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63 lines
1.8 KiB
63 lines
1.8 KiB
/*
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* Minio Cloud Storage, (C) 2016 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 main
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import "github.com/klauspost/reedsolomon"
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// getDataBlocks - fetches the data block only part of the input encoded blocks.
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func getDataBlocks(enBlocks [][]byte, dataBlocks int, curBlockSize int) (data []byte, err error) {
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if len(enBlocks) < dataBlocks {
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return nil, reedsolomon.ErrTooFewShards
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}
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size := 0
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blocks := enBlocks[:dataBlocks]
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for _, block := range blocks {
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size += len(block)
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}
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if size < curBlockSize {
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return nil, reedsolomon.ErrShortData
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}
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write := curBlockSize
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for _, block := range blocks {
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if write < len(block) {
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data = append(data, block[:write]...)
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return data, nil
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}
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data = append(data, block...)
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write -= len(block)
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}
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return data, nil
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}
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// checkBlockSize return the size of a single block.
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// The first non-zero size is returned,
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// or 0 if all blocks are size 0.
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func checkBlockSize(blocks [][]byte) int {
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for _, block := range blocks {
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if len(block) != 0 {
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return len(block)
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}
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}
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return 0
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}
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// calculate the blockSize based on input length and total number of
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// data blocks.
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func getEncodedBlockLen(inputLen int64, dataBlocks int) (curEncBlockSize int64) {
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curEncBlockSize = (inputLen + int64(dataBlocks) - 1) / int64(dataBlocks)
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return curEncBlockSize
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}
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