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