------------------------------------------------------------------------------
------------------------------------------------------------------------------
-- This file is part of 'CRC32'                                             --
--                                                                          --
-- You do not have, nor can you ever acquire the right to use, copy or      --
-- distribute this software ; Should you use this software for any purpose, --
-- or copy and distribute it to anyone or in any manner, you are breaking   --
-- the laws of whatever soi-disant jurisdiction, and you promise to         --
-- continue doing so for the indefinite future. In any case, please         --
-- always : read and understand any software ; verify any PGP signatures    --
-- that you use - for any purpose.                                          --
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-- See also http://trilema.com/2015/a-new-software-licensing-paradigm .     --
------------------------------------------------------------------------------
------------------------------------------------------------------------------

  -- Edge testing for the CRC32 implementation
  -- S.MG, 2018

with Ada.Text_IO; use Ada.Text_IO;
with Interfaces; use Interfaces;
with CRC32;


procedure Test_CRC32_Edge is
  Empty : constant Character := Character'Val(0);
  Full : constant Character := Character'Val(16#FF#);
  
  S0 : String := Empty & Empty & Empty & Empty;
  S255 : String := Full & Full & Full & Full;
  
  S0F : String := Character'Val(16#0F#) & Character'Val(16#0F#);
  SF0 : String := Character'Val(16#F0#) & Character'Val(16#F0#);

  C : CRC32.CRC32 := 0;
begin
  -- First some tests, independent of the bit order
  C := CRC32.CRC(S0);
  pragma Assert(C = 558161692,  
      "Test_CRC32_Edge - assert 1 - C is " & CRC32.CRC32'Image(C) 
      & " should be 558161692");
  C := CRC32.CRC(S255);
  pragma Assert(C = 16#FFFFFFFF#,  
      "Test_CRC32_Edge - assert 2 - C is " & CRC32.CRC32'Image(C) 
      & " should be 4294967295");
  C := CRC32.CRC(S0(1 .. 1));
  pragma Assert(C = 3523407757,  
      "Test_CRC32_Edge - assert 3 - C is " & CRC32.CRC32'Image(C)
      & " should be 3523407757");
  C := CRC32.CRC(S0(1 .. 2));
  pragma Assert(C = 1104745215,  
      "Test_CRC32_Edge - assert 4 - C is " & CRC32.CRC32'Image(C) 
      & " should be 1104745215");

  -- The bitorder in CRC32 is reversed, check if implemented correctly
  C := CRC32.CRC(S0F);
  pragma Assert(C = 1459491745,  
      "Test_CRC32_Edge - assert 5 - C is " & CRC32.CRC32'Image(C) 
      & " should be 1459491745");
      
  C := CRC32.CRC(SF0);
  pragma Assert(C = 3906470238,  
      "Test_CRC32_Edge - assert 6 - C is " & CRC32.CRC32'Image(C) 
      & " should be 3906470238");
  
  
end Test_CRC32_Edge;