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58 lines
1.2 KiB
C++
58 lines
1.2 KiB
C++
/* Copyright (c) 2008-2014, Avian Contributors
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Permission to use, copy, modify, and/or distribute this software
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for any purpose with or without fee is hereby granted, provided
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that the above copyright notice and this permission notice appear
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in all copies.
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There is NO WARRANTY for this software. See license.txt for
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details. */
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#ifndef AVIAN_UTIL_HASH_H
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#define AVIAN_UTIL_HASH_H
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#include "slice.h"
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namespace avian {
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namespace util {
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inline uint32_t hash(const char* s)
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{
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uint32_t h = 0;
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for (unsigned i = 0; s[i]; ++i) {
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h = (h * 31) + s[i];
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}
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return h;
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}
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inline uint32_t hash(Slice<const uint8_t> data)
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{
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const uint8_t* s = data.begin();
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uint32_t h = 0;
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for (size_t i = 0; i < data.count; ++i) {
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h = (h * 31) + s[i];
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}
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return h;
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}
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inline uint32_t hash(Slice<const int8_t> data)
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{
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return hash(Slice<const uint8_t>(
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reinterpret_cast<const uint8_t*>(data.begin()), data.count));
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}
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inline uint32_t hash(Slice<const uint16_t> data)
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{
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const uint16_t* s = data.begin();
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uint32_t h = 0;
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for (size_t i = 0; i < data.count; ++i) {
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h = (h * 31) + s[i];
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}
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return h;
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}
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} // namespace util
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} // namespace avian
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#endif // AVIAN_UTIL_HASH_H
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