// { dg-options "-w" }
const BLOCK_LEN: usize = 64;

const IV: [u32; 8] = [
    0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19,
];

struct ChunkState {
    chaining_value: [u32; 8],
    chunk_counter: u64,
    block: [u8; BLOCK_LEN],
    block_len: u8,
    blocks_compressed: u8,
    flags: u32,
}

impl ChunkState {
    fn new(key_words: [u32; 8], chunk_counter: u64, flags: u32) -> Self {
        Self {
            chaining_value: key_words,
            chunk_counter,
            block: [0; BLOCK_LEN],
            block_len: 0,
            blocks_compressed: 0,
            flags,
        }
    }
}

pub struct Hasher {
    chunk_state: ChunkState,
    key_words: [u32; 8],
    cv_stack: [[u32; 8]; 54], // Space for 54 subtree chaining values:
    cv_stack_len: u8,         // 2^54 * CHUNK_LEN = 2^64
    flags: u32,
}

impl Hasher {
    fn new_internal(key_words: [u32; 8], flags: u32) -> Self {
        Self {
            chunk_state: ChunkState::new(key_words, 0, flags),
            key_words,
            cv_stack: [[0; 8]; 54],
            cv_stack_len: 0,
            flags,
        }
    }

    /// Construct a new `Hasher` for the regular hash function.
    pub fn new() -> Self {
        Self::new_internal(IV, 0)
    }
}