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138 lines
4.7 KiB
Ada
138 lines
4.7 KiB
Ada
------------------------------------------------------------------------------
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-- XML/Ada - An XML suite for Ada95 --
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-- --
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-- Copyright (C) 2001-2017, AdaCore --
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-- --
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-- This library is free software; you can redistribute it and/or modify it --
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-- under terms of the GNU General Public License as published by the Free --
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-- Software Foundation; either version 3, or (at your option) any later --
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-- version. This library is distributed in the hope that it will be useful, --
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN- --
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-- TABILITY 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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------------------------------------------------------------------------------
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with Unicode; use Unicode;
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with Unicode.CES; use Unicode.CES;
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with Unicode.CES.Utf32; use Unicode.CES.Utf32;
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with Unicode.CES.Utf16; use Unicode.CES.Utf16;
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with Unicode.CES.Utf8; use Unicode.CES.Utf8;
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package body Input_Sources.Strings is
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----------
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-- Open --
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----------
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procedure Open
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(Str : Unicode.CES.Cst_Byte_Sequence_Access;
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Encoding : Unicode.CES.Encoding_Scheme;
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Input : out String_Input)
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is
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BOM : Bom_Type;
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begin
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Input.Encoding := Encoding;
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Input.Buffer := Str;
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Input.Buffer2 := null;
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Read_Bom (Input.Buffer.all, Input.Prolog_Size, BOM);
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case BOM is
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when Utf32_LE =>
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Set_Encoding (Input, Utf32_LE_Encoding);
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when Utf32_BE =>
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Set_Encoding (Input, Utf32_BE_Encoding);
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when Utf16_LE =>
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Set_Encoding (Input, Utf16_LE_Encoding);
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when Utf16_BE =>
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Set_Encoding (Input, Utf16_BE_Encoding);
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when Ucs4_BE | Ucs4_LE | Ucs4_2143 | Ucs4_3412 =>
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raise Invalid_Encoding;
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when Utf8_All | Unknown =>
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Set_Encoding (Input, Utf8_Encoding);
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end case;
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Input.Index := Input.Buffer'First + Input.Prolog_Size;
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end Open;
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----------
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-- Open --
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----------
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procedure Open
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(Str : Unicode.CES.Byte_Sequence;
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Encoding : Unicode.CES.Encoding_Scheme;
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Input : out String_Input)
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is
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BOM : Bom_Type;
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begin
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Input.Encoding := Encoding;
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Input.Buffer2 := new Byte_Sequence'(Str);
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Input.Buffer := Cst_Byte_Sequence_Access (Input.Buffer2);
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Read_Bom (Input.Buffer.all, Input.Prolog_Size, BOM);
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case BOM is
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when Utf32_LE =>
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Set_Encoding (Input, Utf32_LE_Encoding);
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when Utf32_BE =>
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Set_Encoding (Input, Utf32_BE_Encoding);
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when Utf16_LE =>
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Set_Encoding (Input, Utf16_LE_Encoding);
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when Utf16_BE =>
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Set_Encoding (Input, Utf16_BE_Encoding);
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when Ucs4_BE | Ucs4_LE | Ucs4_2143 | Ucs4_3412 =>
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raise Invalid_Encoding;
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when Utf8_All | Unknown =>
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Set_Encoding (Input, Utf8_Encoding);
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end case;
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Input.Index := Input.Buffer'First + Input.Prolog_Size;
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end Open;
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-----------
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-- Close --
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-----------
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procedure Close (Input : in out String_Input) is
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begin
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if Input.Buffer2 /= null then
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Free (Input.Buffer2);
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end if;
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Input_Sources.Close (Input_Source (Input));
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end Close;
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---------------
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-- Next_Char --
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---------------
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procedure Next_Char
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(From : in out String_Input;
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C : out Unicode.Unicode_Char) is
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begin
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From.Encoding.Read (From.Buffer.all, From.Index, C);
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exception
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-- For a String input, an incomplete encoding is invalid.
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when Incomplete_Encoding =>
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raise Invalid_Encoding;
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end Next_Char;
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---------
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-- Eof --
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---------
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function Eof (From : String_Input) return Boolean is
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begin
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return From.Index > From.Buffer'Last;
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end Eof;
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end Input_Sources.Strings;
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