Fix usage of zim::Searcher::getResults() in libkiwix

The correct usage does not require the user to calculate an `end` using
the `pageLength`. We can directly use getResults(start, pageLength)

include/searcher.h

@@ -85,12 +85,12 @@ class Searcher
    *
    * @param search The search query.
    * @param resultStart the start offset of the search results (used for pagination).
-   * @param resultEnd the end offset of the search results (used for pagination).
+   * @param maxResultCount Maximum results to get from start (used for pagination).
    * @param verbose print some info on stdout if true.
    */
   void search(const std::string& search,
               unsigned int resultStart,
-              unsigned int resultEnd,
+              unsigned int maxResultCount,
               const bool verbose = false);
 
   /**
@@ -104,12 +104,12 @@ class Searcher
    * @param longitude The longitude of the center point.
    * @param distance The radius of the disc.
    * @param resultStart the start offset of the search results (used for pagination).
-   * @param resultEnd the end offset of the search results (used for pagination).
+   * @param maxResultCount Maximum number of results to get from start (used for pagination).
    * @param verbose print some info on stdout if true.
    */
   void geo_search(float latitude, float longitude, float distance,
                   unsigned int resultStart,
-                  unsigned int resultEnd,
+                  unsigned int maxResultCount,
                   const bool verbose = false);
 
   /**
@@ -148,14 +148,14 @@ class Searcher
   zim::SearchResultSet getSearchResultSet();
 
   unsigned int getResultStart() { return resultStart; }
-  unsigned int getResultEnd() { return resultEnd; }
+  unsigned int getMaxResultCount() { return maxResultCount; }
 
  protected:
   std::string beautifyInteger(const unsigned int number);
   void closeIndex();
   void searchInIndex(string& search,
                      const unsigned int resultStart,
-                     const unsigned int resultEnd,
+                     const unsigned int maxResultCount,
                      const bool verbose = false);
 
   std::vector<Reader*> readers;
@@ -163,7 +163,7 @@ class Searcher
   std::string searchPattern;
   unsigned int estimatedResultCount;
   unsigned int resultStart;
-  unsigned int resultEnd;
+  unsigned int maxResultCount;
 
  private:
   void reset();

src/searcher.cpp

@@ -67,7 +67,7 @@ Searcher::Searcher()
     : searchPattern(""),
       estimatedResultCount(0),
       resultStart(0),
-      resultEnd(0)
+      maxResultCount(0)
 {
   loadICUExternalTables();
 }
@@ -95,7 +95,7 @@ Reader* Searcher::get_reader(int readerIndex)
 /* Search strings in the database */
 void Searcher::search(const std::string& search,
                       unsigned int resultStart,
-                      unsigned int resultEnd,
+                      unsigned int maxResultCount,
                       const bool verbose)
 {
   this->reset();
@@ -106,9 +106,9 @@ void Searcher::search(const std::string& search,
 
   this->searchPattern = search;
   this->resultStart = resultStart;
-  this->resultEnd = resultEnd;
+  this->maxResultCount = maxResultCount;
   /* Try to find results */
-  if (resultStart != resultEnd) {
+  if (maxResultCount != 0) {
     /* Perform the search */
     string unaccentedSearch = removeAccents(search);
     std::vector<zim::Archive> archives;
@@ -123,7 +123,7 @@ void Searcher::search(const std::string& search,
     query.setQuery(unaccentedSearch, false);
     query.setVerbose(verbose);
     zim::Search search = searcher.search(query);
-    internal.reset(new SearcherInternal(search.getResults(resultStart, resultEnd)));
+    internal.reset(new SearcherInternal(search.getResults(resultStart, maxResultCount)));
     this->estimatedResultCount = search.getEstimatedMatches();
   }
 
@@ -133,7 +133,7 @@ void Searcher::search(const std::string& search,
 
 void Searcher::geo_search(float latitude, float longitude, float distance,
                           unsigned int resultStart,
-                          unsigned int resultEnd,
+                          unsigned int maxResultCount,
                           const bool verbose)
 {
   this->reset();
@@ -147,10 +147,10 @@ void Searcher::geo_search(float latitude, float longitude, float distance,
   oss << "Articles located less than " << distance << " meters of " << latitude << ";" << longitude;
   this->searchPattern = oss.str();
   this->resultStart = resultStart;
-  this->resultEnd = resultEnd;
+  this->maxResultCount = maxResultCount;
 
   /* Try to find results */
-  if (resultStart == resultEnd) {
+  if (maxResultCount == 0) {
     return;
   }
 
@@ -165,7 +165,7 @@ void Searcher::geo_search(float latitude, float longitude, float distance,
   query.setQuery("", false);
   query.setGeorange(latitude, longitude, distance);
   zim::Search search = searcher.search(query);
-  internal.reset(new SearcherInternal(search.getResults(resultStart, resultEnd)));
+  internal.reset(new SearcherInternal(search.getResults(resultStart, maxResultCount)));
   this->estimatedResultCount = search.getEstimatedMatches();
 }
 
@@ -206,7 +206,7 @@ void Searcher::suggestions(std::string& searchPattern, const bool verbose)
 
   this->searchPattern = searchPattern;
   this->resultStart = 0;
-  this->resultEnd = 10;
+  this->maxResultCount = 10;
   string unaccentedSearch = removeAccents(searchPattern);
 
   std::vector<zim::Archive> archives;
@@ -219,7 +219,7 @@ void Searcher::suggestions(std::string& searchPattern, const bool verbose)
   query.setVerbose(verbose);
   query.setQuery(unaccentedSearch, true);
   zim::Search search = searcher.search(query);
-  internal.reset(new SearcherInternal(search.getResults(resultStart, resultEnd)));
+  internal.reset(new SearcherInternal(search.getResults(resultStart, maxResultCount)));
   this->estimatedResultCount = search.getEstimatedMatches();
 }
 

src/server/internalServer.cpp

@@ -589,8 +589,6 @@ std::unique_ptr<Response> InternalServer::handle_search(const RequestContext& re
     pageLength = 25;
   }
 
-  auto end = start + pageLength;
-
   /* Get the results */
   try {
     zim::Query query;
@@ -615,7 +613,7 @@ std::unique_ptr<Response> InternalServer::handle_search(const RequestContext& re
     }
 
     zim::Search search = searcher->search(query);
-    SearchRenderer renderer(search.getResults(start, end), mp_nameMapper, start,
+    SearchRenderer renderer(search.getResults(start, pageLength), mp_nameMapper, start,
                             search.getEstimatedMatches());
     renderer.setSearchPattern(patternString);
     renderer.setSearchContent(bookName);

test/searcher.cpp

@@ -32,7 +32,7 @@ TEST(Searcher, incrementalRange) {
 
   int suggCount = 0;
   for (int i = 0; i < 10; i++) {
-    auto srs = search.getResults(i*5, (i + 1)*5); // get 5 results
+    auto srs = search.getResults(i*5, 5); // get 5 results
     ASSERT_EQ(srs.size(), 5);
     suggCount += srs.size();
   }