zint/backend/code49.c

/* code49.c - Handles Code 49 */

/*
    libzint - the open source barcode library
    Copyright (C) 2009 Robin Stuart <robin@zint.org.uk>

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

    1. Redistributions of source code must retain the above copyright 
       notice, this list of conditions and the following disclaimer.  
    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.  
    3. Neither the name of the project nor the names of its contributors
       may be used to endorse or promote products derived from this software
       without specific prior written permission. 

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
    ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
    FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
    OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
    SUCH DAMAGE.
*/

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "common.h"
#include "code49.h"

#define INSET	"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%!&*"
/* "!" represents Shift 1 and "&" represents Shift 2, "*" represents FNC1 */

int code_49(struct zint_symbol *symbol, unsigned char source[], int length)
{
	int i, j, rows, M, x_count, y_count, z_count, posn_val, local_value, h;
	char intermediate[170];
	int codewords[170], codeword_count;
	int c_grid[8][8]; /* Refers to table 3 */
	int w_grid[8][4]; /* Refets to table 2 */
	int pad_count = 0;
	char pattern[40];
	int gs1;

	if(length > 81) {
		strcpy(symbol->errtxt, "Input too long");
		return ZINT_ERROR_TOO_LONG;
	}
	if(symbol->input_mode == GS1_MODE) { gs1 = 1; } else { gs1 = 0; }

	strcpy(intermediate, gs1 ? "*" : ""); /* FNC1 */
	for(i = 0; i < length; i++) {
		if(source[i] > 127) {
			strcpy(symbol->errtxt, "Invalid characters in input data");
			return ZINT_ERROR_INVALID_DATA;
		}
		if(gs1 && (source[i] == '['))
			concat(intermediate, "*"); /* FNC1 */
		else
			concat(intermediate, c49_table7[source[i]]);
	}

	codeword_count = 0;
	i = 0;
	h = strlen(intermediate);
	do {
		if((intermediate[i] >= '0') && (intermediate[i] <= '9')) {
			/* Numeric data */
			for(j = 0; (intermediate[i + j] >= '0') && (intermediate[i + j] <= '9'); j++);
			if(j >= 5) {
				/* Use Numeric Encodation Method */
				int block_count, c;
				int block_remain;
				int block_value;

				codewords[codeword_count] = 48; /* Numeric Shift */
				codeword_count++;

				block_count = j / 5;
				block_remain = j % 5;

				for(c = 0; c < block_count; c++) {
					if((c == block_count - 1) && (block_remain == 2)) {
						/* Rule (d) */
						block_value = 100000;
						block_value += ctoi(intermediate[i]) * 1000;
						block_value += ctoi(intermediate[i + 1]) * 100;
						block_value += ctoi(intermediate[i + 2]) * 10;
						block_value += ctoi(intermediate[i + 3]);

						codewords[codeword_count] = block_value / (48 * 48);
						block_value = block_value - (48 * 48) * codewords[codeword_count];
						codeword_count++;
						codewords[codeword_count] = block_value / 48;
						block_value = block_value - 48 * codewords[codeword_count];
						codeword_count++;
						codewords[codeword_count] = block_value;
						codeword_count++;
						i += 4;
						block_value = ctoi(intermediate[i]) * 100;
						block_value += ctoi(intermediate[i + 1]) * 10;
						block_value += ctoi(intermediate[i + 2]);

						codewords[codeword_count] = block_value / 48;
						block_value = block_value - 48 * codewords[codeword_count];
						codeword_count++;
						codewords[codeword_count] = block_value;
						codeword_count++;
						i += 3;
					} else {
						block_value = ctoi(intermediate[i]) * 10000;
						block_value += ctoi(intermediate[i + 1]) * 1000;
						block_value += ctoi(intermediate[i + 2]) * 100;
						block_value += ctoi(intermediate[i + 3]) * 10;
						block_value += ctoi(intermediate[i + 4]);

						codewords[codeword_count] = block_value / (48 * 48);
						block_value = block_value - (48 * 48) * codewords[codeword_count];
						codeword_count++;
						codewords[codeword_count] = block_value / 48;
						block_value = block_value - 48 * codewords[codeword_count];
						codeword_count++;
						codewords[codeword_count] = block_value;
						codeword_count++;
						i += 5;
					}
				}

				switch(block_remain) {
					case 1:
						/* Rule (a) */
						codewords[codeword_count] = posn(INSET, intermediate[i]);
						codeword_count++;
						i++;
						break;
					case 3:
						/* Rule (b) */
						block_value = ctoi(intermediate[i]) * 100;
						block_value += ctoi(intermediate[i + 1]) * 10;
						block_value += ctoi(intermediate[i + 2]);

						codewords[codeword_count] = block_value / 48;
						block_value = block_value - 48 * codewords[codeword_count];
						codeword_count++;
						codewords[codeword_count] = block_value;
						codeword_count++;
						i += 3;
						break;
					case 4:
						/* Rule (c) */
						block_value = 100000;
						block_value += ctoi(intermediate[i]) * 1000;
						block_value += ctoi(intermediate[i + 1]) * 100;
						block_value += ctoi(intermediate[i + 2]) * 10;
						block_value += ctoi(intermediate[i + 3]);

						codewords[codeword_count] = block_value / (48 * 48);
						block_value = block_value - (48 * 48) * codewords[codeword_count];
						codeword_count++;
						codewords[codeword_count] = block_value / 48;
						block_value = block_value - 48 * codewords[codeword_count];
						codeword_count++;
						codewords[codeword_count] = block_value;
						codeword_count++;
						i += 4;
						break;
				}
				if(i < h) {
					/* There is more to add */
					codewords[codeword_count] = 48; /* Numeric Shift */
					codeword_count++;
				}
			} else {
				codewords[codeword_count] = posn(INSET, intermediate[i]);
				codeword_count++;
				i++;
			}
		} else {
			codewords[codeword_count] = posn(INSET, intermediate[i]);
			codeword_count++;
			i++;
		}
	} while(i < h);

	switch(codewords[0]) { /* Set starting mode value */
		case 48: M = 2; break;
		case 43: M = 4; break;
		case 44: M = 5; break;
		default: M = 0; break;
	}

	if(M != 0) {
		for(i = 0; i < codeword_count; i++) {
			codewords[i] = codewords[i + 1];
		}
		codeword_count--;
	}

	if(codeword_count > 49) {
		strcpy(symbol->errtxt, "Input too long");
		return ZINT_ERROR_TOO_LONG;
	}

	/* Place codewords in code character array (c grid) */
	rows = 0;
	do{
		for(i = 0; i < 7; i++) {
			if(((rows * 7) + i) < codeword_count) {
				c_grid[rows][i] = codewords[(rows * 7) + i];
			} else {
				c_grid[rows][i] = 48; /* Pad */
				pad_count++;
			}
		}
		rows++;
	} while ((rows * 7) < codeword_count);

	if((((rows <= 6) && (pad_count < 5))) || (rows > 6) || (rows == 1)) {
		/* Add a row */
		for(i = 0; i < 7; i++) {
			c_grid[rows][i] = 48; /* Pad */
		}
		rows++;
	}

	/* Add row count and mode character */
	c_grid[rows - 1][6] = (7 * (rows - 2)) + M;

	/* Add row check character */
	for(i = 0; i < rows - 1; i++) {
		int row_sum = 0;

		for(j = 0; j < 7; j++) {
			row_sum += c_grid[i][j];
		}
		c_grid[i][7] = row_sum % 49;
	}

	/* Calculate Symbol Check Characters */
	posn_val = 0;
	x_count = c_grid[rows - 1][6] * 20;
	y_count = c_grid[rows - 1][6] * 16;
	z_count = c_grid[rows - 1][6] * 38;
	for(i = 0; i < rows - 1; i++) {
		for(j = 0; j < 4; j++) {
			local_value = (c_grid[i][2 * j] * 49) + c_grid[i][(2 * j) + 1];
			x_count += c49_x_weight[posn_val] * local_value;
			y_count += c49_y_weight[posn_val] * local_value;
			z_count += c49_z_weight[posn_val] * local_value;
			posn_val++;
		}
	}

	if(rows > 6) {
		/* Add Z Symbol Check */
		c_grid[rows - 1][0] = (z_count % 2401) / 49;
		c_grid[rows - 1][1] = (z_count % 2401) % 49;
	}

	local_value = (c_grid[rows - 1][0] * 49) + c_grid[rows - 1][1];
	x_count += c49_x_weight[posn_val] * local_value;
	y_count += c49_y_weight[posn_val] * local_value;
	posn_val++;

	/* Add Y Symbol Check */
	c_grid[rows - 1][2] = (y_count % 2401) / 49;
	c_grid[rows - 1][3] = (y_count % 2401) % 49;

	local_value = (c_grid[rows - 1][2] * 49) + c_grid[rows - 1][3];
	x_count += c49_x_weight[posn_val] * local_value;

	/* Add X Symbol Check */
	c_grid[rows - 1][4] = (x_count % 2401) / 49;
	c_grid[rows - 1][5] = (x_count % 2401) % 49;

	/* Add last row check character */
	j = 0;
	for(i = 0; i < 7; i++) {
		j += c_grid[rows - 1][i];
	}
	c_grid[rows - 1][7] = j % 49;

	/* Transfer data to symbol character array (w grid) */
	for(i = 0; i < rows; i++) {
		for(j = 0; j < 4; j ++) {
			w_grid[i][j] = (c_grid[i][2 * j] * 49) + c_grid[i][(2 * j) + 1];
		}
	}

	for(i = 0; i < rows; i++) {
		strcpy(pattern, "11"); /* Start character */
		for(j = 0; j < 4; j++) {
			if(i != (rows - 1)) {
				if(c49_table4[i][j] == 'E') {
					/* Even Parity */
					concat(pattern, c49_appxe_even[w_grid[i][j]]);
				} else {
					/* Odd Parity */
					concat(pattern, c49_appxe_odd[w_grid[i][j]]);
				}
			} else {
				/* Last row uses all even parity */
				concat(pattern, c49_appxe_even[w_grid[i][j]]);
			}
		}
		concat(pattern, "4"); /* Stop character */

		/* Expand into symbol */
		symbol->row_height[i] = 10;
		expand(symbol, pattern);
	}

	symbol->whitespace_width = 10;
	symbol->output_options = BARCODE_BIND;
	symbol->border_width = 2;

	return 0;
}