dom/filehandle/MetadataHelper.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   5  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "MetadataHelper.h"
   8
   9 #include "FileHandle.h"
  10 #include "js/Value.h"
  11 #include "js/RootingAPI.h"
  12 #include "jsapi.h"
  13 #include "mozilla/dom/FileModeBinding.h"
  14 #include "nsDebug.h"
  15 #include "nsIFileStreams.h"
  16 #include "nsIOutputStream.h"
  17
  18 namespace mozilla {
  19 namespace dom {
  20
  21 nsresult
  22 MetadataHelper::DoAsyncRun(nsISupports* aStream)
  23 {
  24   bool readWrite = mFileHandle->mMode == FileMode::Readwrite;
  25
  26   nsRefPtr<AsyncMetadataGetter> getter =
  27     new AsyncMetadataGetter(aStream, mParams, readWrite);
  28
  29   nsresult rv = getter->AsyncWork(this, nullptr);
  30   NS_ENSURE_SUCCESS(rv, rv);
  31
  32   return NS_OK;
  33 }
  34
  35 nsresult
  36 MetadataHelper::GetSuccessResult(JSContext* aCx,
  37                                  JS::MutableHandle<JS::Value> aVal)
  38 {
  39   JS::Rooted<JSObject*> obj(aCx, JS_NewObject(aCx, nullptr, JS::NullPtr(),
  40                                               JS::NullPtr()));
  41   NS_ENSURE_TRUE(obj, NS_ERROR_OUT_OF_MEMORY);
  42
  43   if (mParams->SizeRequested()) {
  44     JS::Rooted<JS::Value> val(aCx, JS_NumberValue(mParams->Size()));
  45
  46     if (!JS_DefineProperty(aCx, obj, "size", val, JSPROP_ENUMERATE)) {
  47       return NS_ERROR_FAILURE;
  48     }
  49   }
  50
  51   if (mParams->LastModifiedRequested()) {
  52     double msec = mParams->LastModified();
  53     JSObject *date = JS_NewDateObjectMsec(aCx, msec);
  54     NS_ENSURE_TRUE(date, NS_ERROR_OUT_OF_MEMORY);
  55
  56     JS::Rooted<JS::Value> dateRoot(aCx, JS::ObjectValue(*date));
  57     if (!JS_DefineProperty(aCx, obj, "lastModified", dateRoot,
  58                            JSPROP_ENUMERATE)) {
  59       return NS_ERROR_FAILURE;
  60     }
  61   }
  62
  63   aVal.setObject(*obj);
  64   return NS_OK;
  65 }
  66
  67 nsresult
  68 MetadataHelper::AsyncMetadataGetter::DoStreamWork(nsISupports* aStream)
  69 {
  70   nsresult rv;
  71
  72   if (mReadWrite) {
  73     // Force a flush (so all pending writes are flushed to the disk and file
  74     // metadata is updated too).
  75
  76     nsCOMPtr<nsIOutputStream> ostream = do_QueryInterface(aStream);
  77     NS_ASSERTION(ostream, "This should always succeed!");
  78
  79     rv = ostream->Flush();
  80     NS_ENSURE_SUCCESS(rv, rv);
  81   }
  82
  83   nsCOMPtr<nsIFileMetadata> metadata = do_QueryInterface(aStream);
  84
  85   if (mParams->SizeRequested()) {
  86     int64_t size;
  87     rv = metadata->GetSize(&size);
  88     NS_ENSURE_SUCCESS(rv, rv);
  89
  90     NS_ENSURE_TRUE(size >= 0, NS_ERROR_FAILURE);
  91
  92     mParams->mSize = uint64_t(size);
  93   }
  94
  95   if (mParams->LastModifiedRequested()) {
  96     int64_t lastModified;
  97     rv = metadata->GetLastModified(&lastModified);
  98     NS_ENSURE_SUCCESS(rv, rv);
  99
 100     mParams->mLastModified = lastModified;
 101   }
 102
 103   return NS_OK;
 104 }
 105
 106 } // namespace dom
 107 } // namespace mozilla