48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
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#define toupper(c) (((c) >= 'a' && (c) <= 'z') ? (c) ^ 0x20 : (c))
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//哈希运算种子表
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static cryptTable[0x500];
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//哈希种子表是否初始化
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static int cryptTableInited = 0;
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static void initCryptrTable()
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{
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unsigned long seed = 0x00100001, index1 = 0, index2 = 0, i;
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for( index1 = 0; index1 < 0x100; index1++ )
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{
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for( index2 = index1, i = 0; i < 5; i++, index2 += 0x100 )
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{
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unsigned long temp1, temp2;
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seed = (seed * 125 + 3) % 0x2AAAAB;
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temp1 = (seed & 0xFFFF) << 0x10;
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seed = (seed * 125 + 3) % 0x2AAAAB;
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temp2 = (seed & 0xFFFF);
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cryptTable[index2] = ( temp1 | temp2 );
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}
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}
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}
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unsigned long bzhashstr(const char *str, unsigned long seed)
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{
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unsigned char *key = (unsigned char *)str;
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unsigned long seed1 = 0x7FED7FED, seed2 = 0xEEEEEEEE;
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int ch;
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if (!cryptTableInited)
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{
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initCryptrTable();
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cryptTableInited = 1;
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}
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while(*key != 0)
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{
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ch = *key++;
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ch = toupper(ch);
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seed1 = cryptTable[(seed << 8) + ch] ^ (seed1 + seed2);
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seed2 = ch + seed1 + seed2 + (seed2 << 5) + 3;
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}
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return seed1;
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}
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