Page Speed Optimization Libraries  1.2.24.1
net/instaweb/util/public/gzip_inflater.h
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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 
00025 typedef struct z_stream_s z_stream;
00026 
00027 namespace net_instaweb {
00028 
00029 class GzipInflater {
00030  public:
00031   enum InflateType {kGzip, kDeflate};
00032 
00033   explicit GzipInflater(InflateType type);
00034   ~GzipInflater();
00035 
00037   bool Init();
00038 
00040   void ShutDown();
00041 
00045   bool HasUnconsumedInput() const;
00046 
00052   bool SetInput(const void *in, size_t in_size);
00053 
00058   int InflateBytes(char *buf, size_t buf_size);
00059 
00061   bool finished() const { return finished_; }
00062 
00064   bool error() const { return error_; }
00065 
00066  private:
00067   friend class GzipInflaterTestPeer;
00068 
00069   enum StreamFormat {
00070     FORMAT_GZIP,         
00071     FORMAT_ZLIB_STREAM,  
00072     FORMAT_RAW_INFLATE,  
00073   };
00074 
00075   static bool GetWindowBitsForFormat(
00076       StreamFormat format, int* out_window_bits);
00077   void Free();
00078   void SetInputInternal(const void *in, size_t in_size);
00079   void SwitchToRawDeflateFormat();
00080 
00081   z_stream *zlib_;
00082   StreamFormat format_;
00083   bool finished_;
00084   bool error_;
00085 
00086   DISALLOW_COPY_AND_ASSIGN(GzipInflater);
00087 };
00088 
00089 }  
00090 
00091 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_GZIP_INFLATER_H_
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