lzo1z.h

lzo-1.08-src.zip 高效的压缩解压代码

/* lzo1z.h -- public interface of the LZO1Z compression algorithm

   This file is part of the LZO real-time data compression library.

   Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer
   All Rights Reserved.

   The LZO library is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2 of
   the License, or (at your option) any later version.

   The LZO library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with the LZO library; see the file COPYING.
   If not, write to the Free Software Foundation, Inc.,
   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

   Markus F.X.J. Oberhumer
   <[e-mail]>
   http://www.oberhumer.com/opensource/lzo/
 */


#ifndef __LZO1Z_H
#define __LZO1Z_H

#ifndef __LZOCONF_H
#include <lzoconf.h>
#endif

#ifdef __cplusplus
extern "C" {
#endif


/***********************************************************************
//
************************************************************************/

/* Memory required for the wrkmem parameter.
 * When the required size is 0, you can also pass a NULL pointer.
 */

#define LZO1Z_MEM_COMPRESS      ((lzo_uint32) (16384L * lzo_sizeof_dict_t))
#define LZO1Z_MEM_DECOMPRESS    (0)
#define LZO1Z_MEM_OPTIMIZE      (0)


/* decompression */
LZO_EXTERN(int)
lzo1z_decompress        ( const lzo_byte *src, lzo_uint  src_len,
                                lzo_byte *dst, lzo_uintp dst_len,
                                lzo_voidp wrkmem /* NOT USED */ );

/* safe decompression with overrun testing */
LZO_EXTERN(int)
lzo1z_decompress_safe   ( const lzo_byte *src, lzo_uint  src_len,
                                lzo_byte *dst, lzo_uintp dst_len,
                                lzo_voidp wrkmem /* NOT USED */ );


/***********************************************************************
//
************************************************************************/

#if 0
/* not yet implemented */
LZO_EXTERN(int)
lzo1z_1_compress        ( const lzo_byte *src, lzo_uint  src_len,
                                lzo_byte *dst, lzo_uintp dst_len,
                                lzo_voidp wrkmem );
#endif


/***********************************************************************
// better compression ratio at the cost of more memory and time
************************************************************************/

#define LZO1Z_999_MEM_COMPRESS  ((lzo_uint32) (14 * 16384L * sizeof(short)))

#if !defined(LZO_999_UNSUPPORTED)
LZO_EXTERN(int)
lzo1z_999_compress      ( const lzo_byte *src, lzo_uint  src_len,
                                lzo_byte *dst, lzo_uintp dst_len,
                                lzo_voidp wrkmem );
#endif


/***********************************************************************
//
************************************************************************/

#if !defined(LZO_999_UNSUPPORTED)
LZO_EXTERN(int)
lzo1z_999_compress_dict     ( const lzo_byte *in , lzo_uint  in_len,
                                    lzo_byte *out, lzo_uintp out_len,
                                    lzo_voidp wrkmem,
                              const lzo_byte *dict, lzo_uint dict_len );

LZO_EXTERN(int)
lzo1z_999_compress_level    ( const lzo_byte *in , lzo_uint  in_len,
                                    lzo_byte *out, lzo_uintp out_len,
                                    lzo_voidp wrkmem,
                              const lzo_byte *dict, lzo_uint dict_len,
                                    lzo_progress_callback_t cb,
                                    int compression_level );
#endif

LZO_EXTERN(int)
lzo1z_decompress_dict_safe ( const lzo_byte *in,  lzo_uint  in_len,
                                   lzo_byte *out, lzo_uintp out_len,
                                   lzo_voidp wrkmem /* NOT USED */,
                             const lzo_byte *dict, lzo_uint dict_len );


/***********************************************************************
// optimize a compressed data block
************************************************************************/

#if 0
/* not yet implemented */
LZO_EXTERN(int)
lzo1z_optimize          (       lzo_byte *in , lzo_uint  in_len,
                                lzo_byte *out, lzo_uintp out_len,
                                lzo_voidp wrkmem );
#endif



#ifdef __cplusplus
} /* extern "C" */
#endif

#endif /* already included */