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ObjectId.cpp
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ObjectId.cpp
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/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This software may be used and distributed according to the terms of the
* GNU General Public License version 2.
*/
#include "eden/fs/model/ObjectId.h"
#include <folly/Conv.h>
#include <folly/String.h>
#include <folly/io/Cursor.h>
#include <folly/io/IOBuf.h>
#include <folly/ssl/OpenSSLHash.h>
#include <string>
#include "eden/common/utils/Throw.h"
#include "eden/fs/model/Hash.h"
using folly::ByteRange;
using folly::range;
using folly::ssl::OpenSSLHash;
namespace facebook::eden {
std::string ObjectId::asHexString() const {
auto bytes = getBytes();
std::string result;
folly::hexlify(bytes, result);
return result;
}
std::string ObjectId::asString() const {
auto bytes = getBytes();
return std::string(reinterpret_cast<const char*>(bytes.data()), bytes.size());
}
size_t ObjectId::getHashCode() const noexcept {
const char* p = bytes_.data();
size_t n = bytes_.size();
if (UNLIKELY(n < sizeof(uint64_t))) {
size_t rv = 0;
memcpy(&rv, p, n);
return rv;
}
// unaligned load of tail
size_t rv;
size_t incrementSize = sizeof(uint64_t);
memcpy(&rv, p + (n - incrementSize), incrementSize);
for (const char* end = p + (n - incrementSize); p < end; p += incrementSize) {
size_t x;
memcpy(&x, p, incrementSize);
rv ^= x;
}
return rv;
}
ObjectId ObjectId::sha1(const folly::IOBuf& buf) {
Hash20::Storage hashBytes;
OpenSSLHash::sha1(range(hashBytes), buf);
return ObjectId{hashBytes};
}
ObjectId ObjectId::sha1(ByteRange data) {
Hash20::Storage hashBytes;
OpenSSLHash::sha1(range(hashBytes), data);
return ObjectId{hashBytes};
}
void ObjectId::throwInvalidArgument(const char* message, size_t number) {
throw_<std::invalid_argument>(message, number);
}
std::ostream& operator<<(std::ostream& os, const ObjectId& hash) {
os << hash.toLogString();
return os;
}
} // namespace facebook::eden