bzlib.h

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

/*
 * THIS FILE IS NOT IDENTICAL TO THE ORIGINAL
 * FROM THE BZIP2 DISTRIBUTION.
 *
 * It has been modified, mainly to break the library
 * into smaller pieces.
 *
 * Russ Cox
 * [e-mail]
 * July 2000
 */


/*-------------------------------------------------------------*/
/*--- Public header file for the library.                   ---*/
/*---                                               bzlib.h ---*/
/*-------------------------------------------------------------*/

/*--
  This file is a part of bzip2 and/or libbzip2, a program and
  library for lossless, block-sorting data compression.

  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:

  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.

  2. The origin of this software must not be misrepresented; you must 
     not claim that you wrote the original software.  If you use this 
     software in a product, an acknowledgment in the product 
     documentation would be appreciated but is not required.

  3. Altered source versions must be plainly marked as such, and must
     not be misrepresented as being the original software.

  4. The name of the author may not be used to endorse or promote 
     products derived from this software without specific prior written 
     permission.

  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.

  Julian Seward, Cambridge, UK.
  [e-mail]
  bzip2/libbzip2 version 1.0 of 21 March 2000

  This program is based on (at least) the work of:
     Mike Burrows
     David Wheeler
     Peter Fenwick
     Alistair Moffat
     Radford Neal
     Ian H. Witten
     Robert Sedgewick
     Jon L. Bentley

  For more information on these sources, see the manual.
--*/

#ifndef _BZLIB_H
#define _BZLIB_H

#ifdef __cplusplus
extern "C" {
#endif

#define BZ_RUN               0
#define BZ_FLUSH             1
#define BZ_FINISH            2

#define BZ_OK                0
#define BZ_RUN_OK            1
#define BZ_FLUSH_OK          2
#define BZ_FINISH_OK         3
#define BZ_STREAM_END        4
#define BZ_SEQUENCE_ERROR    (-1)
#define BZ_PARAM_ERROR       (-2)
#define BZ_MEM_ERROR         (-3)
#define BZ_DATA_ERROR        (-4)
#define BZ_DATA_ERROR_MAGIC  (-5)
#define BZ_IO_ERROR          (-6)
#define BZ_UNEXPECTED_EOF    (-7)
#define BZ_OUTBUFF_FULL      (-8)
#define BZ_CONFIG_ERROR      (-9)

typedef 
   struct {
      char *next_in;
      unsigned int avail_in;
      unsigned int total_in_lo32;
      unsigned int total_in_hi32;

      char *next_out;
      unsigned int avail_out;
      unsigned int total_out_lo32;
      unsigned int total_out_hi32;

      void *state;

      void *(*bzalloc)(void *,int,int);
      void (*bzfree)(void *,void *);
      void *opaque;
   } 
   bz_stream;


#ifndef BZ_IMPORT
#define BZ_EXPORT
#endif

#ifdef _WIN32
#   include <stdio.h>
#   include <windows.h>
#   ifdef small
      /* windows.h define small to char */
#      undef small
#   endif
#   ifdef BZ_EXPORT
#   define BZ_API(func) WINAPI func
#   define BZ_EXTERN extern
#   else
   /* import windows dll dynamically */
#   define BZ_API(func) (WINAPI * func)
#   define BZ_EXTERN
#   endif
#else
#   define BZ_API(func) func
#   define BZ_EXTERN extern
#endif


/*-- Core (low-level) library functions --*/

BZ_EXTERN int BZ_API(BZ2_bzCompressInit) ( 
      bz_stream* strm, 
      int        blockSize100k, 
      int        verbosity, 
      int        workFactor 
   );

BZ_EXTERN int BZ_API(BZ2_bzCompress) ( 
      bz_stream* strm, 
      int action 
   );

BZ_EXTERN int BZ_API(BZ2_bzCompressEnd) ( 
      bz_stream* strm 
   );

BZ_EXTERN int BZ_API(BZ2_bzDecompressInit) ( 
      bz_stream *strm, 
      int       verbosity, 
      int       small
   );

BZ_EXTERN int BZ_API(BZ2_bzDecompress) ( 
      bz_stream* strm 
   );

BZ_EXTERN int BZ_API(BZ2_bzDecompressEnd) ( 
      bz_stream *strm 
   );



/*-- Utility functions --*/

BZ_EXTERN int BZ_API(BZ2_bzBuffToBuffCompress) ( 
      char*         dest, 
      unsigned int* destLen,
      char*         source, 
      unsigned int  sourceLen,
      int           blockSize100k, 
      int           verbosity, 
      int           workFactor 
   );

BZ_EXTERN int BZ_API(BZ2_bzBuffToBuffDecompress) ( 
      char*         dest, 
      unsigned int* destLen,
      char*         source, 
      unsigned int  sourceLen,
      int           small, 
      int           verbosity 
   );


/*--
   Code contributed by Yoshioka Tsuneo
   ([e-mail]/[e-mail]),
   to support better zlib compatibility.
   This code is not _officially_ part of libbzip2 (yet);
   I haven't tested it, documented it, or considered the
   threading-safeness of it.
   If this code breaks, please contact both Yoshioka and me.
--*/

BZ_EXTERN const char * BZ_API(BZ2_bzlibVersion) (
      void
   );

#ifdef __cplusplus
}
#endif

#endif

/*-------------------------------------------------------------*/
/*--- end                                           bzlib.h ---*/
/*-------------------------------------------------------------*/