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1 // Copyright (C) 1999,2000 Bruce Guenter <bruceg@em.ca> |
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2 // |
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3 // This program is free software; you can redistribute it and/or modify |
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4 // it under the terms of the GNU General Public License as published by |
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5 // the Free Software Foundation; either version 2 of the License, or |
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6 // (at your option) any later version. |
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7 // |
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8 // This program is distributed in the hope that it will be useful, |
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9 // but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 // GNU General Public License for more details. |
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12 // |
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13 // You should have received a copy of the GNU General Public License |
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14 // along with this program; if not, write to the Free Software |
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15 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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16 |
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17 #ifndef CDBXX__INTERNAL__H__ |
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18 #define CDBXX__INTERNAL__H__ |
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19 |
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20 #include "cdb++.h" |
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21 |
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22 #define CDB_HASHSTART ((uint32) 5381) |
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23 |
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24 inline void pack(unsigned char* buf, uint32 num) |
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25 { |
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26 *buf++ = num; num >>= 8; |
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27 *buf++ = num; num >>= 8; |
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28 *buf++ = num; num >>= 8; |
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29 *buf = num; |
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30 } |
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31 |
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32 inline uint32 unpack(const unsigned char* p) |
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33 { |
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34 return uint32(p[0]) | |
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35 uint32(p[1]) << 8 | |
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36 uint32(p[2]) << 16 | |
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37 uint32(p[3]) << 24; |
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38 } |
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39 |
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40 inline uint32 hash(const mystring& s) |
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41 { |
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42 uint32 h = CDB_HASHSTART; |
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43 const char* p = s.c_str(); |
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44 for(unsigned len = s.length(); len > 0; len--) |
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45 h = ((h << 5) + h) ^ *p++; |
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46 return h; |
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47 } |
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48 |
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49 #endif |