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-rw-r--r--src/journal/journal-qrcode.c138
1 files changed, 138 insertions, 0 deletions
diff --git a/src/journal/journal-qrcode.c b/src/journal/journal-qrcode.c
new file mode 100644
index 0000000000..10a14e4def
--- /dev/null
+++ b/src/journal/journal-qrcode.c
@@ -0,0 +1,138 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2012 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <assert.h>
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+#include <qrencode.h>
+
+#include "journal-qrcode.h"
+
+#define WHITE_ON_BLACK "\033[40;37;1m"
+#define NORMAL "\033[0m"
+
+static void print_border(FILE *output, unsigned width) {
+ unsigned x, y;
+
+ /* Four rows of border */
+ for (y = 0; y < 4; y += 2) {
+ fputs(WHITE_ON_BLACK, output);
+
+ for (x = 0; x < 4 + width + 4; x++)
+ fputs("\342\226\210", output);
+
+ fputs(NORMAL "\n", output);
+ }
+}
+
+int print_qr_code(
+ FILE *output,
+ const void *seed,
+ size_t seed_size,
+ uint64_t start,
+ uint64_t interval,
+ const char *hn,
+ sd_id128_t machine) {
+
+ FILE *f;
+ char *url = NULL;
+ size_t url_size = 0, i;
+ QRcode* qr;
+ unsigned x, y;
+
+ assert(seed);
+ assert(seed_size > 0);
+
+ f = open_memstream(&url, &url_size);
+ if (!f)
+ return -ENOMEM;
+
+ fputs("fss://", f);
+
+ for (i = 0; i < seed_size; i++) {
+ if (i > 0 && i % 3 == 0)
+ fputc('-', f);
+ fprintf(f, "%02x", ((uint8_t*) seed)[i]);
+ }
+
+ fprintf(f, "/%llx-%llx?machine=" SD_ID128_FORMAT_STR,
+ (unsigned long long) start,
+ (unsigned long long) interval,
+ SD_ID128_FORMAT_VAL(machine));
+
+ if (hn)
+ fprintf(f, ";hostname=%s", hn);
+
+ if (ferror(f)) {
+ fclose(f);
+ free(url);
+ return -ENOMEM;
+ }
+
+ fclose(f);
+
+ qr = QRcode_encodeString(url, 0, QR_ECLEVEL_L, QR_MODE_8, 1);
+ free(url);
+
+ if (!qr)
+ return -ENOMEM;
+
+ print_border(output, qr->width);
+
+ for (y = 0; y < (unsigned) qr->width; y += 2) {
+ const uint8_t *row1, *row2;
+
+ row1 = qr->data + qr->width * y;
+ row2 = row1 + qr->width;
+
+ fputs(WHITE_ON_BLACK, output);
+ for (x = 0; x < 4; x++)
+ fputs("\342\226\210", output);
+
+ for (x = 0; x < (unsigned) qr->width; x ++) {
+ bool a, b;
+
+ a = row1[x] & 1;
+ b = (y+1) < (unsigned) qr->width ? (row2[x] & 1) : false;
+
+ if (a && b)
+ fputc(' ', output);
+ else if (a)
+ fputs("\342\226\204", output);
+ else if (b)
+ fputs("\342\226\200", output);
+ else
+ fputs("\342\226\210", output);
+ }
+
+ for (x = 0; x < 4; x++)
+ fputs("\342\226\210", output);
+ fputs(NORMAL "\n", output);
+ }
+
+ print_border(output, qr->width);
+
+ QRcode_free(qr);
+ return 0;
+}