Page Speed Optimization Libraries  1.6.29.3
net/instaweb/util/public/gzip_inflater.h
Go to the documentation of this file.
00001 /*
00002  * Copyright 2010 Google Inc.
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *      http:///www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00018 
00019 #ifndef NET_INSTAWEB_UTIL_PUBLIC_GZIP_INFLATER_H_
00020 #define NET_INSTAWEB_UTIL_PUBLIC_GZIP_INFLATER_H_
00021 
00022 #include <cstddef>
00023 #include "net/instaweb/util/public/basictypes.h"
00024 #include "net/instaweb/util/public/string_util.h"
00025 
00026 typedef struct z_stream_s z_stream;
00027 
00028 namespace net_instaweb {
00029 
00030 class Writer;
00031 
00032 class GzipInflater {
00033  public:
00034   enum InflateType {kGzip, kDeflate};
00035 
00036   explicit GzipInflater(InflateType type);
00037   ~GzipInflater();
00038 
00040   bool Init();
00041 
00043   void ShutDown();
00044 
00048   bool HasUnconsumedInput() const;
00049 
00055   bool SetInput(const void *in, size_t in_size);
00056 
00061   int InflateBytes(char *buf, size_t buf_size);
00062 
00064   bool finished() const { return finished_; }
00065 
00067   bool error() const { return error_; }
00068 
00071   static bool Deflate(StringPiece in, Writer* writer);
00072 
00075   static bool Inflate(StringPiece in, Writer* writer);
00076 
00077  private:
00078   friend class GzipInflaterTestPeer;
00079 
00080   enum StreamFormat {
00081     FORMAT_GZIP,         
00082     FORMAT_ZLIB_STREAM,  
00083     FORMAT_RAW_INFLATE,  
00084   };
00085 
00086   static bool GetWindowBitsForFormat(
00087       StreamFormat format, int* out_window_bits);
00088   void Free();
00089   void SetInputInternal(const void *in, size_t in_size);
00090   void SwitchToRawDeflateFormat();
00091 
00092   z_stream *zlib_;
00093   StreamFormat format_;
00094   bool finished_;
00095   bool error_;
00096 
00097   DISALLOW_COPY_AND_ASSIGN(GzipInflater);
00098 };
00099 
00100 }  
00101 
00102 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_GZIP_INFLATER_H_
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Defines