/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include "qrcode-util.h" #if HAVE_QRENCODE #include #include "ansi-color.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 DLSYM_PROTOTYPE(QRcode_encodeString) = NULL; static DLSYM_PROTOTYPE(QRcode_free) = NULL; int dlopen_qrencode(void) { int r; ELF_NOTE_DLOPEN("qrencode", "Support for generating QR codes", ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED, "libqrencode.so.4", "libqrencode.so.3"); 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, unsigned row, unsigned column) { assert(output); assert(width); if (row != UINT_MAX && column != UINT_MAX) { int r, fd; fd = fileno(output); if (fd < 0) return (void)log_debug_errno(errno, "Failed to get file descriptor from the file stream: %m"); r = terminal_set_cursor_position(fd, row, column); if (r < 0) log_warning_errno(r, "Failed to move terminal cursor position, ignoring: %m"); /* 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); r = terminal_set_cursor_position(fd, row + 1, column); if (r < 0) log_warning_errno(r, "Failed to move terminal cursor position, ignoring: %m"); } } else { /* 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, unsigned int row, unsigned int column) { assert(qr); if (!output) output = stdout; print_border(output, qr->width, row, column); if (row != UINT_MAX && column != UINT_MAX) { /* After printing two rows of top border, we need to move the cursor down two rows before starting to print the actual QR code */ int r, fd, move_down = 2; fd = fileno(output); if (fd < 0) return (void)log_debug_errno(errno, "Failed to get file descriptor from the file stream: %m"); r = terminal_set_cursor_position(fd, row + move_down, column); if (r < 0) log_warning_errno(r, "Failed to move terminal cursor position, ignoring: %m"); 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); r = terminal_set_cursor_position(fd, row + move_down, column); if (r < 0) log_warning_errno(r, "Failed to move terminal cursor position, ignoring: %m"); move_down += 1; fputs(ANSI_NORMAL "\n", output); } print_border(output, qr->width, row + move_down, column); } else { 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, row, column); } fflush(output); } int print_qrcode_full(FILE *out, const char *header, const char *string, unsigned row, unsigned column, unsigned tty_width, unsigned tty_height) { QRcode* qr; int r; /* If this is not a 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 (row != UINT_MAX && column != UINT_MAX) { int fd; unsigned qr_code_width, qr_code_height; fd = fileno(out); if (fd < 0) return log_debug_errno(errno, "Failed to get file descriptor from the file stream: %m"); qr_code_width = qr_code_height = qr->width + 8; if (column + qr_code_width > tty_width) column = tty_width - qr_code_width; /* Terminal characters are twice as high as they are wide so it's qr_code_height / 2, * our QR code prints an extra new line, so we have -1 as well */ if (row + qr_code_height > tty_height) row = tty_height - (qr_code_height / 2 ) - 1; if (header) { r = terminal_set_cursor_position(fd, row - 2, tty_width - qr_code_width - 2); if (r < 0) log_warning_errno(r, "Failed to move terminal cursor position, ignoring: %m"); fprintf(out, "%s:\n\n", header); } } else if (header) fprintf(out, "\n%s:\n\n", header); write_qrcode(out, qr, row, column); fputc('\n', out); sym_QRcode_free(qr); return 0; } #endif