diff options
| -rw-r--r-- | .gitignore | 1 | ||||
| -rw-r--r-- | Makefile | 11 | ||||
| -rw-r--r-- | cqrlogo.c | 109 |
3 files changed, 121 insertions, 0 deletions
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: |