1 | /**************************************************************************
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2 | *
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3 | * Weights.h -- Dealing with document weights
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4 | * Copyright (C) 1999 Rodger McNab
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5 | *
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6 | * This program is free software; you can redistribute it and/or modify
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7 | * it under the terms of the GNU General Public License as published by
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8 | * the Free Software Foundation; either version 2 of the License, or
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9 | * (at your option) any later version.
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10 | *
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11 | * This program is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | * GNU General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU General Public License
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17 | * along with this program; if not, write to the Free Software
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18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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19 | *
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20 | **************************************************************************/
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21 |
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22 | #ifndef WEIGHTS_H
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23 | #define WEIGHTS_H
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24 |
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25 | #include <stdio.h>
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26 |
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27 |
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28 | class ApproxWeightsData {
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29 | public:
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30 | unsigned char bits;
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31 | unsigned long mask;
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32 | double L;
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33 | double B;
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34 | unsigned long numLevelDocs;
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35 | unsigned long *weightBuf;
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36 | float *table; // precomputed translation table
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37 |
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38 | ApproxWeightsData ();
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39 | ~ApproxWeightsData ();
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40 |
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41 | void Free (); // frees any allocated memory
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42 |
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43 | bool Read (FILE *approxWeightsFile, unsigned long diskPtr,
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44 | unsigned long _numLevelDocs);
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45 |
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46 | float GetLowerApproxDocWeight (unsigned long levelDocNum);
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47 | };
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48 |
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49 |
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50 | // diskPtr points to the start of the exact document weights
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51 | // for this level
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52 | float GetExactDocWeight (FILE *exactWeightsFile, unsigned long diskPtr,
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53 | unsigned long levelDocNum);
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54 |
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55 |
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56 | #endif
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