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use std::collections::HashMap;
use std::{convert::TryInto, vec::Vec};
use failure::Error;
use log::trace;
use crate::Deserialize;
use crate::Serialize;
use crate::primitive::Variant;
use crate::util;
/// VariantMaps are represented as a HashMap with String as key and Variant as value
///
/// They are serialized as the amount of keys as an i32 then for each entry a String and a Variant.
pub type VariantMap = HashMap<String, Variant>;
impl Serialize for VariantMap {
fn serialize<'a>(&'a self) -> Result<Vec<u8>, Error> {
let mut res: Vec<u8> = Vec::new();
for (k, v) in self {
res.extend(k.serialize()?);
res.extend(v.serialize()?);
}
let len: i32 = self.len().try_into()?;
util::insert_bytes(0, &mut res, &mut len.to_be_bytes());
return Ok(res);
}
}
impl Deserialize for VariantMap {
fn parse(b: &[u8]) -> Result<(usize, Self), Error> {
let (_, len) = i32::parse(&b[0..4])?;
trace!(target: "primitive::VariantMap", "Parsing VariantMap with {:?} elements", len);
let mut pos: usize = 4;
let mut map = VariantMap::new();
for _ in 0..len {
trace!(target: "primitive::VariantMap", "Parsing entry name");
let (nlen, name) = String::parse(&b[pos..])?;
pos += nlen;
trace!(target: "primitive::VariantMap", "Parsing entry: {:?} with len {:?}", name, &b[(pos)..(pos + 4)]);
let (vlen, value) = Variant::parse(&b[(pos)..])?;
pos += vlen;
map.insert(name, value);
}
return Ok((pos, map));
}
}
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