gecko/dom/indexedDB/FileStream.h
2012-07-30 17:20:58 +03:00

141 lines
2.9 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/. */
#ifndef mozilla_dom_indexeddb_filestream_h__
#define mozilla_dom_indexeddb_filestream_h__
#include "IndexedDatabase.h"
#include "nsIFileStreams.h"
#include "nsIInputStream.h"
#include "nsIOutputStream.h"
#include "nsISeekableStream.h"
#include "nsIStandardFileStream.h"
class nsIFile;
struct quota_FILE;
BEGIN_INDEXEDDB_NAMESPACE
class FileStream : public nsISeekableStream,
public nsIInputStream,
public nsIOutputStream,
public nsIStandardFileStream,
public nsIFileMetadata
{
public:
FileStream()
: mFlags(0),
mDeferredOpen(false),
mQuotaFile(nullptr)
{ }
virtual ~FileStream()
{
Close();
}
NS_DECL_ISUPPORTS
NS_DECL_NSISEEKABLESTREAM
NS_DECL_NSISTANDARDFILESTREAM
NS_DECL_NSIFILEMETADATA
// nsIInputStream
NS_IMETHOD
Close();
NS_IMETHOD
Available(PRUint32* _retval);
NS_IMETHOD
Read(char* aBuf, PRUint32 aCount, PRUint32* _retval);
NS_IMETHOD
ReadSegments(nsWriteSegmentFun aWriter, void* aClosure, PRUint32 aCount,
PRUint32* _retval);
NS_IMETHOD
IsNonBlocking(bool* _retval);
// nsIOutputStream
// Close() already declared
NS_IMETHOD
Flush();
NS_IMETHOD
Write(const char* aBuf, PRUint32 aCount, PRUint32* _retval);
NS_IMETHOD
WriteFrom(nsIInputStream* aFromStream, PRUint32 aCount, PRUint32* _retval);
NS_IMETHOD
WriteSegments(nsReadSegmentFun aReader, void* aClosure, PRUint32 aCount,
PRUint32* _retval);
// IsNonBlocking() already declared
protected:
/**
* Cleans up data prepared in Init.
*/
void
CleanUpOpen()
{
mFilePath.Truncate();
mDeferredOpen = false;
}
/**
* Open the file. This is called either from Init
* or from DoPendingOpen (if FLAGS_DEFER_OPEN is used when initializing this
* stream). The default behavior of DoOpen is to open the file and save the
* file descriptor.
*/
virtual nsresult
DoOpen();
/**
* If there is a pending open, do it now. It's important for this to be
* inlined since we do it in almost every stream API call.
*/
nsresult
DoPendingOpen()
{
if (!mDeferredOpen) {
return NS_OK;
}
return DoOpen();
}
/**
* Data we need to do an open.
*/
nsString mFilePath;
nsString mMode;
/**
* Flags describing our behavior. See the IDL file for possible values.
*/
PRInt32 mFlags;
/**
* Whether we have a pending open (see FLAGS_DEFER_OPEN in the IDL file).
*/
bool mDeferredOpen;
/**
* File descriptor for opened file.
*/
quota_FILE* mQuotaFile;
};
END_INDEXEDDB_NAMESPACE
#endif // mozilla_dom_indexeddb_filestream_h__