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#[cfg(feature = "std")] use std::collections::{HashMap as Map};
#[cfg(not(feature = "std"))] use alloc::collections::{BTreeMap as Map};
use elastic_array::ElasticArray1024;
#[cfg(feature = "std")]
use common::{BLOCKS_RLP_SWAPPER, SNAPSHOT_RLP_SWAPPER};
use {UntrustedRlp, Compressible, encode, RlpStream};
pub struct InvalidRlpSwapper<'a> {
invalid_to_valid: Map<&'a [u8], &'a [u8]>,
valid_to_invalid: Map<&'a [u8], &'a [u8]>,
}
impl<'a> InvalidRlpSwapper<'a> {
pub fn new(rlps_to_swap: &[&'a [u8]], invalid_rlps: &[&'a [u8]]) -> Self {
if rlps_to_swap.len() > 0x7e {
panic!("Invalid usage, only 127 RLPs can be swappable.");
}
let mut invalid_to_valid = Map::new();
let mut valid_to_invalid = Map::new();
for (&rlp, &invalid) in rlps_to_swap.iter().zip(invalid_rlps.iter()) {
invalid_to_valid.insert(invalid, rlp);
valid_to_invalid.insert(rlp, invalid);
}
InvalidRlpSwapper {
invalid_to_valid: invalid_to_valid,
valid_to_invalid: valid_to_invalid
}
}
fn get_valid(&self, invalid_rlp: &[u8]) -> Option<&[u8]> {
self.invalid_to_valid.get(invalid_rlp).cloned()
}
fn get_invalid(&self, valid_rlp: &[u8]) -> Option<&[u8]> {
self.valid_to_invalid.get(valid_rlp).cloned()
}
}
pub enum RlpType {
Blocks,
Snapshot,
}
fn to_elastic(slice: &[u8]) -> ElasticArray1024<u8> {
let mut out = ElasticArray1024::new();
out.append_slice(slice);
out
}
fn map_rlp<F>(rlp: &UntrustedRlp, f: F) -> Option<ElasticArray1024<u8>> where
F: Fn(&UntrustedRlp) -> Option<ElasticArray1024<u8>> {
match rlp.iter()
.fold((false, RlpStream::new_list(rlp.item_count().unwrap_or(0))),
|(is_some, mut acc), subrlp| {
let new = f(&subrlp);
if let Some(ref insert) = new {
acc.append_raw(&insert[..], 1);
} else {
acc.append_raw(subrlp.as_raw(), 1);
}
(is_some || new.is_some(), acc)
}) {
(true, s) => Some(s.drain()),
_ => None,
}
}
fn simple_compress(rlp: &UntrustedRlp, swapper: &InvalidRlpSwapper) -> ElasticArray1024<u8> {
if rlp.is_data() {
to_elastic(swapper.get_invalid(rlp.as_raw()).unwrap_or_else(|| rlp.as_raw()))
} else {
map_rlp(rlp, |r| Some(simple_compress(r, swapper))).unwrap_or_else(|| to_elastic(rlp.as_raw()))
}
}
fn simple_decompress(rlp: &UntrustedRlp, swapper: &InvalidRlpSwapper) -> ElasticArray1024<u8> {
if rlp.is_data() {
to_elastic(swapper.get_valid(rlp.as_raw()).unwrap_or_else(|| rlp.as_raw()))
} else {
map_rlp(rlp, |r| Some(simple_decompress(r, swapper))).unwrap_or_else(|| to_elastic(rlp.as_raw()))
}
}
fn deep_compress(rlp: &UntrustedRlp, swapper: &InvalidRlpSwapper) -> Option<ElasticArray1024<u8>> {
let simple_swap = ||
swapper.get_invalid(rlp.as_raw()).map(to_elastic);
if rlp.is_data() {
return match rlp.payload_info() {
Ok(ref p) if p.value_len < 70 => simple_swap(),
_ => {
if let Ok(d) = rlp.data() {
let internal_rlp = UntrustedRlp::new(d);
if let Some(new_d) = deep_compress(&internal_rlp, swapper) {
let mut rlp = RlpStream::new_list(2);
rlp.append_raw(&[0x81, 0x7f], 1);
rlp.append_raw(&new_d[..], 1);
return Some(rlp.drain());
}
}
simple_swap()
},
};
}
map_rlp(rlp, |r| deep_compress(r, swapper))
}
fn deep_decompress(rlp: &UntrustedRlp, swapper: &InvalidRlpSwapper) -> Option<ElasticArray1024<u8>> {
let simple_swap = ||
swapper.get_valid(rlp.as_raw()).map(to_elastic);
if rlp.is_data() { return simple_swap(); }
match rlp.item_count().unwrap_or(0) {
2 if rlp.at(0).map(|r| r.as_raw() == &[0x81, 0x7f]).unwrap_or(false) =>
rlp.at(1).ok().map_or(simple_swap(),
|r| deep_decompress(&r, swapper).map(|d| { let v = d.to_vec(); encode(&v) })),
_ => map_rlp(rlp, |r| deep_decompress(r, swapper)),
}
}
#[cfg(feature = "std")]
impl<'a> Compressible for UntrustedRlp<'a> {
type DataType = RlpType;
fn compress(&self, t: RlpType) -> ElasticArray1024<u8> {
match t {
RlpType::Snapshot => simple_compress(self, &SNAPSHOT_RLP_SWAPPER),
RlpType::Blocks => deep_compress(self, &BLOCKS_RLP_SWAPPER).unwrap_or_else(|| to_elastic(self.as_raw())),
}
}
fn decompress(&self, t: RlpType) -> ElasticArray1024<u8> {
match t {
RlpType::Snapshot => simple_decompress(self, &SNAPSHOT_RLP_SWAPPER),
RlpType::Blocks => deep_decompress(self, &BLOCKS_RLP_SWAPPER).unwrap_or_else(|| to_elastic(self.as_raw())),
}
}
}
#[cfg(test)]
mod tests {
use compression::InvalidRlpSwapper;
use {UntrustedRlp, Compressible, RlpType};
#[test]
fn invalid_rlp_swapper() {
let to_swap: &[&[u8]] = &[&[0x83, b'c', b'a', b't'], &[0x83, b'd', b'o', b'g']];
let invalid_rlp: &[&[u8]] = &[&[0x81, 0x00], &[0x81, 0x01]];
let swapper = InvalidRlpSwapper::new(to_swap, invalid_rlp);
assert_eq!(Some(invalid_rlp[0]), swapper.get_invalid(&[0x83, b'c', b'a', b't']));
assert_eq!(None, swapper.get_invalid(&[0x83, b'b', b'a', b't']));
assert_eq!(Some(to_swap[1]), swapper.get_valid(invalid_rlp[1]));
}
#[test]
fn simple_compression() {
let basic_account_rlp = vec![248, 68, 4, 2, 160, 86, 232, 31, 23, 27, 204, 85, 166, 255, 131, 69, 230, 146, 192, 248, 110, 91, 72, 224, 27, 153, 108, 173, 192, 1, 98, 47, 181, 227, 99, 180, 33, 160, 197, 210, 70, 1, 134, 247, 35, 60, 146, 126, 125, 178, 220, 199, 3, 192, 229, 0, 182, 83, 202, 130, 39, 59, 123, 250, 216, 4, 93, 133, 164, 112];
let rlp = UntrustedRlp::new(&basic_account_rlp);
let compressed = rlp.compress(RlpType::Snapshot).to_vec();
assert_eq!(compressed, vec![198, 4, 2, 129, 0, 129, 1]);
let compressed_rlp = UntrustedRlp::new(&compressed);
assert_eq!(compressed_rlp.decompress(RlpType::Snapshot).to_vec(), basic_account_rlp);
}
#[test]
fn data_compression() {
let data_basic_account_rlp = vec![184, 70, 248, 68, 4, 2, 160, 86, 232, 31, 23, 27, 204, 85, 166, 255, 131, 69, 230, 146, 192, 248, 110, 91, 72, 224, 27, 153, 108, 173, 192, 1, 98, 47, 181, 227, 99, 180, 33, 160, 197, 210, 70, 1, 134, 247, 35, 60, 146, 126, 125, 178, 220, 199, 3, 192, 229, 0, 182, 83, 202, 130, 39, 59, 123, 250, 216, 4, 93, 133, 164, 112];
let data_rlp = UntrustedRlp::new(&data_basic_account_rlp);
let compressed = data_rlp.compress(RlpType::Blocks).to_vec();
assert_eq!(compressed, vec![201, 129, 127, 198, 4, 2, 129, 0, 129, 1]);
let compressed_rlp = UntrustedRlp::new(&compressed);
assert_eq!(compressed_rlp.decompress(RlpType::Blocks).to_vec(), data_basic_account_rlp);
}
#[test]
fn nested_list_rlp() {
let nested_basic_account_rlp = vec![228, 4, 226, 2, 160, 86, 232, 31, 23, 27, 204, 85, 166, 255, 131, 69, 230, 146, 192, 248, 110, 91, 72, 224, 27, 153, 108, 173, 192, 1, 98, 47, 181, 227, 99, 180, 33];
let nested_rlp = UntrustedRlp::new(&nested_basic_account_rlp);
let compressed = nested_rlp.compress(RlpType::Blocks).to_vec();
assert_eq!(compressed, vec![197, 4, 195, 2, 129, 0]);
let compressed_rlp = UntrustedRlp::new(&compressed);
assert_eq!(compressed_rlp.decompress(RlpType::Blocks).to_vec(), nested_basic_account_rlp);
let compressed = nested_rlp.compress(RlpType::Snapshot).to_vec();
assert_eq!(compressed, vec![197, 4, 195, 2, 129, 0]);
let compressed_rlp = UntrustedRlp::new(&compressed);
assert_eq!(compressed_rlp.decompress(RlpType::Snapshot).to_vec(), nested_basic_account_rlp);
}
#[test]
fn malformed_rlp() {
let malformed = vec![248, 81, 128, 128, 128, 128, 128, 160, 12, 51, 241, 93, 69, 218, 74, 138, 79, 115, 227, 44, 216, 81, 46, 132, 85, 235, 96, 45, 252, 48, 181, 29, 75, 141, 217, 215, 86, 160, 109, 130, 160, 140, 36, 93, 200, 109, 215, 100, 241, 246, 99, 135, 92, 168, 149, 170, 114, 9, 143, 4, 93, 25, 76, 54, 176, 119, 230, 170, 154, 105, 47, 121, 10, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128];
let malformed_rlp = UntrustedRlp::new(&malformed);
assert_eq!(malformed_rlp.decompress(RlpType::Blocks).to_vec(), malformed);
}
}