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extern crate owning_ref;
use owning_ref::ArcRef;
use std::io::Write;
use std::sync::Arc;
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct SGData(Vec<ArcRef<Vec<u8>, [u8]>>);
impl SGData {
pub fn empty() -> Self {
SGData::from_many(vec![])
}
pub fn from_single(v: Vec<u8>) -> Self {
SGData::from_many(vec![v])
}
pub fn from_vec(v: Vec<ArcRef<Vec<u8>, [u8]>>) -> Self {
SGData(v)
}
pub fn from_many(mut v: Vec<Vec<u8>>) -> Self {
SGData(
v.drain(..)
.map(|v| ArcRef::new(Arc::new(v)).map(|v| &v[..]))
.collect(),
)
}
pub fn len(&self) -> usize {
self.0.iter().fold(0, |sum, part | sum + part.len())
}
pub fn is_empty(&self) -> bool {
self.len() == 0
}
pub fn as_parts(&self) -> &[ArcRef<Vec<u8>, [u8]>] {
&self.0
}
pub fn as_vec(&self) -> &Vec<ArcRef<Vec<u8>, [u8]>> {
&self.0
}
pub fn as_vec_mut(&mut self) -> &mut Vec<ArcRef<Vec<u8>, [u8]>> {
&mut self.0
}
pub fn push_vec(&mut self, v : Vec<u8>) {
self.0.push(ArcRef::new(Arc::new(v)).map(|v| &v[..]))
}
pub fn push_arcref(&mut self, arcref : ArcRef<Vec<u8>, [u8]>) {
self.0.push(arcref)
}
pub fn to_linear(&self) -> ArcRef<Vec<u8>, [u8]> {
match self.0.len() {
0 => ArcRef::new(Arc::new(vec![])).map(|v| &v[..]),
1 => self.0[0].clone(),
_ => {
let mut v = Vec::with_capacity(self.len());
for sg_part in &self.0 {
v.write_all(sg_part).unwrap();
}
ArcRef::new(Arc::new(v)).map(|v| &v[..])
}
}
}
pub fn to_linear_vec(mut self) -> Vec<u8> {
match self.0.len() {
0 => vec![],
1 => {
let e = self.0.pop().unwrap();
Arc::try_unwrap(e.into_inner())
.unwrap_or_else(|a| a.as_ref().clone())
}
_ => {
let mut v = Vec::with_capacity(self.len());
for sg_part in &self.0 {
v.write_all(sg_part).unwrap();
}
v
}
}
}
}