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
|
/*
* (C) 2013 by Christian Hesse <mail@eworm.de>
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <regex.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <qrencode.h>
#include "config.h"
GdkPixbuf * encode_qrcode (char *text, int scale, int border) {
QRcode *qrcode;
GdkPixbuf *pixbuf, *pixbuf_scaled;
int i, j, k, rowstride, channels;
guchar *pixel;
unsigned char *data;
qrcode = QRcode_encodeData(strlen(text), (unsigned char *)text, 0, QRCODE_LEVEL);
if (qrcode == NULL)
return NULL;
data = qrcode->data;
pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8,
qrcode->width + border * 2, qrcode->width + border * 2);
pixel = gdk_pixbuf_get_pixels (pixbuf);
rowstride = gdk_pixbuf_get_rowstride (pixbuf);
channels = gdk_pixbuf_get_n_channels (pixbuf);
gdk_pixbuf_fill(pixbuf, 0xffffffff);
for (i = border; i < qrcode->width + border; i++)
for (j = border; j < qrcode->width + border; j++) {
for (k = 0; k < channels; k++)
pixel[i * rowstride + j * channels + k] = !(*data & 0x1) * 0xff;
data++;
}
pixbuf_scaled = gdk_pixbuf_scale_simple (pixbuf,
(qrcode->width + border * 2) * scale,
(qrcode->width + border * 2) * scale,
GDK_INTERP_NEAREST);
QRcode_free(qrcode);
g_object_unref(pixbuf);
return pixbuf_scaled;
}
int main(int argc, char **argv) {
char * http_referer, * server_name, * pattern;
regex_t preg;
regmatch_t pmatch[1];
int rc = 0, referer = 0;
size_t bytes = 0;
GdkPixbuf *pixbuf;
char *match = NULL;
int scale = QRCODE_SCALE, border = QRCODE_BORDER;
gchar *buffer;
gsize size;
/* get query string for later use */
char * query_string = getenv("QUERY_STRING");
/* check if we have environment variables from CGI */
if ((server_name = getenv("SERVER_NAME")) == NULL) {
fprintf(stderr, "This is a CGI executable. Running without a web service is not supported.\n"
"Note that SERVER_NAME needs to be defined, for full features the client has\n"
"to send referer information.\n");
return EXIT_FAILURE;
}
if ((http_referer = getenv("HTTP_REFERER")) == NULL) {
http_referer = server_name;
} else {
/* prepare pattern matching */
pattern = malloc(28 + strlen(server_name));
sprintf(pattern, "^[hH][tT][tT][pP][sS]\\?://%s/", server_name);
if ((rc = regcomp(&preg, pattern, 0)) != 0)
fprintf(stderr, "regcomp() failed, returning nonzero (%d)\n", rc);
/* check if the QR-Code is for the correct server */
if ((referer = regexec(&preg, http_referer, 1, pmatch, 0)) != 0) {
http_referer = malloc(44 + strlen(server_name));
sprintf(http_referer, "This QR Code has been stolen from %s!", server_name);
}
regfree(&preg);
free(pattern);
}
if (query_string ) {
/* do we have a special scale? */
if ((match = strstr(query_string, "scale=")) != NULL)
sscanf(match, "scale=%u", &scale);
/* width of the border? */
if ((match = strstr(query_string, "border=")) != NULL)
sscanf(match, "border=%u", &border);
}
/* initialize type system for glib < 2.36 */
#ifndef GLIB_VERSION_2_36
g_type_init();
#endif
if ((pixbuf = encode_qrcode(http_referer, scale, border)) == NULL) {
if ((pixbuf = encode_qrcode(server_name, scale, border)) == NULL) {
fprintf(stderr, "Could not generate QR-Code.\n");
return EXIT_FAILURE;
}
}
/* print HTTP header */
printf("Content-Type: image/png\n\n");
/* cut http_referer, text in png file may have a max length of 79 chars */
if (strlen(http_referer) > 79) {
if (!referer) {
http_referer = strdup(http_referer);
referer++;
}
sprintf(http_referer + 76, "...");
}
/* print PNG data */
gdk_pixbuf_save_to_buffer (pixbuf, &buffer, &size, "png", NULL,
"compression", "9",
"tEXt::comment", "QR-Code created by cqrlogo - https://github.com/eworm-de/cqrlogo",
"tEXt::referer", http_referer, NULL);
if ((bytes = fwrite (buffer, 1, size, stdout)) != size)
fprintf(stderr, "fwrite() failed, wrote %zu of %zu bytes.\n", bytes, (size_t)size);
if (referer)
free(http_referer);
g_object_unref(pixbuf);
return EXIT_SUCCESS;
}
// vim: set syntax=c:
|