Mercurial > hg > CbC > CbC_gcc
diff gcc/ada/libgnat/g-byorma.adb @ 111:04ced10e8804
gcc 7
| author | kono |
|---|---|
| date | Fri, 27 Oct 2017 22:46:09 +0900 |
| parents | |
| children | 84e7813d76e9 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/gcc/ada/libgnat/g-byorma.adb Fri Oct 27 22:46:09 2017 +0900 @@ -0,0 +1,195 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- G N A T . B Y T E _ O R D E R _ M A R K -- +-- -- +-- B o d y -- +-- -- +-- Copyright (C) 2006-2017, AdaCore -- +-- -- +-- 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. -- +-- -- +------------------------------------------------------------------------------ + +pragma Compiler_Unit_Warning; + +package body GNAT.Byte_Order_Mark is + + -------------- + -- Read_BOM -- + -------------- + + procedure Read_BOM + (Str : String; + Len : out Natural; + BOM : out BOM_Kind; + XML_Support : Boolean := False) + is + begin + -- Note: the order of these tests is important, because in some cases + -- one sequence is a prefix of a longer sequence, and we must test for + -- the longer sequence first + + -- UTF-32 (big-endian) + + if Str'Length >= 4 + and then Str (Str'First) = Character'Val (16#00#) + and then Str (Str'First + 1) = Character'Val (16#00#) + and then Str (Str'First + 2) = Character'Val (16#FE#) + and then Str (Str'First + 3) = Character'Val (16#FF#) + then + Len := 4; + BOM := UTF32_BE; + + -- UTF-32 (little-endian) + + elsif Str'Length >= 4 + and then Str (Str'First) = Character'Val (16#FF#) + and then Str (Str'First + 1) = Character'Val (16#FE#) + and then Str (Str'First + 2) = Character'Val (16#00#) + and then Str (Str'First + 3) = Character'Val (16#00#) + then + Len := 4; + BOM := UTF32_LE; + + -- UTF-16 (big-endian) + + elsif Str'Length >= 2 + and then Str (Str'First) = Character'Val (16#FE#) + and then Str (Str'First + 1) = Character'Val (16#FF#) + then + Len := 2; + BOM := UTF16_BE; + + -- UTF-16 (little-endian) + + elsif Str'Length >= 2 + and then Str (Str'First) = Character'Val (16#FF#) + and then Str (Str'First + 1) = Character'Val (16#FE#) + then + Len := 2; + BOM := UTF16_LE; + + -- UTF-8 (endian-independent) + + elsif Str'Length >= 3 + and then Str (Str'First) = Character'Val (16#EF#) + and then Str (Str'First + 1) = Character'Val (16#BB#) + and then Str (Str'First + 2) = Character'Val (16#BF#) + then + Len := 3; + BOM := UTF8_All; + + -- UCS-4 (big-endian) XML only + + elsif XML_Support + and then Str'Length >= 4 + and then Str (Str'First) = Character'Val (16#00#) + and then Str (Str'First + 1) = Character'Val (16#00#) + and then Str (Str'First + 2) = Character'Val (16#00#) + and then Str (Str'First + 3) = Character'Val (16#3C#) + then + Len := 0; + BOM := UCS4_BE; + + -- UCS-4 (little-endian) XML case + + elsif XML_Support + and then Str'Length >= 4 + and then Str (Str'First) = Character'Val (16#3C#) + and then Str (Str'First + 1) = Character'Val (16#00#) + and then Str (Str'First + 2) = Character'Val (16#00#) + and then Str (Str'First + 3) = Character'Val (16#00#) + then + Len := 0; + BOM := UCS4_LE; + + -- UCS-4 (unusual byte order 2143) XML case + + elsif XML_Support + and then Str'Length >= 4 + and then Str (Str'First) = Character'Val (16#00#) + and then Str (Str'First + 1) = Character'Val (16#00#) + and then Str (Str'First + 2) = Character'Val (16#3C#) + and then Str (Str'First + 3) = Character'Val (16#00#) + then + Len := 0; + BOM := UCS4_2143; + + -- UCS-4 (unusual byte order 3412) XML case + + elsif XML_Support + and then Str'Length >= 4 + and then Str (Str'First) = Character'Val (16#00#) + and then Str (Str'First + 1) = Character'Val (16#3C#) + and then Str (Str'First + 2) = Character'Val (16#00#) + and then Str (Str'First + 3) = Character'Val (16#00#) + then + Len := 0; + BOM := UCS4_3412; + + -- UTF-16 (big-endian) XML case + + elsif XML_Support + and then Str'Length >= 4 + and then Str (Str'First) = Character'Val (16#00#) + and then Str (Str'First + 1) = Character'Val (16#3C#) + and then Str (Str'First + 2) = Character'Val (16#00#) + and then Str (Str'First + 3) = Character'Val (16#3F#) + then + Len := 0; + BOM := UTF16_BE; + + -- UTF-32 (little-endian) XML case + + elsif XML_Support + and then Str'Length >= 4 + and then Str (Str'First) = Character'Val (16#3C#) + and then Str (Str'First + 1) = Character'Val (16#00#) + and then Str (Str'First + 2) = Character'Val (16#3F#) + and then Str (Str'First + 3) = Character'Val (16#00#) + then + Len := 0; + BOM := UTF16_LE; + + -- Unrecognized special encodings XML only + + elsif XML_Support + and then Str'Length >= 4 + and then Str (Str'First) = Character'Val (16#3C#) + and then Str (Str'First + 1) = Character'Val (16#3F#) + and then Str (Str'First + 2) = Character'Val (16#78#) + and then Str (Str'First + 3) = Character'Val (16#6D#) + then + -- UTF-8, ASCII, some part of ISO8859, Shift-JIS, EUC,... + + Len := 0; + BOM := Unknown; + + -- No BOM recognized + + else + Len := 0; + BOM := Unknown; + end if; + end Read_BOM; + +end GNAT.Byte_Order_Mark;