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Diffstat (limited to '')
-rw-r--r-- | src/hasher.hh | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/src/hasher.hh b/src/hasher.hh new file mode 100644 index 0000000..075f726 --- /dev/null +++ b/src/hasher.hh @@ -0,0 +1,111 @@ +/** + * Copyright (c) 2023, Timothy Stack + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * * Neither the name of Timothy Stack nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef lnav_hasher_hh +#define lnav_hasher_hh + +#include <stdint.h> + +#include "base/auto_mem.hh" +#include "base/intern_string.hh" +#include "byte_array.hh" +#include "spookyhash/SpookyV2.h" + +class hasher { +public: + using array_t = byte_array<2, uint64_t>; + static constexpr size_t STRING_SIZE = array_t::STRING_SIZE; + + hasher() { this->h_context.Init(0, 0); } + + hasher& update(const std::string& str) + { + this->h_context.Update(str.data(), str.length()); + + return *this; + } + + hasher& update(const string_fragment& str) + { + this->h_context.Update(str.data(), str.length()); + + return *this; + } + + hasher& update(const char* bits, size_t len) + { + this->h_context.Update(bits, len); + + return *this; + } + + hasher& update(int64_t value) + { + value = SPOOKYHASH_LITTLE_ENDIAN_64(value); + this->h_context.Update(&value, sizeof(value)); + + return *this; + } + + array_t to_array() + { + uint64_t h1; + uint64_t h2; + array_t retval; + + this->h_context.Final(&h1, &h2); + *retval.out(0) = SPOOKYHASH_LITTLE_ENDIAN_64(h1); + *retval.out(1) = SPOOKYHASH_LITTLE_ENDIAN_64(h2); + return retval; + } + + void to_string(auto_buffer& buf) + { + array_t bits = this->to_array(); + + bits.to_string(std::back_inserter(buf)); + } + + std::string to_string() + { + array_t bits = this->to_array(); + return bits.to_string(); + } + + std::string to_uuid_string() + { + array_t bits = this->to_array(); + return bits.to_uuid_string(); + } + +private: + SpookyHash h_context; +}; + +#endif |