File: ps.c

package info (click to toggle)
barcode 0.99-3
  • links: PTS, VCS
  • area: main
  • in suites: buster, sid
  • size: 4,648 kB
  • sloc: ansic: 21,507; sh: 11,815; makefile: 24; sed: 16
file content (298 lines) | stat: -rw-r--r-- 9,974 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
/*
 * ps.c -- printing the "partial" bar encoding
 *
 * Copyright (c) 1999 Alessandro Rubini (rubini@gnu.org)
 * Copyright (c) 1999 Prosa Srl. (prosa@prosa.it)
 * Copyright (c) 2010, 2011 Giuseppe Scrivano (gscrivano@gnu.org)
 *
 *   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>

#define SHRINK_AMOUNT 0.15 /* shrink the bars to account for ink spreading */


/*
 * How do the "partial" and "textinfo" strings work?
 *
 * The first char in "partial" tells how much extra space to add to the
 * left of the bars. For EAN-13, it is used to leave space to print the
 * first digit, other codes may have '0' for no-extra-space-needed.
 *
 * The next characters are alternating bars and spaces, as multiples
 * of the base dimension which is 1 unless the code is
 * rescaled. Rescaling is calculated as the ratio from the requested
 * width and the calculated width.  Digits represent bar/space
 * dimensions. Lower-case letters represent those bars that should
 * extend lower than the others: 'a' is equivalent to '1', 'b' is '2' and
 * so on.
 *
 * The "textinfo" string is made up of fields "%lf:%lf:%c" separated by
 * blank space. The first integer is the x position of the character,
 * the second is the font size (before rescaling) and the char item is
 * the charcter to be printed.
 *
 * Both the "partial" and "textinfo" strings may include "-" or "+" as
 * special characters (in "textinfo" the char should be a standalone
 * word).  They state where the text should be printed: below the bars
 * ("-", default) or above the bars. This is used, for example, to
 * print the add-5 and add-2 codes to the right of UPC or EAN codes
 * (the add-5 extension is mostly used in ISBN codes.
 */


int Barcode_ps_print(struct Barcode_Item *bc, FILE *f)
{
    int i, j, barlen, printable=1;
    double f1, f2, fsav=0;
    int mode = '-'; /* text below bars */
    double scalef=1, xpos, x0, y0, yr;
    char *ptr;
    char c;

    if (!bc->partial || !bc->textinfo) {
	bc->error = EINVAL;
	return -1;
    }


    /*
     * Maybe this first part can be made common to several printing back-ends,
     * we'll see how that works when other ouput engines are added
     */

    /* First, calculate barlen */
    barlen = bc->partial[0] - '0';
    for (ptr = bc->partial+1; *ptr; ptr++)
	if (isdigit(*ptr)) 
	    barlen += (*ptr - '0');
	else if (islower(*ptr))
	    barlen += (*ptr - 'a'+1);

    /* The scale factor depends on bar length */
    if (!bc->scalef) {
        if (!bc->width) bc->width = barlen; /* default */
        scalef = bc->scalef = (double)bc->width / (double)barlen;
    }

    /* The width defaults to "just enough" */
    if (!bc->width) bc->width = barlen * scalef +1;

    /* But it can be too small, in this case enlarge and center the area */
    if (bc->width < barlen * scalef) {
        int wid = barlen * scalef + 1;
        bc->xoff -= (wid - bc->width)/2 ;
        bc->width = wid;
        /* Can't extend too far on the left */
        if (bc->xoff < 0) {
            bc->width += -bc->xoff;
            bc->xoff = 0;
        }
    }

    /* The height defaults to 80 points (rescaled) */
    if (!bc->height) bc->height = 80 * scalef;

#if 0
    /* If too small (5 + text), enlarge and center */
    i = 5 + 10 * ((bc->flags & BARCODE_NO_ASCII)==0);
    if (bc->height < i * scalef ) {
        int hei = i * scalef;
        bc->yoff -= (hei-bc->height)/2;
        bc->height = hei;
        if (bc->yoff < 0) {
            bc->height += -bc->yoff;
            bc->yoff = 0;
        }
    }
#else
    /* If too small (5 + text), reduce the scale factor and center */
    i = 5 + 10 * ((bc->flags & BARCODE_NO_ASCII)==0);
    if (bc->height < i * scalef ) {
        double scaleg = ((double)bc->height) / i;
        int wid = bc->width * scaleg / scalef;
        bc->xoff += (bc->width - wid)/2;
        bc->width = wid;
        scalef = scaleg;
    }
#endif

    /*
     * Ok, then deal with actual ps (eps) output
     */

    if (!(bc->flags & BARCODE_OUT_NOHEADERS)) { /* spit a header first */
	if (bc->flags & BARCODE_OUT_EPS) 
	    fprintf(f, "%%!PS-Adobe-2.0 EPSF-1.2\n");
	else
	    fprintf(f, "%%!PS-Adobe-2.0\n");
	fprintf(f, "%%%%Creator: libbarcode\n");
	if (bc->flags & BARCODE_OUT_EPS)  {
	    int bboxw;
	    bboxw=bc->xoff + bc->width + 2* bc->margin;
            if (!(bc->flags & BARCODE_NO_ASCII)) {
                ptr = strrchr(bc->textinfo,' ');
	        /*fprintf(stderr, "bc->textinfo=%s\n",bc->textinfo);*/
	        if (ptr == NULL) {
	            fprintf(stderr,
	                "barcode: last char: impossible data: NULL\n");
	        } else {
	            /*fprintf(stderr, "ptr=%s\n",ptr);*/
                   if (sscanf(ptr, "%lf:%lf:%c", &f1, &f2, &c) != 3) {
	                fprintf(stderr,
	                   "barcode: last char: impossible data: %s\n", ptr);
                   } else {
	                /* Both the backslash and the two parens are special */
	                if (c!='\\' && c!=')' && c!='(') {
	                    f1=bc->xoff + (f1+f2) * scalef + bc->margin;
                           if (f1 > bboxw) bboxw=f1;
	                }
	            }
	        }
	    }
	    fprintf(f, "%%%%BoundingBox: %i %i %i %i\n",
		    bc->xoff,
		    bc->yoff,
		    bboxw,
		    bc->yoff + bc->height + 2* bc->margin);
	/*    fprintf(f, "%%DEBUG: bc->width=%i bc->height=%i bc->margin=%i "
                    "scalef=%6.2f barlen=%6.2f bc->partial=%c\n",
		    bc->width, bc->height, bc->margin,
		    scalef, (double)barlen, (char)bc->partial[0]);
         */
	}
	fprintf(f, "%%%%EndComments\n");
	if (bc->flags & BARCODE_OUT_PS)  {
	    fprintf(f, "%%%%EndProlog\n\n");
	    fprintf(f, "%%%%Page: 1 1\n\n");
	}
    }

    /* Print some informative comments */
    for (i=0; bc->ascii[i]; i++)
	if (bc->ascii[i] < ' ')
	    printable = 0;

    fprintf(f,"%% Printing barcode for \"%s\", scaled %5.2f",
	    printable ? bc->ascii : "<unprintable string>", scalef);
    if (bc->encoding)
	fprintf(f,", encoded using \"%s\"",bc->encoding);
    fprintf(f, "\n");
    fprintf(f,"%% The space/bar succession is represented "
	    "by the following widths (space first):\n"
	    "%% ");
    for (i=0; i<strlen(bc->partial); i++) {
        unsigned char c = bc->partial[i];
	if (isdigit(c)) putc(c, f);
	if (islower(c)) putc(c-'a'+'1', f);
	if (isupper(c)) putc(c-'A'+'1', f);
    }
    /* open array for "forall" */
    fprintf(f, "\n[\n%%  height  xpos   ypos  width"
	         "       height  xpos   ypos  width\n");

    xpos = bc->margin + (bc->partial[0]-'0') * scalef;
    for (ptr = bc->partial+1, i=1; *ptr; ptr++, i++) {
	/* special cases: '+' and '-' */
	if (*ptr == '+' || *ptr == '-') {
	    mode = *ptr; /* don't count it */ i++; continue;
	}
	/* j is the width of this bar/space */
	if (isdigit (*ptr))   j = *ptr-'0';
	else                  j = *ptr-'a'+1;
	if (i%2) { /* bar */
	    x0 = bc->xoff + xpos + (j*scalef)/2;
            y0 = bc->yoff + bc->margin;
            yr = bc->height;
            if (!(bc->flags & BARCODE_NO_ASCII)) { /* leave space for text */
		if (mode == '-') {
		    /* text below bars: 10 points or five points */
		    y0 += (isdigit(*ptr) ? 10 : 5) * scalef;
		    yr -= (isdigit(*ptr) ? 10 : 5) * scalef;
		} else { /* '+' */
		    /* text above bars: 10 or 0 from bottom, and 10 from top */
		    y0 += (isdigit(*ptr) ? 10 : 0) * scalef;
		    yr -= (isdigit(*ptr) ? 20 : 10) * scalef; 
		}
	    }
	    /* Define an array and then use "forall" (Hans Schou) */
            fprintf(f,"   [%5.2f %6.2f %6.2f %5.2f]%s",
                    yr, x0, y0, (j * scalef) - SHRINK_AMOUNT,
		    i%4 == 1 ? "   " : "\n");
	}
	xpos += j * scalef;
    }
    fprintf(f,"\n]\t{ {} forall setlinewidth moveto 0 exch rlineto stroke} "
	    "bind forall\n");

    /* Then, the text */

    mode = '-'; /* reinstantiate default */
    if (!(bc->flags & BARCODE_NO_ASCII)) {
	fprintf(f, "[\n%%   char    xpos   ypos fontsize\n");
        for (ptr = bc->textinfo; ptr; ptr = strchr(ptr, ' ')) {
            while (*ptr == ' ') ptr++;
            if (!*ptr) break;
	    if (*ptr == '+' || *ptr == '-') {
		mode = *ptr; continue;
	    }
            if (sscanf(ptr, "%lf:%lf:%c", &f1, &f2, &c) != 3) {
		fprintf(stderr, "barcode: impossible data: %s\n", ptr);
                continue;
            }

            fprintf(f, "    [(");
	    /* Both the backslash and the two parens are special */
	    if (c=='\\' || c==')' || c=='(')
		fprintf(f, "\\%c) ", c);
	    else
		fprintf(f, "%c)  ", c);
            fprintf(f, "%6.2f %6.2f %5.2f]\n", 
                    bc->xoff + f1 * scalef + bc->margin,
		    mode == '-'
                       ? (double)bc->yoff + bc->margin
		       : (double)bc->yoff + bc->margin+bc->height - 8*scalef,
		    fsav == f2 ? 0.0 : f2 * scalef);
	    fsav = f2;
	}
	fprintf(f,"]   { {} forall dup 0.00 ne {\n\t"
		"/Helvetica findfont exch scalefont setfont\n"
		"    } {pop} ifelse\n"
		"    moveto show} bind forall\n");
	

    }

    fprintf(f,"%% End barcode for \"%s\"\n\n",
	    printable ? bc->ascii : "<unprintable string>");

    if (!(bc->flags & BARCODE_OUT_NOHEADERS)) {
	if (bc->flags & BARCODE_OUT_PS)  {
	    fprintf(f,"showpage\n");
	    fprintf(f, "%%%%Trailer\n\n");
	}
    }
    return 0;
}