amended sleeptracker structure

Thanks to Lee, the inventor of sleeptracker for disclosing missing piece of
information.

Signed-off-by: Michael Krelin <hacker@klever.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/st-decode.cc b/lib/st-decode.cc
index f8459ac..0fb41de 100644
--- a/lib/st-decode.cc
+++ b/lib/st-decode.cc
@@ -1,75 +1,75 @@
 #include <stdexcept>
 #include <numeric>
 #include <napkin/exception.h>
 #include <napkin/st/decode.h>
 
 namespace napkin {
     namespace sleeptracker {
 	using std::invalid_argument;
 	using std::runtime_error;
 
 	struct st_time_t {
 	    uint8_t hour;
 	    uint8_t min;
 	};
 	struct st_date_t {
 	    uint8_t month;
 	    uint8_t day;
+	    uint8_t dow;
 	};
 	struct st_fulltime_t {
 	    uint8_t hour;
 	    uint8_t min;
 	    uint8_t sec;
 	};
 	struct st_data_header_t {
 	    char magic;
 	    st_date_t today;
-	    uint8_t unknown;
 	    uint8_t window;
 	    st_time_t to_bed;
 	    st_time_t alarm;
 	    uint8_t nawakes;
 	};
 	struct st_data_footer_t {
 	    uint16_t data_a;
 	    uint8_t checksum;
 	    uint8_t eof_mark;
 	};
 
 	static void back_a_day(struct tm& t) {
 	    time_t ts = mktime(&t);
 	    if(ts==(time_t)-1)
 		throw exception_st_data("failed to make up time to step back a day");
 	    ts -= 60*60*24;
 	    if(!localtime_r(&ts,&t))
 		throw exception_st_data("failed to localtime_r() while stepping back a day");
 	}
 
 	hypnodata_t& decode(hypnodata_t& rv,const void *data,size_t data_length) {
 	    if(data_length < (sizeof(st_data_header_t)+sizeof(st_data_footer_t)))
 		throw exception_st_data_envelope("not enough sleeptracker data to decode");
 	    st_data_header_t *h = (st_data_header_t*)data;
 	    if(h->magic != 'V')
 		throw exception_st_data_envelope("invalid magic in the data");
 	    st_data_footer_t *f = (st_data_footer_t*)(static_cast<const char *>(data)+data_length-sizeof(st_data_footer_t));
 	    if( (std::accumulate((uint8_t*)&h->today,(uint8_t*)&f->checksum,0)&0xFF) != f->checksum )
 		throw exception_st_data_integrity("checksum mismatch");
 	    st_fulltime_t *aawake = (st_fulltime_t*)&h[1];
 	    if((void*)&aawake[h->nawakes] != (void*)f)
 		throw exception_st_data_envelope("unbelievably screwed up data");
 	    rv.clear();
 	    time_t now = time(0);
 	    struct tm t;
 	    if(!localtime_r(&now,&t))
 		throw exception_st_data("failed to localtime_r()");
 	    t.tm_mon = h->today.month-1;
 	    t.tm_mday = h->today.day;
 	    time_t mkt = mktime(&t);
 	    if(mkt == (time_t)-1)
 		throw exception_st_data("failed to mktime() for a timestamp");
 	    if(mkt > now) {
 		--t.tm_year;
 	    }
 	    struct tm ta;
 	    memmove(&ta,&t,sizeof(ta));
 	    ta.tm_sec = 0;