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
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321 | -- A library for drawing bar codes
--
-- Copyright (C) by PragmAda Software Engineering
--
-- Released under the terms of the 3-Clause BSD License. See https://opensource.org/licenses/BSD-3-Clause
-- Parts of this software are modified from Bar_Codes.Encode_Code_128 by Gautier de Montmollin
-- Copyright (c) 2018 Gautier de Montmollin
-- Permission is hereby granted, free of charge, to any person obtaining a copy
-- of this software and associated documentation files (the "Software"), to deal
-- in the Software without restriction, including without limitation the rights
-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-- copies of the Software, and to permit persons to whom the Software is
-- furnished to do so, subject to the following conditions:
-- The above copyright notice and this permission notice shall be included in
-- all copies or substantial portions of the Software.
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-- THE SOFTWARE.
with Ada.Characters.Latin_1;
package body Bar_Code_Drawing.What.Code_128 is
subtype Code_Range is Integer range 0 .. 106;
type Sequence is array (Positive range <>) of Code_Range;
function Compose_Code (Text : in String) return Sequence;
-- Converts Text into a Sequence of codes; each code defines a pattern of lines in the bar code
function Compose_Code (Text : in String) return Sequence is
-- Worst case: we switch subcode for each symbol!
Max_Length : constant Integer := Text'Length * 2 + 2;
Code : Sequence (1 .. Max_Length);
Code_Length : Natural := 0;
type Code_128_Subcode is (Undefined, A, B, C);
Subcode : Code_128_Subcode := Undefined;
Checksum : Natural := 0;
procedure Add_Symbol (Symbol : in Code_Range);
-- Adds Symbol to Code
procedure Add_Symbol (Symbol : in Code_Range) is
-- Empty
begin -- Add_Symbol
Checksum := Checksum + Symbol * Integer'Max (1, Code_Length);
Code_Length := Code_Length + 1;
Code (Code_Length) := Symbol;
end Add_Symbol;
subtype Defined_Subcode is Code_128_Subcode range A .. C;
First_Digit : Boolean; -- First digit in a pair of digits for subcode C
procedure Switch_To (New_Subcode : in Defined_Subcode);
-- Adds a symbol to Code to switch subcodes
procedure Switch_To (New_Subcode : in Defined_Subcode) is
-- Empty
begin
if Subcode = Undefined then
-- Start code A/B/C:
case New_Subcode is
when A => Add_Symbol (103);
when B => Add_Symbol (104);
when C => Add_Symbol (105);
end case;
else
case New_Subcode is
when A => Add_Symbol (101);
when B => Add_Symbol (100);
when C => Add_Symbol (099);
end case;
end if;
if New_Subcode = C then
First_Digit := True;
end if;
Subcode := New_Subcode;
end Switch_To;
Four_Digits : Boolean;
Digit_Buffer : Natural;
Digit : Natural;
begin -- Compose_Code
for I in Text'Range loop
-- Choice of a subcode
case Text (I) is
when Ada.Characters.Latin_1.NUL .. Ada.Characters.Latin_1.US =>
if Subcode /= A then
Switch_To (A);
end if;
when Character'Val (96) .. Ada.Characters.Latin_1.DEL =>
if Subcode /= B then
Switch_To (B);
end if;
when '0' .. '9' =>
if Subcode = C then
-- If text (i) is meant to be the first digit of a pair,
-- ensure there is a second digit after.
if First_Digit then
if I = Text'Last or else Text (I + 1) not in '0' .. '9' then
Switch_To (B); -- We need to encode this digit with subcode A or B
end if;
end if;
else
if I + 3 <= Text'Last then
Four_Digits := (for all C of Text (I .. I + 3) => C in '0' .. '9');
if Four_Digits then
Switch_To (C);
end if;
end if;
if Subcode = Undefined then
Switch_To (B);
end if;
end if;
when others =>
-- A or B is good.
if Subcode not in A .. B then
Switch_To (B); -- Just an assumption: characters like 'a' .. 'z' more likely.
end if;
end case;
-- Encode Text (I)
case Subcode is
when Undefined =>
null;
when A =>
if Text (I) <= Ada.Characters.Latin_1.US then
Add_Symbol (Character'Pos (Text (I) ) + 64);
else
Add_Symbol (Character'Pos (Text (I) ) - 32);
end if;
when B =>
Add_Symbol (Character'Pos (Text (I) ) - 32);
when C =>
Digit := Character'Pos (Text (I) ) - Character'Pos ('0');
if First_Digit then
Digit_Buffer := Digit;
else
Add_Symbol (10 * Digit_Buffer + Digit);
end if;
First_Digit := not First_Digit;
end case;
end loop;
-- Checksum symbol
Add_Symbol (Checksum mod 103);
-- Stop symbol
Add_Symbol (106);
return Code (1 .. Code_Length);
end Compose_Code;
Symbol_Width : constant := 11; -- Each symbol has 3 bars and takes 11 "modules" in total.
Stop_Extra_Width : constant := 2; -- Supplemental bar after stop symbol.
function Width (Text : in String) return Natural is
(Compose_Code (Text)'Length * Symbol_Width + Stop_Extra_Width);
procedure Draw (Info : in out Drawing_Info; Text : in String) is
Code : constant Sequence := Compose_Code (Text);
type Width_Sequence is array (1 .. 5) of Positive;
Width : constant array (Code_Range) of Width_Sequence :=
-- These are the widths for: bar, space, bar, space, bar (last space width is implicit).
( 0 => (2, 1, 2, 2, 2),
1 => (2, 2, 2, 1, 2),
2 => (2, 2, 2, 2, 2),
3 => (1, 2, 1, 2, 2),
4 => (1, 2, 1, 3, 2),
5 => (1, 3, 1, 2, 2),
6 => (1, 2, 2, 2, 1),
7 => (1, 2, 2, 3, 1),
8 => (1, 3, 2, 2, 1),
9 => (2, 2, 1, 2, 1),
10 => (2, 2, 1, 3, 1),
11 => (2, 3, 1, 2, 1),
12 => (1, 1, 2, 2, 3),
13 => (1, 2, 2, 1, 3),
14 => (1, 2, 2, 2, 3),
15 => (1, 1, 3, 2, 2),
16 => (1, 2, 3, 1, 2),
17 => (1, 2, 3, 2, 2),
18 => (2, 2, 3, 2, 1),
19 => (2, 2, 1, 1, 3),
20 => (2, 2, 1, 2, 3),
21 => (2, 1, 3, 2, 1),
22 => (2, 2, 3, 1, 1),
23 => (3, 1, 2, 1, 3),
24 => (3, 1, 1, 2, 2),
25 => (3, 2, 1, 1, 2),
26 => (3, 2, 1, 2, 2),
27 => (3, 1, 2, 2, 1),
28 => (3, 2, 2, 1, 1),
29 => (3, 2, 2, 2, 1),
30 => (2, 1, 2, 1, 2),
31 => (2, 1, 2, 3, 2),
32 => (2, 3, 2, 1, 2),
33 => (1, 1, 1, 3, 2),
34 => (1, 3, 1, 1, 2),
35 => (1, 3, 1, 3, 2),
36 => (1, 1, 2, 3, 1),
37 => (1, 3, 2, 1, 1),
38 => (1, 3, 2, 3, 1),
39 => (2, 1, 1, 3, 1),
40 => (2, 3, 1, 1, 1),
41 => (2, 3, 1, 3, 1),
42 => (1, 1, 2, 1, 3),
43 => (1, 1, 2, 3, 3),
44 => (1, 3, 2, 1, 3),
45 => (1, 1, 3, 1, 2),
46 => (1, 1, 3, 3, 2),
47 => (1, 3, 3, 1, 2),
48 => (3, 1, 3, 1, 2),
49 => (2, 1, 1, 3, 3),
50 => (2, 3, 1, 1, 3),
51 => (2, 1, 3, 1, 1),
52 => (2, 1, 3, 3, 1),
53 => (2, 1, 3, 1, 3),
54 => (3, 1, 1, 1, 2),
55 => (3, 1, 1, 3, 2),
56 => (3, 3, 1, 1, 2),
57 => (3, 1, 2, 1, 1),
58 => (3, 1, 2, 3, 1),
59 => (3, 3, 2, 1, 1),
60 => (3, 1, 4, 1, 1),
61 => (2, 2, 1, 4, 1),
62 => (4, 3, 1, 1, 1),
63 => (1, 1, 1, 2, 2),
64 => (1, 1, 1, 4, 2),
65 => (1, 2, 1, 1, 2),
66 => (1, 2, 1, 4, 2),
67 => (1, 4, 1, 1, 2),
68 => (1, 4, 1, 2, 2),
69 => (1, 1, 2, 2, 1),
70 => (1, 1, 2, 4, 1),
71 => (1, 2, 2, 1, 1),
72 => (1, 2, 2, 4, 1),
73 => (1, 4, 2, 1, 1),
74 => (1, 4, 2, 2, 1),
75 => (2, 4, 1, 2, 1),
76 => (2, 2, 1, 1, 1),
77 => (4, 1, 3, 1, 1),
78 => (2, 4, 1, 1, 1),
79 => (1, 3, 4, 1, 1),
80 => (1, 1, 1, 2, 4),
81 => (1, 2, 1, 1, 4),
82 => (1, 2, 1, 2, 4),
83 => (1, 1, 4, 2, 1),
84 => (1, 2, 4, 1, 1),
85 => (1, 2, 4, 2, 1),
86 => (4, 1, 1, 2, 1),
87 => (4, 2, 1, 1, 1),
88 => (4, 2, 1, 2, 1),
89 => (2, 1, 2, 1, 4),
90 => (2, 1, 4, 1, 2),
91 => (4, 1, 2, 1, 2),
92 => (1, 1, 1, 1, 4),
93 => (1, 1, 1, 3, 4),
94 => (1, 3, 1, 1, 4),
95 => (1, 1, 4, 1, 1),
96 => (1, 1, 4, 3, 1),
97 => (4, 1, 1, 1, 1),
98 => (4, 1, 1, 3, 1),
99 => (1, 1, 3, 1, 4),
100 => (1, 1, 4, 1, 3),
101 => (3, 1, 1, 1, 4),
102 => (4, 1, 1, 1, 3),
103 => (2, 1, 1, 4, 1),
104 => (2, 1, 1, 2, 1),
105 => (2, 1, 1, 2, 3),
106 => (2, 3, 3, 1, 1) );
X : Natural;
procedure Bar (Offset : in Natural; Width : in Natural);
-- Draw a bar of width Width at X + Offset
procedure Bar (Offset : in Natural; Width : in Natural) is
-- Empty
begin
All_Bars : for I in 0 .. Width - 1 loop
Draw_Module (Info => Info, X => X + Offset + I, Y => 0);
end loop All_Bars;
end Bar;
begin -- Draw
for I in Code'Range loop
X := (I - 1) * Symbol_Width;
declare
Ws : constant Width_Sequence := Width (Code (I) );
begin
Bar (Offset => 0, Width => Ws (1) );
Bar (Offset => Ws (1) + Ws (2), Width => Ws (3) );
Bar (Offset => Ws (1) + Ws (2) + Ws (3) + Ws (4), Width => Ws (5) );
end;
end loop;
-- Extra bar after the Stop symbol; this gives the Reverse Stop symbol
-- when the bar code is scanned turned 180°.
X := Code'Length * Symbol_Width;
Bar (Offset => 0, Width => 2);
end Draw;
end Bar_Code_Drawing.What.Code_128;
|