This Rust crate is a direct translation of the
hash.h and hash.cc files from the Bitcoin Core
codebase. The code provides a simple hash function
that is used for internal data structures in
LevelDB, which is used as the database backend for
Bitcoin Core.
This crate is part of a direct translation from C++ to Rust of the Bitcoin Core. As such, some of the function bodies may still be in the process of translation. Please note that this system will become testable once the translation process is complete.
HASH: A dummy struct used in a test function.
hash_signed_unsigned_issue(): A test function
that tests the hash() function with various
inputs.
hash(data: *const u8, n: usize, seed: u32) ->
u32: A simple hash function that is used for
internal data structures in LevelDB. The
function takes a pointer to an array of bytes
(data), the number of bytes to hash (n), and
an initial seed value (seed) as inputs, and
returns a 32-bit hash value. The hash function
is similar to MurmurHash, with a fixed m and
r value. The hash function picks up four bytes
at a time until the last remaining bytes are
less than four, and then switches to handle the
remaining bytes using a switch-case statement.
This crate is primarily intended to be used as
a dependency in other crates that require the hash
function for internal data structures in
LevelDB. To use the crate in your Rust project,
add the following line to your Cargo.toml file:
toml
[dependencies]
bitcoinleveldb-hash = "0.1.0"
And then import the crate in your Rust code with:
rust
extern crate bitcoinleveldb_hash;
Once the crate is imported, you can use the
hash() function as follows:
```rust use bitcoinleveldb_hash::hash;
fn main() { let data: [u8; 3] = [0xe2, 0x99, 0xa5]; let seed: u32 = 0xbc9f1d34; let n: usize = data.len(); let h = hash(data.as_ptr(), n, seed); println!("Hash value: {}", h); } ```