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4147c7b937
Summary: Previously Hash objects could not be assigned to after they were created, since they contained a const member. This makes the data non-const, so a Hash variable can be replaced to contain new contents after it is created. This also adds a default constructor, which zero-initializes the hash. The default constructor makes it possible to declare a Hash with a 0-value at one location, and then set it to the desired value at some later point. Reviewed By: bolinfest Differential Revision: D3406773 fbshipit-source-id: 41e2c7e3ad5bc4d14813be4adaa03866701380f6
69 lines
1.3 KiB
C++
69 lines
1.3 KiB
C++
/*
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* Copyright (c) 2016, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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*/
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#pragma once
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#include <folly/Range.h>
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#include <stdint.h>
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#include <array>
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#include <boost/operators.hpp>
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namespace folly {
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class IOBuf;
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}
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namespace facebook {
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namespace eden {
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/**
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* Immutable 160-bit hash.
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*/
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class Hash : boost::totally_ordered<Hash> {
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public:
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enum { RAW_SIZE = 20 };
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using Storage = std::array<uint8_t, RAW_SIZE>;
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/**
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* Create a 0-initialized hash
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*/
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Hash();
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explicit Hash(Storage bytes);
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explicit Hash(folly::ByteRange bytes);
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/**
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* @param hex is a string of 40 hexadecimal characters.
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*/
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explicit Hash(folly::StringPiece hex);
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/**
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* Compute the SHA1 hash of an IOBuf chain.
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*/
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static Hash sha1(const folly::IOBuf* buf);
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/**
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* Compute the SHA1 hash of a ByteRange
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*/
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static Hash sha1(folly::ByteRange data);
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folly::ByteRange getBytes() const;
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/** @return 40-character [lowercase] hex representation of this hash. */
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std::string toString() const;
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bool operator==(const Hash&) const;
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bool operator<(const Hash&) const;
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private:
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Storage bytes_;
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};
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}
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}
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