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monero: match varint decoding (#513)

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* monero: match varint decoding

* Fix build and clippy
This commit is contained in:
Justin Berman 2024-01-11 02:15:11 -06:00 committed by GitHub
parent 3aa8007700
commit c507ab9fd6
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 16 additions and 6 deletions
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22
coins/monero/src/serialize.rs
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@ -12,11 +12,21 @@ use curve25519_dalek::{
const VARINT_CONTINUATION_MASK: u8 = 0b1000_0000; const VARINT_CONTINUATION_MASK: u8 = 0b1000_0000;
mod sealed { mod sealed {
pub trait VarInt: TryInto<u64> + TryFrom<u64> + Copy {} pub trait VarInt: TryInto<u64> + TryFrom<u64> + Copy {
impl VarInt for u8 {} const BITS: usize;
impl VarInt for u32 {} }
impl VarInt for u64 {} impl VarInt for u8 {
impl VarInt for usize {} const BITS: usize = 8;
}
impl VarInt for u32 {
const BITS: usize = 32;
}
impl VarInt for u64 {
const BITS: usize = 64;
}
impl VarInt for usize {
const BITS: usize = core::mem::size_of::<usize>() * 8;
}
} }
// This will panic if the VarInt exceeds u64::MAX // This will panic if the VarInt exceeds u64::MAX
@ -102,7 +112,7 @@ pub(crate) fn read_varint<R: Read, U: sealed::VarInt>(r: &mut R) -> io::Result<U
if (bits != 0) && (b == 0) { if (bits != 0) && (b == 0) {
Err(io::Error::other("non-canonical varint"))?; Err(io::Error::other("non-canonical varint"))?;
} }
if ((bits + 7) > 64) && (b >= (1 << (64 - bits))) { if ((bits + 7) >= U::BITS) && (b >= (1 << (U::BITS - bits))) {
Err(io::Error::other("varint overflow"))?; Err(io::Error::other("varint overflow"))?;
} }