nsCheckSummedOutputStream.h

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//* -*- 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 "nsNetUtil.h"

#include "nsString.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() = default;

  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::MAX_BUFFER_SIZE);

  if (NS_SUCCEEDED(rv)) {

    out.forget(result);

  return rv;

class nsCrc32CheckSumedOutputStream : public nsBufferedOutputStream {

 public:

  NS_DECL_ISUPPORTS_INHERITED

  static const uint32_t CHECKSUM_SIZE = 4;

  nsCrc32CheckSumedOutputStream() = default;

  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 ~nsCrc32CheckSumedOutputStream() { nsBufferedOutputStream::Close(); }

  uint32_t mCheckSum;

};

inline nsresult NS_NewCrc32OutputStream(

    nsIOutputStream** aResult, already_AddRefed<nsIOutputStream> aOutput,

    uint32_t aBufferSize) {

  nsCOMPtr<nsIOutputStream> out = std::move(aOutput);

  nsCOMPtr<nsIBufferedOutputStream> bufferOutput =

      new nsCrc32CheckSumedOutputStream();

  nsresult rv = bufferOutput->Init(out, aBufferSize);

  if (NS_SUCCEEDED(rv)) {

    bufferOutput.forget(aResult);

  return rv;

#endif