1 /* This Source Code Form is subject to the terms of the Mozilla Public 2 * License, v. 2.0. If a copy of the MPL was not distributed with this 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. 4 */ 5 6 #ifndef _nsDeflateConverter_h_ 7 #define _nsDeflateConverter_h_ 8 9 #include "nsIStreamConverter.h" 10 #include "nsCOMPtr.h" 11 #include "zlib.h" 12 #include "mozilla/Attributes.h" 13 14 #define DEFLATECONVERTER_CID \ 15 { \ 16 0x461cd5dd, 0x73c6, 0x47a4, { \ 17 0x8c, 0xc3, 0x60, 0x3b, 0x37, 0xd8, 0x4a, 0x61 \ 18 } \ 19 } 20 21 class nsDeflateConverter final : public nsIStreamConverter { 22 public: 23 static constexpr size_t kZipBufLen = (4 * 1024 - 1); 24 25 NS_DECL_ISUPPORTS 26 NS_DECL_NSIREQUESTOBSERVER 27 NS_DECL_NSISTREAMLISTENER 28 NS_DECL_NSISTREAMCONVERTER 29 nsDeflateConverter()30 nsDeflateConverter() : mWrapMode(WRAP_NONE), mOffset(0), mZstream() { 31 // 6 is Z_DEFAULT_COMPRESSION but we need the actual value 32 mLevel = 6; 33 } 34 nsDeflateConverter(int32_t level)35 explicit nsDeflateConverter(int32_t level) 36 : mWrapMode(WRAP_NONE), mOffset(0), mZstream() { 37 mLevel = level; 38 } 39 40 private: ~nsDeflateConverter()41 ~nsDeflateConverter() {} 42 43 enum WrapMode { WRAP_ZLIB, WRAP_GZIP, WRAP_NONE }; 44 45 WrapMode mWrapMode; 46 uint64_t mOffset; 47 int32_t mLevel; 48 nsCOMPtr<nsIStreamListener> mListener; 49 nsCOMPtr<nsISupports> mContext; 50 z_stream mZstream; 51 unsigned char mWriteBuffer[kZipBufLen]; 52 53 nsresult Init(); 54 nsresult PushAvailableData(nsIRequest* aRequest); 55 }; 56 57 #endif 58