mirror of
https://github.com/AdaCore/xmlada.git
synced 2026-02-12 12:30:28 -08:00
213 lines
7.9 KiB
Ada
213 lines
7.9 KiB
Ada
------------------------------------------------------------------------------
|
|
-- XML/Ada - An XML suite for Ada95 --
|
|
-- --
|
|
-- Copyright (C) 2001-2017, AdaCore --
|
|
-- --
|
|
-- This library is free software; you can redistribute it and/or modify it --
|
|
-- under terms of the GNU General Public License as published by the Free --
|
|
-- Software Foundation; either version 3, or (at your option) any later --
|
|
-- version. This library is distributed in the hope that it will be useful, --
|
|
-- but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN- --
|
|
-- TABILITY 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/>. --
|
|
-- --
|
|
------------------------------------------------------------------------------
|
|
|
|
package body Unicode.CES is
|
|
|
|
--------------
|
|
-- Read_Bom --
|
|
--------------
|
|
|
|
procedure Read_Bom
|
|
(Str : String;
|
|
Len : out Natural;
|
|
BOM : out Bom_Type;
|
|
XML_Support : Boolean := True) is
|
|
begin
|
|
if 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;
|
|
|
|
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;
|
|
|
|
elsif 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;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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
|
|
-- Utf8, ASCII, some part of ISO8859, Shift-JIS, EUC,...
|
|
Len := 0;
|
|
BOM := Unknown;
|
|
|
|
else
|
|
Len := 0;
|
|
BOM := Unknown;
|
|
end if;
|
|
end Read_Bom;
|
|
|
|
--------------
|
|
-- Write_Bom --
|
|
--------------
|
|
|
|
function Write_Bom (BOM : Bom_Type) return String is
|
|
begin
|
|
case BOM is
|
|
when Utf16_LE =>
|
|
return Character'Val (16#FF#) & Character'Val (16#FE#);
|
|
when Utf16_BE =>
|
|
return Character'Val (16#FE#) & Character'Val (16#FF#);
|
|
when Utf32_LE =>
|
|
return Character'Val (16#FF#) & Character'Val (16#FE#)
|
|
& Character'Val (16#00#) & Character'Val (16#00#);
|
|
when Utf32_BE =>
|
|
return Character'Val (16#00#) & Character'Val (16#00#)
|
|
& Character'Val (16#FE#) & Character'Val (16#FF#);
|
|
when Utf8_All =>
|
|
return Character'Val (16#EF#) & Character'Val (16#BB#)
|
|
& Character'Val (16#BF#);
|
|
when Ucs4_BE =>
|
|
return Character'Val (16#00#) & Character'Val (16#00#)
|
|
& Character'Val (16#00#) & Character'Val (16#3C#);
|
|
when Ucs4_LE =>
|
|
return Character'Val (16#3C#) & Character'Val (16#00#)
|
|
& Character'Val (16#00#) & Character'Val (16#00#);
|
|
when Ucs4_2143 =>
|
|
return Character'Val (16#00#) & Character'Val (16#00#)
|
|
& Character'Val (16#3C#) & Character'Val (16#00#);
|
|
when Ucs4_3412 =>
|
|
return Character'Val (16#00#) & Character'Val (16#3C#)
|
|
& Character'Val (16#00#) & Character'Val (16#00#);
|
|
when Unknown =>
|
|
return "";
|
|
end case;
|
|
end Write_Bom;
|
|
|
|
-----------------------
|
|
-- Index_From_Offset --
|
|
-----------------------
|
|
|
|
function Index_From_Offset
|
|
(Str : Byte_Sequence; Offset : Natural; Encoding : Encoding_Scheme)
|
|
return Integer
|
|
is
|
|
Pos : Natural := Str'First;
|
|
Offs : Integer := Offset;
|
|
C : Unicode_Char;
|
|
begin
|
|
while Pos <= Str'Last loop
|
|
if Offs <= 0 then
|
|
return Pos;
|
|
end if;
|
|
Encoding.Read (Str, Pos, C);
|
|
Offs := Offs - 1;
|
|
end loop;
|
|
return -1;
|
|
end Index_From_Offset;
|
|
|
|
end Unicode.CES;
|