HOW-TO: inline-decompress a .bz2 file with Go

bzip-inline-decompress.go

package main

import (
  "bufio"
  "compress/bzip2"
  "fmt"
  "io"
  "os"
)

var (
  // the bzip file
  bzipfile string = "/home/foo/bzipfile.bz2"
)

func main() {
  // open the file
  f, err := os.OpenFile(bzipfile, 0, 0)
  if err != nil {
    panic(err)
  }
  defer f.Close()
  // create a reader
  br := bufio.NewReader(f)
  // create a bzip2.reader, using the reader we just created
  cr := bzip2.NewReader(br)
  // lets do this. parse the file. 
  err = parsefile(cr)

}

func parsefile(bzipfile io.Reader) error {
  var ll string
  // create a reader, using the bzip2.reader we were passed
  d := bufio.NewReader(bzipfile)
  // create a scanner
  s := bufio.NewScanner(d)
  // scan the file! until Scan() returns "EOF", print out each line
  for s.Scan() {
    ll = s.Text()
    fmt.Printf("ll=%s\n", ll)
  }
  // we're done. return. 
  return nil
}