use crate::{FromSql, Type};
pub use bytes::BytesMut;
use std::error::Error;
pub fn read_be_i32(buf: &mut &[u8]) -> Result<i32, Box<dyn Error + Sync + Send>> {
if buf.len() < 4 {
return Err("invalid buffer size".into());
}
let mut bytes = [0; 4];
bytes.copy_from_slice(&buf[..4]);
*buf = &buf[4..];
Ok(i32::from_be_bytes(bytes))
}
pub fn read_value<'a, T>(
type_: &Type,
buf: &mut &'a [u8],
) -> Result<T, Box<dyn Error + Sync + Send>>
where
T: FromSql<'a>,
{
let len = read_be_i32(buf)?;
let value = if len < 0 {
None
} else {
if len as usize > buf.len() {
return Err("invalid buffer size".into());
}
let (head, tail) = buf.split_at(len as usize);
*buf = tail;
Some(head)
};
T::from_sql_nullable(type_, value)
}