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/*
* plessey.c -- encoding for Plessey
*
* Copyright (c) 2000 Leonid A. Broukhis (leob@mailcom.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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "barcode.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
static char * patterns[] = { "13", "31" };
/* this is ordered in decades to simplify encoding */
static char alphabet[] =
"0123456789" "ABCDEF";
/* stop sequence may be 231311313 (barcodemill.com) */
static char *fillers[] = { "031311331", "331311313" };
static int width = 16, startpos = 16;
/*
* Check that the text can be encoded. Returns 0 or -1.
* If it's all lowecase convert to uppercase and accept it
*/
int Barcode_pls_verify(char *text)
{
int i, upper = 0, lower = 0;
if (!strlen(text))
return -1;
for (i=0; text[i]; i++) {
if (!strchr(alphabet,toupper(text[i])))
return -1;
if (isupper(text[i])) upper++;
if (islower(text[i])) lower++;
}
if (upper && lower)
return -1;
return 0;
}
static int add_one(char *ptr, int code)
{
sprintf(ptr, "%s%s%s%s",
patterns[code & 1],
patterns[(code >> 1) & 1],
patterns[(code >> 2) & 1],
patterns[(code >> 3) & 1]
);
return 0;
}
/*
* The encoding functions fills the "partial" and "textinfo" fields.
* Lowercase chars are converted to uppercase
*/
int Barcode_pls_encode(struct Barcode_Item *bc)
{
static char *text;
static char *partial; /* dynamic */
static char *textinfo; /* dynamic */
char *c, *ptr, *textptr;
unsigned char *checkptr;
int i, code, textpos;
static char check[9] = {1,1,1,1,0,1,0,0,1};
if (bc->partial)
free(bc->partial);
if (bc->textinfo)
free(bc->textinfo);
bc->partial = bc->textinfo = NULL; /* safe */
if (!bc->encoding)
bc->encoding = strdup("plessey");
text = bc->ascii;
if (!text) {
bc->error = EINVAL;
return -1;
}
/* the partial code is 8 * (head + text + check + tail) + margin + term. */
partial = malloc( (strlen(text) + 4) * 8 + 3);
checkptr = calloc (1, strlen(text) * 4 + 8);
if (!partial || !checkptr) {
if (partial) free(partial);
if (checkptr) free(checkptr);
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);
free(checkptr);
return -1;
}
strcpy(partial, fillers[0]);
ptr = partial + strlen(partial);
textptr = textinfo;
textpos = startpos;
for (i=0; i<strlen(text); i++) {
c = strchr(alphabet, toupper(text[i]));
if (!c) {
bc->error = EINVAL; /* impossible if text is verified */
free(partial);
free(textinfo);
free(checkptr);
return -1;
}
code = c - alphabet;
add_one(ptr, code);
sprintf(textptr, "%i:12:%c ", textpos, toupper(text[i]));
textpos += width; /* width of each code */
textptr += strlen(textptr);
ptr += strlen(ptr);
checkptr[4*i] = code & 1;
checkptr[4*i+1] = (code >> 1) & 1;
checkptr[4*i+2] = (code >> 2) & 1;
checkptr[4*i+3] = (code >> 3) & 1;
}
textptr[-1] = '\0'; /* overwrite last space */
/* The CRC checksum is required */
for (i=0; i < 4*strlen(text); i++) {
int j;
if (checkptr[i])
for (j = 0; j < 9; j++)
checkptr[i+j] ^= check[j];
}
for (i = 0; i < 8; i++) {
sprintf(ptr, patterns[checkptr[strlen(text) * 4 + i]]);
ptr += 2;
}
fprintf(stderr, _("CRC: "));
for (i = 0; i < 8; i++) {
fputc('0' + checkptr[strlen(text) * 4 + i], stderr);
}
fputc('\n', stderr);
strcpy(ptr, fillers[1]);
bc->partial = partial;
bc->textinfo = textinfo;
free(checkptr);
return 0;
}
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