You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
157 lines
3.3 KiB
157 lines
3.3 KiB
/*
|
|
* Mini Object Storage, (C) 2014 Minio, Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
// +build linux
|
|
|
|
package erasure
|
|
|
|
// #cgo CPPFLAGS: -I./isal/include
|
|
// #cgo LDFLAGS: ./isal/isa-l.a
|
|
// #include <stdlib.h>
|
|
// #include <erasure-code.h>
|
|
// #include <stdlib.h>
|
|
//
|
|
// #include "encode.h"
|
|
import "C"
|
|
import (
|
|
"errors"
|
|
//"fmt"
|
|
"unsafe"
|
|
)
|
|
|
|
const (
|
|
VANDERMONDE = iota
|
|
CAUCHY = iota
|
|
)
|
|
|
|
const (
|
|
K = 10
|
|
M = 3
|
|
)
|
|
|
|
type EncoderParams struct {
|
|
k,
|
|
m,
|
|
technique int // cauchy or vandermonde matrix (RS)
|
|
}
|
|
|
|
type Encoder struct {
|
|
p *EncoderParams
|
|
k,
|
|
m C.int
|
|
encode_matrix,
|
|
encode_tbls,
|
|
decode_matrix,
|
|
decode_tbls *C.uchar
|
|
}
|
|
|
|
// Parameter validation
|
|
func ParseEncoderParams(k, m, technique int) (*EncoderParams, error) {
|
|
if k < 1 {
|
|
return nil, errors.New("k cannot be zero")
|
|
}
|
|
|
|
if m < 1 {
|
|
return nil, errors.New("m cannot be zero")
|
|
}
|
|
|
|
if k+m > 255 {
|
|
return nil, errors.New("(k + m) cannot be bigger than Galois field GF(2^8) - 1")
|
|
}
|
|
|
|
switch technique {
|
|
case VANDERMONDE:
|
|
break
|
|
case CAUCHY:
|
|
break
|
|
default:
|
|
return nil, errors.New("Technique can be either vandermonde or cauchy")
|
|
}
|
|
|
|
return &EncoderParams{
|
|
k: k,
|
|
m: m,
|
|
technique: technique,
|
|
}, nil
|
|
}
|
|
|
|
func NewEncoder(ep *EncoderParams) *Encoder {
|
|
var k = C.int(ep.k)
|
|
var m = C.int(ep.m)
|
|
|
|
var encode_matrix *C.uchar
|
|
var encode_tbls *C.uchar
|
|
|
|
C.minio_init_encoder(C.int(ep.technique), k, m, &encode_matrix,
|
|
&encode_tbls)
|
|
defer C.free(unsafe.Pointer(encode_matrix))
|
|
defer C.free(unsafe.Pointer(encode_tbls))
|
|
return &Encoder{
|
|
p: ep,
|
|
k: k,
|
|
m: m,
|
|
encode_matrix: encode_matrix,
|
|
encode_tbls: encode_tbls,
|
|
decode_matrix: nil,
|
|
decode_tbls: nil,
|
|
}
|
|
}
|
|
|
|
func (e *Encoder) Encode(block []byte) ([][]byte, int) {
|
|
var block_len = len(block)
|
|
|
|
chunk_size := int(C.calc_chunk_size(e.k, C.uint(block_len)))
|
|
chunk_len := chunk_size * e.p.k
|
|
pad_len := chunk_len - block_len
|
|
|
|
if pad_len > 0 {
|
|
s := make([]byte, pad_len)
|
|
// Expand with new padded blocks to the byte array
|
|
block = append(block, s...)
|
|
}
|
|
|
|
coded_len := chunk_size * e.p.m
|
|
c := make([]byte, coded_len)
|
|
block = append(block, c...)
|
|
|
|
// Allocate chunks
|
|
chunks := make([][]byte, e.p.k+e.p.m)
|
|
pointers := make([]*byte, e.p.k+e.p.m)
|
|
|
|
var i int
|
|
// Add data blocks to chunks
|
|
for i = 0; i < e.p.k; i++ {
|
|
chunks[i] = block[i*chunk_size : (i+1)*chunk_size]
|
|
pointers[i] = &chunks[i][0]
|
|
}
|
|
|
|
for i = e.p.k; i < (e.p.k + e.p.m); i++ {
|
|
chunks[i] = make([]byte, chunk_size)
|
|
pointers[i] = &chunks[i][0]
|
|
}
|
|
|
|
data := (**C.uchar)(unsafe.Pointer(&pointers[:e.p.k][0]))
|
|
coding := (**C.uchar)(unsafe.Pointer(&pointers[e.p.k:][0]))
|
|
|
|
C.ec_encode_data(C.int(chunk_size), e.k, e.m, e.encode_tbls, data,
|
|
coding)
|
|
return chunks, block_len
|
|
}
|
|
|
|
func Encode(block []byte, ep *EncoderParams) ([][]byte, int) {
|
|
encoder := NewEncoder(ep)
|
|
return encoder.Encode(block)
|
|
}
|
|
|