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-----------------------------------------------------------------------
-- XML/Ada - An XML suite for Ada95 --
-- --
-- Copyright (C) 2001-2002 --
-- ACT-Europe --
-- --
-- This library is free software; you can redistribute it and/or --
-- modify it under the terms of the GNU General Public --
-- License as published by the Free Software Foundation; either --
-- version 2 of the License, 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 --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU --
-- General Public License for more details. --
-- --
-- You should have received a copy of the GNU General Public --
-- License along with this library; if not, write to the --
-- Free Software Foundation, Inc., 59 Temple Place - Suite 330, --
-- Boston, MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from --
-- this unit, or you link this unit with other files to produce an --
-- executable, this unit does not by itself cause the resulting --
-- executable to be covered by the GNU General Public License. This --
-- exception does not however invalidate any other reasons why the --
-- executable file might be covered by the GNU Public License. --
-----------------------------------------------------------------------
with Ada.Direct_IO;
with Unicode.CES; use Unicode.CES;
with Unicode.CES.Utf32; use Unicode.CES.Utf32;
with Unicode.CES.Utf16; use Unicode.CES.Utf16;
with Unicode.CES.Utf8; use Unicode.CES.Utf8;
package body Input_Sources.File is
procedure Fast_Read (The_File : in String; Buf : in Byte_Sequence_Access);
-- Read Buf'length characters in The_File and store it in Buf.
-- This procedure performs a single call to Read.
---------------
-- Fast_Read --
---------------
procedure Fast_Read (The_File : in String;
Buf : in Byte_Sequence_Access) is
type Fixed_String is new String (Buf'Range);
package Dir_Fast is new Ada.Direct_IO (Fixed_String);
use Dir_Fast;
F : Dir_Fast.File_Type;
begin
Dir_Fast.Open (F, In_File, The_File);
Dir_Fast.Read (F, Fixed_String (Buf.all));
Dir_Fast.Close (F);
end Fast_Read;
----------
-- Open --
----------
procedure Open (Filename : String; Input : out File_Input) is
package Dir is new Ada.Direct_IO (Character);
F : Dir.File_Type;
Length : Natural;
BOM : Bom_Type;
begin
Dir.Open (F, Dir.In_File, Filename);
Length := Natural (Dir.Size (F));
Dir.Close (F);
-- If the file is empty, we just create a reader that will not return
-- any character. This will fail later on when the XML document is
-- parsed, anyway.
if Length = 0 then
Input.Buffer := new String (1 .. 1);
Input.Index := 2;
return;
end if;
Input.Buffer := new String (1 .. Length);
Fast_Read (Filename, Input.Buffer);
Read_Bom (Input.Buffer.all, Input.Prolog_Size, BOM);
case BOM is
when Utf32_LE =>
Set_Encoding (Input, Utf32_LE_Encoding);
when Utf32_BE =>
Set_Encoding (Input, Utf32_BE_Encoding);
when Utf16_LE =>
Set_Encoding (Input, Utf16_LE_Encoding);
when Utf16_BE =>
Set_Encoding (Input, Utf16_BE_Encoding);
when Ucs4_BE | Ucs4_LE | Ucs4_2143 | Ucs4_3412 =>
raise Invalid_Encoding;
when Utf8_All | Unknown =>
Set_Encoding (Input, Utf8_Encoding);
end case;
Input.Index := Input.Buffer'First + Input.Prolog_Size;
end Open;
-----------
-- Close --
-----------
procedure Close (Input : in out File_Input) is
begin
Input_Sources.Close (Input_Source (Input));
Free (Input.Buffer);
Input.Index := Natural'Last;
end Close;
---------------
-- Next_Char --
---------------
procedure Next_Char
(From : in out File_Input;
C : out Unicode.Unicode_Char) is
begin
From.Es.Read (From.Buffer.all, From.Index, C);
C := From.Cs.To_Unicode (C);
end Next_Char;
---------
-- Eof --
---------
function Eof (From : File_Input) return Boolean is
begin
return From.Index > From.Buffer'Length;
end Eof;
end Input_Sources.File;
|
