michael@0: var _PSvc;
michael@0: function get_pref_service() {
michael@0:   if (_PSvc)
michael@0:     return _PSvc;
michael@0: 
michael@0:   return _PSvc = Cc["@mozilla.org/preferences-service;1"].
michael@0:                  getService(Ci.nsIPrefBranch);
michael@0: }
michael@0: 
michael@0: function gen_1MiB()
michael@0: {
michael@0:   var i;
michael@0:   var data="x";
michael@0:   for (i=0 ; i < 20 ; i++)
michael@0:     data+=data;
michael@0:   return data;
michael@0: }
michael@0: 
michael@0: function write_and_check(str, data, len)
michael@0: {
michael@0:   var written = str.write(data, len);
michael@0:   if (written != len) {
michael@0:     do_throw("str.write has not written all data!\n" +
michael@0:              "  Expected: " + len  + "\n" +
michael@0:              "  Actual: " + written + "\n");
michael@0:   }
michael@0: }
michael@0: 
michael@0: function write_datafile(status, entry)
michael@0: {
michael@0:   do_check_eq(status, Cr.NS_OK);
michael@0:   var os = entry.openOutputStream(0);
michael@0:   var data = gen_1MiB();
michael@0: 
michael@0:   // write 2MiB
michael@0:   var i;
michael@0:   for (i=0 ; i<2 ; i++)
michael@0:     write_and_check(os, data, data.length);
michael@0: 
michael@0:   os.close();
michael@0:   entry.close();
michael@0: 
michael@0:   // now change max_entry_size so that the existing entry is too big
michael@0:   get_pref_service().setIntPref("browser.cache.disk.max_entry_size", 1024);
michael@0: 
michael@0:   // append to entry
michael@0:   asyncOpenCacheEntry("http://data/",
michael@0:                       "disk", Ci.nsICacheStorage.OPEN_NORMALLY, null,
michael@0:                       append_datafile);
michael@0: }
michael@0: 
michael@0: function append_datafile(status, entry)
michael@0: {
michael@0:   do_check_eq(status, Cr.NS_OK);
michael@0:   var os = entry.openOutputStream(entry.dataSize);
michael@0:   var data = gen_1MiB();
michael@0: 
michael@0:   // append 1MiB
michael@0:   try {
michael@0:     write_and_check(os, data, data.length);
michael@0:     do_throw();
michael@0:   }
michael@0:   catch (ex) { }
michael@0: 
michael@0:   // closing the ostream should fail in this case
michael@0:   try {
michael@0:     os.close();
michael@0:     do_throw();
michael@0:   }
michael@0:   catch (ex) { }
michael@0: 
michael@0:   entry.close();
michael@0: 
michael@0:   do_test_finished();
michael@0: }
michael@0: 
michael@0: function run_test() {
michael@0:   if (newCacheBackEndUsed()) {
michael@0:     // Needs limit preferences
michael@0:     do_check_true(true, "This test doesn't run with the new cache backend, the test or the cache needs to be fixed");
michael@0:     return;
michael@0:   }
michael@0: 
michael@0:   do_get_profile();
michael@0: 
michael@0:   // clear the cache
michael@0:   evict_cache_entries();
michael@0: 
michael@0:   asyncOpenCacheEntry("http://data/",
michael@0:                       "disk", Ci.nsICacheStorage.OPEN_NORMALLY, null,
michael@0:                       write_datafile);
michael@0: 
michael@0:   do_test_pending();
michael@0: }