gecko-dev/dom/file/MetadataHelper.cpp

97 строки
2.5 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 "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, nullptr);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
MetadataHelper::GetSuccessResult(JSContext* aCx,
jsval* aVal)
{
JSObject* obj = JS_NewObject(aCx, nullptr, nullptr, nullptr);
NS_ENSURE_TRUE(obj, NS_ERROR_OUT_OF_MEMORY);
if (mParams->SizeRequested()) {
jsval val = JS_NumberValue(mParams->Size());
if (!JS_DefineProperty(aCx, obj, "size", val, nullptr, nullptr,
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),
nullptr, nullptr, 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;
}