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/*-*- 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, "/%"PRIx64"-%"PRIx64"?machine=" SD_ID128_FORMAT_STR,
start,
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;
}
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