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/*
 * Created on Mon Aug 02 2021
 *
 * Copyright (c) storycraft. Licensed under the MIT Licence.
 */

use std::io::Cursor;

use byteorder::{LittleEndian, ReadBytesExt};

use crate::secure::{SecureHeader, SecurePacket};

use super::SecureError;

/// Decode data_size and [SecureHeader] into empty [SecurePacket]
pub fn decode_secure_head(buf: &[u8]) -> Result<SecurePacket, SecureError> {
    let data_size = Cursor::new(&buf[..4]).read_u32::<LittleEndian>()?;

    let header = bincode::deserialize::<SecureHeader>(&buf[4..])?;
    Ok(SecurePacket {
        header,
        data: vec![0_u8; (data_size - 16) as usize]
    })
}