Function decode

wasm-pdk/src/lib.rs:230–263

Decode a handle into a typed `Value`; errors on composites (use `Handle::call`).

(h: u32)

/// Decode a handle into a typed `Value`; errors on composites (use `Handle::call`).
pub fn decode(h: u32) -> Result<Value> {
    let mut tag: u32 = 0;
    let mut buf = alloc::vec![0u8; 256];
    loop {
        let r = unsafe {
            edge_decode(h, &mut tag as *mut u32, buf.as_mut_ptr(), buf.len() as u32)
        };
        if r >= 0 {
            if tag == u32::MAX {
                return Err(Error::Type(alloc::string::String::from("value is not a primitive (use Handle::call for composites)")));
            }
            buf.truncate(r as usize);
            return Ok(match tag {
                0 => Value::None,
                1 => Value::Bool(buf[0] != 0),
                2 => {
                    let mut a = [0u8; 16];
                    a.copy_from_slice(&buf[..16]);
                    Value::Int(i128::from_le_bytes(a))
                }
                3 => {
                    let mut a = [0u8; 8];
                    a.copy_from_slice(&buf[..8]);
                    Value::Float(f64::from_le_bytes(a))
                }
                4 => Value::Bytes(buf),
                5 => Value::Raw(buf),
                _ => return Err(Error::Type(alloc::string::String::from("unknown tag"))),
            });
        }
        // Negative = -needed.
        buf.resize((-r) as usize, 0);
    }
}

/// Encode a primitive into a handle.
pub fn encode(v: Value) -> Result<Handle> {