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extensions.go
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/
extensions.go
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package extract
import (
"fmt"
)
// Format to validate file extension.
type Format interface {
CheckFormat(filename string) error
}
// formats lists the archive formats that the tool can work with
var formats = []Format{
&Tar{},
&TarGz{},
&Gz{},
&Rar{},
&Zip{},
&Bz2{},
}
/*
GetFormat returns the format of the file
*/
func GetFormat(filename string) (interface{}, error) {
f, err := ByFormat(filename)
if err != nil {
return nil, err
}
return f, nil
}
/*
Will return an new instance of the file format based on the
magic numbers found in the file.
*/
func ByFormat(filename string) (interface{}, error) {
var ext interface{}
for _, c := range formats {
if err := c.CheckFormat(filename); err == nil {
ext = c
break
}
}
switch ext.(type) {
case *Tar:
return NewTar(), nil
case *TarGz:
return NewTarGz(), nil
case *Gz:
return NewGz(), nil
case *Rar:
return NewRar(), nil
case *Zip:
return NewZip(), nil
case *Bz2:
return NewBz2(), nil
}
return nil, fmt.Errorf("unable to recognise format by filename: %s", filename)
}