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fix: use correct hex capacity for word and digest hex encoding #1675

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fix: use correct hex capacity for word and digest hex encoding #1675

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a976a54
fix: use correct hex capacity for word and digest hex encoding
radik878 Dec 24, 2025
d38975d
reduce hex encoding allocations
radik878 Jan 17, 2026
aa76a92
Merge branch '0xMiden:next' into fix/word-hex-hex-capacity
radik878 Jan 18, 2026
34371db
Delete package-lock.json
radik878 Jan 18, 2026
bfc13ac
add safety comments
radik878 Jan 18, 2026
90ce09b
add safety comments
radik878 Jan 18, 2026
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23 changes: 9 additions & 14 deletions crates/rust-client/src/rpc/domain/digest.rs
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Original file line number Diff line number Diff line change
@@ -1,6 +1,5 @@
use alloc::string::String;
use alloc::vec::Vec;
use core::fmt::{self, Debug, Display, Formatter};
use core::fmt::{self, Debug, Display, Formatter, Write};

use hex::ToHex;
use miden_protocol::note::NoteId;
Expand Down Expand Up @@ -36,21 +35,17 @@ impl ToHex for &proto::primitives::Digest {

impl ToHex for proto::primitives::Digest {
fn encode_hex<T: FromIterator<char>>(&self) -> T {
let mut data: Vec<char> = Vec::with_capacity(Word::SERIALIZED_SIZE);
data.extend(format!("{:016x}", self.d0).chars());
data.extend(format!("{:016x}", self.d1).chars());
data.extend(format!("{:016x}", self.d2).chars());
data.extend(format!("{:016x}", self.d3).chars());
data.into_iter().collect()
let mut data = String::with_capacity(Word::SERIALIZED_SIZE * 2);
write!(&mut data, "{:016x}{:016x}{:016x}{:016x}", self.d0, self.d1, self.d2, self.d3)
.unwrap();
data.chars().collect()
}

fn encode_hex_upper<T: FromIterator<char>>(&self) -> T {
let mut data: Vec<char> = Vec::with_capacity(Word::SERIALIZED_SIZE);
data.extend(format!("{:016X}", self.d0).chars());
data.extend(format!("{:016X}", self.d1).chars());
data.extend(format!("{:016X}", self.d2).chars());
data.extend(format!("{:016X}", self.d3).chars());
data.into_iter().collect()
let mut data = String::with_capacity(Word::SERIALIZED_SIZE * 2);
write!(&mut data, "{:016X}{:016X}{:016X}{:016X}", self.d0, self.d1, self.d2, self.d3)
.unwrap();
data.chars().collect()
}
}

Expand Down
44 changes: 28 additions & 16 deletions crates/rust-client/src/rpc/domain/word.rs
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Original file line number Diff line number Diff line change
@@ -1,15 +1,15 @@
use alloc::{string::String, vec::Vec};
use core::fmt::{self, Display, Formatter};
use alloc::string::String;
use core::fmt::{self, Display, Formatter, Write};

use hex::ToHex;
use miden_protocol::{Felt, StarkField, Word, note::NoteId};
use miden_objects::{Felt, StarkField, Word, note::NoteId};

use crate::rpc::{errors::RpcConversionError, generated::word};

// CONSTANTS
// ================================================================================================

pub const WORD_DATA_SIZE: usize = 32;
pub const WORD_DATA_SIZE: usize = Word::SERIALIZED_SIZE * 2;

// FORMATTING
// ================================================================================================
Expand All @@ -32,21 +32,33 @@ impl ToHex for &word::Word {

impl ToHex for word::Word {
fn encode_hex<T: FromIterator<char>>(&self) -> T {
let mut data: Vec<char> = Vec::with_capacity(WORD_DATA_SIZE);
data.extend(format!("{:016x}", self.w0).chars());
data.extend(format!("{:016x}", self.w1).chars());
data.extend(format!("{:016x}", self.w2).chars());
data.extend(format!("{:016x}", self.w3).chars());
data.into_iter().collect()
let mut data = String::with_capacity(WORD_DATA_SIZE);
write!(
&mut data,
"{:016x}{:016x}{:016x}{:016x}",
self.w0,
self.w1,
self.w2,
self.w3
)
// SAFETY: write! into a String only fails on allocation errors; format string is static.
.unwrap();
data.chars().collect()
}

fn encode_hex_upper<T: FromIterator<char>>(&self) -> T {
let mut data: Vec<char> = Vec::with_capacity(WORD_DATA_SIZE);
data.extend(format!("{:016X}", self.w0).chars());
data.extend(format!("{:016X}", self.w1).chars());
data.extend(format!("{:016X}", self.w2).chars());
data.extend(format!("{:016X}", self.w3).chars());
data.into_iter().collect()
let mut data = String::with_capacity(WORD_DATA_SIZE);
write!(
&mut data,
"{:016X}{:016X}{:016X}{:016X}",
self.w0,
self.w1,
self.w2,
self.w3
)
// SAFETY: write! into a String only fails on allocation errors; format string is static.
.unwrap();
data.chars().collect()
}
}

Expand Down
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