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28 lines
834 B
28 lines
834 B
// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
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//
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// This Source Code Form is subject to the terms of the MIT License.
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// If a copy of the MIT was not distributed with this file,
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// You can obtain one at https://github.com/gogf/gf.
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package ghash
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// SDBM implements the classic SDBM hash algorithm for 32 bits.
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func SDBM(str []byte) uint32 {
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var hash uint32
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for i := 0; i < len(str); i++ {
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// equivalent to: hash = 65599*hash + uint32(str[i]);
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hash = uint32(str[i]) + (hash << 6) + (hash << 16) - hash
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}
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return hash
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}
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// SDBM64 implements the classic SDBM hash algorithm for 64 bits.
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func SDBM64(str []byte) uint64 {
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var hash uint64
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for i := 0; i < len(str); i++ {
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// equivalent to: hash = 65599*hash + uint32(str[i])
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hash = uint64(str[i]) + (hash << 6) + (hash << 16) - hash
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}
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return hash
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}
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