//* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* 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 nsCheckSummedOutputStream_h__

#define nsCheckSummedOutputStream_h__

#include "nsIFile.h"

#include "nsIOutputStream.h"

#include "nsICryptoHash.h"

#include "nsNetCID.h"

#include "nsString.h"

#include "nsToolkitCompsCID.h"

#include "../../../netwerk/base/nsBufferedStreams.h"

#include "prio.h"

class nsCheckSummedOutputStream : public nsBufferedOutputStream

{

public:

  NS_DECL_ISUPPORTS_INHERITED

  // Size of MD5 hash in bytes

  static const uint32_t CHECKSUM_SIZE = 16;

  static const uint32_t MAX_BUFFER_SIZE = 64 * 1024;

  nsCheckSummedOutputStream() {}

  NS_IMETHOD Finish() override;

  NS_IMETHOD Write(const char *buf, uint32_t count, uint32_t *result) override;

  NS_IMETHOD Init(nsIOutputStream* stream, uint32_t bufferSize) override;

protected:

  virtual ~nsCheckSummedOutputStream() { nsBufferedOutputStream::Close(); }

  nsCOMPtr<nsICryptoHash> mHash;

  nsCString mCheckSum;

};

// returns a file output stream which can be QI'ed to nsIFileOutputStream.

inline nsresult

NS_NewCheckSummedOutputStream(nsIOutputStream **result,

                              nsIFile         *file)

{

    nsCOMPtr<nsIOutputStream> localOutFile;

    nsresult rv = NS_NewSafeLocalFileOutputStream(getter_AddRefs(localOutFile), file,

                                                  PR_WRONLY | PR_TRUNCATE | PR_CREATE_FILE);

    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsIBufferedOutputStream> out = new nsCheckSummedOutputStream();

    rv = out->Init(localOutFile, nsCheckSummedOutputStream::CHECKSUM_SIZE);

    if (NS_SUCCEEDED(rv)) {

      out.forget(result);

    }

    return rv;

}

#endif