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Finish implementing Darrens migrate-ssz-little-endian and add wrapper to check for ssz underflow

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This commit is contained in:
Kirk Baird
2019-03-18 18:11:46 +11:00
parent 10efc9a934
commit 9cef6a5814
16 changed files with 114 additions and 73 deletions
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20
eth2/utils/ssz/src/decode.rs
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@@ -13,16 +13,22 @@ pub trait Decodable: Sized {
/// Decode the given bytes for the given type
///
/// The single ssz encoded value will be decoded as the given type at the
/// given index.
pub fn decode_ssz<T>(ssz_bytes: &[u8], index: usize) -> Result<(T, usize), DecodeError>
/// The single ssz encoded value/container/list will be decoded as the given type,
/// by recursively calling `ssz_decode`.
pub fn decode<T>(ssz_bytes: &[u8]) -> Result<(T), DecodeError>
where
T: Decodable,
{
if index >= ssz_bytes.len() {
return Err(DecodeError::TooShort);
let (decoded, i): (T, usize) = match T::ssz_decode(ssz_bytes, 0) {
Err(e) => return Err(e),
Ok(v) => v,
};
if i < ssz_bytes.len() {
return Err(DecodeError::TooLong);
}
T::ssz_decode(ssz_bytes, index)
Ok(decoded)
}
/// Decode a vector (list) of encoded bytes.
@@ -82,7 +88,7 @@ pub fn decode_length(
.take(index + length_bytes)
.skip(index)
{
let offset = (length_bytes - (length_bytes - (i - index))) * 8;
let offset = (i - index) * 8;
len |= (*byte as usize) << offset;
}
Ok(len)