70 lines
1.3 KiB
C++
70 lines
1.3 KiB
C++
/*
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* Copyright 2004-2007, Ingo Weinhold, bonefish@users.sf.net. All rights reserved.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef HASH_STRING_H
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#define HASH_STRING_H
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#include <SupportDefs.h>
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// string_hash
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//
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// from the Dragon Book: a slightly modified hashpjw()
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static inline
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uint32
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string_hash(const char *name)
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{
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uint32 h = 0;
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if (name) {
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for (; *name; name++) {
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uint32 g = h & 0xf0000000;
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if (g)
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h ^= g >> 24;
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h = (h << 4) + *name;
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}
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}
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return h;
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}
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#ifdef __cplusplus
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namespace BPrivate {
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// HashString
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class HashString {
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public:
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HashString();
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HashString(const HashString &string);
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HashString(const char *string, int32 length = -1);
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~HashString();
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bool SetTo(const char *string, int32 maxLength = -1);
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void Unset();
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void Truncate(int32 newLength);
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const char *GetString() const;
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int32 GetLength() const { return fLength; }
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uint32 GetHashCode() const { return string_hash(GetString()); }
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HashString &operator=(const HashString &string);
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bool operator==(const HashString &string) const;
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bool operator!=(const HashString &string) const { return !(*this == string); }
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private:
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bool _SetTo(const char *string, int32 length);
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private:
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int32 fLength;
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char *fString;
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};
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} // namespace BPrivate
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using BPrivate::HashString;
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#endif // __cplusplus
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#endif // HASH_STRING_H
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