248 lines
7.6 KiB
Plaintext
248 lines
7.6 KiB
Plaintext
/*
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* library.c -- external functions of libbarcode
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*
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* Copyright (c) 1999 Alessandro Rubini (rubini@gnu.org)
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* Copyright (c) 1999 Prosa Srl. (prosa@prosa.it)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#ifdef HAVE_UNISTD_H /* sometimes (windows, for instance) it's missing */
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# include <unistd.h>
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#endif
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#include <errno.h>
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#include "barcode.h"
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//#include "QFile.h"
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//#include "QString.h"
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/*
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* This function allocates a barcode structure and strdup()s the
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* text string. It returns NULL in case of error
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*/
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struct Barcode_Item *Barcode_Create(char *text)
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{
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struct Barcode_Item *bc;
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bc = malloc(sizeof(*bc));
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if (!bc) return NULL;
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memset(bc, 0, sizeof(*bc));
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bc->ascii = strdup(text);
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bc->margin = BARCODE_DEFAULT_MARGIN; /* default margin */
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return bc;
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}
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/*
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* Free a barcode structure
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*/
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int Barcode_Delete(struct Barcode_Item *bc)
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{
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if (bc->ascii)
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free(bc->ascii);
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if (bc->partial)
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free(bc->partial);
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if (bc->textinfo)
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free(bc->textinfo);
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if (bc->encoding)
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free(bc->encoding);
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free(bc);
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return 0; /* always success */
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}
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/*
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* The various supported encodings. This might be extended to support
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* dynamic addition of extra encodings
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*/
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extern int Barcode_ean_verify(unsigned char *text);
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extern int Barcode_ean_encode(struct Barcode_Item *bc);
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extern int Barcode_upc_verify(unsigned char *text);
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extern int Barcode_upc_encode(struct Barcode_Item *bc);
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extern int Barcode_isbn_verify(unsigned char *text);
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extern int Barcode_isbn_encode(struct Barcode_Item *bc);
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extern int Barcode_39_verify(unsigned char *text);
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extern int Barcode_39_encode(struct Barcode_Item *bc);
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extern int Barcode_128b_verify(unsigned char *text);
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extern int Barcode_128b_encode(struct Barcode_Item *bc);
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extern int Barcode_128c_verify(unsigned char *text);
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extern int Barcode_128c_encode(struct Barcode_Item *bc);
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extern int Barcode_128_verify(unsigned char *text);
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extern int Barcode_128_encode(struct Barcode_Item *bc);
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extern int Barcode_128raw_verify(unsigned char *text);
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extern int Barcode_128raw_encode(struct Barcode_Item *bc);
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extern int Barcode_i25_verify(unsigned char *text);
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extern int Barcode_i25_encode(struct Barcode_Item *bc);
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extern int Barcode_cbr_verify(unsigned char *text);
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extern int Barcode_cbr_encode(struct Barcode_Item *bc);
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extern int Barcode_msi_verify(unsigned char *text);
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extern int Barcode_msi_encode(struct Barcode_Item *bc);
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extern int Barcode_pls_verify(unsigned char *text);
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extern int Barcode_pls_encode(struct Barcode_Item *bc);
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extern int Barcode_93_verify(unsigned char *text);
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extern int Barcode_93_encode(struct Barcode_Item *bc);
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struct encoding {
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int type;
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int (*verify)(unsigned char *text);
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int (*encode)(struct Barcode_Item *bc);
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};
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struct encoding encodings[] = {
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{BARCODE_EAN, Barcode_ean_verify, Barcode_ean_encode},
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{BARCODE_UPC, Barcode_upc_verify, Barcode_upc_encode},
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{BARCODE_ISBN, Barcode_isbn_verify, Barcode_isbn_encode},
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{BARCODE_128B, Barcode_128b_verify, Barcode_128b_encode},
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{BARCODE_128C, Barcode_128c_verify, Barcode_128c_encode},
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{BARCODE_128RAW, Barcode_128raw_verify, Barcode_128raw_encode},
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{BARCODE_39, Barcode_39_verify, Barcode_39_encode},
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{BARCODE_I25, Barcode_i25_verify, Barcode_i25_encode},
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{BARCODE_128, Barcode_128_verify, Barcode_128_encode},
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{BARCODE_CBR, Barcode_cbr_verify, Barcode_cbr_encode},
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{BARCODE_PLS, Barcode_pls_verify, Barcode_pls_encode},
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{BARCODE_MSI, Barcode_msi_verify, Barcode_msi_encode},
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{BARCODE_93, Barcode_93_verify, Barcode_93_encode},
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{0, NULL, NULL}
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};
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/*
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* A function to encode a string into bc->partial, ready for
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* postprocessing to the output file. Meaningful bits for "flags" are
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* the encoding mask and the no-checksum flag. These bits
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* get saved in the data structure.
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*/
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int Barcode_Encode(struct Barcode_Item *bc, int flags)
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{
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int validbits = BARCODE_ENCODING_MASK | BARCODE_NO_CHECKSUM;
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struct encoding *cptr;
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/* If any flag is cleared in "flags", inherit it from "bc->flags" */
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if (!(flags & BARCODE_ENCODING_MASK))
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flags |= bc->flags & BARCODE_ENCODING_MASK;
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if (!(flags & BARCODE_NO_CHECKSUM))
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flags |= bc->flags & BARCODE_NO_CHECKSUM;
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flags = bc->flags = (flags & validbits) | (bc->flags & ~validbits);
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if (!(flags & BARCODE_ENCODING_MASK)) {
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/* get the first code able to handle the text */
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for (cptr = encodings; cptr->verify; cptr++)
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if (cptr->verify((unsigned char *)bc->ascii)==0)
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break;
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if (!cptr->verify) {
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bc->error = EINVAL; /* no code can handle this text */
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return -1;
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}
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flags |= cptr->type; /* this works */
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bc->flags |= cptr->type;
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}
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for (cptr = encodings; cptr->verify; cptr++)
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if (cptr->type == (flags & BARCODE_ENCODING_MASK))
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break;
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if (!cptr->verify) {
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bc->error = EINVAL; /* invalid barcode type */
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return -1;
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}
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if (cptr->verify(bc->ascii) != 0) {
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bc->error = EINVAL;
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return -1;
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}
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return cptr->encode(bc);
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}
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/*
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* When multiple output formats are supported, there will
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* be a jumpt table like the one for the types. Now we don't need it
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*/
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extern int Barcode_ps_print(struct Barcode_Item *bc, FILE *f);
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extern int Barcode_pcl_print(struct Barcode_Item *bc, FILE *f);
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/*
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* A function to print a partially decoded string. Meaningful bits for
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* "flags" are the output mask etc. These bits get saved in the data
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* structure.
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*/
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int Barcode_Print(struct Barcode_Item *bc, FILE *f, int flags)
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{
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int validbits = BARCODE_OUTPUT_MASK | BARCODE_NO_ASCII
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| BARCODE_OUT_NOHEADERS;
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/* If any flag is clear in "flags", inherit it from "bc->flags" */
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if (!(flags & BARCODE_OUTPUT_MASK))
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flags |= bc->flags & BARCODE_OUTPUT_MASK;
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if (!(flags & BARCODE_NO_ASCII))
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flags |= bc->flags & BARCODE_NO_ASCII;
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if (!(flags & BARCODE_OUT_NOHEADERS))
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flags |= bc->flags & BARCODE_OUT_NOHEADERS;
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flags = bc->flags = (flags & validbits) | (bc->flags & ~validbits);
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if (bc->flags & BARCODE_OUT_PCL)
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return Barcode_pcl_print(bc, f);
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return Barcode_ps_print(bc, f);
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}
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/*
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* Choose the position
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*/
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int Barcode_Position(struct Barcode_Item *bc, int wid, int hei,
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int xoff, int yoff, double scalef)
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{
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bc->width = wid; bc->height = hei;
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bc->xoff = xoff; bc->yoff = yoff;
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bc->scalef = scalef;
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return 0;
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}
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/*
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* Do it all in one step
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*/
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int Barcode_Encode_and_Print(char *text, FILE *f, int wid, int hei,
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int xoff, int yoff, int flags)
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{
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struct Barcode_Item * bc;
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if (!(bc=Barcode_Create(text))) {
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errno = -ENOMEM;
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return -1;
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}
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if ( Barcode_Position(bc, wid, hei, xoff, yoff, 0.0) < 0
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|| Barcode_Encode(bc, flags) < 0
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|| Barcode_Print(bc, f, flags) < 0) {
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errno = bc->error;
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Barcode_Delete(bc);
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return -1;
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}
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Barcode_Delete(bc);
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return 0;
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}
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/*
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* Return the version
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*/
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int Barcode_Version(char *vptr)
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{
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if (vptr)
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strcpy(vptr, BARCODE_VERSION);
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return BARCODE_VERSION_INT;
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}
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