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use std::{fmt, io};
use consensus::encode::{self, ReadExt, WriteExt, Decodable, Encodable, VarInt, serialize, deserialize, MAX_VEC_SIZE};
use hashes::hex;
use util::psbt::Error;
#[derive(Debug, PartialEq, Hash, Eq, Clone, Ord, PartialOrd)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
pub struct Key {
pub type_value: u8,
#[cfg_attr(feature = "serde", serde(with = "::serde_utils::hex_bytes"))]
pub key: Vec<u8>,
}
#[derive(Debug, PartialEq)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
pub struct Pair {
pub key: Key,
#[cfg_attr(feature = "serde", serde(with = "::serde_utils::hex_bytes"))]
pub value: Vec<u8>,
}
pub type ProprietaryType = u8;
#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
pub struct ProprietaryKey<Subtype = ProprietaryType> where Subtype: Copy + From<u8> + Into<u8> {
#[cfg_attr(feature = "serde", serde(with = "::serde_utils::hex_bytes"))]
pub prefix: Vec<u8>,
pub subtype: Subtype,
#[cfg_attr(feature = "serde", serde(with = "::serde_utils::hex_bytes"))]
pub key: Vec<u8>,
}
impl fmt::Display for Key {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "type: {:#x}, key: ", self.type_value)?;
hex::format_hex(&self.key[..], f)
}
}
impl Decodable for Key {
fn consensus_decode<D: io::Read>(mut d: D) -> Result<Self, encode::Error> {
let VarInt(byte_size): VarInt = Decodable::consensus_decode(&mut d)?;
if byte_size == 0 {
return Err(Error::NoMorePairs.into());
}
let key_byte_size: u64 = byte_size - 1;
if key_byte_size > MAX_VEC_SIZE as u64 {
return Err(encode::Error::OversizedVectorAllocation {
requested: key_byte_size as usize,
max: MAX_VEC_SIZE,
})
}
let type_value: u8 = Decodable::consensus_decode(&mut d)?;
let mut key = Vec::with_capacity(key_byte_size as usize);
for _ in 0..key_byte_size {
key.push(Decodable::consensus_decode(&mut d)?);
}
Ok(Key {
type_value: type_value,
key: key,
})
}
}
impl Encodable for Key {
fn consensus_encode<S: io::Write>(
&self,
mut s: S,
) -> Result<usize, io::Error> {
let mut len = 0;
len += VarInt((self.key.len() + 1) as u64).consensus_encode(&mut s)?;
len += self.type_value.consensus_encode(&mut s)?;
for key in &self.key {
len += key.consensus_encode(&mut s)?
}
Ok(len)
}
}
impl Encodable for Pair {
fn consensus_encode<S: io::Write>(
&self,
mut s: S,
) -> Result<usize, io::Error> {
let len = self.key.consensus_encode(&mut s)?;
Ok(len + self.value.consensus_encode(s)?)
}
}
impl Decodable for Pair {
fn consensus_decode<D: io::Read>(mut d: D) -> Result<Self, encode::Error> {
Ok(Pair {
key: Decodable::consensus_decode(&mut d)?,
value: Decodable::consensus_decode(d)?,
})
}
}
impl<Subtype> Encodable for ProprietaryKey<Subtype> where Subtype: Copy + From<u8> + Into<u8> {
fn consensus_encode<W: io::Write>(&self, mut e: W) -> Result<usize, io::Error> {
let mut len = self.prefix.consensus_encode(&mut e)? + 1;
e.emit_u8(self.subtype.into())?;
len += e.write(&self.key)?;
Ok(len)
}
}
impl<Subtype> Decodable for ProprietaryKey<Subtype> where Subtype: Copy + From<u8> + Into<u8> {
fn consensus_decode<D: io::Read>(mut d: D) -> Result<Self, encode::Error> {
let prefix = Vec::<u8>::consensus_decode(&mut d)?;
let mut key = vec![];
let subtype = Subtype::from(d.read_u8()?);
d.read_to_end(&mut key)?;
Ok(ProprietaryKey {
prefix,
subtype,
key
})
}
}
impl<Subtype> ProprietaryKey<Subtype> where Subtype: Copy + From<u8> + Into<u8> {
pub fn from_key(key: Key) -> Result<Self, Error> {
if key.type_value != 0xFC {
return Err(Error::InvalidProprietaryKey)
}
Ok(deserialize(&key.key)?)
}
pub fn to_key(&self) -> Key {
Key {
type_value: 0xFC,
key: serialize(self)
}
}
}