bitcoinleveldb-env vs bitcoinleveldb-logtools vs bitcoinleveldb-posixlogger

Rust implementation of LevelDB's Env abstraction for the bitcoinleveldb port, providing environment traits, delegating wrappers, file utilities, and logging helpers closely matching the original C++ API.

Low-level LevelDB-style log utilities for Bitcoin-oriented storage stacks: record type enums, extended record flags, unsafe Slice-based string/number helpers, CRC32C precomputation, and binary slice manipulation.

POSIX-backed logging implementation for bitcoinleveldb-style systems that writes timestamped log lines directly to libc::FILE using two-phase buffering and C-compatible format strings.