zlib.h

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#define Z_NO_FLUSH      0
#define Z_PARTIAL_FLUSH 1
#define Z_FULL_FLUSH    2
#define Z_SYNC_FLUSH    3 /* experimental: partial_flush + byte align */
#define Z_FINISH        4
#define Z_PACKET_FLUSH	5
/* See deflate() below for the usage of these constants */

#define Z_OK            0
#define Z_STREAM_END    1
#define Z_ERRNO        (-1)
#define Z_STREAM_ERROR (-2)
#define Z_DATA_ERROR   (-3)
#define Z_MEM_ERROR    (-4)
#define Z_BUF_ERROR    (-5)
/* error codes for the compression/decompression functions */

#define Z_BEST_SPEED             1
#define Z_BEST_COMPRESSION       9
#define Z_DEFAULT_COMPRESSION  (-1)
/* compression levels */

#define Z_FILTERED            1
#define Z_HUFFMAN_ONLY        2
#define Z_DEFAULT_STRATEGY    0

#define Z_BINARY   0
#define Z_ASCII    1
#define Z_UNKNOWN  2
/* Used to set the data_type field */

#define Z_NULL  0  /* for initializing zalloc, zfree, opaque */

extern char *zlib_version;
/* The application can compare zlib_version and ZLIB_VERSION for consistency.
   If the first character differs, the library code actually used is
   not compatible with the zlib.h header file used by the application.
 */

                        /* basic functions */

extern int inflateInit OF((z_stream *strm));
/*
     Initializes the internal stream state for decompression. The fields
   zalloc and zfree must be initialized before by the caller.  If zalloc and
   zfree are set to Z_NULL, inflateInit updates them to use default allocation
   functions.

     inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not
   enough memory.  msg is set to null if there is no error message.
   inflateInit does not perform any decompression: this will be done by
   inflate().
*/


extern int inflate OF((z_stream *strm, int flush));
/*
  Performs one or both of the following actions:

  - Decompress more input starting at next_in and update next_in and avail_in
    accordingly. If not all input can be processed (because there is not
    enough room in the output buffer), next_in is updated and processing
    will resume at this point for the next call of inflate().

  - Provide more output starting at next_out and update next_out and avail_out
    accordingly.  inflate() always provides as much output as possible
    (until there is no more input data or no more space in the output buffer).

  Before the call of inflate(), the application should ensure that at least
  one of the actions is possible, by providing more input and/or consuming
  more output, and updating the next_* and avail_* values accordingly.
  The application can consume the uncompressed output when it wants, for
  example when the output buffer is full (avail_out == 0), or after each
  call of inflate().

    If the parameter flush is set to Z_PARTIAL_FLUSH or Z_PACKET_FLUSH,
  inflate flushes as much output as possible to the output buffer. The
  flushing behavior of inflate is not specified for values of the flush
  parameter other than Z_PARTIAL_FLUSH, Z_PACKET_FLUSH or Z_FINISH, but the
  current implementation actually flushes as much output as possible
  anyway.  For Z_PACKET_FLUSH, inflate checks that once all the input data
  has been consumed, it is expecting to see the length field of a stored
  block; if not, it returns Z_DATA_ERROR.

    inflate() should normally be called until it returns Z_STREAM_END or an
  error. However if all decompression is to be performed in a single step
  (a single call of inflate), the parameter flush should be set to
  Z_FINISH. In this case all pending input is processed and all pending
  output is flushed; avail_out must be large enough to hold all the
  uncompressed data. (The size of the uncompressed data may have been saved
  by the compressor for this purpose.) The next operation on this stream must
  be inflateEnd to deallocate the decompression state. The use of Z_FINISH
  is never required, but can be used to inform inflate that a faster routine
  may be used for the single inflate() call.

    inflate() returns Z_OK if some progress has been made (more input
  processed or more output produced), Z_STREAM_END if the end of the
  compressed data has been reached and all uncompressed output has been
  produced, Z_DATA_ERROR if the input data was corrupted, Z_STREAM_ERROR if
  the stream structure was inconsistent (for example if next_in or next_out
  was NULL), Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR if no
  progress is possible or if there was not enough room in the output buffer
  when Z_FINISH is used. In the Z_DATA_ERROR case, the application may then
  call inflateSync to look for a good compression block.  */


extern int inflateEnd OF((z_stream *strm));
/*
     All dynamically allocated data structures for this stream are freed.
   This function discards any unprocessed input and does not flush any
   pending output.

     inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state
   was inconsistent. In the error case, msg may be set but then points to a
   static string (which must not be deallocated).
*/

                        /* advanced functions */

extern int inflateInit2 OF((z_stream *strm,
                            int  windowBits));
/*
     This is another version of inflateInit with more compression options. The
   fields next_out, zalloc and zfree must be initialized before by the caller.

     The windowBits parameter is the base two logarithm of the maximum window
   size (the size of the history buffer).  It should be in the range 8..15 for
   this version of the library (the value 16 will be allowed soon). The
   default value is 15 if inflateInit is used instead. If a compressed stream
   with a larger window size is given as input, inflate() will return with
   the error code Z_DATA_ERROR instead of trying to allocate a larger window.

     If next_out is not null, the library will use this buffer for the history
   buffer; the buffer must either be large enough to hold the entire output
   data, or have at least 1<<windowBits bytes.  If next_out is null, the
   library will allocate its own buffer (and leave next_out null). next_in
   need not be provided here but must be provided by the application for the
   next call of inflate().

     If the history buffer is provided by the application, next_out must
   never be changed by the application since the decompressor maintains
   history information inside this buffer from call to call; the application
   can only reset next_out to the beginning of the history buffer when
   avail_out is zero and all output has been consumed.

      inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was
   not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as
   windowBits < 8). msg is set to null if there is no error message.
   inflateInit2 does not perform any decompression: this will be done by
   inflate().
*/

extern int inflateSync OF((z_stream *strm));
/*
    Skips invalid compressed data until the special marker (see deflate()
  above) can be found, or until all available input is skipped. No output
  is provided.

    inflateSync returns Z_OK if the special marker has been found, Z_BUF_ERROR
  if no more input was provided, Z_DATA_ERROR if no marker has been found,
  or Z_STREAM_ERROR if the stream structure was inconsistent. In the success
  case, the application may save the current current value of total_in which
  indicates where valid compressed data was found. In the error case, the
  application may repeatedly call inflateSync, providing more input each time,
  until success or end of the input data.
*/

extern int inflateReset OF((z_stream *strm));
/*
     This function is equivalent to inflateEnd followed by inflateInit,
   but does not free and reallocate all the internal decompression state.
   The stream will keep attributes that may have been set by inflateInit2.

      inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
   stream state was inconsistent (such as zalloc or state being NULL).
*/

extern int inflateIncomp OF((z_stream *strm));
/*
     This function adds the data at next_in (avail_in bytes) to the output
   history without performing any output.  There must be no pending output,
   and the decompressor must be expecting to see the start of a block.
   Calling this function is equivalent to decompressing a stored block
   containing the data at next_in (except that the data is not output).
*/

                        /* checksum functions */

/*
     This function is not related to compression but is exported
   anyway because it might be useful in applications using the
   compression library.
*/

extern uLong adler32 OF((uLong adler, Bytef *buf, uInt len));

/*
     Update a running Adler-32 checksum with the bytes buf[0..len-1] and
   return the updated checksum. If buf is NULL, this function returns
   the required initial value for the checksum.
   An Adler-32 checksum is almost as reliable as a CRC32 but can be computed
   much faster. Usage example:

     uLong adler = adler32(0L, Z_NULL, 0);

     while (read_buffer(buffer, length) != EOF) {
       adler = adler32(adler, buffer, length);
     }
     if (adler != original_adler) error();
*/

#ifndef _Z_UTIL_H
    struct internal_state {int dummy;}; /* hack for buggy compilers */
#endif

#endif /* _ZLIB_H */