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-rw-r--r--cqrlogo.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/cqrlogo.c b/cqrlogo.c
new file mode 100644
index 0000000..54135bd
--- /dev/null
+++ b/cqrlogo.c
@@ -0,0 +1,109 @@
+/*
+ * (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.
+ *
+ * This is an example code skeleton provided by vim-skeleton.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <regex.h>
+
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <qrencode.h>
+
+#define QRCODE_SCALE 3
+
+GdkPixbuf * encode_qrcode (char *text) {
+ QRcode *qrcode;
+ GdkPixbuf *pixbuf, *pixbuf_scaled;
+ int i, j, k, rowstride, channels;
+ gchar *pixel;
+ unsigned char *data;
+
+ qrcode = QRcode_encodeData(strlen(text), text, 0, QR_ECLEVEL_L);
+
+ if (qrcode == NULL)
+ return NULL;
+
+ data = qrcode->data;
+
+ pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, qrcode->width + 2, qrcode->width + 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 = 1; i <= qrcode->width; i++)
+ for (j = 1; j <= qrcode->width; 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 + 2) * QRCODE_SCALE,
+ (qrcode->width + 2) * QRCODE_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;
+ size_t nmatch;
+ regmatch_t pmatch[2];
+ int rc;
+
+ GdkPixbuf *pixbuf;
+
+ gchar *buffer;
+ gsize size;
+
+ if ((http_referer = getenv("HTTP_REFERER")) == NULL ||
+ (server_name = getenv("SERVER_NAME")) == NULL) {
+ printf("This is a CGI executable. Running without a web service is not supported.\n"
+ "Note that HTTP_REFERER and SERVER_NAME need to be defined.\n");
+ return EXIT_FAILURE;
+ }
+
+ pattern = malloc(11 + strlen(server_name));
+ sprintf(pattern, "^http://%s/", server_name);
+ if ((rc = regcomp(&preg, pattern, 0)) != 0)
+ printf("regcomp() failed, returning nonzero (%d)\n", rc);
+
+ if ((rc = regexec(&preg, http_referer, nmatch, pmatch, 0)) != 0) {
+ /* stolen... */
+ http_referer = malloc(44 + strlen(server_name));
+ sprintf(http_referer, "This QR Code has been stolen from http://%s/!", server_name);
+ }
+
+ regfree(&preg);
+ free(pattern);
+
+ if (pixbuf = encode_qrcode(http_referer)) {
+ /* print HTTP header */
+ printf("Content-Type: image/png\n\n");
+
+ /* print PNG data */
+ gdk_pixbuf_save_to_buffer (pixbuf, &buffer, &size, "png", NULL, NULL);
+ fwrite (buffer, 1, size, stdout);
+ } else {
+ printf("Error?!\n");
+ }
+
+ if (rc)
+ free(http_referer);
+
+ return EXIT_SUCCESS;
+}
+
+// vim: set syntax=c: