ipfsapi 0.4.0

Crate for interfacing with the IPFS api
Documentation 
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// A small entropy collector.

const P: [u8; 256] = [
    99, 124, 119, 123, 242, 107, 111, 197, 48, 1, 103, 43, 254, 215, 171, 118,
    202, 130, 201, 125, 250, 89, 71, 240, 173, 212, 162, 175, 156, 164, 114,
    192, 183, 253, 147, 38, 54, 63, 247, 204, 52, 165, 229, 241, 113, 216, 49,
    21, 4, 199, 35, 195, 24, 150, 5, 154, 7, 18, 128, 226, 235, 39, 178, 117,
    9, 131, 44, 26, 27, 110, 90, 160, 82, 59, 214, 179, 41, 227, 47, 132, 83,
    209, 0, 237, 32, 252, 177, 91, 106, 203, 190, 57, 74, 76, 88, 207, 208,
    239, 170, 251, 67, 77, 51, 133, 69, 249, 2, 127, 80, 60, 159, 168, 81,
    163, 64, 143, 146, 157, 56, 245, 188, 182, 218, 33, 16, 255, 243, 210,
    205, 12, 19, 236, 95, 151, 68, 23, 196, 167, 126, 61, 100, 93, 25, 115,
    96, 129, 79, 220, 34, 42, 144, 136, 70, 238, 184, 20, 222, 94, 11, 219,
    224, 50, 58, 10, 73, 6, 36, 92, 194, 211, 172, 98, 145, 149, 228, 121,
    231, 200, 55, 109, 141, 213, 78, 169, 108, 86, 244, 234, 101, 122, 174, 8,
    186, 120, 37, 46, 28, 166, 180, 198, 232, 221, 116, 31, 75, 189, 139, 138,
    112, 62, 181, 102, 72, 3, 246, 14, 97, 53, 87, 185, 134, 193, 29, 158,
    225, 248, 152, 17, 105, 217, 142, 148, 155, 30, 135, 233, 206, 85, 40,
    223, 140, 161, 137, 13, 191, 230, 66, 104, 65, 153, 45, 15, 176, 84, 187,
    22,
];

pub struct Sponge<const N: usize> {
    buf: [u8; N],
    shift: usize,
}

impl<const N: usize> Sponge<N> {
    pub const fn new() -> Self {
        Self {
            buf: [0; N],
            shift: 0,
        }
    }

    fn pearson_block(&self, start: u8) -> u8 {
        let mut h = start;

        for i in 1..N {
            let index = (i + self.shift) % N;
            h = P[self.buf[index] as usize ^ h as usize];
        }

        h
    }

    pub fn absorb(&mut self, byte: u8) {
        self.shift += 1;
        if self.shift == N {
            self.shift = 0;
        }
        self.buf[self.shift] = self.pearson_block(byte);
    }

    pub fn squeeze(&mut self) -> u8 {
        for _ in 0..N {
            self.absorb(0);
        }
        self.buf[self.shift]
    }
}

impl<const N: usize> std::io::Write for Sponge<N> {
    fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
        for b in buf {
            self.absorb(*b);
        }

        Ok(buf.len())
    }

    fn flush(&mut self) -> std::io::Result<()> {
        Ok(())
    }
}