quirc/lib/quirc.c

/* quirc -- QR-code recognition library
 * Copyright (C) 2010-2012 Daniel Beer <dlbeer@gmail.com>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <stdlib.h>
#include <string.h>
#include "quirc_internal.h"

const char *quirc_version(void)
{
	return "1.0";
}

struct quirc *quirc_new(void)
{
	struct quirc *q = malloc(sizeof(*q));

	if (!q)
		return NULL;

	memset(q, 0, sizeof(*q));
	return q;
}

void quirc_destroy(struct quirc *q)
{
	if (q->image)
		free(q->image);
	if (sizeof(*q->image) != sizeof(*q->pixels))
		free(q->pixels);

	free(q);
}

int quirc_resize(struct quirc *q, int w, int h)
{
	uint8_t *new_image = realloc(q->image, w * h);

	if (!new_image)
		return -1;

	if (sizeof(*q->image) != sizeof(*q->pixels)) {
		size_t new_size = w * h * sizeof(quirc_pixel_t);
		quirc_pixel_t *new_pixels = realloc(q->pixels, new_size);

		if (!new_pixels) {
			free(new_image);
			return -1;
		}

		q->pixels = new_pixels;
	}

	q->image = new_image;
	q->w = w;
	q->h = h;

	return 0;
}

int quirc_count(const struct quirc *q)
{
	return q->num_grids;
}

static const char *const error_table[] = {
	[QUIRC_SUCCESS] = "Success",
	[QUIRC_ERROR_INVALID_GRID_SIZE] = "Invalid grid size",
	[QUIRC_ERROR_INVALID_VERSION] = "Invalid version",
	[QUIRC_ERROR_FORMAT_ECC] = "Format data ECC failure",
	[QUIRC_ERROR_DATA_ECC] = "ECC failure",
	[QUIRC_ERROR_UNKNOWN_DATA_TYPE] = "Unknown data type",
	[QUIRC_ERROR_DATA_OVERFLOW] = "Data overflow",
	[QUIRC_ERROR_DATA_UNDERFLOW] = "Data underflow"
};

const char *quirc_strerror(quirc_decode_error_t err)
{
	if (err >= 0 && err < sizeof(error_table) / sizeof(error_table[0]))
		return error_table[err];

	return "Unknown error";
}