nsresult
nsJARChannel::LookupFile(bool aAllowAsync)
{
LOG(("nsJARChannel::LookupFile [this=%x %s]\n", this, mSpec.get()));
if (mJarFile)
return NS_OK;
nsresult rv;
nsCOMPtr<nsIURI> uri;
rv = mJarURI->GetJARFile(getter_AddRefs(mJarBaseURI));
if (NS_FAILED(rv))
return rv;
rv = mJarURI->GetJAREntry(mJarEntry);
if (NS_FAILED(rv))
return rv;
// The name of the JAR entry must not contain URL-escaped characters:
// we're moving from URL domain to a filename domain here. nsStandardURL
// does basic escaping by default, which breaks reading zipped files which
// have e.g. spaces in their filenames.
NS_UnescapeURL(mJarEntry);
// try to get a nsIFile directly from the url, which will often succeed.
{
nsCOMPtr<nsIFileURL> fileURL = do_QueryInterface(mJarBaseURI);
if (fileURL)
fileURL->GetFile(getter_AddRefs(mJarFile));
}
// if we're in child process and have special "remoteopenfile:://" scheme,
// create special nsIFile that gets file handle from parent when opened.
if (!mJarFile && !gJarHandler->IsMainProcess()) {
nsAutoCString scheme;
rv = mJarBaseURI->GetScheme(scheme);
if (NS_SUCCEEDED(rv) && scheme.EqualsLiteral("remoteopenfile")) {
RefPtr<RemoteOpenFileChild> remoteFile = new RemoteOpenFileChild();
rv = remoteFile->Init(mJarBaseURI, mAppURI);
NS_ENSURE_SUCCESS(rv, rv);
mJarFile = remoteFile;
nsIZipReaderCache *jarCache = gJarHandler->JarCache();
if (jarCache) {
bool cached = false;
rv = jarCache->IsCached(mJarFile, &cached);
if (NS_SUCCEEDED(rv) && cached) {
// zipcache already has file mmapped: don't open on parent,
// just return and proceed to cache hit in CreateJarInput().
// When the file descriptor is needed, get it from JAR cache
// if available, otherwise do the remote open to get a new
// one.
#if defined(XP_WIN) || defined(MOZ_WIDGET_COCOA)
// Windows/OSX desktop builds skip remoting, we don't need
// file descriptor here.
return NS_OK;
#else
PRFileDesc *fd = nullptr;
jarCache->GetFd(mJarFile, &fd);
if (fd) {
return SetRemoteNSPRFileDesc(fd);
}
#endif
}
}
if (!aAllowAsync) {
mJarFile = nullptr;
return NS_OK;
}
mOpeningRemote = true;
if (gJarHandler->RemoteOpenFileInProgress(remoteFile, this)) {
// JarHandler will trigger OnRemoteFileOpen() after the first
// request for this file completes and we'll get a JAR cache
// hit.
return NS_OK;
}
// Open file on parent: OnRemoteFileOpenComplete called when done
nsCOMPtr<nsITabChild> tabChild;
NS_QueryNotificationCallbacks(this, tabChild);
nsCOMPtr<nsILoadContext> loadContext;
NS_QueryNotificationCallbacks(this, loadContext);
rv = remoteFile->AsyncRemoteFileOpen(PR_RDONLY, this, tabChild,
loadContext);
NS_ENSURE_SUCCESS(rv, rv);
}
}
// try to handle a nested jar
if (!mJarFile) {
nsCOMPtr<nsIJARURI> jarURI = do_QueryInterface(mJarBaseURI);
if (jarURI) {
nsCOMPtr<nsIFileURL> fileURL;
nsCOMPtr<nsIURI> innerJarURI;
rv = jarURI->GetJARFile(getter_AddRefs(innerJarURI));
if (NS_SUCCEEDED(rv))
fileURL = do_QueryInterface(innerJarURI);
if (fileURL) {
fileURL->GetFile(getter_AddRefs(mJarFile));
jarURI->GetJAREntry(mInnerJarEntry);
}
}
}
return rv;
}
