| #ifndef COMPRESSOR_H |
| #define COMPRESSOR_H |
| /* |
| * |
| * Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014 |
| * Phillip Lougher <phillip@squashfs.org.uk> |
| * |
| * This program 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, |
| * or (at your option) any later version. |
| * |
| * This program 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 this program; if not, write to the Free Software |
| * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| * |
| * compressor.h |
| */ |
| |
| struct compressor { |
| int id; |
| char *name; |
| int supported; |
| int (*init)(void **, int, int); |
| int (*compress)(void *, void *, void *, int, int, int *); |
| int (*uncompress)(void *, void *, int, int, int *); |
| int (*options)(char **, int); |
| int (*options_post)(int); |
| void *(*dump_options)(int, int *); |
| int (*extract_options)(int, void *, int); |
| int (*check_options)(int, void *, int); |
| void (*display_options)(void *, int); |
| void (*usage)(); |
| }; |
| |
| extern struct compressor *lookup_compressor(char *); |
| extern struct compressor *lookup_compressor_id(int); |
| extern void display_compressors(char *, char *); |
| extern void display_compressor_usage(char *); |
| |
| static inline int compressor_init(struct compressor *comp, void **stream, |
| int block_size, int datablock) |
| { |
| if(comp->init == NULL) |
| return 0; |
| return comp->init(stream, block_size, datablock); |
| } |
| |
| |
| static inline int compressor_compress(struct compressor *comp, void *strm, |
| void *dest, void *src, int size, int block_size, int *error) |
| { |
| return comp->compress(strm, dest, src, size, block_size, error); |
| } |
| |
| |
| static inline int compressor_uncompress(struct compressor *comp, void *dest, |
| void *src, int size, int block_size, int *error) |
| { |
| return comp->uncompress(dest, src, size, block_size, error); |
| } |
| |
| |
| /* |
| * For the following functions please see the lzo, lz4 or xz |
| * compressors for commented examples of how they are used. |
| */ |
| static inline int compressor_options(struct compressor *comp, char *argv[], |
| int argc) |
| { |
| if(comp->options == NULL) |
| return -1; |
| |
| return comp->options(argv, argc); |
| } |
| |
| |
| static inline int compressor_options_post(struct compressor *comp, int block_size) |
| { |
| if(comp->options_post == NULL) |
| return 0; |
| return comp->options_post(block_size); |
| } |
| |
| |
| static inline void *compressor_dump_options(struct compressor *comp, |
| int block_size, int *size) |
| { |
| if(comp->dump_options == NULL) |
| return NULL; |
| return comp->dump_options(block_size, size); |
| } |
| |
| |
| static inline int compressor_extract_options(struct compressor *comp, |
| int block_size, void *buffer, int size) |
| { |
| if(comp->extract_options == NULL) |
| return size ? -1 : 0; |
| return comp->extract_options(block_size, buffer, size); |
| } |
| |
| |
| static inline int compressor_check_options(struct compressor *comp, |
| int block_size, void *buffer, int size) |
| { |
| if(comp->check_options == NULL) |
| return 0; |
| return comp->check_options(block_size, buffer, size); |
| } |
| |
| |
| static inline void compressor_display_options(struct compressor *comp, |
| void *buffer, int size) |
| { |
| if(comp->display_options != NULL) |
| comp->display_options(buffer, size); |
| } |
| #endif |