#, 16#98#, 16#99#);
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71
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72 ---------------------
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73 -- Int32_To_Packed --
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74 ---------------------
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75
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76 procedure Int32_To_Packed (V : Integer_32; P : System.Address; D : D32) is
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77 PP : constant Packed_Ptr := To_Packed_Ptr (P);
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78 Empty_Nibble : constant Boolean := ((D rem 2) = 0);
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79 B : constant Byte_Length := (D / 2) + 1;
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80 VV : Integer_32 := V;
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81
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82 begin
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83 -- Deal with sign byte first
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84
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85 if VV >= 0 then
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86 PP (B) := Unsigned_8 (VV rem 10) * 16 + 16#C#;
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87 VV := VV / 10;
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88
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89 else
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90 VV := -VV;
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91 PP (B) := Unsigned_8 (VV rem 10) * 16 + 16#D#;
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92 end if;
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93
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94 for J in reverse B - 1 .. 2 loop
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95 if VV = 0 then
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96 for K in 1 .. J loop
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97 PP (K) := 16#00#;
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98 end loop;
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99
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100 return;
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101
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102 else
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103 PP (J) := Packed_Byte (Integer (VV rem 100));
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104 VV := VV / 100;
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105 end if;
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106 end loop;
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107
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108 -- Deal with leading byte
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109
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110 if Empty_Nibble then
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111 if VV > 9 then
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112 raise Constraint_Error;
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113 else
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114 PP (1) := Unsigned_8 (VV);
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115 end if;
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116
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117 else
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118 if VV > 99 then
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119 raise Constraint_Error;
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120 else
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121 PP (1) := Packed_Byte (Integer (VV));
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122 end if;
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123 end if;
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124
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125 end Int32_To_Packed;
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126
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127 ---------------------
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128 -- Int64_To_Packed --
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129 ---------------------
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130
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131 procedure Int64_To_Packed (V : Integer_64; P : System.Address; D : D64) is
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132 PP : constant Packed_Ptr := To_Packed_Ptr (P);
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133 Empty_Nibble : constant Boolean := ((D rem 2) = 0);
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134 B : constant Byte_Length := (D / 2) + 1;
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135 VV : Integer_64 := V;
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136
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137 begin
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138 -- Deal with sign byte first
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139
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140 if VV >= 0 then
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141 PP (B) := Unsigned_8 (VV rem 10) * 16 + 16#C#;
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142 VV := VV / 10;
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143
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144 else
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145 VV := -VV;
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146 PP (B) := Unsigned_8 (VV rem 10) * 16 + 16#D#;
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147 end if;
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148
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149 for J in reverse B - 1 .. 2 loop
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150 if VV = 0 then
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151 for K in 1 .. J loop
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152 PP (K) := 16#00#;
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153 end loop;
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154
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155 return;
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156
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157 else
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158 PP (J) := Packed_Byte (Integer (VV rem 100));
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159 VV := VV / 100;
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160 end if;
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161 end loop;
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162
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163 -- Deal with leading byte
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164
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165 if Empty_Nibble then
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166 if VV > 9 then
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167 raise Constraint_Error;
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168 else
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169 PP (1) := Unsigned_8 (VV);
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170 end if;
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171
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172 else
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173 if VV > 99 then
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174 raise Constraint_Error;
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175 else
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176 PP (1) := Packed_Byte (Integer (VV));
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177 end if;
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178 end if;
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179
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180 end Int64_To_Packed;
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181
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182 ---------------------
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183 -- Packed_To_Int32 --
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184 ---------------------
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185
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186 function Packed_To_Int32 (P : System.Address; D : D32) return Integer_32 is
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187 PP : constant Packed_Ptr := To_Packed_Ptr (P);
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188 Empty_Nibble : constant Boolean := ((D mod 2) = 0);
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189 B : constant Byte_Length := (D / 2) + 1;
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190 V : Integer_32;
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191 Dig : Unsigned_8;
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192 Sign : Unsigned_8;
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193 J : Positive;
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194
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195 begin
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196 -- Cases where there is an unused (zero) nibble in the first byte.
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197 -- Deal with the single digit nibble at the right of this byte
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198
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199 if Empty_Nibble then
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200 V := Integer_32 (PP (1));
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201 J := 2;
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202
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203 if V > 9 then
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204 raise Constraint_Error;
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205 end if;
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206
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207 -- Cases where all nibbles are used
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208
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209 else
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210 V := 0;
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211 J := 1;
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212 end if;
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213
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214 -- Loop to process bytes containing two digit nibbles
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215
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216 while J < B loop
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217 Dig := Shift_Right (PP (J), 4);
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218
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219 if Dig > 9 then
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220 raise Constraint_Error;
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221 else
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222 V := V * 10 + Integer_32 (Dig);
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223 end if;
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224
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225 Dig := PP (J) and 16#0F#;
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226
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227 if Dig > 9 then
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228 raise Constraint_Error;
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229 else
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230 V := V * 10 + Integer_32 (Dig);
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231 end if;
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232
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233 J := J + 1;
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234 end loop;
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235
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236 -- Deal with digit nibble in sign byte
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237
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238 Dig := Shift_Right (PP (J), 4);
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239
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240 if Dig > 9 then
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241 raise Constraint_Error;
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242 else
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243 V := V * 10 + Integer_32 (Dig);
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244 end if;
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245
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246 Sign := PP (J) and 16#0F#;
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247
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248 -- Process sign nibble (deal with most common cases first)
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249
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250 if Sign = 16#C# then
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251 return V;
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252
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253 elsif Sign = 16#D# then
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254 return -V;
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255
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256 elsif Sign = 16#B# then
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257 return -V;
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258
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259 elsif Sign >= 16#A# then
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260 return V;
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261
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262 else
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263 raise Constraint_Error;
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264 end if;
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265 end Packed_To_Int32;
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266
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267 ---------------------
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268 -- Packed_To_Int64 --
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269 ---------------------
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270
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271 function Packed_To_Int64 (P : System.Address; D : D64) return Integer_64 is
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272 PP : constant Packed_Ptr := To_Packed_Ptr (P);
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273 Empty_Nibble : constant Boolean := ((D mod 2) = 0);
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274 B : constant Byte_Length := (D / 2) + 1;
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275 V : Integer_64;
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276 Dig : Unsigned_8;
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277 Sign : Unsigned_8;
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278 J : Positive;
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279
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280 begin
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281 -- Cases where there is an unused (zero) nibble in the first byte.
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282 -- Deal with the single digit nibble at the right of this byte
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283
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284 if Empty_Nibble then
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285 V := Integer_64 (PP (1));
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286 J := 2;
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287
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288 if V > 9 then
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289 raise Constraint_Error;
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290 end if;
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291
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292 -- Cases where all nibbles are used
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293
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294 else
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295 J := 1;
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296 V := 0;
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297 end if;
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298
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299 -- Loop to process bytes containing two digit nibbles
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300
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301 while J < B loop
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302 Dig := Shift_Right (PP (J), 4);
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303
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304 if Dig > 9 then
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305 raise Constraint_Error;
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306 else
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307 V := V * 10 + Integer_64 (Dig);
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308 end if;
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309
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310 Dig := PP (J) and 16#0F#;
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311
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312 if Dig > 9 then
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313 raise Constraint_Error;
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314 else
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315 V := V * 10 + Integer_64 (Dig);
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316 end if;
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317
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318 J := J + 1;
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319 end loop;
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320
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321 -- Deal with digit nibble in sign byte
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322
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323 Dig := Shift_Right (PP (J), 4);
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324
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325 if Dig > 9 then
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326 raise Constraint_Error;
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327 else
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328 V := V * 10 + Integer_64 (Dig);
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329 end if;
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330
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331 Sign := PP (J) and 16#0F#;
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332
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333 -- Process sign nibble (deal with most common cases first)
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334
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335 if Sign = 16#C# then
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336 return V;
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337
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338 elsif Sign = 16#D# then
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339 return -V;
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340
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341 elsif Sign = 16#B# then
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342 return -V;
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343
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344 elsif Sign >= 16#A# then
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345 return V;
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346
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347 else
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348 raise Constraint_Error;
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349 end if;
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350 end Packed_To_Int64;
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351
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352 end Interfaces.Packed_Decimal;
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