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use buffer::CapacityError;
use packer::Packer;
use packer::Unpacker;
use packer;
use snap::Error;
use warn::Warn;
use warn::wrap;
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum Warning {
Packer(packer::Warning),
NonZeroPadding,
DuplicateDelete,
DuplicateUpdate,
UnknownDelete,
DeleteUpdate,
NumUpdatedItems,
}
impl From<packer::Warning> for Warning {
fn from(w: packer::Warning) -> Warning {
Warning::Packer(w)
}
}
pub fn key_to_type_id(key: i32) -> u16 {
((key as u32 >> 16) & 0xffff) as u16
}
pub fn key_to_id(key: i32) -> u16 {
((key as u32) & 0xffff) as u16
}
pub fn key(type_id: u16, id: u16) -> i32 {
(((type_id as u32) << 16) | (id as u32)) as i32
}
#[derive(Clone, Copy, Debug)]
pub struct Item<'a> {
pub type_id: u16,
pub id: u16,
pub data: &'a [i32],
}
impl<'a> Item<'a> {
pub fn from_key(key: i32, data: &[i32]) -> Item {
Item {
type_id: key_to_type_id(key),
id: key_to_id(key),
data: data,
}
}
pub fn key(&self) -> i32 {
key(self.type_id, self.id)
}
}
#[derive(Clone, Copy, Debug)]
pub struct DeltaHeader {
pub num_deleted_items: i32,
pub num_updated_items: i32,
}
impl DeltaHeader {
pub fn decode<W: Warn<Warning>>(warn: &mut W, p: &mut Unpacker)
-> Result<DeltaHeader, Error>
{
let result = DeltaHeader {
num_deleted_items: packer::positive(p.read_int(wrap(warn))?)?,
num_updated_items: packer::positive(p.read_int(wrap(warn))?)?,
};
if p.read_int(wrap(warn))? != 0 {
warn.warn(Warning::NonZeroPadding);
}
Ok(result)
}
pub fn encode<'d, 's>(&self, mut p: Packer<'d, 's>)
-> Result<&'d [u8], CapacityError>
{
p.write_int(self.num_deleted_items)?;
p.write_int(self.num_updated_items)?;
p.write_int(0)?;
Ok(p.written())
}
}
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