376 lines
9.3 KiB
C++
376 lines
9.3 KiB
C++
/*
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* Copyright 2003 Kevin B. Hendricks, Stratford, Ontario, Canada
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* And Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. All modifications to the source code must be clearly marked as
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* such. Binary redistributions based on modified source code
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* must be clearly marked as modified versions in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY KEVIN B. HENDRICKS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* KEVIN B. HENDRICKS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "mythes.hxx"
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// some basic utility routines
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// return index of char in string
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int mystr_indexOfChar(const char * d, int c)
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{
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const char * p = strchr(d,c);
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if (p) return (int)(p-d);
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return -1;
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}
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MyThes::MyThes(const char* idxpath, const char * datpath)
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{
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nw = 0;
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encoding = NULL;
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list = NULL;
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offst = NULL;
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if (thInitialize(idxpath, datpath) != 1) {
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fprintf(stderr,"Error - can't open %s or %s\n",idxpath, datpath);
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fflush(stderr);
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if (encoding) free((void*)encoding);
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if (list) free((void*)list);
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if (offst) free((void*)offst);
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// did not initialize properly - throw exception?
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}
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}
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MyThes::~MyThes()
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{
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if (thCleanup() != 1) {
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/* did not cleanup properly - throw exception? */
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}
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if (encoding) free((void*)encoding);
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encoding = NULL;
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list = NULL;
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offst = NULL;
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}
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int MyThes::thInitialize(const char* idxpath, const char* datpath)
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{
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// open the index file
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FILE * pifile = fopen(idxpath,"r");
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if (!pifile) {
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pifile = NULL;
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return 0;
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}
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// parse in encoding and index size */
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char * wrd;
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wrd = (char *)calloc(1, MAX_WD_LEN);
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int len = readLine(pifile,wrd,MAX_WD_LEN);
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encoding = mystrdup(wrd);
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len = readLine(pifile,wrd,MAX_WD_LEN);
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int idxsz = atoi(wrd);
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// now allocate list, offst for the given size
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list = (char**) calloc(idxsz,sizeof(char*));
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offst = (unsigned int*) calloc(idxsz,sizeof(unsigned int));
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if ( (!(list)) || (!(offst)) ) {
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fprintf(stderr,"Error - bad memory allocation\n");
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fflush(stderr);
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return 0;
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}
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// now parse the remaining lines of the index
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len = readLine(pifile,wrd,MAX_WD_LEN);
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while (len > 0)
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{
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int np = mystr_indexOfChar(wrd,'|');
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if (nw < idxsz) {
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if (np >= 0) {
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*(wrd+np) = '\0';
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list[nw] = (char *)calloc(1,(np+1));
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memcpy((list[nw]),wrd,np);
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offst[nw] = atoi(wrd+np+1);
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nw++;
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}
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}
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len = readLine(pifile,wrd,MAX_WD_LEN);
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}
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free((void *)wrd);
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fclose(pifile);
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pifile=NULL;
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/* next open the data file */
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pdfile = fopen(datpath,"r");
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if (!pdfile) {
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pdfile = NULL;
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return 0;
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}
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return 1;
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}
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int MyThes::thCleanup()
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{
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/* first close the data file */
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if (pdfile) {
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fclose(pdfile);
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pdfile=NULL;
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}
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/* now free up all the allocated strings on the list */
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for (int i=0; i < nw; i++)
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{
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if (list[i]) {
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free(list[i]);
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list[i] = 0;
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}
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}
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if (list) free((void*)list);
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if (offst) free((void*)offst);
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nw = 0;
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return 1;
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}
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// lookup text in index and count of meanings and a list of meaning entries
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// with each entry having a synonym count and pointer to an
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// array of char * (i.e the synonyms)
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//
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// note: calling routine should call CleanUpAfterLookup with the original
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// meaning point and count to properly deallocate memory
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int MyThes::Lookup(const char * pText, int len, mentry** pme)
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{
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*pme = NULL;
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// handle the case of missing file or file related errors
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if (! pdfile) return 0;
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long offset = 0;
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/* copy search word and make sure null terminated */
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char * wrd = (char *) calloc(1,(len+1));
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memcpy(wrd,pText,len);
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/* find it in the list */
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int idx = binsearch(wrd,list,nw);
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free(wrd);
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if (idx < 0) return 0;
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// now seek to the offset
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offset = (long) offst[idx];
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int rc = fseek(pdfile,offset,SEEK_SET);
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if (rc) {
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return 0;
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}
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// grab the count of the number of meanings
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// and allocate a list of meaning entries
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char * buf = NULL;
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buf = (char *) malloc( MAX_LN_LEN );
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if (!buf) return 0;
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readLine(pdfile, buf, (MAX_LN_LEN-1));
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int np = mystr_indexOfChar(buf,'|');
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if (np < 0) {
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free(buf);
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return 0;
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}
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int nmeanings = atoi(buf+np+1);
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*pme = (mentry*) malloc( nmeanings * sizeof(mentry) );
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if (!(*pme)) {
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free(buf);
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return 0;
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}
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// now read in each meaning and parse it to get defn, count and synonym lists
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mentry* pm = *(pme);
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char dfn[MAX_WD_LEN];
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for (int j = 0; j < nmeanings; j++) {
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readLine(pdfile, buf, (MAX_LN_LEN-1));
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pm->count = 0;
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pm->psyns = NULL;
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pm->defn = NULL;
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// store away the part of speech for later use
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char * p = buf;
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char * pos = NULL;
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np = mystr_indexOfChar(p,'|');
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if (np >= 0) {
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*(buf+np) = '\0';
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pos = mystrdup(p);
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p = p + np + 1;
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} else {
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pos = mystrdup("");
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}
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// count the number of fields in the remaining line
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int nf = 1;
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char * d = p;
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np = mystr_indexOfChar(d,'|');
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while ( np >= 0 ) {
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nf++;
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d = d + np + 1;
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np = mystr_indexOfChar(d,'|');
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}
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pm->count = nf;
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pm->psyns = (char **) malloc(nf*sizeof(char*));
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// fill in the synonym list
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d = p;
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for (int j = 0; j < nf; j++) {
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np = mystr_indexOfChar(d,'|');
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if (np > 0) {
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*(d+np) = '\0';
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pm->psyns[j] = mystrdup(d);
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d = d + np + 1;
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} else {
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pm->psyns[j] = mystrdup(d);
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}
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}
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// add pos to first synonym to create the definition
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int k = strlen(pos);
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int m = strlen(pm->psyns[0]);
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if ((k+m) < (MAX_WD_LEN - 1)) {
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strncpy(dfn,pos,k);
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*(dfn+k) = ' ';
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strncpy((dfn+k+1),(pm->psyns[0]),m+1);
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pm->defn = mystrdup(dfn);
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} else {
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pm->defn = mystrdup(pm->psyns[0]);
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}
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free(pos);
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pm++;
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}
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free(buf);
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return nmeanings;
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}
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void MyThes::CleanUpAfterLookup(mentry ** pme, int nmeanings)
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{
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if (nmeanings == 0) return;
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if ((*pme) == NULL) return;
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mentry * pm = *pme;
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for (int i = 0; i < nmeanings; i++) {
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int count = pm->count;
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for (int j = 0; j < count; j++) {
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if (pm->psyns[j]) free(pm->psyns[j]);
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pm->psyns[j] = NULL;
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}
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if (pm->psyns) free(pm->psyns);
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pm->psyns = NULL;
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if (pm->defn) free(pm->defn);
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pm->defn = NULL;
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pm->count = 0;
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pm++;
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}
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pm = *pme;
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free(pm);
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*pme = NULL;
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return;
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}
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// read a line of text from a text file stripping
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// off the line terminator and replacing it with
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// a null string terminator.
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// returns: -1 on error or the number of characters in
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// in the returning string
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// A maximum of nc characters will be returned
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int MyThes::readLine(FILE * pf, char * buf, int nc)
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{
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if (fgets(buf,nc,pf)) {
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mychomp(buf);
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return strlen(buf);
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}
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return -1;
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}
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// performs a binary search on null terminated character
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// strings
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//
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// returns: -1 on not found
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// index of wrd in the list[]
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int MyThes::binsearch(char * sw, char* list[], int nlst)
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{
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int lp, up, mp, j, indx;
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lp = 0;
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up = nlst-1;
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indx = -1;
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if (strcmp(sw,list[lp]) < 0) return -1;
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if (strcmp(sw,list[up]) > 0) return -1;
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while (indx < 0 ) {
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mp = (int)((lp+up) >> 1);
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j = strcmp(sw,list[mp]);
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if ( j > 0) {
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lp = mp + 1;
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} else if (j < 0 ) {
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up = mp - 1;
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} else {
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indx = mp;
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}
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if (lp > up) return -1;
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}
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return indx;
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}
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char * MyThes::get_th_encoding()
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{
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if (encoding) return encoding;
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return NULL;
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}
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