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fix(checksum): always store xxh3 digests as little-endian for compat

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This commit is contained in:
Marcus Holland-Moritz 2025-08-06 14:15:12 +02:00
parent afd6ec94da
commit 124a9de309
1 changed files with 9 additions and 2 deletions
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11
src/checksum.cpp
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@ -151,16 +151,20 @@ class checksum_evp : public checksum::impl {
struct xxh3_64_policy {
using result_type = XXH64_hash_t;
using canonical_type = XXH64_canonical_t;
static constexpr auto reset = XXH3_64bits_reset;
static constexpr auto update = XXH3_64bits_update;
static constexpr auto digest = XXH3_64bits_digest;
static constexpr auto canonical = XXH64_canonicalFromHash;
};
struct xxh3_128_policy {
using result_type = XXH128_hash_t;
using canonical_type = XXH128_canonical_t;
static constexpr auto reset = XXH3_128bits_reset;
static constexpr auto update = XXH3_128bits_update;
static constexpr auto digest = XXH3_128bits_digest;
static constexpr auto canonical = XXH128_canonicalFromHash;
};
template <typename Policy>
@ -182,9 +186,12 @@ class checksum_xxh3 : public checksum::impl {
if (!state_) {
return false;
}
auto hash = Policy::digest(state_.get());
typename Policy::canonical_type canonical;
Policy::canonical(&canonical, Policy::digest(state_.get()));
state_.reset();
::memcpy(digest, &hash, sizeof(hash));
// compat: we always store the digest in little-endian order :/
std::ranges::reverse(canonical.digest);
::memcpy(digest, &canonical, sizeof(canonical));
return true;
}