Initial implementation for image device access and capture

Also added new example: img_capture

libfprint/img.c

@@ -0,0 +1,106 @@
+/*
+ * Image management functions for libfprint
+ * Copyright (C) 2007 Daniel Drake <dsd@gentoo.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <sys/types.h>
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <glib.h>
+
+#include "fp_internal.h"
+
+struct fp_img *fpi_img_new(size_t length)
+{
+	struct fp_img *img = g_malloc(sizeof(*img) + length);
+	memset(img, 0, sizeof(*img));
+	fp_dbg("length=%zd", length);
+	img->length = length;
+	return img;
+}
+
+struct fp_img *fpi_img_new_dims(int width, int height)
+{
+	struct fp_img *img = fpi_img_new(width * height);
+	img->width = width;
+	img->height = height;
+	return img;
+}
+
+gboolean fpi_img_is_sane(struct fp_img *img)
+{
+	/* basic checks */
+	if (!img->length || !img->width || !img->height)
+		return FALSE;
+
+	/* buffer is big enough? */
+	if ((img->length * img->height) < img->length)
+		return FALSE;
+
+	return TRUE;
+}
+
+struct fp_img *fpi_img_resize(struct fp_img *img, size_t newsize)
+{
+	return g_realloc(img, sizeof(*img) + newsize);
+}
+
+API_EXPORTED int fp_img_get_height(struct fp_img *img)
+{
+	return img->height;
+}
+
+API_EXPORTED int fp_img_get_width(struct fp_img *img)
+{
+	return img->width;
+}
+
+API_EXPORTED unsigned char *fp_img_get_data(struct fp_img *img)
+{
+	return img->data;
+}
+
+API_EXPORTED int fp_img_save_to_file(struct fp_img *img, char *path)
+{
+	FILE *fd = fopen(path, "w");
+	size_t write_size = img->width * img->height;
+	int r;
+
+	if (!fd) {
+		fp_dbg("could not open '%s' for writing: %d", path, errno);
+		return -errno;
+	}
+
+	r = fprintf(fd, "P5 %d %d 255\n", img->width, img->height);
+	if (r < 0) {
+		fp_err("pgm header write failed, error %d", r);
+		return r;
+	}
+
+	r = fwrite(img->data, 1, write_size, fd);
+	if (r < write_size) {
+		fp_err("short write (%d)", r);
+		return -EIO;
+	}
+
+	fclose(fd);
+	fp_dbg("written to '%s'", path);
+	return 0;
+}
+