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