add OTA support for culfw-based devices

[hmcfgusb] / util.c

diff --git a/util.c b/util.c
new file mode 100644 (file)
index 0000000..00ecb7e
--- /dev/null
+++ b/util.c
@@ -0,0 +1,57 @@
+/* utility functions
+ *
+ * Copyright (c) 2014 Michael Gernoth <michael@gernoth.net>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <inttypes.h>
+
+uint8_t ascii_to_nibble(uint8_t a)
+{
+       uint8_t c = 0x00;
+
+       if ((a >= '0') && (a <= '9')) {
+               c = a - '0';
+       } else if ((a >= 'A') && (a <= 'F')) {
+               c = (a - 'A') + 10;
+       } else if ((a >= 'a') && (a <= 'f')) {
+               c = (a - 'a') + 10;
+       }
+
+       return c;
+}
+
+int validate_nibble(uint8_t a)
+{
+       if (((a >= '0') && (a <= '9')) ||
+           ((a >= 'A') && (a <= 'F')) ||
+           ((a >= 'a') && (a <= 'f')))
+               return 1;
+
+       return 0;
+}
+
+char nibble_to_ascii(uint8_t n)
+{
+       const uint8_t nibble[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+               'A', 'B', 'C', 'D', 'E', 'F'};
+
+       return nibble[n];
+}