--- /dev/null
+/*
+ * lgl-barcode-postnet.c
+ * Copyright (C) 2001-2010 Jim Evins <evins@snaught.com>.
+ *
+ * This file is part of libglbarcode.
+ *
+ * libglbarcode is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * libglbarcode 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with libglbarcode. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * This module implements the POSTNET barcode specified in the USPS
+ * publication 25, Mar 2001.
+ */
+
+#include <config.h>
+
+#include "lgl-barcode-postnet.h"
+
+#include <glib.h>
+#include <ctype.h>
+
+
+/*========================================================*/
+/* Private macros and constants. */
+/*========================================================*/
+
+#define PTS_PER_INCH 72.0
+
+#define POSTNET_BAR_WIDTH ( 0.02 * PTS_PER_INCH )
+#define POSTNET_FULLBAR_HEIGHT ( 0.125 * PTS_PER_INCH )
+#define POSTNET_HALFBAR_HEIGHT ( 0.05 * PTS_PER_INCH )
+#define POSTNET_BAR_PITCH ( 0.04545 * PTS_PER_INCH )
+#define POSTNET_HORIZ_MARGIN ( 0.125 * PTS_PER_INCH )
+#define POSTNET_VERT_MARGIN ( 0.04 * PTS_PER_INCH )
+
+
+/*===========================================*/
+/* 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 gint postnet_validate_data (const gchar *data);
+
+static gchar *postnet_encode (const gchar *digits);
+
+static lglBarcode *postnet_vectorize (const gchar *code);
+
+
+
+/****************************************************************************/
+/* Generate new Postnet barcode structure from data. */
+/****************************************************************************/
+lglBarcode *
+lgl_barcode_postnet_new (lglBarcodeType type,
+ gboolean text_flag,
+ gboolean checksum_flag,
+ gdouble w,
+ gdouble h,
+ const gchar *data)
+{
+ gint n_digits;
+ gchar *code;
+ lglBarcode *bc;
+
+ /* Validate data and length for all subtypes. */
+ n_digits = postnet_validate_data (data);
+ switch (type)
+ {
+
+ case LGL_BARCODE_TYPE_POSTNET:
+ if ( (n_digits != 5) &&
+ (n_digits != 9) &&
+ (n_digits != 11) )
+ {
+ return NULL;
+ }
+ break;
+
+ case LGL_BARCODE_TYPE_POSTNET_5:
+ if ( n_digits != 5 )
+ {
+ return NULL;
+ }
+ break;
+
+ case LGL_BARCODE_TYPE_POSTNET_9:
+ if ( n_digits != 9 )
+ {
+ return NULL;
+ }
+ break;
+
+ case LGL_BARCODE_TYPE_POSTNET_11:
+ if ( n_digits != 11 )
+ {
+ return NULL;
+ }
+ break;
+
+ case LGL_BARCODE_TYPE_CEPNET:
+ if ( n_digits != 8 )
+ {
+ return NULL;
+ }
+ break;
+
+ default:
+ g_message ("Invalid barcode type for POSTNET backend.");
+ return NULL;
+
+ }
+
+ /* First get code string */
+ code = postnet_encode (data);
+ if (code == NULL)
+ {
+ return NULL;
+ }
+
+ /* Now vectorize encoded data */
+ bc = postnet_vectorize (code);
+
+ g_free (code);
+
+ return bc;
+}
+
+
+/*--------------------------------------------------------------------------*/
+/* PRIVATE. Validate data, returning number of digits if valid. */
+/*--------------------------------------------------------------------------*/
+static gint
+postnet_validate_data (const gchar *data)
+{
+ gchar *p;
+ gint i;
+
+ if (!data)
+ {
+ return 0;
+ }
+
+ for ( p = (gchar *)data, i=0; *p != 0; p++ )
+ {
+ if (g_ascii_isdigit (*p))
+ {
+ i++;
+ }
+ else if ( (*p != '-') && (*p != ' ') )
+ {
+ /* Only allow digits, dashes, and spaces. */
+ return 0;
+ }
+ }
+
+ return i;
+}
+
+
+/*--------------------------------------------------------------------------*/
+/* PRIVATE. Generate string of symbols, representing barcode. */
+/*--------------------------------------------------------------------------*/
+static gchar *
+postnet_encode (const gchar *data)
+{
+ gchar *p;
+ gint len;
+ gint d, sum;
+ GString *code;
+
+ /* Left frame bar */
+ code = g_string_new (frame_symbol);
+
+ sum = 0;
+ for ( p = (gchar *)data, len = 0; (*p != 0) && (len < 11); p++ )
+ {
+ if (g_ascii_isdigit (*p))
+ {
+ /* Only translate the digits (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);
+
+ return g_string_free (code, FALSE);
+}
+
+
+/*--------------------------------------------------------------------------*/
+/* PRIVATE. Vectorize encoded barcode. */
+/*--------------------------------------------------------------------------*/
+static lglBarcode *
+postnet_vectorize (const gchar *code)
+{
+ lglBarcode *bc;
+ gchar *p;
+ gdouble x, y, length, width;
+
+ bc = lgl_barcode_new ();
+
+ /* Now traverse the code string and create a list of lines */
+ x = POSTNET_HORIZ_MARGIN;
+ for ( p = (gchar *)code; *p != 0; p++ )
+ {
+ y = POSTNET_VERT_MARGIN;
+ switch (*p)
+ {
+ case '0':
+ y += POSTNET_FULLBAR_HEIGHT - POSTNET_HALFBAR_HEIGHT;
+ length = POSTNET_HALFBAR_HEIGHT;
+ break;
+ case '1':
+ length = POSTNET_FULLBAR_HEIGHT;
+ break;
+ default:
+ break;
+ }
+ width = POSTNET_BAR_WIDTH;
+
+ lgl_barcode_add_box (bc, x, y, width, length);
+
+ x += POSTNET_BAR_PITCH;
+ }
+
+ bc->width = x + POSTNET_HORIZ_MARGIN;
+ bc->height = POSTNET_FULLBAR_HEIGHT + 2 * POSTNET_VERT_MARGIN;
+
+ return bc;
+}
+
+
+
+/*
+ * Local Variables: -- emacs
+ * mode: C -- emacs
+ * c-basic-offset: 8 -- emacs
+ * tab-width: 8 -- emacs
+ * indent-tabs-mode: nil -- emacs
+ * End: -- emacs
+ */
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