From 79cca9245429e7325bd1819995fd6b749a45e6a6 Mon Sep 17 00:00:00 2001
From: Christian Hesse <mail@eworm.de>
Date: Wed, 29 May 2013 17:23:18 +0200
Subject: Initial import

---
 .gitignore |   1 +
 Makefile   |  11 +++++++
 cqrlogo.c  | 109 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 121 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 cqrlogo.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9dd2931
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+cqrlogo
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..4c67769
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,11 @@
+# cqrlogo - CGI QR-Code logo for web services
+
+CC	:= gcc
+CFLAGS	+= $(shell pkg-config --cflags --libs gdk-pixbuf-2.0) \
+	   $(shell pkg-config --cflags --libs libqrencode)
+
+all: cqrlogo.c
+	$(CC) $(CFLAGS) -o cqrlogo cqrlogo.c
+
+clean:
+	/bin/rm -f *.o *~ cqrlogo
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:
-- 
cgit v1.2.3-70-g09d2