view liszt.cpp @ 458:913a95f06998 api-inversion

Start using the query state structure.

Actually using it means moving it around in the source code a little
bit, thanks to entanglements.  It'll all be alright on the night.  Now
the accumulator, allowed_keys and exact_evaluation_queue are all part of
the query state, and can therefore be passed around with minimal effort
(and deleted in the appropriate place).

Now a whole bunch of static methods (the callbacks, basically) in
index.cpp can be rewritten as plain old C functions.  The callbacks need
both an adb_t and a query state structure to function (the adb_t to get
at things like lsh_n_point_bits and the track->key table; the qstate to
get at the accumulator and allowed_keys list).

Rearrange audioDB::query a little bit, and mark the beginning and the
end of the putative audiodb_query_spec() API function implementation.

#include "audioDB.h"

void audioDB::liszt(const char* dbName, unsigned offset, unsigned numLines, adb__lisztResponse* adbLisztResponse){
  if(!dbH) {
    initTables(dbName, 0);
  }

  assert(trackTable && fileTable);

  if(offset>dbH->numFiles){
    char tmpStr[MAXSTR];
    sprintf(tmpStr, "numFiles=%u, lisztOffset=%u", dbH->numFiles, offset);
    error("listKeys offset out of range", tmpStr);
  }

  if(!adbLisztResponse){
    for(Uns32T k=0; k<numLines && offset+k<dbH->numFiles; k++){
      fprintf(stdout, "[%d] %s (%d)\n", offset+k, fileTable+(offset+k)*O2_FILETABLE_ENTRY_SIZE, trackTable[offset+k]);
    }
  }
  else{
    adbLisztResponse->result.Rkey = new char*[numLines];
    adbLisztResponse->result.Rlen = new unsigned int[numLines];
    Uns32T k = 0;
    for( ; k<numLines && offset+k<dbH->numFiles; k++){    
      adbLisztResponse->result.Rkey[k] = new char[MAXSTR];
      snprintf(adbLisztResponse->result.Rkey[k], O2_MAXFILESTR, "%s", fileTable+(offset+k)*O2_FILETABLE_ENTRY_SIZE);
      adbLisztResponse->result.Rlen[k] = trackTable[offset+k];
    }
    adbLisztResponse->result.__sizeRkey = k;
    adbLisztResponse->result.__sizeRlen = k;
  }
  
}