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Properly size the destination in flatten_segments #590

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Merged
merged 1 commit into from
Oct 11, 2025
Merged

Properly size the destination in flatten_segments #590

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6 changes: 5 additions & 1 deletion capnp/src/serialize.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -536,7 +536,7 @@ where

#[cfg(feature = "alloc")]
fn flatten_segments<R: message::ReaderSegments + ?Sized>(segments: &R) -> alloc::vec::Vec<u8> {
let word_count = compute_serialized_size(segments);
let word_count = compute_serialized_size(segments) * BYTES_PER_WORD;
let segment_count = segments.len();
let table_size = segment_count / 2 + 1;
let mut result = alloc::vec::Vec::with_capacity(word_count);
Expand All @@ -549,6 +549,10 @@ fn flatten_segments<R: message::ReaderSegments + ?Sized>(segments: &R) -> alloc:
let segment = segments.get_segment(i as u32).unwrap();
result.extend(segment);
}
debug_assert!(
result.capacity() == word_count,
"unexpected result capacity growth"
);
result
}

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