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/*
* 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)
* Copyright (c) 2010, 2011 Giuseppe Scrivano (gscrivano@gnu.org)
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "barcode.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.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 KLMNOWABCDEFGHIJKLMNOPQRSTUVWXYZPQRST";
#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(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 char *text;
static char *partial; /* dynamic */
static char *textinfo; /* dynamic */
char *c, *textptr;
int *checksum_str;
int i, j, k, 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;
}
/* length of partial:
6 * (head + 2*text + 2*check + tail) + lastbar + margin + terminator */
partial = malloc( (strlen(text) *2 + 4) * 6 + 3);
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[(int)(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[(int)(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;
}
textptr[-1] = '\0'; /* overwrite last space */
c_checksum=0;
k_checksum=0;
/* Add the checksum */
if ( (bc->flags & BARCODE_NO_CHECKSUM)==0 )
{
/* thanks to Ian Ward for fixing checksums */
for(i=1, j=1, k=2; i<=checksum_len; i++, j++, k++)
{
if(j>20) j=1; /* c_check weight wraps at 20 */
if(k>15) k=1; /* k_check weight wraps at 15 */
c_checksum += j * (int)checksum_str[checksum_len - i];
k_checksum += k * (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;
free(checksum_str);
return 0;
}
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