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Storage erasure encoding info at StorageEntry and also store CRC at blockheader

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This commit is contained in:
Harshavardhana
2014-12-11 02:11:48 -08:00
parent 23a3609a64
commit 803c35ee90
3 changed files with 37 additions and 25 deletions
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34
pkgs/erasure/encode.go
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@@ -43,9 +43,9 @@ const (
// EncoderParams is a configuration set for building an encoder. It is created using ValidateParams.
type EncoderParams struct {
k,
m,
technique int // cauchy or vandermonde matrix (RS)
K,
M,
Technique int // cauchy or vandermonde matrix (RS)
}
// Encoder is an object used to encode and decode data.
@@ -87,21 +87,21 @@ func ParseEncoderParams(k, m, technique int) (*EncoderParams, error) {
}
return &EncoderParams{
k: k,
m: m,
technique: technique,
K: k,
M: m,
Technique: technique,
}, nil
}
// NewEncoder creates an encoder with a given set of parameters.
func NewEncoder(ep *EncoderParams) *Encoder {
var k = C.int(ep.k)
var m = C.int(ep.m)
var k = C.int(ep.K)
var m = C.int(ep.M)
var encode_matrix *C.uint8_t
var encode_tbls *C.uint8_t
C.minio_init_encoder(C.int(ep.technique), k, m, &encode_matrix,
C.minio_init_encoder(C.int(ep.Technique), k, m, &encode_matrix,
&encode_tbls)
return &Encoder{
@@ -122,7 +122,7 @@ func (e *Encoder) Encode(block []byte) ([][]byte, int) {
var block_len = len(block)
chunk_size := int(C.minio_calc_chunk_size(e.k, C.uint32_t(block_len)))
chunk_len := chunk_size * e.p.k
chunk_len := chunk_size * e.p.K
pad_len := chunk_len - block_len
if pad_len > 0 {
@@ -131,28 +131,28 @@ func (e *Encoder) Encode(block []byte) ([][]byte, int) {
block = append(block, s...)
}
coded_len := chunk_size * e.p.m
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)
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++ {
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++ {
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.uint8_t)(unsafe.Pointer(&pointers[:e.p.k][0]))
coding := (**C.uint8_t)(unsafe.Pointer(&pointers[e.p.k:][0]))
data := (**C.uint8_t)(unsafe.Pointer(&pointers[:e.p.K][0]))
coding := (**C.uint8_t)(unsafe.Pointer(&pointers[e.p.K:][0]))
C.ec_encode_data(C.int(chunk_size), e.k, e.m, e.encode_tbls, data,
coding)