gecko/dom/file/MetadataHelper.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "MetadataHelper.h"

#include "LockedFile.h"

USING_FILE_NAMESPACE

nsresult
MetadataHelper::DoAsyncRun(nsISupports* aStream)
{
  bool readWrite = mLockedFile->mMode == LockedFile::READ_WRITE;

  nsRefPtr<AsyncMetadataGetter> getter =
    new AsyncMetadataGetter(aStream, mParams, readWrite);

  nsresult rv = getter->AsyncWork(this, nsnull);
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}

nsresult
MetadataHelper::GetSuccessResult(JSContext* aCx,
                                 jsval* aVal)
{
  JSObject* obj = JS_NewObject(aCx, nsnull, nsnull, nsnull);
  NS_ENSURE_TRUE(obj, NS_ERROR_OUT_OF_MEMORY);

  if (mParams->SizeRequested()) {
    jsval val;

    if (mParams->Size() <= JSVAL_INT_MAX) {
      val = INT_TO_JSVAL(mParams->Size());
    }
    else {
      double size = mParams->Size();
      if (!JS_NewNumberValue(aCx, size, &val)) {
        return NS_ERROR_FAILURE;
      }
    }

    if (!JS_DefineProperty(aCx, obj, "size", val, nsnull, nsnull,
                           JSPROP_ENUMERATE)) {
      return NS_ERROR_FAILURE;
    }
  }

  if (mParams->LastModifiedRequested()) {
    double msec = mParams->LastModified();
    JSObject *date = JS_NewDateObjectMsec(aCx, msec);
    NS_ENSURE_TRUE(date, NS_ERROR_OUT_OF_MEMORY);

    if (!JS_DefineProperty(aCx, obj, "lastModified", OBJECT_TO_JSVAL(date),
                           nsnull, nsnull, JSPROP_ENUMERATE)) {
      return NS_ERROR_FAILURE;
    }
  }

  *aVal = OBJECT_TO_JSVAL(obj);

  return NS_OK;
}

nsresult
MetadataHelper::AsyncMetadataGetter::DoStreamWork(nsISupports* aStream)
{
  nsresult rv;

  if (mReadWrite) {
    // Force a flush (so all pending writes are flushed to the disk and file
    // metadata is updated too).

    nsCOMPtr<nsIOutputStream> ostream = do_QueryInterface(aStream);
    NS_ASSERTION(ostream, "This should always succeed!");

    rv = ostream->Flush();
    NS_ENSURE_SUCCESS(rv, rv);
  }

  nsCOMPtr<nsIFileMetadata> metadata = do_QueryInterface(aStream);

  if (mParams->SizeRequested()) {
    PRInt64 size;
    rv = metadata->GetSize(&size);
    NS_ENSURE_SUCCESS(rv, rv);

    NS_ENSURE_TRUE(size >= 0, NS_ERROR_FAILURE);

    mParams->mSize = PRUint64(size);
  }

  if (mParams->LastModifiedRequested()) {
    PRInt64 lastModified;
    rv = metadata->GetLastModified(&lastModified);
    NS_ENSURE_SUCCESS(rv, rv);

    mParams->mLastModified = lastModified;
  }

  return NS_OK;
}