gecko-dev/dom/filehandle/MetadataHelper.cpp

107 lines
2.7 KiB
C++

/* -*- 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 "FileHandle.h"
#include "js/Value.h"
#include "js/RootingAPI.h"
#include "jsapi.h"
#include "mozilla/dom/FileModeBinding.h"
#include "nsDebug.h"
#include "nsIFileStreams.h"
#include "nsIOutputStream.h"
namespace mozilla {
namespace dom {
nsresult
MetadataHelper::DoAsyncRun(nsISupports* aStream)
{
bool readWrite = mFileHandle->mMode == FileMode::Readwrite;
nsRefPtr<AsyncMetadataGetter> getter =
new AsyncMetadataGetter(aStream, mParams, readWrite);
nsresult rv = getter->AsyncWork(this, nullptr);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
MetadataHelper::GetSuccessResult(JSContext* aCx,
JS::MutableHandle<JS::Value> aVal)
{
JS::Rooted<JSObject*> obj(aCx, JS_NewPlainObject(aCx));
NS_ENSURE_TRUE(obj, NS_ERROR_OUT_OF_MEMORY);
if (mParams->SizeRequested()) {
JS::Rooted<JS::Value> val(aCx, JS_NumberValue(mParams->Size()));
if (!JS_DefineProperty(aCx, obj, "size", val, 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);
JS::Rooted<JS::Value> dateRoot(aCx, JS::ObjectValue(*date));
if (!JS_DefineProperty(aCx, obj, "lastModified", dateRoot,
JSPROP_ENUMERATE)) {
return NS_ERROR_FAILURE;
}
}
aVal.setObject(*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()) {
int64_t size;
rv = metadata->GetSize(&size);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(size >= 0, NS_ERROR_FAILURE);
mParams->mSize = uint64_t(size);
}
if (mParams->LastModifiedRequested()) {
int64_t lastModified;
rv = metadata->GetLastModified(&lastModified);
NS_ENSURE_SUCCESS(rv, rv);
mParams->mLastModified = lastModified;
}
return NS_OK;
}
} // namespace dom
} // namespace mozilla