diff options
author | Luke Shumaker <lukeshu@sbcglobal.net> | 2016-06-13 11:45:15 -0400 |
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committer | Luke Shumaker <lukeshu@sbcglobal.net> | 2016-06-13 11:45:15 -0400 |
commit | 28282a3f352f1be7a4ff956fbeb0bca37bb8bc64 (patch) | |
tree | 2a4bcd23e614dfc487d48a2b6d8395b9d2437016 /src/grp-journal/libjournal-core/journal-qrcode.c | |
parent | fc18b7fdd1286d96a4cc36b74e4da81c6ad6a326 (diff) |
./move.sh
Diffstat (limited to 'src/grp-journal/libjournal-core/journal-qrcode.c')
-rw-r--r-- | src/grp-journal/libjournal-core/journal-qrcode.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/src/grp-journal/libjournal-core/journal-qrcode.c b/src/grp-journal/libjournal-core/journal-qrcode.c new file mode 100644 index 0000000000..e38730d65c --- /dev/null +++ b/src/grp-journal/libjournal-core/journal-qrcode.c @@ -0,0 +1,135 @@ +/*** + 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 <errno.h> +#include <qrencode.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.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; +} |