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/*
* csum.h
*
* Copyright (C) 2016 SUSE. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License version 2 as published by the Free Software Foundation.
*
* 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.
*/
#ifndef __CSUM_H__
#define __CSUM_H__
#include <stdio.h>
#define DIGEST_LEN_MAX 32
#define DEFAULT_HASH_STR "murmur3"
extern unsigned int digest_len;
extern char hash_type[8];
/* Init / debug */
int init_csum_module(const char *type);
void debug_print_digest_len(FILE *stream, unsigned char *digest, int len);
static inline void debug_print_digest(FILE *stream, unsigned char *digest)
{
debug_print_digest_len(stream, digest, digest_len);
}
static inline void debug_print_digest_short(FILE *stream, unsigned char *digest)
{
debug_print_digest_len(stream, digest, 4);
}
/* Checksums a single block in one go. */
void checksum_block(char *buf, int len, unsigned char *digest);
/* Keeping a 'running' checksum - we add data to it a bit at a time */
struct running_checksum;
struct running_checksum *start_running_checksum(void);
void add_to_running_checksum(struct running_checksum *c,
unsigned int len, unsigned char *buf);
void finish_running_checksum(struct running_checksum *c, unsigned char *digest);
/* csum-module implementation details */
struct csum_module_ops {
int (*init)(unsigned int *ret_digest_len);
void (*checksum_block)(char *buf, int len, unsigned char *digest);
struct running_checksum *(*start_running_checksum)(void);
void (*add_to_running_checksum)(struct running_checksum *c,
unsigned int len, unsigned char *buf);
void (*finish_running_checksum)(struct running_checksum *c,
unsigned char *digest);
};
struct csum_module {
/*
* Friendly name, suitable for printing to the user. We use
* this also for option parsing.
*/
const char *name;
/*
* Internally identifies this hash, is also what we write in
* hashfiles. Must not exceed 8 characters.
*/
const char *hash_type;
struct csum_module_ops *ops;
};
extern struct csum_module csum_module_xxhash;
extern struct csum_module csum_module_murmur3;
extern struct csum_module *csum_mod; /* The module currently in use */
#define DECLARE_RUNNING_CSUM_CAST_FUNCS(_type) \
static inline struct _type * \
rc_to_priv(struct running_checksum *rc) \
{ \
return (struct _type *)rc; \
} \
static inline struct running_checksum * \
priv_to_rc(struct _type *priv) \
{ \
return (struct running_checksum *)priv; \
}
#endif /* csum.h */
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