wedb_embed 0.1.2

use crate::key_composer::{KeyComposer, KeyTag, SmallKey};

/// 栈上定长构造 TDigest 元数据键（零堆分配）
#[inline]
pub fn meta(kc: &KeyComposer<'_>, key: &[u8]) -> SmallKey {
  kc.compose_meta_key_stack(KeyTag::TDigestMeta.as_slice(), key)
}

/// 构造 TDigest 数据前缀
#[inline]
pub fn prefix(kc: &KeyComposer<'_>, key: &[u8]) -> Vec<u8> {
  kc.compose_prefix(KeyTag::TDigestData.as_slice(), key)
}

/// 构造 TDigest 元数据前缀
#[inline]
pub fn meta_prefix(kc: &KeyComposer<'_>) -> Vec<u8> {
  kc.compose_meta_prefix(KeyTag::TDigestMeta.as_slice())
}