mirror of
https://github.com/matrix-construct/construct
synced 2024-07-05 10:08:36 +02:00
125 lines
3.2 KiB
C++
125 lines
3.2 KiB
C++
/*
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* charybdis: 21st Century IRC++d
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*
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* Copyright (C) 2017 Charybdis Development Team
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* Copyright (C) 2017 Jason Volk <jason@zemos.net>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice is present in all copies.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#pragma once
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#define HAVE_IRCD_HASH_H
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namespace ircd
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{
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constexpr size_t hash(const char *const &str, const size_t i = 0);
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constexpr size_t hash(const char16_t *const &str, const size_t i = 0);
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size_t hash(const std::string &str, const size_t i = 0);
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size_t hash(const std::u16string &str, const size_t i = 0);
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size_t hash(const std::string_view &str, const size_t i = 0);
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}
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namespace ircd::crh
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{
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IRCD_EXCEPTION(ircd::error, error)
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struct hash;
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struct sha256;
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}
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namespace ircd
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{
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using crh::hash;
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using crh::sha256;
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}
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struct ircd::crh::hash
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{
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virtual size_t length() const = 0;
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virtual void finalize(const mutable_raw_buffer &) = 0;
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virtual void extract(const mutable_raw_buffer &) const = 0;
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virtual void update(const const_buffer &) = 0;
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// conveniences
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void finalize(const mutable_raw_buffer &) const;
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void operator()(const mutable_raw_buffer &out, const const_buffer &in);
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hash &operator+=(const const_buffer &);
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virtual ~hash() noexcept;
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};
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struct ircd::crh::sha256
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:hash
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{
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struct ctx;
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static constexpr const size_t bytes
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{
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256 / 8
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};
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protected:
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std::unique_ptr<ctx> ctx;
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public:
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size_t length() const override;
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void finalize(const mutable_raw_buffer &) override;
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void extract(const mutable_raw_buffer &) const override;
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void update(const const_buffer &) override;
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sha256(const mutable_raw_buffer &, const const_buffer &);
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sha256();
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~sha256() noexcept;
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};
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inline size_t
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ircd::hash(const std::string_view &str,
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const size_t i)
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{
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return i >= str.size()? 7681ULL : (hash(str, i+1) * 33ULL) ^ str.at(i);
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}
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inline size_t
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ircd::hash(const std::u16string &str,
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const size_t i)
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{
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return i >= str.size()? 7681ULL : (hash(str, i+1) * 33ULL) ^ str.at(i);
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}
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inline size_t
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ircd::hash(const std::string &str,
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const size_t i)
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{
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return i >= str.size()? 7681ULL : (hash(str, i+1) * 33ULL) ^ str.at(i);
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}
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constexpr size_t
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ircd::hash(const char16_t *const &str,
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const size_t i)
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{
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return !str[i]? 7681ULL : (hash(str, i+1) * 33ULL) ^ str[i];
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}
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constexpr size_t
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ircd::hash(const char *const &str,
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const size_t i)
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{
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return !str[i]? 7681ULL : (hash(str, i+1) * 33ULL) ^ str[i];
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}
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