add circuitpython code

1 files changed, 61 insertions, 0 deletions

diff --git a/circuitpython/lib/quirc/demo/dthash.h b/circuitpython/lib/quirc/demo/dthash.h
new file mode 100644
index 0000000..431db1e
--- /dev/null
+++ b/circuitpython/lib/quirc/demo/dthash.h
@@ -0,0 +1,61 @@
+/* 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.
+ */
+
+#ifndef DTHASH_H_
+#define DTHASH_H_
+
+#include <stdint.h>
+#include <time.h>
+#include "quirc.h"
+
+/* Detector hash.
+ *
+ * This structure keeps track of codes that have been seen within the
+ * last N seconds, and allows us to print out codes at a reasonable
+ * rate as we see them.
+ */
+#define DTHASH_MAX_CODES	32
+
+struct dthash_code {
+	uint32_t		hash;
+	time_t			when;
+};
+
+struct dthash {
+	struct dthash_code	codes[DTHASH_MAX_CODES];
+	int			count;
+	int			timeout;
+};
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Initialise a detector hash with the given timeout. */
+void dthash_init(struct dthash *d, int timeout);
+
+/* When a code is discovered, this function should be called to see if
+ * it should be printed. The hash will record having seen the code, and
+ * return non-zero if it's the first time we've seen it within the
+ * configured timeout period.
+ */
+int dthash_seen(struct dthash *d, const struct quirc_data *data);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif