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// Protocol Buffers - Google's data interchange format // Copyright 2008 Google Inc. All rights reserved. // https://developers.google.com/protocol-buffers/ // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following disclaimer // in the documentation and/or other materials provided with the // distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived from // this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. // Author: [email protected] (Brian Olson) // // This file contains the definition for classes GzipInputStream and // GzipOutputStream. // // GzipInputStream decompresses data from an underlying // ZeroCopyInputStream and provides the decompressed data as a // ZeroCopyInputStream. // // GzipOutputStream is an ZeroCopyOutputStream that compresses data to // an underlying ZeroCopyOutputStream. #ifndef GOOGLE_PROTOBUF_IO_GZIP_STREAM_H__ #define GOOGLE_PROTOBUF_IO_GZIP_STREAM_H__ #include <zlib.h> #include <google/protobuf/stubs/common.h> #include <google/protobuf/io/zero_copy_stream.h> namespace google { namespace protobuf { namespace io { // A ZeroCopyInputStream that reads compressed data through zlib class LIBPROTOBUF_EXPORT GzipInputStream : public ZeroCopyInputStream { public: // Format key for constructor enum Format { // zlib will autodetect gzip header or deflate stream AUTO = 0, // GZIP streams have some extra header data for file attributes. GZIP = 1, // Simpler zlib stream format. ZLIB = 2, }; // buffer_size and format may be -1 for default of 64kB and GZIP format explicit GzipInputStream( ZeroCopyInputStream* sub_stream, Format format = AUTO, int buffer_size = -1); virtual ~GzipInputStream(); // Return last error message or NULL if no error. inline const char* ZlibErrorMessage() const { return zcontext_.msg; } inline int ZlibErrorCode() const { return zerror_; } // implements ZeroCopyInputStream ---------------------------------- bool Next(const void** data, int* size); void BackUp(int count); bool Skip(int count); int64 ByteCount() const; private: Format format_; ZeroCopyInputStream* sub_stream_; z_stream zcontext_; int zerror_; void* output_buffer_; void* output_position_; size_t output_buffer_length_; int Inflate(int flush); void DoNextOutput(const void** data, int* size); GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(GzipInputStream); }; class LIBPROTOBUF_EXPORT GzipOutputStream : public ZeroCopyOutputStream { public: // Format key for constructor enum Format { // GZIP streams have some extra header data for file attributes. GZIP = 1, // Simpler zlib stream format. ZLIB = 2, }; struct Options { // Defaults to GZIP. Format format; // What size buffer to use internally. Defaults to 64kB. int buffer_size; // A number between 0 and 9, where 0 is no compression and 9 is best // compression. Defaults to Z_DEFAULT_COMPRESSION (see zlib.h). int compression_level; // Defaults to Z_DEFAULT_STRATEGY. Can also be set to Z_FILTERED, // Z_HUFFMAN_ONLY, or Z_RLE. See the documentation for deflateInit2 in // zlib.h for definitions of these constants. int compression_strategy; Options(); // Initializes with default values. }; // Create a GzipOutputStream with default options. explicit GzipOutputStream(ZeroCopyOutputStream* sub_stream); // Create a GzipOutputStream with the given options. GzipOutputStream( ZeroCopyOutputStream* sub_stream, const Options& options); virtual ~GzipOutputStream(); // Return last error message or NULL if no error. inline const char* ZlibErrorMessage() const { return zcontext_.msg; } inline int ZlibErrorCode() const { return zerror_; } // Flushes data written so far to zipped data in the underlying stream. // It is the caller's responsibility to flush the underlying stream if // necessary. // Compression may be less efficient stopping and starting around flushes. // Returns true if no error. // // Please ensure that block size is > 6. Here is an excerpt from the zlib // doc that explains why: // // In the case of a Z_FULL_FLUSH or Z_SYNC_FLUSH, make sure that avail_out // is greater than six to avoid repeated flush markers due to // avail_out == 0 on return. bool Flush(); // Writes out all data and closes the gzip stream. // It is the caller's responsibility to close the underlying stream if // necessary. // Returns true if no error. bool Close(); // implements ZeroCopyOutputStream --------------------------------- bool Next(void** data, int* size); void BackUp(int count); int64 ByteCount() const; private: ZeroCopyOutputStream* sub_stream_; // Result from calling Next() on sub_stream_ void* sub_data_; int sub_data_size_; z_stream zcontext_; int zerror_; void* input_buffer_; size_t input_buffer_length_; // Shared constructor code. void Init(ZeroCopyOutputStream* sub_stream, const Options& options); // Do some compression. // Takes zlib flush mode. // Returns zlib error code. int Deflate(int flush); GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(GzipOutputStream); }; } // namespace io } // namespace protobuf } // namespace google #endif // GOOGLE_PROTOBUF_IO_GZIP_STREAM_H__