78 lines
1.6 KiB
Go
78 lines
1.6 KiB
Go
package main
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import (
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"io/ioutil"
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"log"
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"os"
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"strconv"
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"strings"
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"github.com/codegangsta/cli"
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"github.com/minio-io/minio/pkgs/erasure"
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)
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func decode(c *cli.Context) {
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// check if minio-encode called without parameters
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if len(c.Args()) != 1 {
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cli.ShowCommandHelp(c, "decode")
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return
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}
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// get input path
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inputFilePath := c.Args().Get(0)
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// get output path
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outputFilePath := inputFilePath
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if c.String("output") != "" {
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outputFilePath = c.String("output")
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}
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protectionLevel := c.String("protection-level")
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protectionLevelSplit := strings.Split(protectionLevel, ",")
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if len(protectionLevelSplit) != 2 {
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log.Fatal("Malformed input for protection-level")
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}
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k, err := strconv.Atoi(protectionLevelSplit[0])
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if err != nil {
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log.Fatal(err)
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}
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m, err := strconv.Atoi(protectionLevelSplit[1])
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if err != nil {
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log.Fatal(err)
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}
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// get chunks
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chunks := make([][]byte, k+m)
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for i := 0; i < k+m; i++ {
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chunks[i], _ = ioutil.ReadFile(inputFilePath + "." + strconv.Itoa(i))
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}
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// get length
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lengthBytes, err := ioutil.ReadFile(inputFilePath + ".length")
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if err != nil {
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log.Fatal(err)
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}
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lengthString := string(lengthBytes)
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length, err := strconv.Atoi(lengthString)
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if err != nil {
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log.Fatal(err)
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}
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// set up encoder
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erasureParameters, _ := erasure.ParseEncoderParams(k, m, erasure.CAUCHY)
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// decode data
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decodedData, err := erasure.Decode(chunks, erasureParameters, length)
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if err != nil {
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log.Fatal(err)
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}
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// write decode data out
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if _, err := os.Stat(outputFilePath); os.IsNotExist(err) {
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ioutil.WriteFile(outputFilePath, decodedData, 0600)
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} else {
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log.Fatal("Output file already exists")
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}
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}
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