!7

concept BigEntry {
  S globalID;
  long fileNr, headerStart, start, length;
}

p {
  dbIndexing(BigEntry, 'globalID);
  
  S s = "Hello world";
  BigEntry entry = db_newStringEntry(s);
  print("Stored as: " + renderConcept(entry));
  assertEqualsVerbose(s, db_getText(entry));
  print("OK");
}

static BigEntry db_newStringEntry(S text) {
  lock dbLock();
  long fileNr = fileNrToAppendTo();
  S globalID = aGlobalID();
  File file = db_file(fileNr);
  long length = fileSize(file);
  long l = lUtf8(text);
  S header = globalID + " " + l + "\n";
  long start = length + lUtf8(header);
  appendToTextFile(file, header + text + "\n");
  ret cnew(BigEntry, +globalID, +fileNr, headerStart := length, +start, length := l);
}

static long fileNrToAppendTo() {
  ret 1;
}

static File db_file(long nr) {
  ret getProgramFile("db." + nr);
}

static S db_getText(BigEntry entry) {
  File f = db_file(entry.fileNr);
  ret fromUtf8(loadBinaryFilePart(f, entry.start, entry.start+entry.length));
}