zint/backend/code.c

/* code.c - Handles Code 11, 39, 39+ and 93 */

/*
    libzint - the open source barcode library
    Copyright (C) 2008 Robin Stuart <robin@zint.org.uk>

    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, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

/* In version 0.5 this file was 1,553 lines long! */

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "common.h"


#define NASET	"0123456789-"
static char *C11Table[11] = {"111121", "211121", "121121", "221111", "112121", "212111", "122111",
	"111221", "211211", "211111", "112111"};


/* Code 39 tables checked against ISO/IEC 16388:2007 */
	
#define TCSET	"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%abcd"
/* Incorporates Table A1 */

static char *C39Table[43] = { "1112212111", "2112111121", "1122111121", "2122111111", "1112211121",
	"2112211111", "1122211111", "1112112121", "2112112111", "1122112111", "2111121121",
	"1121121121", "2121121111", "1111221121", "2111221111", "1121221111", "1111122121",
	"2111122111", "1121122111", "1111222111", "2111111221", "1121111221", "2121111211",
	"1111211221", "2111211211", "1121211211", "1111112221", "2111112211", "1121112211",
	"1111212211", "2211111121", "1221111121", "2221111111", "1211211121", "2211211111",
	"1221211111", "1211112121", "2211112111", "1221112111", "1212121111", "1212111211",
	"1211121211", "1112121211"};
/* Code 39 character assignments (Table 1) */

static char *EC39Ctrl[128] = {"%U", "$A", "$B", "$C", "$D", "$E", "$F", "$G", "$H", "$I", "$J", "$K",
	"$L", "$M", "$N", "$O", "$P", "$Q", "$R", "$S", "$T", "$U", "$V", "$W", "$X", "$Y", "$Z",
	"%A", "%B", "%C", "%D", "%E", " ", "/A", "/B", "/C", "/D", "/E", "/F", "/G", "/H", "/I", "/J",
	"/K", "/L", "-", ".", "/O", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "/Z", "%F",
	"%G", "%H", "%I", "%J", "%V", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
	"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "%K", "%L", "%M", "%N", "%O",
	"%W", "+A", "+B", "+C", "+D", "+E", "+F", "+G", "+H", "+I", "+J", "+K", "+L", "+M", "+N", "+O",
	"+P", "+Q", "+R", "+S", "+T", "+U", "+V", "+W", "+X", "+Y", "+Z", "%P", "%Q", "%R", "%S", "%T"};
/* Encoding the full ASCII character set in Code 39 (Table A2) */

static char *C93Ctrl[128] = {"bU", "aA", "aB", "aC", "aD", "aE", "aF", "aG", "aH", "aI", "aJ", "aK",
	"aL", "aM", "aN", "aO", "aP", "aQ", "aR", "aS", "aT", "aU", "aV", "aW", "aX", "aY", "aZ",
	"bA", "bB", "bC", "bD", "bE", " ", "cA", "cB", "cC", "cD", "cE", "cF", "cG", "cH", "cI", "cJ",
	"cK", "cL", "cM", "cN", "cO", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "cZ", "bF",
	"bG", "bH", "bI", "bJ", "bV", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
	"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "bK", "bL", "bM", "bN", "bO",
	"bW", "dA", "dB", "dC", "dD", "dE", "dF", "dG", "dH", "dI", "dJ", "dK", "dL", "dM", "dN", "dO",
	"dP", "dQ", "dR", "dS", "dT", "dU", "dV", "dW", "dX", "dY", "dZ", "bP", "bQ", "bR", "bS", "bT"};

static char *C93Table[47] = {"131112", "111213", "111312", "111411", "121113", "121212", "121311",
	"111114", "131211", "141111", "211113", "211212", "211311", "221112", "221211", "231111",
	"112113", "112212", "112311", "122112", "132111", "111123", "111222", "111321", "121122",
	"131121", "212112", "212211", "211122", "211221", "221121", "222111", "112122", "112221",
	"122121", "123111", "121131", "311112", "311211", "321111", "112131", "113121", "211131",
	"121221", "312111", "311121", "122211"};

/* Global Variables for Channel Code */
int S[11], B[11];
long value;
long target_value;
char pattern[30];

/* Function Prototypes */
void NextS(int Chan, int i, int MaxS, int MaxB);
void NextB(int Chan, int i, int MaxB, int MaxS);
	
/* *********************** CODE 11 ******************** */

int code_11(struct zint_symbol *symbol, unsigned char source[])
{ /* Code 11 */

	unsigned int i;
	int h, c_digit, c_weight, c_count, k_digit, k_weight, k_count;
	int weight[1000], error_number;
	char dest[1000];
	char checkstr[3];
	
	error_number = 0;
	strcpy(dest, "");

	if(ustrlen(source) > 80) {
		strcpy(symbol->errtxt, "Input too long");
		return ERROR_TOO_LONG;
	}
	error_number = is_sane(NASET, source);
	if(error_number == ERROR_INVALID_DATA) {
		strcpy(symbol->errtxt, "Invalid characters in data");
		return error_number;
	}
	c_weight = 1;
	c_count = 0;
	k_weight = 1;
	k_count = 0;

	/* start character */
	concat (dest, "112211");

	/* Draw main body of barcode */
	for(i = 0; i < ustrlen(source); i++) {
		lookup(NASET, C11Table, source[i], dest);
		weight[i] = ctoi(source[i]);
	}

	/* Calculate C checksum */
	for(h = (ustrlen(source) - 1); h >= 0; h--) {
		c_count += (c_weight * weight[h]);
		c_weight++;

		if(c_weight > 10) {
			c_weight = 1;
		}
	}
	c_digit = c_count%11;

	weight[ustrlen(source)] = c_digit;

	/* Calculate K checksum */
	for(h = ustrlen(source); h >= 0; h--) {
		k_count += (k_weight * weight[h]);
		k_weight++;

		if(k_weight > 9) {
			k_weight = 1;
		}
	}
	k_digit = k_count%11;

	checkstr[0] = itoc(c_digit);
	checkstr[1] = itoc(k_digit);
	if(checkstr[0] == 'A') { checkstr[0] = '-'; }
	if(checkstr[1] == 'A') { checkstr[1] = '-'; }
	checkstr[2] = '\0';
	lookup(NASET, C11Table, checkstr[0], dest);
	lookup(NASET, C11Table, checkstr[1], dest);
	
	/* Stop character */
	concat (dest, "11221");

	expand(symbol, dest);

	ustrcpy(symbol->text, source);
	uconcat(symbol->text, (unsigned char*)checkstr);
	return error_number;
}

int c39(struct zint_symbol *symbol, unsigned char source[])
{ /* Code 39 */
	unsigned int i;
	unsigned int counter;
	char check_digit;
	int h, error_number;
	char dest[1000];
	char localstr[3];
	
	error_number = 0;
	counter = 0;
	strcpy(dest, "");
	strcpy(localstr, "");

	if((symbol->option_2 < 0) || (symbol->option_2 > 1)) {
		symbol->option_2 = 0;
	}
	
	to_upper(source);
	if(ustrlen(source) > 45) {
		strcpy(symbol->errtxt, "Input too long");
		return ERROR_TOO_LONG;
	}
	error_number = is_sane(TCSET , source);
	if(error_number == ERROR_INVALID_DATA) {
		strcpy(symbol->errtxt, "Invalid characters in data");
		return error_number;
	}

	/* Start character */
	concat(dest, "1211212111");

	for(i = 0; i < ustrlen(source); i++) {
		lookup(TCSET, C39Table, source[i], dest);
		counter += posn(TCSET, source[i]);
	}
	
	if((symbol->symbology == BARCODE_LOGMARS) || (symbol->option_2 == 1)) {
		
		counter = counter % 43;
		if(counter < 10) {
			check_digit = itoc(counter);
		} else {
			if(counter < 36) {
				check_digit = (counter - 10) + 'A';
			} else {
				switch(counter) {
					case 36: check_digit = '-'; break;
					case 37: check_digit = '.'; break;
					case 38: check_digit = ' '; break;
					case 39: check_digit = '$'; break;
					case 40: check_digit = '/'; break;
					case 41: check_digit = '+'; break;
					case 42: check_digit = 37; break;
					default: check_digit = ' '; break; /* Keep compiler happy */
				}
			}
		}
		lookup(TCSET, C39Table, check_digit, dest);
	
		/* Display a space check digit as _, otherwise it looks like an error */
		if(check_digit == ' ') {
			check_digit = '_';
		}
		
		h = ustrlen(source);
		localstr[0] = check_digit;
		localstr[1] = '\0';
	}
	
	/* Stop character */
	concat (dest, "121121211");
	
	if((symbol->symbology == BARCODE_LOGMARS) || (symbol->symbology == BARCODE_HIBC_39)) {
		/* LOGMARS uses wider 'wide' bars than normal Code 39 */
		for(i = 0; i < strlen(dest); i++) {
			if(dest[i] == '2') {
				dest[i] = '3';
			}
		}
	}
	
	expand(symbol, dest);
	
	if(symbol->symbology == BARCODE_CODE39) {
		ustrcpy(symbol->text, (unsigned char*)"*");
		uconcat(symbol->text, source);
		uconcat(symbol->text, (unsigned char*)localstr);
		uconcat(symbol->text, (unsigned char*)"*");
	} else {
		ustrcpy(symbol->text, source);
		uconcat(symbol->text, (unsigned char*)localstr);
	}
	return error_number;
}

int pharmazentral(struct zint_symbol *symbol, unsigned char source[])
{ /* Pharmazentral Nummer (PZN) */
	
	int i, error_number;
	unsigned int h, count, check_digit;
	char localstr[10], checkstr[3];
	int zeroes;
	
	error_number = 0;

	count = 0;
	h = ustrlen(source);
	if(h > 6) {
		strcpy(symbol->errtxt, "Input wrong length");
		return ERROR_TOO_LONG;
	}
	error_number = is_sane(NESET, source);
	if(error_number == ERROR_INVALID_DATA) {
		strcpy(symbol->errtxt, "Invalid characters in data");
		return error_number;
	}
	
	strcpy(localstr, "-");
	zeroes = 6 - h;
	for(i = 0; i < zeroes; i++)
		concat(localstr, "0");
	concat(localstr, (char *)source);
	
	for (i = 1; i < 7; i++)
	{
		count += (i + 1) * ctoi(localstr[i]);
	}
	
	check_digit = count%11;
	if (check_digit == 11) { check_digit = 0; }
	checkstr[0] = itoc(check_digit);
	checkstr[1] = '\0';
	if(checkstr[0] == 'A') { 
		strcpy(symbol->errtxt, "Invalid PZN Data");
		return ERROR_INVALID_DATA;
	}
	concat(localstr, checkstr);
	error_number = c39(symbol, (unsigned char *)localstr);
	ustrcpy(symbol->text, (unsigned char *)"PZN");
	uconcat(symbol->text, (unsigned char *)localstr);
	return error_number;
}


/* ************** EXTENDED CODE 39 *************** */

int ec39(struct zint_symbol *symbol, unsigned char source[])
{ /* Extended Code 39 - ISO/IEC 16388:2007 Annex A */

	unsigned char buffer[100];
	unsigned int i;
	int ascii_value;
	int error_number;

	memset(buffer,0,100);
	error_number = 0;

	if(ustrlen(source) > 45) {
		/* only stops strings which are far too long - actual length of the barcode
		depends on the type of data being encoded - if it's too long it's picked up
		by c39() */
		strcpy(symbol->errtxt, "Input too long");
		return ERROR_TOO_LONG;
	}
	
	
	for(i = 0; i < ustrlen(source); i++) {
		if(source[i] > 127) {
			/* Cannot encode extended ASCII */
			strcpy(symbol->errtxt, "Invalid characters in input data");
			return ERROR_INVALID_DATA;
		}
	}
	
	/* Creates a buffer string and places control characters into it */
	for(i = 0; i < ustrlen(source); i++) {
		ascii_value = source[i];
		if(ascii_value == symbol->nullchar) {
			concat((char*)buffer, EC39Ctrl[0]);
		} else {
			concat((char*)buffer, EC39Ctrl[ascii_value]);
		}
	}

	/* Then sends the buffer to the C39 function */
	error_number = c39(symbol, buffer);
	
	ustrcpy(symbol->text, source);
	for(i = 0; i < ustrlen(symbol->text); i++) {
		if(symbol->text[i] == symbol->nullchar) {
			symbol->text[i] = ' ';
		}
	}
	return error_number;
}

/* ******************** CODE 93 ******************* */

int c93(struct zint_symbol *symbol, unsigned char source[])
{ /* Code 93 is an advancement on Code 39 and the definition is a lot tighter */

  /* TCSET includes the extra characters a, b, c and d to represent Code 93 specific
     shift characters 1, 2, 3 and 4 respectively. These characters are never used by
     c39() and ec39() */

	unsigned int i;
	int h, weight, c, k, values[100], error_number;
	char buffer[100], temp[2];
	char set_copy[] = TCSET;
	strcpy(buffer, "");
	int ascii_value;
	char dest[1000];
	unsigned char local_source[47];
	
	error_number = 0;
	strcpy(dest, "");

	if(ustrlen(local_source) > 45) {
		/* This stops rediculously long input - the actual length of the barcode
		depends on the type of data */
		strcpy(symbol->errtxt, "Input too long");
		return ERROR_TOO_LONG;
	}
	
	for(i = 0; i < ustrlen(local_source); i++) {
		if(local_source[i] > 127) {
			/* Cannot encode extended ASCII */
			strcpy(symbol->errtxt, "Invalid characters in input data");
			return ERROR_INVALID_DATA;
		}
	}
	
	/* Start character */
	concat(dest, "111141");

	/* Message Content */
	for(i = 0; i < ustrlen(local_source); i++) {
		ascii_value = local_source[i];
		if(ascii_value == symbol->nullchar) {
			concat(buffer, C93Ctrl[0]);
		} else {
			concat(buffer, C93Ctrl[ascii_value]);
		}
	}

	/* Now we can check the true length of the barcode */
	if(strlen(buffer) > 45) {
		strcpy(symbol->errtxt, "Input too long");
		return ERROR_TOO_LONG;
	}
	
	for(i = 0; i < strlen(buffer); i++) {
		values[i] = posn(TCSET, buffer[i]);
	}

	/* Putting the data into dest[] is not done until after check digits are calculated */

	/* Check digit C */

	c = 0;
	weight = 1;
	for(h = strlen(buffer) - 1; h >= 0; h--)
	{
		c += values[h] * weight;
		weight ++;
		if(weight == 21)
		{
			weight = 1;
		}
	}
	c = c % 47;

	/* Because concat() requires a string as its second argument the check digit is converted
	   to a character which is then put in temp[] before being added to buffer[] - its
	   a bit long winded but avoids putting yet another function into common.c */

	values[strlen(buffer)] = c;
	temp[0] = set_copy[c];
	temp[1] = '\0';
	concat(buffer, temp);

	/* Check digit K */
	k = 0;
	weight = 1;
	for(h = strlen(buffer) - 1; h >= 0; h--)
	{
		k += values[h] * weight;
		weight ++;
		if(weight == 16)
		{
			weight = 1;
		}
	}
	k = k % 47;
	temp[0] = set_copy[k];
	temp[1] = '\0';
	concat(buffer, temp);

	for(i = 0; i < strlen(buffer); i++) {
		lookup(TCSET, C93Table, buffer[i], dest);
	}

	/* Stop character */
	concat(dest, "1111411");
	
	h = ustrlen(local_source);
	local_source[h] = set_copy[c];
	local_source[h + 1] = set_copy[k];
	local_source[h + 2] = '\0';
	expand(symbol, dest);
	ustrcpy(symbol->text, local_source);
	for(i = 0; i < ustrlen(symbol->text); i++) {
		if(symbol->text[i] == symbol->nullchar) {
			symbol->text[i] = ' ';
		}
	}
	return error_number;
}

/* NextS() and NextB() are from ANSI/AIM BC12-1998 and are Copyright (c) AIM 1997 */
/* Their are used here on the understanding that they form part of the specification
   for Channel Code and therefore their use is permitted under the following terms
   set out in that document:
   
   "It is the intent and understanding of AIM [t]hat the symbology presented in this
   specification is entirely in the public domain and free of all use restrictions,
   licenses and fees. AIM USA, its memer companies, or individual officers
   assume no liability for the use of this document." */

void CheckCharacter() {
	int i;
	char part[3];
	
	if(value == target_value) {
		/* Target reached - save the generated pattern */
		strcpy(pattern, "11110");
		for(i = 0; i < 11; i++) {
			part[0] = itoc(S[i]);
			part[1] = itoc(B[i]);
			part[2] = '\0';
			concat(pattern, part);
		}
	}
}

void NextB(int Chan, int i, int MaxB, int MaxS) {
	int b;
	
	b = (S[i]+B[i-1]+S[i-1]+B[i-2] > 4)? 1:2;
	if (i < Chan+2) {
		for (; b <= MaxB; b++) {
			B[i] = b;
			NextS(Chan,i+1,MaxS,MaxB+1-b);
		}
	} else if (b <= MaxB) {
		B[i] = MaxB;
		CheckCharacter();
		value++;
	}
}

void NextS(int Chan, int i, int MaxS, int MaxB) {
	int s;
	
	for (s = (i<Chan+2)? 1: MaxS; s <= MaxS; s++) {
		S[i] = s;
		NextB(Chan,i,MaxB,MaxS+1-s);
	}
}

int channel_code(struct zint_symbol *symbol, unsigned char source[]) {
	/* Channel Code - According to ANSI/AIM BC12-1998 */
	
	int input_length, channels, i;
	int error_number = 0, range = 0, zeroes;
	char hrt[9];

	input_length = ustrlen(source);
	target_value = 0;
	
	if(input_length > 7) {
		strcpy(symbol->errtxt, "Input too long");
		return ERROR_TOO_LONG;
	}
	error_number = is_sane(NESET, source);
	if(error_number == ERROR_INVALID_DATA) {
		strcpy(symbol->errtxt, "Invalid characters in data");
		return error_number;
	}
	
	if((symbol->option_2 < 3) || (symbol->option_2 > 8)) { channels = 0; } else { channels = symbol->option_2; }
	if(channels == 0) { channels = input_length + 1; }
	if(channels == 2) { channels = 3; }
	
	for(i = 0; i < input_length; i++) {
		target_value *= 10;
		target_value += ctoi((char) source[i]);
	}
	
	switch(channels) {
		case 3: if(target_value > 26) { range = 1; } break;
		case 4: if(target_value > 292) { range = 1; } break;
		case 5: if(target_value > 3493) { range = 1; } break;
		case 6: if(target_value > 44072) { range = 1; } break;
		case 7: if(target_value > 576688) { range = 1; } break;
		case 8: if(target_value > 7742862) { range = 1; } break;
	}
	if(range) {
		strcpy(symbol->errtxt, "Value out of range");
		return ERROR_INVALID_DATA;
	}
	
	for(i = 0; i < 11; i++) { B[i] = 0; S[i] = 0; }
	
	B[0] = S[1] = B[1] = S[2] = B[2] = 1;
	value = 0;
	NextS(channels,3,channels,channels);
	
	strcpy(hrt, "");
	zeroes = channels - 1 - input_length;
	for(i = 0; i < zeroes; i++) {
		concat(hrt, "0");
	}
	concat(hrt, (char *)source);
	ustrcpy(symbol->text, (unsigned char *)hrt);
	
	expand(symbol, pattern);
	
	return error_number;
}