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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- */
/*
* (GLABELS) Label and Business Card Creation program for GNOME
*
* bc_postnet.c: GLabels POSTNET barcode module
*
* Copyright (C) 2001-2003 Jim Evins <evins@snaught.com>.
*
* 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 2 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* This module implements the POSTNET barcode specified in the USPS
* publication 25, Mar 2001.
*/
#include <config.h>
#include "bc-postnet.h"
#include <ctype.h>
#include <glib/gstring.h>
#include <glib/gstrfuncs.h>
#include <glib/gmessages.h>
#include "debug.h"
/*========================================================*/
/* Private macros and constants. */
/*========================================================*/
#define POSTNET_BAR_WIDTH 1.25
#define POSTNET_FULLBAR_HEIGHT 9.00
#define POSTNET_HALFBAR_HEIGHT 3.50
#define POSTNET_BAR_PITCH 3.25
#define POSTNET_HORIZ_MARGIN 9.00
#define POSTNET_VERT_MARGIN 3.00
/*===========================================*/
/* Private globals */
/*===========================================*/
static gchar *symbols[] = {
/* 0 */ "11000",
/* 1 */ "00011",
/* 2 */ "00101",
/* 3 */ "00110",
/* 4 */ "01001",
/* 5 */ "01010",
/* 6 */ "01100",
/* 7 */ "10001",
/* 8 */ "10010",
/* 9 */ "10100",
};
static gchar *frame_symbol = "1";
/*===========================================*/
/* Local function prototypes */
/*===========================================*/
static gchar *postnet_code (const gchar *digits);
static gboolean is_length_valid (const gchar *digits,
gint n);
/****************************************************************************/
/* Generate list of lines that form the barcode for the given digits. */
/****************************************************************************/
glBarcode *
gl_barcode_postnet_new (const gchar *id,
gboolean text_flag,
gboolean checksum_flag,
gdouble w,
gdouble h,
const gchar *digits)
{
gchar *code, *p;
glBarcode *gbc;
glBarcodeLine *line;
gdouble x;
/* Validate code length for all subtypes. */
if ( (g_strcasecmp (id, "POSTNET") == 0) ) {
if (!is_length_valid (digits, 5) &&
!is_length_valid (digits, 9) &&
!is_length_valid (digits, 11)) {
return NULL;
}
}
if ( (g_strcasecmp (id, "POSTNET-5") == 0) ) {
if (!is_length_valid (digits, 5)) {
return NULL;
}
}
if ( (g_strcasecmp (id, "POSTNET-9") == 0) ) {
if (!is_length_valid (digits, 9)) {
return NULL;
}
}
if ( (g_strcasecmp (id, "POSTNET-11") == 0) ) {
if (!is_length_valid (digits, 11)) {
return NULL;
}
}
if ( (g_strcasecmp (id, "CEPNET") == 0) ) {
if (!is_length_valid (digits, 8)) {
return NULL;
}
}
/* First get code string */
code = postnet_code (digits);
if (code == NULL) {
return NULL;
}
gbc = g_new0 (glBarcode, 1);
/* Now traverse the code string and create a list of lines */
x = POSTNET_HORIZ_MARGIN;
for (p = code; *p != 0; p++) {
line = g_new0 (glBarcodeLine, 1);
line->x = x;
line->y = POSTNET_VERT_MARGIN;
if (*p == '0') {
line->y +=
POSTNET_FULLBAR_HEIGHT - POSTNET_HALFBAR_HEIGHT;
line->length = POSTNET_HALFBAR_HEIGHT;
} else {
line->length = POSTNET_FULLBAR_HEIGHT;
}
line->width = POSTNET_BAR_WIDTH;
gbc->lines = g_list_append (gbc->lines, line);
x += POSTNET_BAR_PITCH;
}
g_free (code);
gbc->width = x + POSTNET_HORIZ_MARGIN;
gbc->height = POSTNET_FULLBAR_HEIGHT + 2 * POSTNET_VERT_MARGIN;
gbc->chars = NULL;
return gbc;
}
/*--------------------------------------------------------------------------*/
/* PRIVATE. Generate string of symbols, representing barcode. */
/*--------------------------------------------------------------------------*/
static gchar *
postnet_code (const gchar *digits)
{
gchar *p;
gint len;
gint d, sum;
GString *code;
gchar *ret;
/* Left frame bar */
code = g_string_new (frame_symbol);
sum = 0;
for (p = (gchar *)digits, len = 0; (*p != 0) && (len < 11); p++) {
if (g_ascii_isdigit (*p)) {
/* Only translate valid characters (0-9) */
d = (*p) - '0';
sum += d;
code = g_string_append (code, symbols[d]);
len++;
}
}
/* Create correction character */
d = (10 - (sum % 10)) % 10;
code = g_string_append (code, symbols[d]);
/* Right frame bar */
code = g_string_append (code, frame_symbol);
ret = g_strdup (code->str);
g_string_free (code, TRUE);
return ret;
}
/*--------------------------------------------------------------------------*/
/* Validate specific length of string (for subtypes). */
/*--------------------------------------------------------------------------*/
static gboolean
is_length_valid (const gchar *digits,
gint n)
{
gchar *p;
gint i;
if (!digits) {
return FALSE;
}
for (p = (gchar *)digits, i=0; *p != 0; p++) {
if (g_ascii_isdigit (*p)) {
i++;
}
}
return (i == n);
}
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