http://www.ousob.com --- Legacy Redefined OuSob - File: /wwwroot/clipx/usr/include/wvstreams/wvgzip.h

/* -*- Mode: C++ -*- * Worldvisions Weaver Software: * Copyright (C) 1997-2002 Net Integration Technologies, Inc. * * Gzip encoder/decoder based on zlib. */ #ifndef __WVGZIP_H #define __WVGZIP_H #include "wvencoder.h" #include "wvencoderstream.h" struct z_stream_s; /** * An encoder implementing Gzip encryption and decryption. * * When compressing: * * - On flush(), the encoded data stream is synchronized such that * all data compressed up to this point can be fully decompressed. * * - On finish(), the encoded data stream is finalized an a Gzip * end of data marker is emitted. * * * When decompressing: * * - The encoder will transition to isfinished() == true on its own * if a Gzip end of data marker is detected in the input. After * this point, no additional data can be decompressed. * * */ class WvGzipEncoder : public WvEncoder { public: enum Mode { Deflate, /*!< Compress using deflate */ Inflate /*!< Decompress using inflate */ }; /** * Creates a Gzip encoder. * * "mode" is the compression mode */ WvGzipEncoder(Mode mode, size_t _out_limit = 0); virtual ~WvGzipEncoder(); /** * Limit the amount of output produced in one call to encode(). * Defaults to 0, meaning no limit (empty the input buffer). */ size_t out_limit; /** * Continue decompression if errors are found. * If true, upon running into a decompression error, the encoder will * seek to the next unbroken block. Most useful if at least some blocks * are fully flushed (see 'full_flush' below). Defaults to false. */ bool ignore_decompression_errors; /** * Do full flushes. * Makes the encoder use Z_FULL_FLUSH instead of Z_SYNC_FLUSH, which * resets the compression state to improve chances of recovering * corrupted compressed data. Degrades compression, so don't use it too * often. Defaults to false. */ bool full_flush; protected: virtual bool _encode(WvBuf &inbuf, WvBuf &outbuf, bool flush); virtual bool _finish(WvBuf &outbuf); virtual bool _reset(); private: struct z_stream_s *zstr; WvInPlaceBuf tmpbuf; Mode mode; size_t output; void init(); void close(); void prepare(WvBuf *inbuf); bool process(WvBuf &outbuf, bool flush, bool finish); }; #endif // __WVGZIP_H