nsDeflateConverter.h

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/* 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 _nsDeflateConverter_h_

#define _nsDeflateConverter_h_

#include "nsIStreamConverter.h"

#include "nsCOMPtr.h"

#include "nsIThreadRetargetableStreamListener.h"

#include "zlib.h"

#include "mozilla/Attributes.h"

#define DEFLATECONVERTER_CID                         \

  {                                                  \

    0x461cd5dd, 0x73c6, 0x47a4, {                    \

      0x8c, 0xc3, 0x60, 0x3b, 0x37, 0xd8, 0x4a, 0x61 \

    }                                                \

class nsDeflateConverter final : public nsIStreamConverter {

 public:

  static constexpr size_t kZipBufLen = (4 * 1024 - 1);

  NS_DECL_ISUPPORTS

  NS_DECL_NSIREQUESTOBSERVER

  NS_DECL_NSISTREAMLISTENER

  NS_DECL_NSITHREADRETARGETABLESTREAMLISTENER

  NS_DECL_NSISTREAMCONVERTER

  nsDeflateConverter() : mWrapMode(WRAP_NONE), mOffset(0), mZstream() {

    // 6 is Z_DEFAULT_COMPRESSION but we need the actual value

    mLevel = 6;

  explicit nsDeflateConverter(int32_t level)

      : mWrapMode(WRAP_NONE), mOffset(0), mZstream() {

    mLevel = level;

 private:

  ~nsDeflateConverter() {}

  enum WrapMode { WRAP_ZLIB, WRAP_GZIP, WRAP_NONE };

  WrapMode mWrapMode;

  uint64_t mOffset;

  int32_t mLevel;

  nsCOMPtr<nsIStreamListener> mListener;

  nsCOMPtr<nsISupports> mContext;

  z_stream mZstream;

  unsigned char mWriteBuffer[kZipBufLen];

  nsresult Init();

  nsresult PushAvailableData(nsIRequest* aRequest);

};

#endif