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+/*
+ * code39.c -- encoding for code39
+ *
+ * Copyright (c) 1999 Alessandro Rubini (rubini@gnu.org)
+ * Copyright (c) 1999 Prosa Srl. (prosa@prosa.it)
+ *
+ *   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.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <errno.h>
+
+#include "barcode.h"
+
+
+/* this is ordered in decades to simplify encoding */
+static char alphabet[] = 
+   "1234567890" "ABCDEFGHIJ" "KLMNOPQRST" "UVWXYZ-. *" "$/+%";
+
+/* the checksum alphabet has a different order */
+static char checkbet[] = 
+   "0123456789" "ABCDEFGHIJ" "KLMNOPQRST" "UVWXYZ-. $" "/+%";
+
+/* The first 40 symbols repeat this bar pattern */
+static char *bars[] = {
+   "31113","13113","33111","11313","31311",
+   "13311","11133","31131","13131","11331"};
+
+/* The first 4 decades use these space patterns */
+static char *spaces[] = {"1311","1131","1113","3111"};
+
+/* the last four symbols are special */
+static char *specialbars[] = {
+   "11111","11111","11111","11111"};
+
+static char *specialspaces[] = {
+   "3331","3313","3133","1333"};
+
+static char *fillers[]= {
+    "0a3a1c1c1a",
+    "1a3a1c1c1a"
+};
+
+
+/*
+ * Check that the text can be encoded. Returns 0 or -1.
+ * If it's all lowecase convert to uppercase and accept it
+ */
+int Barcode_39_verify(unsigned char *text)
+{
+    int i, lower=0, upper=0;
+
+    if (text[0] == '\0')
+	return -1;
+    for (i=0; text[i]; i++) {
+        if (isupper(text[i])) upper++;
+        if (islower(text[i])) lower++;
+        if (!strchr(alphabet,toupper(text[i])))
+            return -1;
+    }
+    if (lower && upper)
+        return -1;
+    return 0;
+}
+
+static int add_one(char *ptr, int code)
+{
+    char *b, *s;
+
+    if (code < 40) {
+        b = bars[code%10];
+        s = spaces[code/10];
+    } else {
+        b = specialbars[code-40];
+        s = specialspaces[code-40];
+    }
+    sprintf(ptr,"1%c%c%c%c%c%c%c%c%c", /* separator */
+            b[0], s[0], b[1], s[1], b[2], s[2],
+            b[3], s[3], b[4]);
+    return 0;
+}
+
+/*
+ * The encoding functions fills the "partial" and "textinfo" fields.
+ * Lowercase chars are converted to uppercase
+ */
+int Barcode_39_encode(struct Barcode_Item *bc)
+{
+    static char *text;
+    static char *partial;  /* dynamic */
+    static char *textinfo; /* dynamic */
+    char *c, *ptr, *textptr;
+    int i, code, textpos, checksum = 0;
+
+    if (bc->partial)
+	free(bc->partial);
+    if (bc->textinfo)
+	free(bc->textinfo);
+    bc->partial = bc->textinfo = NULL; /* safe */
+
+    if (!bc->encoding)
+	bc->encoding = strdup("code 39");
+
+    text = bc->ascii;
+    if (!text) {
+        bc->error = EINVAL;
+        return -1;
+    }
+    /* the partial code is 10* (head + text + check + tail) + margin + term. */
+    partial = malloc( (strlen(text) + 3) * 10 +2);
+    if (!partial) {
+        bc->error = errno;
+        return -1;
+    }
+
+    /* the text information is at most "nnn:fff:c " * strlen +term */
+    textinfo = malloc(10*strlen(text) + 2);
+    if (!textinfo) {
+        bc->error = errno;
+        free(partial);
+        return -1;
+    }
+
+    strcpy(partial, fillers[0]);
+    ptr = partial + strlen(partial);
+    textptr = textinfo;
+    textpos = 22;
+
+    for (i=0; text[i]; i++) {
+        c = strchr(alphabet, toupper(text[i]));
+        if (!c) {
+            bc->error = EINVAL; /* impossible if text is verified */
+            free(partial);
+            free(textinfo);
+            return -1;
+        }
+        code = c - alphabet;
+        add_one(ptr, code);
+        c = strchr(checkbet,*c);
+        if (c) /* the '*' is not there */
+            checksum += (c-checkbet);
+        sprintf(textptr, "%i:12:%c ", textpos, toupper(text[i]));
+        
+        textpos += 16; /* width of each code */
+        textptr += strlen(textptr);
+        ptr += strlen(ptr); 
+    }
+    /* Add the checksum */
+    if ( (bc->flags & BARCODE_NO_CHECKSUM)==0 ) {
+	code = (strchr(alphabet, checkbet[checksum % 43]) - alphabet);
+	add_one(ptr, code);
+    }
+    strcat(ptr, fillers[1]); /* end */
+    bc->partial = partial;
+    bc->textinfo = textinfo;
+
+    return 0;
+}