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2026-08-25 10:37:57 +08:00
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BarCode/code128.c
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/*
* code128.c -- encoding for code128 (A, B, C)
*
* Copyright (c) 1999,2000 Alessandro Rubini (rubini@gnu.org)
* Copyright (c) 1999 Prosa Srl. (prosa@prosa.it)
* 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 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"
//0 b1a2a4 123221 223211 221132 221231 213212 223112 312131 311222 314111 b3c1a1b
static char *codeset[] = {
"212222", "222122", "222221", "121223", "121322", /* 0 - 4 */
"131222", "122213", "122312", "132212", "221213",
"221312", "231212", "112232", "122132", "122231", /* 10 - 14 */
"113222", "123122", "123221", "223211", "221132",
"221231", "213212", "223112", "312131", "311222", /* 20 - 24 */
"321122", "321221", "312212", "322112", "322211",
"212123", "212321", "232121", "111323", "131123", /* 30 - 34 */
"131321", "112313", "132113", "132311", "211313",
"231113", "231311", "112133", "112331", "132131", /* 40 - 44 */
"113123", "113321", "133121", "313121", "211331",
"231131", "213113", "213311", "213131", "311123", /* 50 - 54 */
"311321", "331121", "312113", "312311", "332111",
"314111", "221411", "431111", "111224", "111422", /* 60 - 64 */
"121124", "121421", "141122", "141221", "112214",
"112412", "122114", "122411", "142112", "142211", /* 70 - 74 */
"241211", "221114", "413111", "241112", "134111",
"111242", "121142", "121241", "114212", "124112", /* 80 - 84 */
"124211", "411212", "421112", "421211", "212141",
"214121", "412121", "111143", "111341", "131141", /* 90 - 94 */
"114113", "114311", "411113", "411311", "113141",
"114131", "311141", "411131", "b1a4a2", "b1a2a4", /* 100 - 104 */
"b1a2c2", "b3c1a1b"
};
// "114131", "311141", "411131", "211412", "211214", /* 100 - 104 */
// "211232", "2331112"
//0 b1a2a4 123221 223211 221132 221231 213212 223112 312131 311222 314111 b3c1a1b
// 211214 2331112
/*
1,1,4,1,3,1,// CodeB FNC4 CodeB
3,1,1,1,4,1,// FNC4 CodeA CodeA
4,1,1,1,3,1,// FNC1 FNC1 FNC1
2,1,1,4,1,2,// StartA
2,1,1,2,1,4,// StartB
2,1,1,2,3,2,// StartC
2,3,3,1,1,1,2,// Stop
*/
#define START_A 103
#define START_B 104
#define START_C 105
#define STOP 106
#define SHIFT 98 /* only A and B */
#define CODE_A 101 /* only B and C */
#define CODE_B 100 /* only A and C */
#define CODE_C 99 /* only A and B */
#define FUNC_1 102 /* all of them */
#define FUNC_2 97 /* only A and B */
#define FUNC_3 96 /* only A and B */
/* FUNC_4 is CODE_A when in A and CODE_B when in B */
#define SYMBOL_WID 11 /* all of them are 11-bar wide */
/*
* code 128-b includes all printable ascii chars
*/
int Barcode_128b_verify(unsigned char *text)
{
if (text[0] == '\0')
return -1;
while (*text && *text>=32 && !(*text&0x80))
text++;
if (*text)
return -1; /* a non-ascii char */
return 0; /* ok */
}
int Barcode_128b_encode(struct Barcode_Item *bc)
{
static char *text;
static char *partial; /* dynamic */
static char *textinfo; /* dynamic */
char *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 128-B");
text = bc->ascii;
if (!text) {
bc->error = EINVAL;
return -1;
}
/* the partial code is 6* (head + text + check + tail) + final + term. */
partial = malloc( (strlen(text) + 4) * 6 +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;
}
/* up to now, it was the same code as other encodings */
strcpy(partial, "0"); /* the first space */
strcat(partial, codeset[START_B]);
checksum += START_B; /* the start char is counted in the checksum */
textptr = textinfo;
textpos = SYMBOL_WID;
for (i=0; i<strlen(text); i++) {
if ( text[i] < 32 || (text[i] & 0x80)) {
bc->error = EINVAL; /* impossible if text is verified */
free(partial);
free(textinfo);
return -1;
}
code = text[i]-32;
strcat(partial, codeset[code]);
checksum += code * (i+1); /* first * 1 + second * 2 + third * 3... */
sprintf(textptr, "%i:12:%c ", textpos, text[i]);
textptr += strlen(textptr);
textpos += SYMBOL_WID; /* width of each code */
}
/* Add the checksum, independent of BARCODE_NO_CHECKSUM */
checksum %= 103;
strcat(partial, codeset[checksum]);
/* and the end marker */
strcat(partial, codeset[STOP]);
bc->partial = partial;
bc->textinfo = textinfo;
return 0;
}
/*
* code 128-c is only digits, but two per symbol
*/
int Barcode_128c_verify(unsigned char *text)
{
if (text[0] == '\0')
return -1;
/* must be an even number of digits */
if (strlen(text)%2)
return -1;
/* and must be all digits */
for (; *text; text++)
if (!isdigit(*text))
return -1;
return 0;
}
int Barcode_128c_encode(struct Barcode_Item *bc)
{
static char *text;
static char *partial; /* dynamic */
static char *textinfo; /* dynamic */
char *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 128-C");
text = bc->ascii;
if (!text) {
bc->error = EINVAL;
return -1;
}
/* the partial code is 6* (head + text + check + tail) + final + term. */
partial = malloc( (strlen(text) + 3) * 6 +2);
if (!partial) {
bc->error = errno;
return -1;
}
/* the text information is at most "nnn.5:fff:c " * strlen +term */
textinfo = malloc(12*strlen(text) + 2);
if (!textinfo) {
bc->error = errno;
free(partial);
return -1;
}
strcpy(partial, "0"); /* the first space */
strcat(partial, codeset[START_C]);
checksum += START_C; /* the start char is counted in the checksum */
textptr = textinfo;
textpos = SYMBOL_WID;
for (i=0; text[i]; i+=2) {
if (!isdigit(text[i]) || !isdigit(text[i+1])) {
bc->error = EINVAL; /* impossible if text is verified */
free(partial);
free(textinfo);
return -1;
}
code = (text[i]-'0') * 10 + text[i+1]-'0';
strcat(partial, codeset[code]);
checksum += code * (i/2+1); /* first * 1 + second * 2 + third * 3... */
/* print as "%s", because we have ".5" positions */
sprintf(textptr, "%g:9:%c %g:9:%c ", (double)textpos, text[i],
textpos + (double)SYMBOL_WID/2, text[i+1]);
textptr += strlen(textptr);
textpos += SYMBOL_WID; /* width of each code */
}
/* Add the checksum, independent of BARCODE_NO_CHECKSUM */
checksum %= 103;
strcat(partial, codeset[checksum]);
/* and the end marker */
strcat(partial, codeset[STOP]);
bc->partial = partial;
bc->textinfo = textinfo;
return 0;
}
/*
* generic (full-featured) code128 implementation: it selects between
* A, B, C according to the data being encoded. F1, F2, F3, F4 are expressed
* using ascii chars 0xc1, 0xc2, 0xc3, 0xc4 (0301, 0302, 0303, 0304).
* Char '\0' is expressed by 0x80 (0200).
*/
int Barcode_128_verify(unsigned char *text)
{
if (text[0] == '\0')
return -1;
while (*text && (*text<=0x80 || (*text >= 0xc1 && *text <= 0xc4)))
text++;
if (*text)
return -1; /* unencodable character */
return 0; /* ok */
}
/*
* These functions are extracted from Barcode_128_encode for clarity.
* It deals with choosing the symbols used to represent the text
* and returns a dynamic array of integers, terminated by -1.
*
* The algorithm used in choosing the codes comes from App 2 of
* "El Codigo Estandar EAN/UCC 128", courtesy of AECOC, Spain.
* Thanks to Dani Pardo for getting permission and giving me a copy
* of the document
*/
#define NEED_CODE_A(c) ((c)<32 || (c)==0x80)
#define NEED_CODE_B(c) ((c)>=96 && (c)<128)
static int Barcode_a_or_b(unsigned char *text)
{
for ( ; *text; text++) {
if (NEED_CODE_A(*text))
return 'A';
if (NEED_CODE_B(*text))
return 'B';
}
return 0; /* any */
}
/* code is either 'A' or 'B', and value must be valid */
static int Barcode_encode_as(int code, int value)
{
/* first check the special chars */
if (value == 0xC1) return FUNC_1;
if (value == 0xC2) return FUNC_2;
if (value == 0xC3) return FUNC_3;
if (value == 0xC4) { /* F4 */
if (code == 'A') return CODE_A;
return CODE_B;
}
/* then check ascii values */
if (value >= 0x20 && value <= 0x5F)
return value - 0x20; /* both codes */
if (value == 0x80) return 64; /* code A */
if (value < 0x20) return value+64; /* code A */
if (value >= 0x60) return value - 0x20; /* code B */
/* can't happen */
return -1;
}
static int *Barcode_128_make_array(struct Barcode_Item *bc, int *lptr)
{
int len, *codes;
unsigned char *s;
int i=0, j, code, checksum;
/* allocate twice the text length + 5, as this is the worst case */
len = 2 * strlen(bc->ascii) + 5;
codes = malloc(len * sizeof(int));
s = bc->ascii;
/* choose the starting code */
if (s[2]=='\0' && isdigit(s[0]) && isdigit(s[1])) {
code = 'C';
} else if (isdigit(s[0])&&isdigit(s[1]) && isdigit(s[2])&&isdigit(s[3])) {
code = 'C';
} else {
code = Barcode_a_or_b(s);
if (!code) code = 'B'; /* default */
}
codes[i++] = START_A + code - 'A';
for (s = bc->ascii; *s; /* increments are in the loop */) {
switch(code) {
case 'C':
if (s[0] == 0xC1) { /* F1 is valid */
codes[i++] = FUNC_1;
s++;
} else if (isdigit(s[0]) && isdigit(s[1])) {
/* encode two digits */
codes[i++] = (s[0]-'0') * 10 + s[1]-'0';
s += 2;
} else {
/* change code */
code = Barcode_a_or_b(s);
if (!code) code = 'B';
codes[i++] = (code == 'A') ? CODE_A : CODE_B;
}
break;
case 'B':
case 'A':
for (j=0; isdigit(s[j]); j++)
;
if (j>=4) { /* if there are 4 or more digits, turn to C */
if (j&1) {
/* odd number: encode one first */
codes[i++] = *(s++) - ' ';
}
codes[i++] = CODE_C;
code = 'C';
} else if (code == 'A' && NEED_CODE_B(*s)) {
/* check whether we should use SHIFT or change code */
j = Barcode_a_or_b(s+1);
if (j == 'B') {
codes[i++] = CODE_B;
code = 'B';
} else {
codes[i++] = SHIFT;
codes[i++] = Barcode_encode_as('B', *s);
s++;
}
} else if (code == 'B' && NEED_CODE_A(*s)) {
/* check whether we should use SHIFT or change code */
j = Barcode_a_or_b(s+1);
if (j == 'A') {
codes[i++] = CODE_A;
code = 'A';
} else {
codes[i++] = SHIFT;
codes[i++] = Barcode_encode_as('A', *s);
s++;
}
} else {
codes[i++] = Barcode_encode_as(code, *s);
s++;
}
break;
}
}
/* add the checksum */
checksum = codes[0];
for (j=1; j<i; j++)
checksum += j * codes[j];
checksum %= 103;
codes[i++] = checksum;
codes[i++] = STOP;
if (i > len) {
fprintf(stderr, "impossible: length is > allocated len\n");
}
*lptr = i;
return codes;
}
/*
* Encoding is tricky, in that we cannot print the ascii
* representation in an easy way. Therefore, just skip non-printable
* chars and try to fit the rest somehow.
*/
int Barcode_128_encode(struct Barcode_Item *bc)
{
static char *text;
static char *partial; /* dynamic */
static char *textinfo; /* dynamic */
char *textptr;
int *codes; /* dynamic */
int i, c, len;
double textpos, size, step;
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 128");
text = bc->ascii;
if (!text) {
bc->error = EINVAL;
return -1;
}
codes = Barcode_128_make_array(bc, &len);
if (!codes) return -1;
/* the partial code is 6*codelen + ini + term (+margin) */
partial = malloc( 6 * len + 4);
if (!partial) {
bc->error = errno;
free(codes);
return -1;
}
/* the text information is at most "nnn.n:ff.f:c " * strlen +term */
textptr = textinfo = malloc(13*strlen(text) + 2);
if (!textinfo) {
bc->error = errno;
free(partial);
free(codes);
return -1;
}
/* up to now, it was almost the same code as other encodings */
strcpy(partial, "0"); /* the first space */
for (i=0; i<len; i++) /* the symbols */
strcat(partial, codeset[codes[i]]);
/* avoid bars that fall lower than other bars */
for (i=0; partial[i]; i++)
if (isalpha(partial[i]))
partial[i] += '1' - 'a';
/*
* the accompanying text: reserve a space for every char.
* F[1-4] are rendered as spaces (separators), other unprintable chars
* are rendered as underscoress (placeholders)
*/
/*
* A size of 9 is good for code-C (used above), so 18 for each symbol,
* but we place an upper limit of 12 to avoid overlapping on the bars.
*/
size = (int)(180.0 * (len-3) / strlen(text) + .5) / 10.0;
if (size > 12.0) size = 12.0;
/* align the text to the left, using its natural size */
step = (int)(10 * (size/18.0 * SYMBOL_WID) + .5) / 10.0;
textpos = SYMBOL_WID;
for (i=0; i<strlen(text); i++) {
c = text[i];
if (c < 32 || c == 0x80) c = '_'; /* not printable */
if (c > 0xc0) c = ' '; /* F code */
sprintf(textptr, "%g:%g:%c ", textpos, size, c);
textptr += strlen(textptr);
textpos += step;
}
bc->partial = partial;
bc->textinfo = textinfo;
free(codes);
return 0;
}
/*
* A raw 128 code is given as a sequence of space separated numbers
* from 0 to 105, starting from the start code to be (Leonid)
*/
int Barcode_128raw_verify(unsigned char *text)
{
int n;
unsigned val;
if (!strlen(text))
return -1;
while (*text) {
if (sscanf(text, "%u%n", &val, &n) < 1)
return -1;
if (val > 105)
return -1;
text += n;
}
return 0;
}
int Barcode_128raw_encode(struct Barcode_Item *bc)
{
static char *text;
static char *partial; /* dynamic */
static char *textinfo; /* dynamic */
char *textptr;
int i, n, count, 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("128raw");
text = bc->ascii;
if (!text) {
bc->error = EINVAL;
return -1;
}
/*
* length of partial code is unknown in advance, but it is
* at most 6* (1+text/2 + check + tail) + final + terminator
*/
partial = malloc( (3+ strlen(text)/2) * 6 + 2);
if (!partial) {
bc->error = errno;
return -1;
}
/* the text information is at most "nnn.5:fff:c " * 1+strlen/2 +term */
textinfo = malloc(12 * (1+strlen(text)/2) + 2);
if (!textinfo) {
bc->error = errno;
free(partial);
return -1;
}
strcpy(partial, "0"); /* the first space */
textptr = textinfo;
textpos = 0;
for (i=0, count = 0; i < strlen(text); count++) {
if (sscanf(text + i, "%u%n", &code, &n) < 1) {
bc->error = EINVAL; /* impossible if text is verified */
free(partial);
free(textinfo);
return -1;
}
strcat(partial, codeset[code]);
/*
* since the start code is part of the "raw" input, it is
* counted in the checksum by itself
*/
if (!count) checksum += code; /* the start code */
else checksum += code * count; /* first * 1 + second * 2 ... */
/*
* print as "%s", because we have ".5" positions
* also, use a size of 9 like codeC above, as each symbol is
* represented by two chars
*/
sprintf(textptr, "%g:9:%c %g:9:%c ", (double)textpos,
code >= 100 ? 'A' : code/10 + '0',
textpos + (double)SYMBOL_WID/2, code%10 + '0');
textptr += strlen(textptr);
textpos += SYMBOL_WID; /* width of each code */
i += n;
}
/* Add the checksum, independent of BARCODE_NO_CHECKSUM */
checksum %= 103;
strcat(partial, codeset[checksum]);
/* and the end marker */
strcat(partial, codeset[STOP]);
bc->partial = partial;
bc->textinfo = textinfo;
return 0;
}