353 lines
10 KiB
Ada
353 lines
10 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- 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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-- --
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-- B o d y --
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-- (Version for IBM Mainframe Packed Decimal Format) --
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-- --
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-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with System; use System;
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with Ada.Unchecked_Conversion;
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package body Interfaces.Packed_Decimal is
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type Packed is array (Byte_Length) of Unsigned_8;
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-- The type used internally to represent packed decimal
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type Packed_Ptr is access Packed;
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function To_Packed_Ptr is
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new Ada.Unchecked_Conversion (Address, Packed_Ptr);
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-- The following array is used to convert a value in the range 0-99 to
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-- a packed decimal format with two hexadecimal nibbles. It is worth
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-- using table look up in this direction because divides are expensive.
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Packed_Byte : constant array (00 .. 99) of Unsigned_8 :=
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(16#00#, 16#01#, 16#02#, 16#03#, 16#04#,
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16#05#, 16#06#, 16#07#, 16#08#, 16#09#,
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16#10#, 16#11#, 16#12#, 16#13#, 16#14#,
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16#15#, 16#16#, 16#17#, 16#18#, 16#19#,
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16#20#, 16#21#, 16#22#, 16#23#, 16#24#,
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16#25#, 16#26#, 16#27#, 16#28#, 16#29#,
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16#30#, 16#31#, 16#32#, 16#33#, 16#34#,
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16#35#, 16#36#, 16#37#, 16#38#, 16#39#,
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16#40#, 16#41#, 16#42#, 16#43#, 16#44#,
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16#45#, 16#46#, 16#47#, 16#48#, 16#49#,
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16#50#, 16#51#, 16#52#, 16#53#, 16#54#,
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16#55#, 16#56#, 16#57#, 16#58#, 16#59#,
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16#60#, 16#61#, 16#62#, 16#63#, 16#64#,
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16#65#, 16#66#, 16#67#, 16#68#, 16#69#,
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16#70#, 16#71#, 16#72#, 16#73#, 16#74#,
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16#75#, 16#76#, 16#77#, 16#78#, 16#79#,
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16#80#, 16#81#, 16#82#, 16#83#, 16#84#,
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16#85#, 16#86#, 16#87#, 16#88#, 16#89#,
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16#90#, 16#91#, 16#92#, 16#93#, 16#94#,
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16#95#, 16#96#, 16#97#, 16#98#, 16#99#);
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---------------------
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-- Int32_To_Packed --
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---------------------
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procedure Int32_To_Packed (V : Integer_32; P : System.Address; D : D32) is
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PP : constant Packed_Ptr := To_Packed_Ptr (P);
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Empty_Nibble : constant Boolean := ((D rem 2) = 0);
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B : constant Byte_Length := (D / 2) + 1;
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VV : Integer_32 := V;
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begin
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-- Deal with sign byte first
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if VV >= 0 then
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PP (B) := Unsigned_8 (VV rem 10) * 16 + 16#C#;
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VV := VV / 10;
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else
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VV := -VV;
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PP (B) := Unsigned_8 (VV rem 10) * 16 + 16#D#;
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end if;
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for J in reverse B - 1 .. 2 loop
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if VV = 0 then
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for K in 1 .. J loop
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PP (K) := 16#00#;
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end loop;
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return;
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else
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PP (J) := Packed_Byte (Integer (VV rem 100));
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VV := VV / 100;
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end if;
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end loop;
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-- Deal with leading byte
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if Empty_Nibble then
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if VV > 9 then
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raise Constraint_Error;
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else
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PP (1) := Unsigned_8 (VV);
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end if;
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else
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if VV > 99 then
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raise Constraint_Error;
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else
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PP (1) := Packed_Byte (Integer (VV));
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end if;
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end if;
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end Int32_To_Packed;
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---------------------
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-- Int64_To_Packed --
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---------------------
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procedure Int64_To_Packed (V : Integer_64; P : System.Address; D : D64) is
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PP : constant Packed_Ptr := To_Packed_Ptr (P);
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Empty_Nibble : constant Boolean := ((D rem 2) = 0);
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B : constant Byte_Length := (D / 2) + 1;
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VV : Integer_64 := V;
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begin
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-- Deal with sign byte first
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if VV >= 0 then
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PP (B) := Unsigned_8 (VV rem 10) * 16 + 16#C#;
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VV := VV / 10;
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else
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VV := -VV;
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PP (B) := Unsigned_8 (VV rem 10) * 16 + 16#D#;
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end if;
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for J in reverse B - 1 .. 2 loop
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if VV = 0 then
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for K in 1 .. J loop
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PP (K) := 16#00#;
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end loop;
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return;
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else
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PP (J) := Packed_Byte (Integer (VV rem 100));
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VV := VV / 100;
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end if;
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end loop;
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-- Deal with leading byte
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if Empty_Nibble then
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if VV > 9 then
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raise Constraint_Error;
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else
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PP (1) := Unsigned_8 (VV);
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end if;
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else
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if VV > 99 then
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raise Constraint_Error;
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else
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PP (1) := Packed_Byte (Integer (VV));
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end if;
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end if;
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end Int64_To_Packed;
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---------------------
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-- Packed_To_Int32 --
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---------------------
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function Packed_To_Int32 (P : System.Address; D : D32) return Integer_32 is
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PP : constant Packed_Ptr := To_Packed_Ptr (P);
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Empty_Nibble : constant Boolean := ((D mod 2) = 0);
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B : constant Byte_Length := (D / 2) + 1;
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V : Integer_32;
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Dig : Unsigned_8;
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Sign : Unsigned_8;
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J : Positive;
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begin
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-- Cases where there is an unused (zero) nibble in the first byte.
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-- Deal with the single digit nibble at the right of this byte
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if Empty_Nibble then
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V := Integer_32 (PP (1));
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J := 2;
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if V > 9 then
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raise Constraint_Error;
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end if;
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-- Cases where all nibbles are used
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else
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V := 0;
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J := 1;
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end if;
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-- Loop to process bytes containing two digit nibbles
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while J < B loop
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Dig := Shift_Right (PP (J), 4);
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if Dig > 9 then
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raise Constraint_Error;
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else
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V := V * 10 + Integer_32 (Dig);
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end if;
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Dig := PP (J) and 16#0F#;
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if Dig > 9 then
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raise Constraint_Error;
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else
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V := V * 10 + Integer_32 (Dig);
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end if;
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J := J + 1;
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end loop;
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-- Deal with digit nibble in sign byte
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Dig := Shift_Right (PP (J), 4);
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if Dig > 9 then
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raise Constraint_Error;
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else
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V := V * 10 + Integer_32 (Dig);
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end if;
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Sign := PP (J) and 16#0F#;
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-- Process sign nibble (deal with most common cases first)
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if Sign = 16#C# then
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return V;
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elsif Sign = 16#D# then
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return -V;
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elsif Sign = 16#B# then
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return -V;
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elsif Sign >= 16#A# then
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return V;
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else
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raise Constraint_Error;
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end if;
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end Packed_To_Int32;
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---------------------
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-- Packed_To_Int64 --
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---------------------
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function Packed_To_Int64 (P : System.Address; D : D64) return Integer_64 is
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PP : constant Packed_Ptr := To_Packed_Ptr (P);
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Empty_Nibble : constant Boolean := ((D mod 2) = 0);
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B : constant Byte_Length := (D / 2) + 1;
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V : Integer_64;
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Dig : Unsigned_8;
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Sign : Unsigned_8;
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J : Positive;
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begin
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-- Cases where there is an unused (zero) nibble in the first byte.
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-- Deal with the single digit nibble at the right of this byte
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if Empty_Nibble then
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V := Integer_64 (PP (1));
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J := 2;
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if V > 9 then
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raise Constraint_Error;
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end if;
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-- Cases where all nibbles are used
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else
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J := 1;
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V := 0;
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end if;
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-- Loop to process bytes containing two digit nibbles
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while J < B loop
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Dig := Shift_Right (PP (J), 4);
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if Dig > 9 then
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raise Constraint_Error;
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else
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V := V * 10 + Integer_64 (Dig);
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end if;
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Dig := PP (J) and 16#0F#;
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if Dig > 9 then
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raise Constraint_Error;
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else
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V := V * 10 + Integer_64 (Dig);
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end if;
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J := J + 1;
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end loop;
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-- Deal with digit nibble in sign byte
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Dig := Shift_Right (PP (J), 4);
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if Dig > 9 then
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raise Constraint_Error;
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else
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V := V * 10 + Integer_64 (Dig);
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end if;
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Sign := PP (J) and 16#0F#;
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-- Process sign nibble (deal with most common cases first)
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if Sign = 16#C# then
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return V;
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elsif Sign = 16#D# then
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return -V;
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elsif Sign = 16#B# then
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return -V;
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elsif Sign >= 16#A# then
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return V;
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else
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raise Constraint_Error;
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end if;
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end Packed_To_Int64;
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end Interfaces.Packed_Decimal;
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