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
|
/*
* code39.c -- encoding for code39
*
* Copyright (c) 1999 Alessandro Rubini (rubini@gnu.org)
* Copyright (c) 1999 Prosa Srl. (prosa@prosa.it)
* Copyright (c) 2001 Nathan D. Holmes / FedEx Services (ndholmes@fedex.com)
*
* This program 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 program 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 program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include "barcode.h"
/* this is ordered in decades to simplify encoding */
static char alphabet[] =
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%";
static char *codeset[] = {
"131112", "111213", "111312", "111411", "121113", /* 0 - 4 */
"121212", "121311", "111114", "131211", "141111", /* 5 - 9 */
"211113", "211212", "211311", "221112", "221211", /* A - E */
"231111", "112113", "112212", "112311", "122112", /* F - J */
"132111", "111123", "111222", "111321", "121122", /* K - O */
"131121", "212112", "212211", "211122", "211221", /* P - T */
"221121", "222111", "112122", "112221", "122121", /* U - Y */
"123111", "121131", "311112", "311211", "321111", /* Z - $ */
"112131", "113121", "211131", "121221", "312111", /* / - (%) */
"311121", "122211", "111141" /* (/) - (terminator) */
};
/* 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001111111111111111111111111111 */
/* 00000000001111111111222222222233333333334444444444555555555566666666667777777777888888888899999999990000000000111111111122222222 */
/* 01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567 */
static char shiftset[] =
"%$$$$$$$$$$$$$$$$$$$$$$$$$$%%%%% /// ///// / /%%%%%% %%%%%%++++++++++++++++++++++++++%%%%%";
static char shiftset2[] =
"UABCDEFGHIJKLMNOPQRSTUVWXYZABCDE ABC FGHIJ L ZFGHIJV KLMNOWABCDEFGHIJLKMNOPQRSTUVWXYZPQRST";
#define START_STOP 47
#define EXTEND_DOLLAR 43
#define EXTEND_PERCENT 44
#define EXTEND_SLASH 45
#define EXTEND_PLUS 46
/*
* Check that the text can be encoded. Returns 0 or -1.
* All of ASCII-7 is accepted.
*/
int Barcode_93_verify(unsigned char *text)
{
int i;
if (!strlen(text))
return -1;
for (i=0; text[i]; i++) {
/* Test if beyond the range of 7-bit ASCII */
if ((int)text[i] > 127)
return -1;
}
return 0;
}
/*
* The encoding functions fills the "partial" and "textinfo" fields.
* Lowercase chars are converted to uppercase
*/
int Barcode_93_encode(struct Barcode_Item *bc)
{
static unsigned char *text;
static char *partial; /* dynamic */
static char *textinfo; /* dynamic */
char *c, *textptr;
int *checksum_str;
int i, code, textpos, checksum_len=0;
int c_checksum = 0;
int k_checksum = 0;
if (bc->partial)
free(bc->partial);
if (bc->textinfo)
free(bc->textinfo);
bc->partial = bc->textinfo = NULL; /* safe */
if (!bc->encoding)
bc->encoding = strdup("code 93");
text = bc->ascii;
if (!text) {
bc->error = EINVAL;
return -1;
}
/* the partial code is 6 * (head + 2* text + 2* check + tail) + margin + term. */
partial = malloc( (strlen(text) *2 + 4) * 6 +2);
if (!partial) {
bc->error = errno;
return -1;
}
checksum_str = (int *)malloc( (strlen(text) + 3) * 2 * sizeof(int));
if (!checksum_str) {
free(partial);
bc->error = errno;
return -1;
}
/* the text information is at most "nnn:fff:c " * strlen +term */
textinfo = malloc(10*strlen(text) + 2);
if (!textinfo) {
bc->error = errno;
free(partial);
free(checksum_str);
return -1;
}
textptr = textinfo;
textpos = 22;
strcpy(partial, "0");
strcat(partial, codeset[START_STOP]);
for (i=0; i<strlen(text); i++) {
c = strchr(alphabet, text[i]);
if (!c) {
/* Encode the shift character */
switch(shiftset[text[i]])
{
case '$':
code = EXTEND_DOLLAR;
break;
case '%':
code = EXTEND_PERCENT;
break;
case '/':
code = EXTEND_SLASH;
break;
case '+':
code = EXTEND_PLUS;
break;
default:
code = 0;
break;
}
strcat(partial, codeset[code]);
checksum_str[checksum_len++] = code;
/* Encode the second character */
code = strchr(alphabet, shiftset2[text[i]]) - alphabet;
strcat(partial, codeset[code]);
checksum_str[checksum_len++] = code;
} else {
/* Character is natively supported by the symbology, encode directly */
code = c - alphabet;
strcat(partial, codeset[c -alphabet]);
checksum_str[checksum_len++] = code;
}
sprintf(textptr, "%i:12:%c ", textpos, text[i]);
textptr += strlen(textptr);
/*
* width of each code is 9; composed codes are 18, but aligning
* the text behind the right bars would be ugly, so use 9 anyways
*/
textpos += 9;
}
c_checksum=0;
k_checksum=0;
/* Add the checksum */
if ( (bc->flags & BARCODE_NO_CHECKSUM)==0 )
{
for(i=1; i<=checksum_len; i++)
{
c_checksum += i * (int)checksum_str[checksum_len - i];
k_checksum += (i+1) * (int)checksum_str[checksum_len - i];
}
c_checksum = c_checksum % 47;
k_checksum += c_checksum;
k_checksum = k_checksum % 47;
strcat(partial, codeset[c_checksum]);
strcat(partial, codeset[k_checksum]);
}
strcat(partial, codeset[START_STOP]); /* end */
/* Encodes final 1-unit width bar to turn the start character into a stop char */
strcat(partial, "1");
bc->partial = partial;
bc->textinfo = textinfo;
return 0;
}
|
