comparison create.cpp @ 239:2cc06e5b05a5

Merge refactoring branch.

Bug fixes:
* 64-bit powertable bug;
* -inf - -inf bug;
* use new times information;
* plus short track, O2_MAXFILES and structure padding ABI fixes (already
  backported)

Major code changes:
* split source into functional units, known as 'files';
* Reporter class for accumulating and reporting on query results;
* much OAOOization, mostly from above: net 800 LOC (25%) shorter.

+#include "audioDB.h"
+
+/* Make a new database.
+
+   The database consists of:
+
+   * a header (see dbTableHeader struct definition);
+   * keyTable: list of keys of tracks;
+   * trackTable: Maps implicit feature index to a feature vector
+     matrix (sizes of tracks)
+   * featureTable: Lots of doubles;
+   * timesTable: (start,end) time points for each feature vector;
+   * powerTable: associated power for each feature vector;
+   * l2normTable: squared l2norms for each feature vector.
+*/
+
+void audioDB::create(const char* dbName){
+  if ((dbfid = open (dbName, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)) < 0)
+    error("Can't create database file", dbName, "open");
+  get_lock(dbfid, 1);
+
+  VERB_LOG(0, "header size: %ju\n", (intmax_t) O2_HEADERSIZE);
+  
+  dbH = new dbTableHeaderT();
+  assert(dbH);
+
+  unsigned int maxfiles = (unsigned int) rint((double) O2_MAXFILES * (double) size / (double) O2_DEFAULTDBSIZE);
+
+  // Initialize header
+  dbH->magic = O2_MAGIC;
+  dbH->version = O2_FORMAT_VERSION;
+  dbH->numFiles = 0;
+  dbH->dim = 0;
+  dbH->flags = 0;
+  dbH->headerSize = O2_HEADERSIZE;
+  dbH->length = 0;
+  dbH->fileTableOffset = ALIGN_PAGE_UP(O2_HEADERSIZE);
+  dbH->trackTableOffset = ALIGN_PAGE_UP(dbH->fileTableOffset + O2_FILETABLESIZE*maxfiles);
+  dbH->dataOffset = ALIGN_PAGE_UP(dbH->trackTableOffset + O2_TRACKTABLESIZE*maxfiles);
+  dbH->l2normTableOffset = ALIGN_PAGE_DOWN(size - maxfiles*O2_MEANNUMVECTORS*sizeof(double));
+  dbH->powerTableOffset = ALIGN_PAGE_DOWN(dbH->l2normTableOffset - maxfiles*O2_MEANNUMVECTORS*sizeof(double));
+  dbH->timesTableOffset = ALIGN_PAGE_DOWN(dbH->powerTableOffset - 2*maxfiles*O2_MEANNUMVECTORS*sizeof(double));
+  dbH->dbSize = size;
+
+  write(dbfid, dbH, O2_HEADERSIZE);
+
+  // go to the location corresponding to the last byte
+  if (lseek (dbfid, size - 1, SEEK_SET) == -1)
+    error("lseek error in db file", "", "lseek");
+
+  // write a dummy byte at the last location
+  if (write (dbfid, "", 1) != 1)
+    error("write error", "", "write");
+
+  VERB_LOG(0, "%s %s\n", COM_CREATE, dbName);
+}
+
+void audioDB::drop(){
+  // FIXME: drop something?  Should we even allow this?
+}
+