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Copy pathfloat.rs
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81 lines (70 loc) 路 2.21 KB
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use byteorder::{BigEndian, ByteOrder};
use crate::decode::Decode;
use crate::encode::{Encode, IsNull};
use crate::error::BoxDynError;
use crate::postgres::types::numeric::PgNumeric;
use crate::postgres::{
PgArgumentBuffer, PgHasArrayType, PgTypeInfo, PgValueFormat, PgValueRef, Postgres,
};
use crate::types::Type;
impl Type<Postgres> for f32 {
fn type_info() -> PgTypeInfo {
PgTypeInfo::FLOAT4
}
}
impl PgHasArrayType for f32 {
fn array_type_info() -> PgTypeInfo {
PgTypeInfo::FLOAT4_ARRAY
}
}
impl Encode<'_, Postgres> for f32 {
fn encode_by_ref(&self, buf: &mut PgArgumentBuffer) -> IsNull {
buf.extend(&self.to_be_bytes());
IsNull::No
}
}
impl Decode<'_, Postgres> for f32 {
fn decode(value: PgValueRef<'_>) -> Result<Self, BoxDynError> {
Ok(match value.format() {
PgValueFormat::Binary => BigEndian::read_f32(value.as_bytes()?),
PgValueFormat::Text => value.as_str()?.parse()?,
})
}
}
impl Type<Postgres> for f64 {
fn type_info() -> PgTypeInfo {
PgTypeInfo::FLOAT8
}
fn compatible(ty: &PgTypeInfo) -> bool {
*ty == PgTypeInfo::FLOAT4 || *ty == PgTypeInfo::FLOAT8 || *ty == PgTypeInfo::NUMERIC
}
}
impl PgHasArrayType for f64 {
fn array_type_info() -> PgTypeInfo {
PgTypeInfo::FLOAT8_ARRAY
}
}
impl Encode<'_, Postgres> for f64 {
fn encode_by_ref(&self, buf: &mut PgArgumentBuffer) -> IsNull {
buf.extend(&self.to_be_bytes());
IsNull::No
}
}
impl Decode<'_, Postgres> for f64 {
fn decode(value: PgValueRef<'_>) -> Result<Self, BoxDynError> {
Ok(match value.format() {
PgValueFormat::Binary => {
if value.type_info == PgTypeInfo::NUMERIC {
return PgNumeric::decode(value.as_bytes()?)?.try_into();
}
let buf = value.as_bytes()?;
match buf.len() {
8 => f64::from_be_bytes(buf.try_into()?),
4 => f64::from(f32::from_be_bytes(buf.try_into()?)),
_ => return Err("invalid buffer size".into()),
}
}
PgValueFormat::Text => value.as_str()?.parse()?,
})
}
}