108 lines
3.3 KiB
C
108 lines
3.3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include "qrcode-util.h"
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#if HAVE_QRENCODE
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#include <qrencode.h>
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#include "dlfcn-util.h"
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#include "locale-util.h"
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#include "terminal-util.h"
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#define ANSI_WHITE_ON_BLACK "\033[40;37;1m"
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static void print_border(FILE *output, unsigned width) {
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/* Four rows of border */
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for (unsigned y = 0; y < 4; y += 2) {
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fputs(ANSI_WHITE_ON_BLACK, output);
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for (unsigned x = 0; x < 4 + width + 4; x++)
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fputs("\342\226\210", output);
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fputs(ANSI_NORMAL "\n", output);
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}
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}
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static void write_qrcode(FILE *output, QRcode *qr) {
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assert(qr);
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if (!output)
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output = stdout;
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print_border(output, qr->width);
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for (unsigned y = 0; y < (unsigned) qr->width; y += 2) {
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const uint8_t *row1 = qr->data + qr->width * y;
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const uint8_t *row2 = row1 + qr->width;
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fputs(ANSI_WHITE_ON_BLACK, output);
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for (unsigned x = 0; x < 4; x++)
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fputs("\342\226\210", output);
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for (unsigned 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 (unsigned x = 0; x < 4; x++)
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fputs("\342\226\210", output);
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fputs(ANSI_NORMAL "\n", output);
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}
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print_border(output, qr->width);
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fflush(output);
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}
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int print_qrcode(FILE *out, const char *header, const char *string) {
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QRcode* (*sym_QRcode_encodeString)(const char *string, int version, QRecLevel level, QRencodeMode hint, int casesensitive);
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void (*sym_QRcode_free)(QRcode *qrcode);
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_cleanup_(dlclosep) void *dl = NULL;
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QRcode* qr;
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int r;
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/* If this is not an UTF-8 system or ANSI colors aren't supported/disabled don't print any QR
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* codes */
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if (!is_locale_utf8() || !colors_enabled())
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return -EOPNOTSUPP;
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dl = dlopen("libqrencode.so.4", RTLD_LAZY);
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if (!dl)
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return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
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"QRCODE support is not installed: %s", dlerror());
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r = dlsym_many_and_warn(
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dl,
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LOG_DEBUG,
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&sym_QRcode_encodeString, "QRcode_encodeString",
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&sym_QRcode_free, "QRcode_free",
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NULL);
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if (r < 0)
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return r;
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qr = sym_QRcode_encodeString(string, 0, QR_ECLEVEL_L, QR_MODE_8, 0);
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if (!qr)
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return -ENOMEM;
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if (header)
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fprintf(out, "\n%s:\n\n", header);
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write_qrcode(out, qr);
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fputc('\n', out);
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sym_QRcode_free(qr);
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return 0;
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}
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#endif
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