139 lines
3.8 KiB
C
139 lines
3.8 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2012 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <assert.h>
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <qrencode.h>
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#include "journal-qrcode.h"
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#define WHITE_ON_BLACK "\033[40;37;1m"
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#define NORMAL "\033[0m"
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static void print_border(FILE *output, unsigned width) {
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unsigned x, y;
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/* Four rows of border */
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for (y = 0; y < 4; y += 2) {
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fputs(WHITE_ON_BLACK, output);
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for (x = 0; x < 4 + width + 4; x++)
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fputs("\342\226\210", output);
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fputs(NORMAL "\n", output);
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}
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}
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int print_qr_code(
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FILE *output,
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const void *seed,
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size_t seed_size,
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uint64_t start,
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uint64_t interval,
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const char *hn,
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sd_id128_t machine) {
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FILE *f;
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char *url = NULL;
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size_t url_size = 0, i;
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QRcode* qr;
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unsigned x, y;
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assert(seed);
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assert(seed_size > 0);
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f = open_memstream(&url, &url_size);
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if (!f)
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return -ENOMEM;
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fputs("fss://", f);
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for (i = 0; i < seed_size; i++) {
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if (i > 0 && i % 3 == 0)
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fputc('-', f);
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fprintf(f, "%02x", ((uint8_t*) seed)[i]);
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}
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fprintf(f, "/%llx-%llx?machine=" SD_ID128_FORMAT_STR,
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(unsigned long long) start,
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(unsigned long long) interval,
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SD_ID128_FORMAT_VAL(machine));
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if (hn)
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fprintf(f, ";hostname=%s", hn);
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if (ferror(f)) {
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fclose(f);
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free(url);
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return -ENOMEM;
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}
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fclose(f);
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qr = QRcode_encodeString(url, 0, QR_ECLEVEL_L, QR_MODE_8, 1);
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free(url);
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if (!qr)
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return -ENOMEM;
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print_border(output, qr->width);
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for (y = 0; y < (unsigned) qr->width; y += 2) {
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const uint8_t *row1, *row2;
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row1 = qr->data + qr->width * y;
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row2 = row1 + qr->width;
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fputs(WHITE_ON_BLACK, output);
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for (x = 0; x < 4; x++)
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fputs("\342\226\210", output);
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for (x = 0; x < (unsigned) qr->width; x ++) {
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bool a, b;
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a = row1[x] & 1;
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b = (y+1) < (unsigned) qr->width ? (row2[x] & 1) : false;
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if (a && b)
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fputc(' ', output);
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else if (a)
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fputs("\342\226\204", output);
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else if (b)
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fputs("\342\226\200", output);
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else
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fputs("\342\226\210", output);
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}
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for (x = 0; x < 4; x++)
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fputs("\342\226\210", output);
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fputs(NORMAL "\n", output);
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}
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print_border(output, qr->width);
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QRcode_free(qr);
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return 0;
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}
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