gecko-dev/netwerk/test/unit/test_bug654926_doom_and_read.js

const Cc = Components.classes;
const Ci = Components.interfaces;
const Cr = Components.results;

function gen_1MiB()
{
  var i;
  var data="x";
  for (i=0 ; i < 20 ; i++)
    data+=data;
  return data;
}

function write_and_check(str, data, len)
{
  var written = str.write(data, len);
  if (written != len) {
    do_throw("str.write has not written all data!\n" +
             "  Expected: " + len  + "\n" +
             "  Actual: " + written + "\n");
  }
}

function make_input_stream_scriptable(input) {
  var wrapper = Cc["@mozilla.org/scriptableinputstream;1"].
                createInstance(Ci.nsIScriptableInputStream);
  wrapper.init(input);
  return wrapper;
}

function write_datafile(status, entry)
{
  do_check_eq(status, Cr.NS_OK);
  var os = entry.openOutputStream(0);
  var data = gen_1MiB();

  write_and_check(os, data, data.length);

  os.close();
  entry.close();

  // open, doom, append, read
  asyncOpenCacheEntry("data",
                      "HTTP",
                      Ci.nsICache.STORE_ON_DISK,
                      Ci.nsICache.ACCESS_READ_WRITE,
                      test_read_after_doom);

}

function test_read_after_doom(status, entry)
{
  do_check_eq(status, Cr.NS_OK);
  var os = entry.openOutputStream(entry.dataSize);
  var data = gen_1MiB();

  entry.doom();
  write_and_check(os, data, data.length);

  os.close();

  var is = make_input_stream_scriptable(entry.openInputStream(0));
  var read = is.read(is.available());
  do_check_eq(read.length, 2*1024*1024);
  is.close();

  entry.close();
  do_test_finished();
}

function run_test() {
  do_get_profile();

  // clear the cache
  evict_cache_entries();

  // force to write file bigger than 5MiB
  asyncOpenCacheEntry("data",
                      "HTTP",
                      Ci.nsICache.STORE_ON_DISK_AS_FILE,
                      Ci.nsICache.ACCESS_WRITE,
                      write_datafile);

  do_test_pending();
}