c1f8581ec9
Andrei Tchijov pointed out that the discover_device() function is written in a strange way.
144 lines
3.6 KiB
C
144 lines
3.6 KiB
C
/*
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* Example fingerprint verification program, which verifies the right index
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* finger which has been previously enrolled to disk.
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* Copyright (C) 2007 Daniel Drake <dsd@gentoo.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <libfprint/fprint.h>
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struct fp_dscv_dev *discover_device(struct fp_dscv_dev **discovered_devs)
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{
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struct fp_dscv_dev *ddev = discovered_devs[0];
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struct fp_driver *drv;
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if (!ddev)
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return NULL;
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drv = fp_dscv_dev_get_driver(ddev);
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printf("Found device claimed by %s driver\n", fp_driver_get_full_name(drv));
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return ddev;
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}
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int verify(struct fp_dev *dev, struct fp_print_data *data)
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{
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int r;
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do {
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struct fp_img *img = NULL;
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sleep(1);
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printf("\nScan your finger now.\n");
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r = fp_verify_finger_img(dev, data, &img);
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if (img) {
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fp_img_save_to_file(img, "verify.pgm");
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printf("Wrote scanned image to verify.pgm\n");
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fp_img_free(img);
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}
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if (r < 0) {
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printf("verification failed with error %d :(\n", r);
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return r;
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}
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switch (r) {
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case FP_VERIFY_NO_MATCH:
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printf("NO MATCH!\n");
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return 0;
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case FP_VERIFY_MATCH:
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printf("MATCH!\n");
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return 0;
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case FP_VERIFY_RETRY:
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printf("Scan didn't quite work. Please try again.\n");
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break;
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case FP_VERIFY_RETRY_TOO_SHORT:
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printf("Swipe was too short, please try again.\n");
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break;
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case FP_VERIFY_RETRY_CENTER_FINGER:
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printf("Please center your finger on the sensor and try again.\n");
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break;
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case FP_VERIFY_RETRY_REMOVE_FINGER:
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printf("Please remove finger from the sensor and try again.\n");
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break;
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}
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} while (1);
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}
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int main(void)
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{
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int r = 1;
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struct fp_dscv_dev *ddev;
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struct fp_dscv_dev **discovered_devs;
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struct fp_dev *dev;
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struct fp_print_data *data;
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r = fp_init();
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if (r < 0) {
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fprintf(stderr, "Failed to initialize libfprint\n");
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exit(1);
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}
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discovered_devs = fp_discover_devs();
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if (!discovered_devs) {
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fprintf(stderr, "Could not discover devices\n");
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goto out;
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}
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ddev = discover_device(discovered_devs);
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if (!ddev) {
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fprintf(stderr, "No devices detected.\n");
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goto out;
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}
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dev = fp_dev_open(ddev);
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fp_dscv_devs_free(discovered_devs);
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if (!dev) {
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fprintf(stderr, "Could not open device.\n");
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goto out;
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}
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printf("Opened device. Loading previously enrolled right index finger "
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"data...\n");
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r = fp_print_data_load(dev, RIGHT_INDEX, &data);
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if (r != 0) {
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fprintf(stderr, "Failed to load fingerprint, error %d\n", r);
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fprintf(stderr, "Did you remember to enroll your right index finger "
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"first?\n");
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goto out_close;
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}
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printf("Print loaded. Time to verify!\n");
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do {
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char buffer[20];
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verify(dev, data);
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printf("Verify again? [Y/n]? ");
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fgets(buffer, sizeof(buffer), stdin);
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if (buffer[0] != '\n' && buffer[0] != 'y' && buffer[0] != 'Y')
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break;
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} while (1);
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fp_print_data_free(data);
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out_close:
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fp_dev_close(dev);
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out:
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fp_exit();
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return r;
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}
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