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