/usr/include/wvstreams/wvgzip.h is in libwvstreams-dev 4.6.1-12~deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 | /* -*- 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.
* Note that it may be impossible to ignore really bad decompression
* errors, in which case the encoder will go !isok(), as it would
* if this boolean is 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
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