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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
commit | b750101eb236130cf056c675997decbac904cc49 (patch) | |
tree | a5df1a06754bdd014cb975c051c83b01c9a97532 /src/shared/qrcode-util.c | |
parent | Initial commit. (diff) | |
download | systemd-b750101eb236130cf056c675997decbac904cc49.tar.xz systemd-b750101eb236130cf056c675997decbac904cc49.zip |
Adding upstream version 252.22.upstream/252.22upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/shared/qrcode-util.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/src/shared/qrcode-util.c b/src/shared/qrcode-util.c new file mode 100644 index 0000000..4a33c28 --- /dev/null +++ b/src/shared/qrcode-util.c @@ -0,0 +1,119 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include "qrcode-util.h" + +#if HAVE_QRENCODE +#include <qrencode.h> + +#include "dlfcn-util.h" +#include "locale-util.h" +#include "log.h" +#include "strv.h" +#include "terminal-util.h" + +#define ANSI_WHITE_ON_BLACK "\033[40;37;1m" +#define UNICODE_FULL_BLOCK u8"█" +#define UNICODE_LOWER_HALF_BLOCK u8"▄" +#define UNICODE_UPPER_HALF_BLOCK u8"▀" + +static void *qrcode_dl = NULL; + +static QRcode* (*sym_QRcode_encodeString)(const char *string, int version, QRecLevel level, QRencodeMode hint, int casesensitive) = NULL; +static void (*sym_QRcode_free)(QRcode *qrcode) = NULL; + +int dlopen_qrencode(void) { + int r; + + FOREACH_STRING(s, "libqrencode.so.4", "libqrencode.so.3") { + r = dlopen_many_sym_or_warn( + &qrcode_dl, s, LOG_DEBUG, + DLSYM_ARG(QRcode_encodeString), + DLSYM_ARG(QRcode_free)); + if (r >= 0) + break; + } + + return r; +} + +static void print_border(FILE *output, unsigned width) { + /* Four rows of border */ + for (unsigned y = 0; y < 4; y += 2) { + fputs(ANSI_WHITE_ON_BLACK, output); + + for (unsigned x = 0; x < 4 + width + 4; x++) + fputs(UNICODE_FULL_BLOCK, output); + + fputs(ANSI_NORMAL "\n", output); + } +} + +static void write_qrcode(FILE *output, QRcode *qr) { + assert(qr); + + if (!output) + output = stdout; + + print_border(output, qr->width); + + for (unsigned y = 0; y < (unsigned) qr->width; y += 2) { + const uint8_t *row1 = qr->data + qr->width * y; + const uint8_t *row2 = row1 + qr->width; + + fputs(ANSI_WHITE_ON_BLACK, output); + for (unsigned x = 0; x < 4; x++) + fputs(UNICODE_FULL_BLOCK, output); + + for (unsigned 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(UNICODE_LOWER_HALF_BLOCK, output); + else if (b) + fputs(UNICODE_UPPER_HALF_BLOCK, output); + else + fputs(UNICODE_FULL_BLOCK, output); + } + + for (unsigned x = 0; x < 4; x++) + fputs(UNICODE_FULL_BLOCK, output); + fputs(ANSI_NORMAL "\n", output); + } + + print_border(output, qr->width); + fflush(output); +} + +int print_qrcode(FILE *out, const char *header, const char *string) { + QRcode* qr; + int r; + + /* If this is not an UTF-8 system or ANSI colors aren't supported/disabled don't print any QR + * codes */ + if (!is_locale_utf8() || !colors_enabled()) + return -EOPNOTSUPP; + + r = dlopen_qrencode(); + if (r < 0) + return r; + + qr = sym_QRcode_encodeString(string, 0, QR_ECLEVEL_L, QR_MODE_8, 1); + if (!qr) + return -ENOMEM; + + if (header) + fprintf(out, "\n%s:\n\n", header); + + write_qrcode(out, qr); + + fputc('\n', out); + + sym_QRcode_free(qr); + return 0; +} +#endif |