Page Speed Optimization Libraries
1.2.24.1
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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_