temporenc/
date_time.rs

1use std::io::{Read, Write};
2
3use super::*;
4
5/// A Date and Time.
6#[derive(Debug, PartialEq)]
7pub struct DateTime {
8    year: u16,
9    month: u8,
10    day: u8,
11    hour: u8,
12    minute: u8,
13    second: u8,
14}
15
16impl DateTime {
17    #[inline]
18    pub fn new(year: Option<u16>, month: Option<u8>, day: Option<u8>, hour: Option<u8>,
19               minute: Option<u8>, second: Option<u8>) -> Result<DateTime, CreationError> {
20        Ok(DateTime {
21            year: year_num(year)?,
22            month: month_num(month)?,
23            day: day_num(day)?,
24            hour: hour_num(hour)?,
25            minute: minute_num(minute)?,
26            second: second_num(second)?,
27        })
28    }
29}
30
31impl Date for DateTime {
32    fn year(&self) -> Option<u16> {
33        if self.year == YEAR_RAW_NONE {
34            None
35        } else {
36            Some(self.year)
37        }
38    }
39
40    fn month(&self) -> Option<u8> {
41        if self.month == MONTH_RAW_NONE {
42            None
43        } else {
44            Some(self.month + 1)
45        }
46    }
47
48    fn day(&self) -> Option<u8> {
49        if self.day == DAY_RAW_NONE {
50            None
51        } else {
52            Some(self.day + 1)
53        }
54    }
55}
56
57impl Time for DateTime {
58    fn hour(&self) -> Option<u8> {
59        if self.hour == HOUR_RAW_NONE {
60            None
61        } else {
62            Some(self.hour)
63        }
64    }
65
66    fn minute(&self) -> Option<u8> {
67        if self.minute == MINUTE_RAW_NONE {
68            None
69        } else {
70            Some(self.minute)
71        }
72    }
73
74    fn second(&self) -> Option<u8> {
75        if self.second == SECOND_RAW_NONE {
76            None
77        } else {
78            Some(self.second)
79        }
80    }
81}
82
83impl Serializable for DateTime {
84    fn max_serialized_size() -> usize {
85        SERIALIZED_SIZE
86    }
87
88    fn serialized_size(&self) -> usize {
89        SERIALIZED_SIZE
90    }
91
92    fn serialize<W: Write>(&self, writer: &mut W) -> Result<usize, SerializationError> {
93        let b0 = DATE_TIME_TAG | (self.year >> 6) as u8;
94        let b1 = ((self.year << 2) as u8) | (self.month >> 2);
95        let b2 = (self.month << 6) | (self.day << 1) | (self.hour >> 4);
96        let b3 = (self.hour << 4) | (self.minute >> 2);
97        let b4 = (self.minute << 6) | self.second;
98
99        write_array_map_err(&[b0, b1, b2, b3, b4], writer)
100            .map_err(|_| SerializationError::IoError)
101    }
102}
103
104impl Deserializable for DateTime {
105    fn deserialize<R: Read>(reader: &mut R) -> Result<DateTime, DeserializationError> {
106        let mut buf = [0; SERIALIZED_SIZE];
107        read_exact(reader, &mut buf)?;
108
109        let byte0 = buf[0];
110
111        if byte0 & 0b1100_0000 != DATE_TIME_TAG {
112            return Err(DeserializationError::IncorrectTypeTag);
113        }
114
115        // 2-bit tag, 12-bit year, 4-bit month, 5-bit day, 5-bit hour, 6-bit minute, 6-bit second
116        // TTYY YYYY | YYYY YYMM | MMDD DDDH | HHHH MMMM | MMSS SSSS
117
118        let byte1 = buf[1];
119        let mut raw_year = ((byte0 & 0x3F) as u16) << 6;
120        raw_year |= (byte1 >> 2) as u16;
121
122        let byte2 = buf[2];
123        let raw_month = ((byte1 & 0x03) << 2) | (byte2 >> 6);
124
125        let raw_day = (byte2 & 0x3E) >> 1;
126
127        let byte3 = buf[3];
128        let raw_hour = ((byte2 & 0x01) << 4) | (byte3 >> 4);
129
130        let byte4 = buf[4];
131        let raw_minute = ((byte3 & 0x0F) << 2) | (byte4 >> 6);
132
133        let raw_second = byte4 & 0x3F;
134
135        // no need to check year as every possible number is a valid year
136        check_deser_in_range_or_none(raw_month, MONTH_RAW_MIN, MONTH_RAW_MAX, MONTH_RAW_NONE)?;
137        // no need to check day as every possible number is a valid day
138        check_deser_in_range_or_none(raw_hour, HOUR_MIN, HOUR_MAX, HOUR_RAW_NONE)?;
139        check_deser_in_range_or_none(raw_minute, MINUTE_MIN, MINUTE_MAX, MINUTE_RAW_NONE)?;
140        check_deser_in_range_or_none(raw_second, SECOND_MIN, SECOND_MAX, SECOND_RAW_NONE)?;
141
142        Ok(DateTime {
143            year: raw_year,
144            month: raw_month,
145            day: raw_day,
146            hour: raw_hour,
147            minute: raw_minute,
148            second: raw_second,
149        })
150    }
151}
152
153const SERIALIZED_SIZE: usize = 5;
temporenc/date_time.rs

temporenc/
date_time.rs
