SQUASHFS/squashfs-tools-4.4/squashfs-tools/gzip_wrapper.h

   1 #ifndef GZIP_WRAPPER_H
   2 #define GZIP_WRAPPER_H
   3 /*
   4  * Squashfs
   5  *
   6  * Copyright (c) 2014
   7  * Phillip Lougher <phillip@squashfs.org.uk>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version 2,
  12  * or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  *
  23  * gzip_wrapper.h
  24  *
  25  */
  26
  27 #ifndef linux
  28 #define __BYTE_ORDER BYTE_ORDER
  29 #define __BIG_ENDIAN BIG_ENDIAN
  30 #define __LITTLE_ENDIAN LITTLE_ENDIAN
  31 #else
  32 #include <endian.h>
  33 #endif
  34
  35 #if __BYTE_ORDER == __BIG_ENDIAN
  36 extern unsigned int inswap_le16(unsigned short);
  37 extern unsigned int inswap_le32(unsigned int);
  38
  39 #define SQUASHFS_INSWAP_COMP_OPTS(s) { \
  40         (s)->compression_level = inswap_le32((s)->compression_level); \
  41         (s)->window_size = inswap_le16((s)->window_size); \
  42         (s)->strategy = inswap_le16((s)->strategy); \
  43 }
  44 #else
  45 #define SQUASHFS_INSWAP_COMP_OPTS(s)
  46 #endif
  47
  48 /* Default compression */
  49 #define GZIP_DEFAULT_COMPRESSION_LEVEL 9
  50 #define GZIP_DEFAULT_WINDOW_SIZE 15
  51
  52 struct gzip_comp_opts {
  53         int compression_level;
  54         short window_size;
  55         short strategy;
  56 };
  57
  58 struct strategy {
  59         char *name;
  60         int strategy;
  61         int selected;
  62 };
  63
  64 struct gzip_strategy {
  65         int strategy;
  66         int length;
  67         void *buffer;
  68 };
  69
  70 struct gzip_stream {
  71         z_stream stream;
  72         int strategies;
  73         struct gzip_strategy strategy[0];
  74 };
  75 #endif