chia 0.1.15

Utility functions and types used by the Chia blockchain full node
Documentation 
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use serde::de::{SeqAccess, Visitor};
use serde::ser::SerializeTupleStruct;
use serde::{Deserialize, Deserializer, Serialize, Serializer};
use std::fmt;
use std::fmt::Debug;

pub struct ProgramArray(pub Vec<u8>);

impl Debug for ProgramArray {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_tuple("ProgramArray")
            .field(&hex::encode(&self.0))
            .finish()
    }
}
impl<'de> Deserialize<'de> for ProgramArray {
    fn deserialize<D>(deserializer: D) -> Result<Self, <D as Deserializer<'de>>::Error>
    where
        D: Deserializer<'de>,
    {
        let visitor = ProgramArrayVisitor {};
        deserializer.deserialize_tuple(35, visitor)
    }
}

fn size_for_initial_byte<'de, S>(
    initial_byte: u8,
    seq: &mut S,
) -> Result<(usize, Vec<u8>), S::Error>
where
    S: SeqAccess<'de>,
{
    let mut size: usize = 0;
    let mut size_blob: Vec<u8> = Vec::new();
    if initial_byte & 0xc0 == 0x80 {
        size = (initial_byte & 0x7f) as usize;
    }
    if initial_byte & 0xe0 == 0xc0 {
        let size_byte: [u8; 1] = seq.next_element()?.unwrap();
        size = (((initial_byte as usize) & 0x3f) << 8) | (size_byte[0] as usize);
        size_blob = size_byte.into();
    }
    if initial_byte & 0xf0 == 0xe0 {
        let size_byte: [u8; 2] = seq.next_element()?.unwrap();
        size = (((initial_byte as usize) & 0x1f) << 16)
            | ((size_byte[0] as usize) << 8)
            | (size_byte[1] as usize);
        size_blob = size_byte.into();
    }
    Ok((size, size_blob))
}

fn blob_for_size<'de, S>(mut size: usize, seq: &mut S) -> Result<Vec<u8>, S::Error>
where
    S: SeqAccess<'de>,
{
    let mut final_blob: Vec<u8> = Vec::new();
    while size > 32 {
        let b: [u8; 32] = seq.next_element()?.unwrap();
        final_blob.extend_from_slice(&b);
        size -= 32;
    }
    while size > 8 {
        let b: [u8; 8] = seq.next_element()?.unwrap();
        final_blob.extend_from_slice(&b);
        size -= 8;
    }
    while size > 0 {
        let b: [u8; 1] = seq.next_element()?.unwrap();
        final_blob.extend_from_slice(&b);
        size -= 1;
    }
    Ok(final_blob)
}

struct ProgramArrayVisitor {}
impl<'de> Visitor<'de> for ProgramArrayVisitor {
    type Value = ProgramArray;

    fn visit_seq<S>(self, mut seq: S) -> Result<Self::Value, S::Error>
    where
        S: SeqAccess<'de>,
    {
        let initial_byte: u8 = seq.next_element()?.unwrap();
        let mut r = vec![initial_byte];
        if initial_byte == 0xff {
            let left: ProgramArray = seq.next_element()?.unwrap();
            let right: ProgramArray = seq.next_element()?.unwrap();
            r.extend_from_slice(&left.0);
            r.extend_from_slice(&right.0);
            return Ok(ProgramArray(r));
        }
        if initial_byte & 0x80 == 0 {
            return Ok(ProgramArray(vec![initial_byte]));
        }
        let (size, size_blob) = size_for_initial_byte(initial_byte, &mut seq)?;
        let blob = blob_for_size(size, &mut seq)?;

        r.extend_from_slice(&size_blob);
        r.extend_from_slice(&blob);
        let r = ProgramArray(r);
        Ok(r)
    }

    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
        write!(formatter, "blob!!")
    }
}

impl Serialize for ProgramArray {
    fn serialize<S>(&self, serializer: S) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>
    where
        S: Serializer,
    {
        let r = &self.0;
        let len = r.len();
        let mut st = serializer.serialize_tuple_struct("Node", len)?;
        for c in r {
            st.serialize_field(&c)?;
        }
        st.end()
    }
}