dom/file/MetadataHelper.cpp@ac0c01689b40 (annotated)
dom/file/MetadataHelper.cpp
Thu, 15 Jan 2015 15:59:08 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 15 Jan 2015 15:59:08 +0100
- branch
- TOR_BUG_9701
- changeset 10
- ac0c01689b40
- permissions
- -rw-r--r--
Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* vim: set ts=2 et sw=2 tw=80: */ |
| michael@0 | 3 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this file, |
| michael@0 | 5 | * You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | |
| michael@0 | 7 | #include "MetadataHelper.h" |
| michael@0 | 8 | |
| michael@0 | 9 | #include "LockedFile.h" |
| michael@0 | 10 | |
| michael@0 | 11 | USING_FILE_NAMESPACE |
| michael@0 | 12 | |
| michael@0 | 13 | nsresult |
| michael@0 | 14 | MetadataHelper::DoAsyncRun(nsISupports* aStream) |
| michael@0 | 15 | { |
| michael@0 | 16 | bool readWrite = mLockedFile->mMode == FileMode::Readwrite; |
| michael@0 | 17 | |
| michael@0 | 18 | nsRefPtr<AsyncMetadataGetter> getter = |
| michael@0 | 19 | new AsyncMetadataGetter(aStream, mParams, readWrite); |
| michael@0 | 20 | |
| michael@0 | 21 | nsresult rv = getter->AsyncWork(this, nullptr); |
| michael@0 | 22 | NS_ENSURE_SUCCESS(rv, rv); |
| michael@0 | 23 | |
| michael@0 | 24 | return NS_OK; |
| michael@0 | 25 | } |
| michael@0 | 26 | |
| michael@0 | 27 | nsresult |
| michael@0 | 28 | MetadataHelper::GetSuccessResult(JSContext* aCx, |
| michael@0 | 29 | JS::MutableHandle<JS::Value> aVal) |
| michael@0 | 30 | { |
| michael@0 | 31 | JS::Rooted<JSObject*> obj(aCx, JS_NewObject(aCx, nullptr, JS::NullPtr(), |
| michael@0 | 32 | JS::NullPtr())); |
| michael@0 | 33 | NS_ENSURE_TRUE(obj, NS_ERROR_OUT_OF_MEMORY); |
| michael@0 | 34 | |
| michael@0 | 35 | if (mParams->SizeRequested()) { |
| michael@0 | 36 | JS::Rooted<JS::Value> val(aCx, JS_NumberValue(mParams->Size())); |
| michael@0 | 37 | |
| michael@0 | 38 | if (!JS_DefineProperty(aCx, obj, "size", val, JSPROP_ENUMERATE)) { |
| michael@0 | 39 | return NS_ERROR_FAILURE; |
| michael@0 | 40 | } |
| michael@0 | 41 | } |
| michael@0 | 42 | |
| michael@0 | 43 | if (mParams->LastModifiedRequested()) { |
| michael@0 | 44 | double msec = mParams->LastModified(); |
| michael@0 | 45 | JSObject *date = JS_NewDateObjectMsec(aCx, msec); |
| michael@0 | 46 | NS_ENSURE_TRUE(date, NS_ERROR_OUT_OF_MEMORY); |
| michael@0 | 47 | |
| michael@0 | 48 | JS::Rooted<JS::Value> dateRoot(aCx, JS::ObjectValue(*date)); |
| michael@0 | 49 | if (!JS_DefineProperty(aCx, obj, "lastModified", dateRoot, |
| michael@0 | 50 | JSPROP_ENUMERATE)) { |
| michael@0 | 51 | return NS_ERROR_FAILURE; |
| michael@0 | 52 | } |
| michael@0 | 53 | } |
| michael@0 | 54 | |
| michael@0 | 55 | aVal.setObject(*obj); |
| michael@0 | 56 | return NS_OK; |
| michael@0 | 57 | } |
| michael@0 | 58 | |
| michael@0 | 59 | nsresult |
| michael@0 | 60 | MetadataHelper::AsyncMetadataGetter::DoStreamWork(nsISupports* aStream) |
| michael@0 | 61 | { |
| michael@0 | 62 | nsresult rv; |
| michael@0 | 63 | |
| michael@0 | 64 | if (mReadWrite) { |
| michael@0 | 65 | // Force a flush (so all pending writes are flushed to the disk and file |
| michael@0 | 66 | // metadata is updated too). |
| michael@0 | 67 | |
| michael@0 | 68 | nsCOMPtr<nsIOutputStream> ostream = do_QueryInterface(aStream); |
| michael@0 | 69 | NS_ASSERTION(ostream, "This should always succeed!"); |
| michael@0 | 70 | |
| michael@0 | 71 | rv = ostream->Flush(); |
| michael@0 | 72 | NS_ENSURE_SUCCESS(rv, rv); |
| michael@0 | 73 | } |
| michael@0 | 74 | |
| michael@0 | 75 | nsCOMPtr<nsIFileMetadata> metadata = do_QueryInterface(aStream); |
| michael@0 | 76 | |
| michael@0 | 77 | if (mParams->SizeRequested()) { |
| michael@0 | 78 | int64_t size; |
| michael@0 | 79 | rv = metadata->GetSize(&size); |
| michael@0 | 80 | NS_ENSURE_SUCCESS(rv, rv); |
| michael@0 | 81 | |
| michael@0 | 82 | NS_ENSURE_TRUE(size >= 0, NS_ERROR_FAILURE); |
| michael@0 | 83 | |
| michael@0 | 84 | mParams->mSize = uint64_t(size); |
| michael@0 | 85 | } |
| michael@0 | 86 | |
| michael@0 | 87 | if (mParams->LastModifiedRequested()) { |
| michael@0 | 88 | int64_t lastModified; |
| michael@0 | 89 | rv = metadata->GetLastModified(&lastModified); |
| michael@0 | 90 | NS_ENSURE_SUCCESS(rv, rv); |
| michael@0 | 91 | |
| michael@0 | 92 | mParams->mLastModified = lastModified; |
| michael@0 | 93 | } |
| michael@0 | 94 | |
| michael@0 | 95 | return NS_OK; |
| michael@0 | 96 | } |
