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author | Colin Cross <ccross@android.com> | 2022-04-13 02:27:30 +0000 |
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committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | 2022-04-13 02:27:30 +0000 |
commit | 7563023510bf04108a954596ea9393a4c11ac279 (patch) | |
tree | 2ce94d7f0804ccb77d1fa9b2a1bca00eecdff1e2 /third_party/abseil-cpp/absl/random/internal/randen_engine.h | |
parent | f60eaea2240ba9e1c508e8e0c91d39ee9fc47be5 (diff) | |
parent | a9167328fc721c9637f0bcd87525cd23ff5ddac1 (diff) | |
download | webrtc-7563023510bf04108a954596ea9393a4c11ac279.tar.gz |
Merge changes I0ab600cd,I1e74c64a am: 798f3afdf6 am: 2f9c4b2c3b am: a9167328fct_frc_odp_330442040t_frc_odp_330442000t_frc_ase_330444010android13-frc-odp-releaseandroid13-dev
Original change: https://android-review.googlesource.com/c/platform/external/webrtc/+/2062410
Change-Id: I9a35945cfb943544bbb0f4632fef787ea38c1ad1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
Diffstat (limited to 'third_party/abseil-cpp/absl/random/internal/randen_engine.h')
-rw-r--r-- | third_party/abseil-cpp/absl/random/internal/randen_engine.h | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/third_party/abseil-cpp/absl/random/internal/randen_engine.h b/third_party/abseil-cpp/absl/random/internal/randen_engine.h index 6b33731336..372c3ac2bd 100644 --- a/third_party/abseil-cpp/absl/random/internal/randen_engine.h +++ b/third_party/abseil-cpp/absl/random/internal/randen_engine.h @@ -23,6 +23,7 @@ #include <limits> #include <type_traits> +#include "absl/base/internal/endian.h" #include "absl/meta/type_traits.h" #include "absl/random/internal/iostream_state_saver.h" #include "absl/random/internal/randen.h" @@ -76,7 +77,7 @@ class alignas(16) randen_engine { impl_.Generate(state_); } - return state_[next_++]; + return little_endian::ToHost(state_[next_++]); } template <class SeedSequence> @@ -120,6 +121,13 @@ class alignas(16) randen_engine { const size_t requested_entropy = (entropy_size == 0) ? 8u : entropy_size; std::fill(std::begin(buffer) + requested_entropy, std::end(buffer), 0); seq.generate(std::begin(buffer), std::begin(buffer) + requested_entropy); +#ifdef ABSL_IS_BIG_ENDIAN + // Randen expects the seed buffer to be in Little Endian; reverse it on + // Big Endian platforms. + for (sequence_result_type& e : buffer) { + e = absl::little_endian::FromHost(e); + } +#endif // The Randen paper suggests preferentially initializing even-numbered // 128-bit vectors of the randen state (there are 16 such vectors). // The seed data is merged into the state offset by 128-bits, which @@ -181,7 +189,8 @@ class alignas(16) randen_engine { // In the case that `elem` is `uint8_t`, it must be cast to something // larger so that it prints as an integer rather than a character. For // simplicity, apply the cast all circumstances. - os << static_cast<numeric_type>(elem) << os.fill(); + os << static_cast<numeric_type>(little_endian::FromHost(elem)) + << os.fill(); } os << engine.next_; return os; @@ -200,7 +209,7 @@ class alignas(16) randen_engine { // necessary to read a wider type and then cast it to uint8_t. numeric_type value; is >> value; - elem = static_cast<result_type>(value); + elem = little_endian::ToHost(static_cast<result_type>(value)); } is >> next; if (is.fail()) { |