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/*
* Copyright 2014 Tushar Gohad
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY
* THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* liberasurecode flat_xor_hd backend
*
* vi: set noai tw=79 ts=4 sw=4:
*/
#include <stdio.h>
#include <stdlib.h>
#include <xor_code.h>
#include "erasurecode.h"
#include "erasurecode_backend.h"
#define FLAT_XOR_LIB_MAJOR 1
#define FLAT_XOR_LIB_MINOR 0
#define FLAT_XOR_LIB_REV 0
#define FLAT_XOR_LIB_VER_STR "1.0"
#define FLAT_XOR_LIB_NAME "flat_xor_hd"
#if defined(__MACOS__) || defined(__MACOSX__) || defined(__OSX__) || defined(__APPLE__)
#define FLAT_XOR_SO_NAME "libXorcode.dylib"
#else
#define FLAT_XOR_SO_NAME "libXorcode.so.1"
#endif
#define DEFAULT_W 32
/* Forward declarations */
struct ec_backend_op_stubs flat_xor_hd_ops;
struct ec_backend flat_xor_hd;
struct ec_backend_common backend_flat_xor_hd;
typedef xor_code_t* (*init_xor_hd_code_func)(int, int, int);
typedef void (*xor_code_encode_func)(xor_code_t *, char **, char **, int);
typedef int (*xor_code_decode_func)(xor_code_t *, char **, char **, int *, int, int);
typedef int (*xor_hd_fragments_needed_func)(xor_code_t *, int *, int *, int *);
struct flat_xor_hd_descriptor {
xor_code_t *xor_desc;
init_xor_hd_code_func init_xor_hd_code;
xor_code_encode_func xor_code_encode;
xor_code_decode_func xor_code_decode;
xor_hd_fragments_needed_func xor_hd_fragments_needed;
};
static int flat_xor_hd_encode(void *desc,
char **data, char **parity, int blocksize)
{
struct flat_xor_hd_descriptor *xdesc =
(struct flat_xor_hd_descriptor *) desc;
xor_code_t *xor_desc = (xor_code_t *) xdesc->xor_desc;
xor_desc->encode(xor_desc, data, parity, blocksize);
return 0;
}
static int flat_xor_hd_decode(void *desc,
char **data, char **parity, int *missing_idxs,
int blocksize)
{
struct flat_xor_hd_descriptor *xdesc =
(struct flat_xor_hd_descriptor *) desc;
xor_code_t *xor_desc = (xor_code_t *) xdesc->xor_desc;
return xor_desc->decode(xor_desc, data, parity, missing_idxs, blocksize, 1);
}
static int flat_xor_hd_reconstruct(void *desc,
char **data, char **parity, int *missing_idxs,
int destination_idx, int blocksize)
{
struct flat_xor_hd_descriptor *xdesc =
(struct flat_xor_hd_descriptor *) desc;
xor_code_t *xor_desc = (xor_code_t *) xdesc->xor_desc;
xor_reconstruct_one(xor_desc, data, parity,
missing_idxs, destination_idx, blocksize);
return 0;
}
static int flat_xor_hd_min_fragments(void *desc,
int *missing_idxs, int *fragments_to_exclude,
int *fragments_needed)
{
struct flat_xor_hd_descriptor *xdesc =
(struct flat_xor_hd_descriptor *) desc;
xor_code_t *xor_desc = (xor_code_t *) xdesc->xor_desc;
xor_desc->fragments_needed(xor_desc, missing_idxs, fragments_to_exclude, fragments_needed);
return 0;
}
/**
* Return the element-size, which is the number of bits stored
* on a given device, per codeword. This is usually just 'w'.
*/
static int
flar_xor_hd_element_size(void* desc)
{
return DEFAULT_W;
}
static void * flat_xor_hd_init(struct ec_backend_args *args, void *sohandle)
{
int k = args->uargs.k;
int m = args->uargs.m;
int hd = args->uargs.hd;
xor_code_t *xor_desc = NULL;
struct flat_xor_hd_descriptor *bdesc = NULL;
/* store w back in args so upper layer can get to it */
args->uargs.w = DEFAULT_W;
/* init xor_code_t descriptor */
xor_desc = init_xor_hd_code(k, m, hd);
if (NULL == xor_desc) {
return NULL;
}
/* fill in flat_xor_hd_descriptor */
bdesc = (struct flat_xor_hd_descriptor *)
malloc(sizeof(struct flat_xor_hd_descriptor));
if (NULL == bdesc) {
free (xor_desc);
return NULL;
}
bdesc->xor_desc = xor_desc;
return (void *) bdesc;
}
static int flat_xor_hd_exit(void *desc)
{
struct flat_xor_hd_descriptor *bdesc =
(struct flat_xor_hd_descriptor *) desc;
free (bdesc->xor_desc);
free (bdesc);
return 0;
}
/*
* For the time being, we only claim compatibility with versions that
* match exactly
*/
static bool flat_xor_is_compatible_with(uint32_t version) {
return version == backend_flat_xor_hd.ec_backend_version;
}
struct ec_backend_op_stubs flat_xor_hd_op_stubs = {
.INIT = flat_xor_hd_init,
.EXIT = flat_xor_hd_exit,
.ENCODE = flat_xor_hd_encode,
.DECODE = flat_xor_hd_decode,
.FRAGSNEEDED = flat_xor_hd_min_fragments,
.RECONSTRUCT = flat_xor_hd_reconstruct,
.ELEMENTSIZE = flar_xor_hd_element_size,
.ISCOMPATIBLEWITH = flat_xor_is_compatible_with,
.GETMETADATASIZE = get_backend_metadata_size_zero,
.GETENCODEOFFSET = get_encode_offset_zero,
};
struct ec_backend_common backend_flat_xor_hd = {
.id = EC_BACKEND_FLAT_XOR_HD,
.name = FLAT_XOR_LIB_NAME,
.soname = FLAT_XOR_SO_NAME,
.soversion = FLAT_XOR_LIB_VER_STR,
.ops = &flat_xor_hd_op_stubs,
.ec_backend_version = _VERSION(FLAT_XOR_LIB_MAJOR,
FLAT_XOR_LIB_MINOR,
FLAT_XOR_LIB_REV),
};
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