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53 lines
1.3 KiB
Rust
53 lines
1.3 KiB
Rust
//! Small database table utilities and helper functions.
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use crate::{
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table::{Decode, Decompress, Table, TableRow},
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DatabaseError,
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};
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use std::borrow::Cow;
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/// Helper function to decode a `(key, value)` pair.
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pub(crate) fn decoder<'a, T>(
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(k, v): (Cow<'a, [u8]>, Cow<'a, [u8]>),
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) -> Result<TableRow<T>, DatabaseError>
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where
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T: Table,
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T::Key: Decode,
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T::Value: Decompress,
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{
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Ok((
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match k {
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Cow::Borrowed(k) => Decode::decode(k)?,
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Cow::Owned(k) => Decode::decode_owned(k)?,
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},
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match v {
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Cow::Borrowed(v) => Decompress::decompress(v)?,
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Cow::Owned(v) => Decompress::decompress_owned(v)?,
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},
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))
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}
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/// Helper function to decode only a value from a `(key, value)` pair.
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pub(crate) fn decode_value<'a, T>(
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kv: (Cow<'a, [u8]>, Cow<'a, [u8]>),
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) -> Result<T::Value, DatabaseError>
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where
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T: Table,
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{
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Ok(match kv.1 {
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Cow::Borrowed(v) => Decompress::decompress(v)?,
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Cow::Owned(v) => Decompress::decompress_owned(v)?,
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})
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}
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/// Helper function to decode a value. It can be a key or subkey.
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pub(crate) fn decode_one<T>(value: Cow<'_, [u8]>) -> Result<T::Value, DatabaseError>
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where
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T: Table,
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{
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Ok(match value {
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Cow::Borrowed(v) => Decompress::decompress(v)?,
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Cow::Owned(v) => Decompress::decompress_owned(v)?,
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})
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}
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