1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/dom/file/FileHandle.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,195 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim: set ts=2 et sw=2 tw=80: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this file,
1.8 + * You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#include "FileHandle.h"
1.11 +
1.12 +#include "nsContentUtils.h"
1.13 +#include "nsDOMClassInfoID.h"
1.14 +#include "nsNetUtil.h"
1.15 +
1.16 +#include "nsIDOMFile.h"
1.17 +#include "nsIFileStorage.h"
1.18 +
1.19 +#include "File.h"
1.20 +#include "FileRequest.h"
1.21 +#include "FileService.h"
1.22 +#include "LockedFile.h"
1.23 +#include "MetadataHelper.h"
1.24 +#include "mozilla/dom/FileHandleBinding.h"
1.25 +
1.26 +using namespace mozilla;
1.27 +using namespace mozilla::dom;
1.28 +USING_FILE_NAMESPACE
1.29 +
1.30 +namespace {
1.31 +
1.32 +class GetFileHelper : public MetadataHelper
1.33 +{
1.34 +public:
1.35 + GetFileHelper(LockedFile* aLockedFile,
1.36 + FileRequest* aFileRequest,
1.37 + MetadataParameters* aParams,
1.38 + FileHandle* aFileHandle)
1.39 + : MetadataHelper(aLockedFile, aFileRequest, aParams),
1.40 + mFileHandle(aFileHandle)
1.41 + { }
1.42 +
1.43 + virtual nsresult
1.44 + GetSuccessResult(JSContext* aCx,
1.45 + JS::MutableHandle<JS::Value> aVal) MOZ_OVERRIDE;
1.46 +
1.47 + virtual void
1.48 + ReleaseObjects() MOZ_OVERRIDE
1.49 + {
1.50 + mFileHandle = nullptr;
1.51 +
1.52 + MetadataHelper::ReleaseObjects();
1.53 + }
1.54 +
1.55 +private:
1.56 + nsRefPtr<FileHandle> mFileHandle;
1.57 +};
1.58 +
1.59 +} // anonymous namespace
1.60 +
1.61 +NS_IMPL_CYCLE_COLLECTION_INHERITED(FileHandle, DOMEventTargetHelper,
1.62 + mFileStorage)
1.63 +
1.64 +NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(FileHandle)
1.65 +NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
1.66 +
1.67 +NS_IMPL_ADDREF_INHERITED(FileHandle, DOMEventTargetHelper)
1.68 +NS_IMPL_RELEASE_INHERITED(FileHandle, DOMEventTargetHelper)
1.69 +
1.70 +// static
1.71 +already_AddRefed<FileHandle>
1.72 +FileHandle::Create(nsPIDOMWindow* aWindow,
1.73 + nsIFileStorage* aFileStorage,
1.74 + nsIFile* aFile)
1.75 +{
1.76 + MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
1.77 +
1.78 + nsRefPtr<FileHandle> newFileHandle = new FileHandle(aWindow);
1.79 +
1.80 + newFileHandle->mFileStorage = aFileStorage;
1.81 + nsresult rv = aFile->GetLeafName(newFileHandle->mName);
1.82 + if (NS_WARN_IF(NS_FAILED(rv))) {
1.83 + return nullptr;
1.84 + }
1.85 +
1.86 + newFileHandle->mFile = aFile;
1.87 + newFileHandle->mFileName = newFileHandle->mName;
1.88 +
1.89 + return newFileHandle.forget();
1.90 +}
1.91 +
1.92 +// virtual
1.93 +already_AddRefed<nsISupports>
1.94 +FileHandle::CreateStream(nsIFile* aFile, bool aReadOnly)
1.95 +{
1.96 + nsresult rv;
1.97 +
1.98 + if (aReadOnly) {
1.99 + nsCOMPtr<nsIInputStream> stream;
1.100 + rv = NS_NewLocalFileInputStream(getter_AddRefs(stream), aFile, -1, -1,
1.101 + nsIFileInputStream::DEFER_OPEN);
1.102 + if (NS_WARN_IF(NS_FAILED(rv))) {
1.103 + return nullptr;
1.104 + }
1.105 + return stream.forget();
1.106 + }
1.107 +
1.108 + nsCOMPtr<nsIFileStream> stream;
1.109 + rv = NS_NewLocalFileStream(getter_AddRefs(stream), aFile, -1, -1,
1.110 + nsIFileStream::DEFER_OPEN);
1.111 + if (NS_WARN_IF(NS_FAILED(rv))) {
1.112 + return nullptr;
1.113 + }
1.114 + return stream.forget();
1.115 +}
1.116 +
1.117 +// virtual
1.118 +already_AddRefed<nsIDOMFile>
1.119 +FileHandle::CreateFileObject(LockedFile* aLockedFile, uint32_t aFileSize)
1.120 +{
1.121 + nsCOMPtr<nsIDOMFile> file =
1.122 + new File(mName, mType, aFileSize, mFile, aLockedFile);
1.123 +
1.124 + return file.forget();
1.125 +}
1.126 +
1.127 +// virtual
1.128 +JSObject*
1.129 +FileHandle::WrapObject(JSContext* aCx)
1.130 +{
1.131 + return FileHandleBinding::Wrap(aCx, this);
1.132 +}
1.133 +
1.134 +already_AddRefed<LockedFile>
1.135 +FileHandle::Open(FileMode aMode, ErrorResult& aError)
1.136 +{
1.137 + MOZ_ASSERT(NS_IsMainThread());
1.138 +
1.139 + if (FileService::IsShuttingDown() || mFileStorage->IsShuttingDown()) {
1.140 + aError.Throw(NS_ERROR_DOM_FILEHANDLE_UNKNOWN_ERR);
1.141 + return nullptr;
1.142 + }
1.143 +
1.144 + nsRefPtr<LockedFile> lockedFile = LockedFile::Create(this, aMode);
1.145 + if (!lockedFile) {
1.146 + aError.Throw(NS_ERROR_DOM_FILEHANDLE_UNKNOWN_ERR);
1.147 + return nullptr;
1.148 + }
1.149 +
1.150 + return lockedFile.forget();
1.151 +}
1.152 +
1.153 +already_AddRefed<DOMRequest>
1.154 +FileHandle::GetFile(ErrorResult& aError)
1.155 +{
1.156 + MOZ_ASSERT(NS_IsMainThread());
1.157 +
1.158 + // Do nothing if the window is closed
1.159 + if (!GetOwner()) {
1.160 + return nullptr;
1.161 + }
1.162 +
1.163 + nsRefPtr<LockedFile> lockedFile =
1.164 + LockedFile::Create(this, FileMode::Readonly, LockedFile::PARALLEL);
1.165 + if (!lockedFile) {
1.166 + aError.Throw(NS_ERROR_DOM_FILEHANDLE_UNKNOWN_ERR);
1.167 + return nullptr;
1.168 + }
1.169 +
1.170 + nsRefPtr<FileRequest> request =
1.171 + FileRequest::Create(GetOwner(), lockedFile, /* aWrapAsDOMRequest */ true);
1.172 +
1.173 + nsRefPtr<MetadataParameters> params = new MetadataParameters(true, false);
1.174 +
1.175 + nsRefPtr<GetFileHelper> helper =
1.176 + new GetFileHelper(lockedFile, request, params, this);
1.177 +
1.178 + nsresult rv = helper->Enqueue();
1.179 + if (NS_FAILED(rv)) {
1.180 + aError.Throw(NS_ERROR_DOM_FILEHANDLE_UNKNOWN_ERR);
1.181 + return nullptr;
1.182 + }
1.183 +
1.184 + return request.forget();
1.185 +}
1.186 +
1.187 +nsresult
1.188 +GetFileHelper::GetSuccessResult(JSContext* aCx,
1.189 + JS::MutableHandle<JS::Value> aVal)
1.190 +{
1.191 + nsCOMPtr<nsIDOMFile> domFile =
1.192 + mFileHandle->CreateFileObject(mLockedFile, mParams->Size());
1.193 +
1.194 + nsresult rv =
1.195 + nsContentUtils::WrapNative(aCx, domFile, &NS_GET_IID(nsIDOMFile), aVal);
1.196 + NS_ENSURE_SUCCESS(rv, NS_ERROR_DOM_FILEHANDLE_UNKNOWN_ERR);
1.197 + return NS_OK;
1.198 +}
