60 lines
1.9 KiB
Rust
60 lines
1.9 KiB
Rust
use std::borrow::Cow;
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use std::str;
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use heed::BoxedError;
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pub struct U8StrStrCodec;
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impl<'a> heed::BytesDecode<'a> for U8StrStrCodec {
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type DItem = (u8, &'a str, &'a str);
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fn bytes_decode(bytes: &'a [u8]) -> Result<Self::DItem, BoxedError> {
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let (n, bytes) = bytes.split_first().unwrap();
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let s1_end = bytes.iter().position(|b| *b == 0).unwrap();
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let (s1_bytes, rest) = bytes.split_at(s1_end);
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let s2_bytes = &rest[1..];
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let s1 = str::from_utf8(s1_bytes).ok().unwrap();
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let s2 = str::from_utf8(s2_bytes).ok().unwrap();
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Ok((*n, s1, s2))
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}
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}
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impl<'a> heed::BytesEncode<'a> for U8StrStrCodec {
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type EItem = (u8, &'a str, &'a str);
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fn bytes_encode((n, s1, s2): &Self::EItem) -> Result<Cow<[u8]>, BoxedError> {
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let mut bytes = Vec::with_capacity(s1.len() + s2.len() + 1);
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bytes.push(*n);
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bytes.extend_from_slice(s1.as_bytes());
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bytes.push(0);
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bytes.extend_from_slice(s2.as_bytes());
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Ok(Cow::Owned(bytes))
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}
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}
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pub struct UncheckedU8StrStrCodec;
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impl<'a> heed::BytesDecode<'a> for UncheckedU8StrStrCodec {
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type DItem = (u8, &'a [u8], &'a [u8]);
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fn bytes_decode(bytes: &'a [u8]) -> Result<Self::DItem, BoxedError> {
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let (n, bytes) = bytes.split_first().unwrap();
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let s1_end = bytes.iter().position(|b| *b == 0).unwrap();
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let (s1_bytes, rest) = bytes.split_at(s1_end);
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let s2_bytes = &rest[1..];
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Ok((*n, s1_bytes, s2_bytes))
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}
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}
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impl<'a> heed::BytesEncode<'a> for UncheckedU8StrStrCodec {
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type EItem = (u8, &'a [u8], &'a [u8]);
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fn bytes_encode((n, s1, s2): &Self::EItem) -> Result<Cow<[u8]>, BoxedError> {
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let mut bytes = Vec::with_capacity(s1.len() + s2.len() + 1);
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bytes.push(*n);
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bytes.extend_from_slice(s1);
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bytes.push(0);
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bytes.extend_from_slice(s2);
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Ok(Cow::Owned(bytes))
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}
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}
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