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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "qrcode-util.h"
#if HAVE_QRENCODE
#include <qrencode.h>
#include "alloc-util.h"
#include "dlfcn-util.h"
#include "locale-util.h"
#include "terminal-util.h"
#define ANSI_WHITE_ON_BLACK "\033[40;37;1m"
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) {
_cleanup_(dlclosep) void *dl = NULL;
int r;
if (qrcode_dl)
return 0; /* Already loaded */
dl = dlopen("libqrencode.so.4", RTLD_LAZY);
if (!dl)
return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
"libqrcode support is not installed: %s", dlerror());
r = dlsym_many_and_warn(
dl,
LOG_DEBUG,
DLSYM_ARG(QRcode_encodeString),
DLSYM_ARG(QRcode_free),
NULL);
if (r < 0)
return r;
/* Note that we never release the reference here, because there's no real reason to, after all this
* was traditionally a regular shared library dependency which lives forever too. */
qrcode_dl = TAKE_PTR(dl);
return 1;
}
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("\342\226\210", 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("\342\226\210", 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("\342\226\204", output);
else if (b)
fputs("\342\226\200", output);
else
fputs("\342\226\210", output);
}
for (unsigned x = 0; x < 4; x++)
fputs("\342\226\210", 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
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