gecko-dev/netwerk/test/unit/test_bug654926_test_seek.js

88 lines
2.1 KiB
JavaScript

const Cc = Components.classes;
const Ci = Components.interfaces;
const Cr = Components.results;
var _CSvc;
function get_cache_service() {
if (_CSvc)
return _CSvc;
return _CSvc = Cc["@mozilla.org/network/cache-service;1"].
getService(Ci.nsICacheService);
}
function get_ostream_for_entry(key, asFile, append, entryRef)
{
var cache = get_cache_service();
var session = cache.createSession(
"HTTP",
asFile ? Ci.nsICache.STORE_ON_DISK_AS_FILE
: Ci.nsICache.STORE_ON_DISK,
Ci.nsICache.STREAM_BASED);
var cacheEntry = session.openCacheEntry(
key,
append ? Ci.nsICache.ACCESS_READ_WRITE
: Ci.nsICache.ACCESS_WRITE,
true);
var oStream = cacheEntry.openOutputStream(append ? cacheEntry.dataSize : 0);
entryRef.value = cacheEntry;
return oStream;
}
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 write_datafile()
{
var entry = {};
var oStr = get_ostream_for_entry("data", true, false, entry);
var data = gen_1MiB();
write_and_check(oStr, data, data.length);
oStr.close();
entry.value.close();
}
function open_for_readwrite()
{
var entry = {};
var oStr = get_ostream_for_entry("data", false, true, entry);
// Opening the entry for appending data calls nsDiskCacheStreamIO::Seek()
// which initializes mFD. If no data is written then mBufDirty is false and
// mFD won't be closed in nsDiskCacheStreamIO::Flush().
oStr.close();
entry.value.close();
}
function run_test() {
do_get_profile();
// clear the cache
get_cache_service().evictEntries(Ci.nsICache.STORE_ANYWHERE);
// force to write file bigger than 5MiB
write_datafile();
// try to open the entry for appending
open_for_readwrite();
}