bitcoind-cache 0.1.1

Alternative storage for bitcoind block data
Documentation 
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pub fn to_vec(hex: &str) -> Option<Vec<u8>> {
    let mut out = Vec::with_capacity(hex.len() / 2);

    let mut b = 0;
    for (idx, c) in hex.as_bytes().iter().enumerate() {
        b <<= 4;
        match *c {
            b'A'..=b'F' => b |= c - b'A' + 10,
            b'a'..=b'f' => b |= c - b'a' + 10,
            b'0'..=b'9' => b |= c - b'0',
            _ => return None,
        }
        if (idx & 1) == 1 {
            out.push(b);
            b = 0;
        }
    }
    Some(out)
}

#[inline]
pub fn hex_str(value: &[u8]) -> String {
    let mut res = String::with_capacity(64);
    for v in value {
        res += &format!("{:02x}", v);
    }
    res
}