Current File : /home/vacivi36/vittasync.vacivitta.com.br/vittasync/node/deps/v8/src/snapshot/snapshot-utils.cc
// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/snapshot/snapshot-utils.h"
#include "src/base/sanitizer/msan.h"
#ifdef V8_USE_ZLIB
#include "third_party/zlib/zlib.h"
#endif
namespace v8 {
namespace internal {
uint32_t Checksum(base::Vector<const uint8_t> payload) {
#ifdef MEMORY_SANITIZER
// Computing the checksum includes padding bytes for objects like strings.
// Mark every object as initialized in the code serializer.
MSAN_MEMORY_IS_INITIALIZED(payload.begin(), payload.length());
#endif // MEMORY_SANITIZER
#ifdef V8_USE_ZLIB
// Priming the adler32 call so it can see what CPU features are available.
adler32(0, nullptr, 0);
return static_cast<uint32_t>(adler32(0, payload.begin(), payload.length()));
#else
// Simple Fletcher-32.
uint32_t sum1 = 0, sum2 = 0;
for (auto data : payload) {
sum1 = (sum1 + data) % 65535;
sum2 = (sum2 + sum1) % 65535;
}
return (sum2 << 16 | sum1);
#endif
}
} // namespace internal
} // namespace v8
Mini Shell