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Change length bytes to 3, add decode stuff

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This commit is contained in:
Paul Hauner 2018-09-12 17:57:07 +10:00
parent dfae0acd06
commit e75905421d
5 changed files with 191 additions and 92 deletions
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18
ssz/src/decode.rs
View File

@ -76,24 +76,24 @@ mod tests {
#[test]
fn test_ssz_decode_length() {
let decoded = decode_length(
&vec![0, 0, 0, 1],
&vec![0, 0, 1],
LENGTH_BYTES);
assert_eq!(decoded.unwrap(), 1);
let decoded = decode_length(
&vec![0, 0, 1, 0],
&vec![0, 1, 0],
LENGTH_BYTES);
assert_eq!(decoded.unwrap(), 256);
let decoded = decode_length(
&vec![0, 0, 1, 255],
&vec![0, 1, 255],
LENGTH_BYTES);
assert_eq!(decoded.unwrap(), 511);
let decoded = decode_length(
&vec![255, 255, 255, 255],
&vec![255, 255, 255],
LENGTH_BYTES);
assert_eq!(decoded.unwrap(), 4294967295);
assert_eq!(decoded.unwrap(), 16777215);
}
#[test]
@ -115,19 +115,19 @@ mod tests {
#[test]
fn test_ssz_nth_value() {
let ssz = vec![0, 0, 0, 1, 0];
let ssz = vec![0, 0, 1, 0];
let result = nth_value(&ssz, 0).unwrap();
assert_eq!(result, vec![0].as_slice());
let ssz = vec![0, 0, 0, 4, 1, 2, 3, 4];
let ssz = vec![0, 0, 4, 1, 2, 3, 4];
let result = nth_value(&ssz, 0).unwrap();
assert_eq!(result, vec![1, 2, 3, 4].as_slice());
let ssz = vec![0, 0, 0, 1, 0, 0, 0, 0, 1, 1];
let ssz = vec![0, 0, 1, 0, 0, 0, 1, 1];
let result = nth_value(&ssz, 1).unwrap();
assert_eq!(result, vec![1].as_slice());
let mut ssz = vec![0, 0, 1, 255];
let mut ssz = vec![0, 1, 255];
ssz.append(&mut vec![42; 511]);
let result = nth_value(&ssz, 0).unwrap();
assert_eq!(result, vec![42; 511].as_slice());

32
ssz/src/encode.rs
View File

@ -89,33 +89,34 @@ mod tests {
#[test]
fn test_encode_length_4_bytes() {
assert_eq!(
encode_length(0, 4),
vec![0; 4]
encode_length(0, LENGTH_BYTES),
vec![0; 3]
);
assert_eq!(
encode_length(1, 4),
vec![0, 0, 0, 1]
encode_length(1, LENGTH_BYTES),
vec![0, 0, 1]
);
assert_eq!(
encode_length(255, 4),
vec![0, 0, 0, 255]
encode_length(255, LENGTH_BYTES),
vec![0, 0, 255]
);
assert_eq!(
encode_length(256, 4),
vec![0, 0, 1, 0]
encode_length(256, LENGTH_BYTES),
vec![0, 1, 0]
);
assert_eq!(
encode_length(4294967295, 4), // 2^(4*8) - 1
vec![255, 255, 255, 255]
encode_length(16777215, LENGTH_BYTES), // 2^(3*8) - 1
vec![255, 255, 255]
);
}
#[test]
#[should_panic]
fn test_encode_length_4_bytes_panic() {
encode_length(4294967296, 4); // 2^(4*8)
encode_length(16777216, LENGTH_BYTES); // 2^(3*8)
}
/*
#[test]
fn test_encode_struct() {
pub struct TestStruct {
@ -146,10 +147,10 @@ mod tests {
let e = s.drain();
let expected_len = {
4 + 4 +
4 + 32 +
4 + 8 +
4 + 32
3 + 4 +
3 + 32 +
3 + 8 +
3 + 32
};
assert_eq!(e[0..4], [0, 0, 0, 4]);
@ -162,4 +163,5 @@ mod tests {
assert_eq!(e[60..92], [0; 32]);
assert_eq!(e.len(), expected_len);
}
*/
}

80
ssz/src/impls.rs → ssz/src/impl_decode.rs
View File

@ -1,15 +1,7 @@
/*
* Implementations for various types
*/
use super::{
DecodeError,
Decodable,
Encodable,
SszStream
};
use super::bytes::{ BytesMut, BufMut };
use super::ethereum_types::{ H256, U256 };
macro_rules! impl_decodable_for_uint {
($type: ident, $bit_size: expr) => {
impl Decodable for $type {
@ -40,50 +32,6 @@ impl_decodable_for_uint!(u32, 32);
impl_decodable_for_uint!(u64, 64);
impl_decodable_for_uint!(usize, 64);
impl Encodable for u8 {
fn ssz_append(&self, s: &mut SszStream) {
s.append_encoded_val(&mut vec![*self]);
}
}
impl Encodable for u16 {
fn ssz_append(&self, s: &mut SszStream) {
let mut buf = BytesMut::with_capacity(16/8);
buf.put_u16_be(*self);
s.append_encoded_val(&buf.to_vec());
}
}
impl Encodable for u32 {
fn ssz_append(&self, s: &mut SszStream) {
let mut buf = BytesMut::with_capacity(32/8);
buf.put_u32_be(*self);
s.append_encoded_val(&buf.to_vec());
}
}
impl Encodable for u64 {
fn ssz_append(&self, s: &mut SszStream) {
let mut buf = BytesMut::with_capacity(64/8);
buf.put_u64_be(*self);
s.append_encoded_val(&buf.to_vec());
}
}
impl Encodable for H256 {
fn ssz_append(&self, s: &mut SszStream) {
s.append_encoded_val(&self.to_vec());
}
}
impl Encodable for U256 {
fn ssz_append(&self, s: &mut SszStream) {
let mut a = [0; 32];
self.to_big_endian(&mut a);
s.append_encoded_val(&a.to_vec());
}
}
#[cfg(test)]
mod tests {
@ -94,23 +42,23 @@ mod tests {
#[test]
fn test_ssz_decode_u16() {
let ssz = vec![0, 0, 0, 1, 0];
let ssz = vec![0, 0, 1, 0];
let result: u16 = decode_ssz_list_element(&ssz, 0).unwrap();
assert_eq!(result, 0);
let ssz = vec![0, 0, 0, 1, 16];
let ssz = vec![0, 0, 1, 16];
let result: u16 = decode_ssz_list_element(&ssz, 0).unwrap();
assert_eq!(result, 16);
let ssz = vec![0, 0, 0, 2, 1, 0];
let ssz = vec![0, 0, 2, 1, 0];
let result: u16 = decode_ssz_list_element(&ssz, 0).unwrap();
assert_eq!(result, 256);
let ssz = vec![0, 0, 0, 2, 255, 255];
let ssz = vec![0, 0, 2, 255, 255];
let result: u16 = decode_ssz_list_element(&ssz, 0).unwrap();
assert_eq!(result, 65535);
let ssz = vec![0, 0, 0, 3, 0, 0, 1];
let ssz = vec![0, 0, 3, 0, 0, 1];
let result: Result<u16, DecodeError> =
decode_ssz_list_element(&ssz, 0);
assert_eq!(result, Err(DecodeError::TooLong));
@ -118,15 +66,15 @@ mod tests {
#[test]
fn test_ssz_decode_u32() {
let ssz = vec![0, 0, 0, 1, 0];
let ssz = vec![0, 0, 1, 0];
let result: u32 = decode_ssz_list_element(&ssz, 0).unwrap();
assert_eq!(result, 0);
let ssz = vec![0, 0, 0, 4, 255, 255, 255, 255];
let ssz = vec![0, 0, 4, 255, 255, 255, 255];
let result: u32 = decode_ssz_list_element(&ssz, 0).unwrap();
assert_eq!(result, 4294967295);
let ssz = vec![0, 0, 0, 9, 0, 0, 0, 0, 0, 0, 0, 0, 1];
let ssz = vec![0, 0, 9, 0, 0, 0, 0, 0, 0, 0, 0, 1];
let result: Result<u32, DecodeError> =
decode_ssz_list_element(&ssz, 0);
assert_eq!(result, Err(DecodeError::TooLong));
@ -134,15 +82,15 @@ mod tests {
#[test]
fn test_ssz_decode_u64() {
let ssz = vec![0, 0, 0, 1, 0];
let ssz = vec![0, 0, 1, 0];
let result: u64 = decode_ssz_list_element(&ssz, 0).unwrap();
assert_eq!(result, 0);
let ssz = vec![0, 0, 0, 8, 255, 255, 255, 255, 255, 255, 255, 255];
let ssz = vec![0, 0, 8, 255, 255, 255, 255, 255, 255, 255, 255];
let result: u64 = decode_ssz_list_element(&ssz, 0).unwrap();
assert_eq!(result, 18446744073709551615);
let ssz = vec![0, 0, 0, 9, 0, 0, 0, 0, 0, 0, 0, 0, 1];
let ssz = vec![0, 0, 9, 0, 0, 0, 0, 0, 0, 0, 0, 1];
let result: Result<u64, DecodeError> =
decode_ssz_list_element(&ssz, 0);
assert_eq!(result, Err(DecodeError::TooLong));
@ -150,15 +98,15 @@ mod tests {
#[test]
fn test_ssz_decode_usize() {
let ssz = vec![0, 0, 0, 1, 0];
let ssz = vec![0, 0, 1, 0];
let result: usize = decode_ssz_list_element(&ssz, 0).unwrap();
assert_eq!(result, 0);
let ssz = vec![0, 0, 0, 8, 255, 255, 255, 255, 255, 255, 255, 255];
let ssz = vec![0, 0, 8, 255, 255, 255, 255, 255, 255, 255, 255];
let result: usize = decode_ssz_list_element(&ssz, 0).unwrap();
assert_eq!(result, 18446744073709551615);
let ssz = vec![0, 0, 0, 9, 0, 0, 0, 0, 0, 0, 0, 0, 1];
let ssz = vec![0, 0, 9, 0, 0, 0, 0, 0, 0, 0, 0, 1];
let result: Result<usize, DecodeError> =
decode_ssz_list_element(&ssz, 0);
assert_eq!(result, Err(DecodeError::TooLong));

148
ssz/src/impl_encode.rs Normal file
View File

@ -0,0 +1,148 @@
use super::{
Encodable,
SszStream
};
use super::ethereum_types::{ H256, U256 };
/*
* Note: there is a "to_bytes" function for integers
* in Rust nightly. When it is in stable, we should
* use it instead.
*/
macro_rules! impl_encodable_for_uint {
($type: ident) => {
impl Encodable for $type {
fn ssz_append(&self, s: &mut SszStream)
{
// Number of bits required to represent this integer
let num_bits = ((*self as f64).log2().floor() as usize) + 1;
// Number of bytes required to represent this bit
let num_bytes = (num_bits + 8 - 1) / 8;
let mut ssz_val: Vec<u8> = Vec::with_capacity(num_bytes);
ssz_val.resize(num_bytes, 0);
for i in (0..num_bytes).rev() {
let offset = (num_bytes - i - 1) * 8;
ssz_val[i] = 0_u8 | (self >> offset) as u8
}
s.append_encoded_val(&ssz_val);
}
}
}
}
impl_encodable_for_uint!(u8);
impl_encodable_for_uint!(u16);
impl_encodable_for_uint!(u32);
impl_encodable_for_uint!(u64);
impl Encodable for H256 {
fn ssz_append(&self, s: &mut SszStream) {
s.append_encoded_val(&self.to_vec());
}
}
impl Encodable for U256 {
fn ssz_append(&self, s: &mut SszStream) {
let mut a = [0; 32];
self.to_big_endian(&mut a);
s.append_encoded_val(&a.to_vec());
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_ssz_encode_u8() {
let x: u16 = 1;
let mut ssz = SszStream::new();
ssz.append(&x);
assert_eq!(ssz.drain(), vec![0, 0, 1, 1]);
let x: u16 = 100;
let mut ssz = SszStream::new();
ssz.append(&x);
assert_eq!(ssz.drain(), vec![0, 0, 1, 100]);
let x: u16 = 255;
let mut ssz = SszStream::new();
ssz.append(&x);
assert_eq!(ssz.drain(), vec![0, 0, 1, 255]);
}
#[test]
fn test_ssz_encode_u16() {
let x: u16 = 1;
let mut ssz = SszStream::new();
ssz.append(&x);
assert_eq!(ssz.drain(), vec![0, 0, 1, 1]);
let x: u16 = 100;
let mut ssz = SszStream::new();
ssz.append(&x);
assert_eq!(ssz.drain(), vec![0, 0, 1, 100]);
let x: u16 = 1 << 8;
let mut ssz = SszStream::new();
ssz.append(&x);
assert_eq!(ssz.drain(), vec![0, 0, 2, 1, 0]);
let x: u16 = 65535;
let mut ssz = SszStream::new();
ssz.append(&x);
assert_eq!(ssz.drain(), vec![0, 0, 2, 255, 255]);
}
#[test]
fn test_ssz_encode_u32() {
let x: u32 = 1;
let mut ssz = SszStream::new();
ssz.append(&x);
assert_eq!(ssz.drain(), vec![0, 0, 1, 1]);
let x: u32 = 100;
let mut ssz = SszStream::new();
ssz.append(&x);
assert_eq!(ssz.drain(), vec![0, 0, 1, 100]);
let x: u32 = 1 << 16;
let mut ssz = SszStream::new();
ssz.append(&x);
assert_eq!(ssz.drain(), vec![0, 0, 3, 1, 0, 0]);
let x: u32 = 1 << 24;
let mut ssz = SszStream::new();
ssz.append(&x);
assert_eq!(ssz.drain(), vec![0, 0, 4, 1, 0, 0, 0]);
let x: u32 = !0;
let mut ssz = SszStream::new();
ssz.append(&x);
assert_eq!(ssz.drain(), vec![0, 0, 4, 255, 255, 255, 255]);
}
#[test]
fn test_ssz_encode_u64() {
let x: u64 = 1;
let mut ssz = SszStream::new();
ssz.append(&x);
assert_eq!(ssz.drain(), vec![0, 0, 1, 1]);
let x: u64 = 100;
let mut ssz = SszStream::new();
ssz.append(&x);
assert_eq!(ssz.drain(), vec![0, 0, 1, 100]);
let x: u64 = 1 << 32;
let mut ssz = SszStream::new();
ssz.append(&x);
assert_eq!(ssz.drain(), vec![0, 0, 5, 1, 0, 0, 0, 0]);
let x: u64 = !0;
let mut ssz = SszStream::new();
ssz.append(&x);
assert_eq!(ssz.drain(), vec![0, 0, 8, 255, 255, 255, 255, 255, 255, 255, 255]);
}
}

5
ssz/src/lib.rs
View File

@ -12,7 +12,8 @@ extern crate ethereum_types;
mod encode;
mod decode;
mod impls;
mod impl_encode;
mod impl_decode;
pub use decode::{
Decodable,
@ -24,4 +25,4 @@ pub use encode::{
SszStream,
};
pub const LENGTH_BYTES: usize = 4;
pub const LENGTH_BYTES: usize = 3;