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d5ce2f6944
Remove option of providing Technique and handling errors based on that choose a matrix type automatically based on number of data blocks. INTEL recommends on using cauchy for consistent invertible matrices, while vandermonde is faster we should default to cauchy for large data blocks.
72 lines
2.0 KiB
Go
72 lines
2.0 KiB
Go
/*
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* Minio Cloud Storage, (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package donut
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import (
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encoding "github.com/minio/minio/pkg/erasure"
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"github.com/minio/minio/pkg/probe"
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)
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// encoder internal struct
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type encoder struct {
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encoder *encoding.Erasure
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k, m uint8
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}
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// newEncoder - instantiate a new encoder
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func newEncoder(k, m uint8) (encoder, *probe.Error) {
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e := encoder{}
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params, err := encoding.ValidateParams(k, m)
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if err != nil {
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return encoder{}, probe.NewError(err)
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}
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e.encoder = encoding.NewErasure(params)
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e.k = k
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e.m = m
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return e, nil
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}
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// TODO - think again if this is needed
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// GetEncodedBlockLen - wrapper around erasure function with the same name
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func (e encoder) GetEncodedBlockLen(dataLength int) (int, *probe.Error) {
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if dataLength <= 0 {
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return 0, probe.NewError(InvalidArgument{})
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}
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return encoding.GetEncodedBlockLen(dataLength, e.k), nil
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}
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// Encode - erasure code input bytes
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func (e encoder) Encode(data []byte) ([][]byte, *probe.Error) {
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if data == nil {
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return nil, probe.NewError(InvalidArgument{})
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}
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encodedData, err := e.encoder.Encode(data)
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if err != nil {
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return nil, probe.NewError(err)
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}
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return encodedData, nil
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}
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// Decode - erasure decode input encoded bytes
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func (e encoder) Decode(encodedData [][]byte, dataLength int) ([]byte, *probe.Error) {
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decodedData, err := e.encoder.Decode(encodedData, dataLength)
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if err != nil {
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return nil, probe.NewError(err)
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}
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return decodedData, nil
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}
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