Add time functions, simplify API

[libcontrac.git] / src / utils.c

diff --git a/src/utils.c b/src/utils.c
index 1fbb716..443f2a2 100644 (file)
--- a/src/utils.c
+++ b/src/utils.c
@@ -66,4 +66,32 @@ void base64_decode_base64_to_binary(unsigned char const *input, size_t input_siz
        EVP_DecodeBlock(output, input, size_in);
 }
 
+uint32_t epoch_to_day_number(time_t epoch) {
+       uint32_t day_number;
+
+       // DayNumber <- (Number of Seconds since Epoch) / 60 × 60 × 24
+       day_number = epoch / (60 * 60 * 24);
+
+       return day_number;
+}
+
+uint8_t epoch_to_time_interval_number(time_t epoch) {
+       uint8_t time_interval_number;
+       uint32_t day_number;
+       uint32_t seconds;
+
+       // TimeNumberInterval <- (Seconds Since Start of DayNumber) / 60 × 10
+       day_number = epoch_to_day_number(epoch);
+       seconds = epoch - (day_number * (60 * 60 * 24));
+
+       time_interval_number = seconds / (60 * 10);
+
+       // Falls in interval [0,143]
+       if (time_interval_number > 143) {
+               time_interval_number = 143;
+       }
+
+       return time_interval_number;
+}
+