1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
-----------------------------------------------------------------------
-- 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. --
-----------------------------------------------------------------------
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_BE;
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;
-----------------------
-- 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;
|
