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#ifndef COMPRESSOR_H
#define COMPRESSOR_H
/*
*
* Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014, 2022
* 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)(FILE *);
int (*option_args)(char *);
};
extern struct compressor *lookup_compressor(char *);
extern struct compressor *lookup_compressor_id(int);
extern void display_compressors(FILE *stream, char *, char *);
extern void display_compressor_usage(FILE *stream, 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);
}
static inline int compressor_option_args(struct compressor *comp, char *option)
{
if(comp == NULL || comp->option_args == NULL)
return 0;
return comp->option_args(option);
}
#endif
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