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>
*/

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

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

#define SODIUM	"0123456789-"
#define SILVER	"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%abcd"

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


/* Code 39 tables checked against ISO/IEC 16388:2007 */

/* Incorporates Table A1 */

static const 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 const 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 const 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 const 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[], int length)
{ /* Code 11 */

	unsigned int i;
	int h, c_digit, c_weight, c_count, k_digit, k_weight, k_count;
	int weight[128], error_number;
	char dest[1024]; /* 6 +  121 * 6 + 2 * 6 + 5 + 1 ~ 1024*/
	char checkstr[3];

	error_number = 0;

	if(length > 121) {
		strcpy(symbol->errtxt, "Input too long");
		return ERROR_TOO_LONG;
	}
	error_number = is_sane(SODIUM, source, length);
	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 */
	strcpy(dest, "112211");

	/* Draw main body of barcode */
	for(i = 0; i < length; i++) {
		lookup(SODIUM, C11Table, source[i], dest);
		if(source[i] == '-')
			weight[i] = 10;
		else
			weight[i] = ctoi(source[i]);
	}

	/* Calculate C checksum */
	for(h = length - 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[length] = c_digit;

	/* Calculate K checksum */
	for(h = length; 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(SODIUM, C11Table, checkstr[0], dest);
	lookup(SODIUM, 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[], int length)
{ /* Code 39 */
	unsigned int i;
	unsigned int counter;
	char check_digit;
	int error_number;
	char dest[775];
	char localstr[2] = { 0 };

	error_number = 0;
	counter = 0;

	if((symbol->option_2 < 0) || (symbol->option_2 > 1)) {
		symbol->option_2 = 0;
	}

	if((symbol->symbology == BARCODE_LOGMARS) && (length > 59)) {
			strcpy(symbol->errtxt, "Input too long");
			return ERROR_TOO_LONG;
	} else if(length > 74) {
			strcpy(symbol->errtxt, "Input too long");
			return ERROR_TOO_LONG;
	}
	to_upper(source);
	error_number = is_sane(SILVER , source, length);
	if(error_number == ERROR_INVALID_DATA) {
		strcpy(symbol->errtxt, "Invalid characters in data");
		return error_number;
	}

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

	for(i = 0; i < length; i++) {
		lookup(SILVER, C39Table, source[i], dest);
		counter += posn(SILVER, 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(SILVER, C39Table, check_digit, dest);

		/* Display a space check digit as _, otherwise it looks like an error */
		if(check_digit == ' ') {
			check_digit = '_';
		}

		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 */
		counter = strlen(dest);
		for(i = 0; i < counter; 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[], int length)
{ /* Pharmazentral Nummer (PZN) */

	int i, error_number, zeroes;
	unsigned int count, check_digit;
	char localstr[10];

	error_number = 0;

	count = 0;
	if(length > 6) {
		strcpy(symbol->errtxt, "Input wrong length");
		return ERROR_TOO_LONG;
	}
	error_number = is_sane(NEON, source, length);
	if(error_number == ERROR_INVALID_DATA) {
		strcpy(symbol->errtxt, "Invalid characters in data");
		return error_number;
	}

	localstr[0] = '-';
	zeroes = 6 - length + 1;
	for(i = 1; i < zeroes; i++)
		localstr[i] = '0';
	strcpy(localstr + zeroes, (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; }
	localstr[7] = itoc(check_digit);
	localstr[8] = '\0';
	if(localstr[7] == 'A') { 
		strcpy(symbol->errtxt, "Invalid PZN Data");
		return ERROR_INVALID_DATA;
	}
	error_number = c39(symbol, (unsigned char *)localstr, strlen(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[], int length)
{ /* Extended Code 39 - ISO/IEC 16388:2007 Annex A */

	unsigned char buffer[150] = { 0 };
	unsigned int i;
	int error_number;

	error_number = 0;

	if(length > 74) {
		strcpy(symbol->errtxt, "Input too long");
		return ERROR_TOO_LONG;
	}

	/* Creates a buffer string and places control characters into it */
	for(i = 0; i < length; i++) {
		if(source[i] > 127) {
			/* Cannot encode extended ASCII */
			strcpy(symbol->errtxt, "Invalid characters in input data");
			return ERROR_INVALID_DATA;
		}
		concat((char*)buffer, EC39Ctrl[source[i]]);		
	}

	/* Then sends the buffer to the C39 function */
	error_number = c39(symbol, buffer, ustrlen(buffer));

	for(i = 0; i < length; i++)
		symbol->text[i] = source[i] ? source[i] : ' ';
	symbol->text[length] = '\0';

	return error_number;
}

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

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

  /* SILVER 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() */

	int i;
	int h, weight, c, k, values[128], error_number;
	char buffer[220];
	char dest[670];
	char set_copy[] = SILVER;

	error_number = 0;
    strcpy(buffer, "");

	if(length > 107) {
		strcpy(symbol->errtxt, "Input too long");
		return ERROR_TOO_LONG;
	}

	/* Message Content */
	for (i = 0; i < length; i++) {
		if (source[i] > 127) {
			/* Cannot encode extended ASCII */
			strcpy(symbol->errtxt, "Invalid characters in input data");
			return ERROR_INVALID_DATA;
		}
		concat(buffer, C93Ctrl[source[i]]);
		symbol->text[i] = source[i] ? source[i] : ' ';
	}

	/* Now we can check the true length of the barcode */
	h = strlen(buffer);
	if (h > 107) {
		strcpy(symbol->errtxt, "Input too long");
		return ERROR_TOO_LONG;
	}

	for (i = 0; i < h; i++) {
		values[i] = posn(SILVER, buffer[i]);
	}

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

	/* Check digit C */
	c = 0;
	weight = 1;
	for (i = h - 1; i >= 0; i--) {
		c += values[i] * weight;
		weight++;
		if (weight == 21)
			weight = 1;
	}
	c = c % 47;
	values[h] = c;
	buffer[h] = set_copy[c];

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

	/* Start character */
	strcpy(dest, "111141");

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

	/* Stop character */
	concat(dest, "1111411");
	expand(symbol, dest);

	symbol->text[length] = set_copy[c];
	symbol->text[length + 1] = set_copy[k];
	symbol->text[length + 2] = '\0';

	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[], int length) {
	/* Channel Code - According to ANSI/AIM BC12-1998 */

	int channels, i;
	int error_number = 0, range = 0, zeroes;
	char hrt[9];

	target_value = 0;

	if(length > 7) {
		strcpy(symbol->errtxt, "Input too long");
		return ERROR_TOO_LONG;
	}
	error_number = is_sane(NEON, source, length);
	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 = length + 1; }
	if(channels == 2) { channels = 3; }

	for(i = 0; i < 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);

	zeroes = channels - 1 - length;
	memset(hrt, '0', zeroes);
	strcpy(hrt + zeroes, (char *)source);
	ustrcpy(symbol->text, (unsigned char *)hrt);

	expand(symbol, pattern);

	return error_number;
}