1 #ifndef GZIP_WRAPPER_H 2 #define GZIP_WRAPPER_H 3 /* 4 * Squashfs 5 * 6 * Copyright (c) 2014 7 * Phillip Lougher <phillip (at) 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 76
