wimboot/wimboot-2.7.3/src/lznt1.h

   1 #ifndef _LZNT1_H
   2 #define _LZNT1_H
   3
   4 /*
   5  * Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  * 02110-1301, USA.
  21  */
  22
  23 /**
  24  * @file
  25  *
  26  * LZNT1 decompression
  27  *
  28  */
  29
  30 #include <stdint.h>
  31
  32 /** Extract LZNT1 block length */
  33 #define LZNT1_BLOCK_LEN( header ) ( ( (header) & 0x0fff ) + 1 )
  34
  35 /** Determine if LZNT1 block is compressed */
  36 #define LZNT1_BLOCK_COMPRESSED( header ) ( (header) & 0x8000 )
  37
  38 /** Extract LZNT1 compressed value length */
  39 #define LZNT1_VALUE_LEN( tuple, split ) \
  40         ( ( (tuple) & ( ( 1 << (split) ) - 1 ) ) + 3 )
  41
  42 /** Extract LZNT1 compressed value offset */
  43 #define LZNT1_VALUE_OFFSET( tuple, split ) ( ( (tuple) >> split ) + 1 )
  44
  45 extern ssize_t lznt1_decompress ( const void *data, size_t len, void *buf );
  46
  47 #endif /* _LZNT1_H */