1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179

use crate::deserialize::{self, FromSql};
use crate::mysql::{Mysql, MysqlValue, NumericRepresentation};
use crate::result::Error::DeserializationError;
use crate::sql_types::{BigInt, Binary, Double, Float, Integer, SmallInt, Text};
use std::convert::TryInto;
use std::error::Error;
use std::str::{self, FromStr};

fn decimal_to_integer<T>(bytes: &[u8]) -> deserialize::Result<T>
where
    T: FromStr,
    T::Err: Error + Send + Sync + 'static,
{
    let string = str::from_utf8(bytes)?;
    let mut splited = string.split('.');
    let integer_portion = splited.next().unwrap_or_default();
    let _decimal_portion = splited.next().unwrap_or_default();
    if splited.next().is_some() {
        Err(format!("Invalid decimal format: {:?}", string).into())
    } else {
        Ok(integer_portion.parse()?)
    }
}

fn f32_to_i64(f: f32) -> deserialize::Result<i64> {
    use std::i64;

    if f <= i64::MAX as f32 && f >= i64::MIN as f32 {
        Ok(f.trunc() as i64)
    } else {
        Err(Box::new(DeserializationError(
            "Numeric overflow/underflow occurred".into(),
        )) as _)
    }
}

fn f64_to_i64(f: f64) -> deserialize::Result<i64> {
    use std::i64;

    if f <= i64::MAX as f64 && f >= i64::MIN as f64 {
        Ok(f.trunc() as i64)
    } else {
        Err(Box::new(DeserializationError(
            "Numeric overflow/underflow occurred".into(),
        )) as _)
    }
}

#[cfg(feature = "mysql_backend")]
impl FromSql<SmallInt, Mysql> for i16 {
    fn from_sql(value: MysqlValue<'_>) -> deserialize::Result<Self> {
        match value.numeric_value()? {
            NumericRepresentation::Tiny(x) => Ok(x.into()),
            NumericRepresentation::Small(x) => Ok(x),
            NumericRepresentation::Medium(x) => x.try_into().map_err(|_| {
                Box::new(DeserializationError(
                    "Numeric overflow/underflow occurred".into(),
                )) as _
            }),
            NumericRepresentation::Big(x) => x.try_into().map_err(|_| {
                Box::new(DeserializationError(
                    "Numeric overflow/underflow occured".into(),
                )) as _
            }),
            NumericRepresentation::Float(x) => f32_to_i64(x)?.try_into().map_err(|_| {
                Box::new(DeserializationError(
                    "Numeric overflow/underflow occured".into(),
                )) as _
            }),
            NumericRepresentation::Double(x) => f64_to_i64(x)?.try_into().map_err(|_| {
                Box::new(DeserializationError(
                    "Numeric overflow/underflow occured".into(),
                )) as _
            }),
            NumericRepresentation::Decimal(bytes) => decimal_to_integer(bytes),
        }
    }
}

#[cfg(feature = "mysql_backend")]
impl FromSql<Integer, Mysql> for i32 {
    fn from_sql(value: MysqlValue<'_>) -> deserialize::Result<Self> {
        match value.numeric_value()? {
            NumericRepresentation::Tiny(x) => Ok(x.into()),
            NumericRepresentation::Small(x) => Ok(x.into()),
            NumericRepresentation::Medium(x) => Ok(x),
            NumericRepresentation::Big(x) => x.try_into().map_err(|_| {
                Box::new(DeserializationError(
                    "Numeric overflow/underflow occured".into(),
                )) as _
            }),
            NumericRepresentation::Float(x) => f32_to_i64(x).and_then(|i| {
                i.try_into().map_err(|_| {
                    Box::new(DeserializationError(
                        "Numeric overflow/underflow occured".into(),
                    )) as _
                })
            }),
            NumericRepresentation::Double(x) => f64_to_i64(x).and_then(|i| {
                i.try_into().map_err(|_| {
                    Box::new(DeserializationError(
                        "Numeric overflow/underflow occured".into(),
                    )) as _
                })
            }),
            NumericRepresentation::Decimal(bytes) => decimal_to_integer(bytes),
        }
    }
}

#[cfg(feature = "mysql_backend")]
impl FromSql<BigInt, Mysql> for i64 {
    fn from_sql(value: MysqlValue<'_>) -> deserialize::Result<Self> {
        match value.numeric_value()? {
            NumericRepresentation::Tiny(x) => Ok(x.into()),
            NumericRepresentation::Small(x) => Ok(x.into()),
            NumericRepresentation::Medium(x) => Ok(x.into()),
            NumericRepresentation::Big(x) => Ok(x),
            NumericRepresentation::Float(x) => f32_to_i64(x),
            NumericRepresentation::Double(x) => f64_to_i64(x),
            NumericRepresentation::Decimal(bytes) => decimal_to_integer(bytes),
        }
    }
}

#[cfg(feature = "mysql_backend")]
impl FromSql<Float, Mysql> for f32 {
    fn from_sql(value: MysqlValue<'_>) -> deserialize::Result<Self> {
        match value.numeric_value()? {
            NumericRepresentation::Tiny(x) => Ok(x.into()),
            NumericRepresentation::Small(x) => Ok(x.into()),
            NumericRepresentation::Medium(x) => Ok(x as Self),
            NumericRepresentation::Big(x) => Ok(x as Self),
            NumericRepresentation::Float(x) => Ok(x),
            NumericRepresentation::Double(x) => Ok(x as Self),
            NumericRepresentation::Decimal(bytes) => Ok(str::from_utf8(bytes)?.parse()?),
        }
    }
}

#[cfg(feature = "mysql_backend")]
impl FromSql<Double, Mysql> for f64 {
    fn from_sql(value: MysqlValue<'_>) -> deserialize::Result<Self> {
        match value.numeric_value()? {
            NumericRepresentation::Tiny(x) => Ok(x.into()),
            NumericRepresentation::Small(x) => Ok(x.into()),
            NumericRepresentation::Medium(x) => Ok(x.into()),
            NumericRepresentation::Big(x) => Ok(x as Self),
            NumericRepresentation::Float(x) => Ok(x.into()),
            NumericRepresentation::Double(x) => Ok(x),
            NumericRepresentation::Decimal(bytes) => Ok(str::from_utf8(bytes)?.parse()?),
        }
    }
}

/// The returned pointer is *only* valid for the lifetime to the argument of
/// `from_sql`. This impl is intended for uses where you want to write a new
/// impl in terms of `String`, but don't want to allocate. We have to return a
/// raw pointer instead of a reference with a lifetime due to the structure of
/// `FromSql`
#[cfg(feature = "mysql_backend")]
impl FromSql<Text, Mysql> for *const str {
    fn from_sql(value: MysqlValue<'_>) -> deserialize::Result<Self> {
        let string = str::from_utf8(value.as_bytes())?;
        Ok(string as *const str)
    }
}

/// The returned pointer is *only* valid for the lifetime to the argument of
/// `from_sql`. This impl is intended for uses where you want to write a new
/// impl in terms of `Vec<u8>`, but don't want to allocate. We have to return a
/// raw pointer instead of a reference with a lifetime due to the structure of
/// `FromSql`
#[cfg(feature = "mysql_backend")]
impl FromSql<Binary, Mysql> for *const [u8] {
    fn from_sql(value: MysqlValue<'_>) -> deserialize::Result<Self> {
        Ok(value.as_bytes() as *const [u8])
    }
}