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package archiver
import (
"fmt"
"io"
"path/filepath"
"github.com/andybalholm/brotli"
)
// Brotli facilitates brotli compression.
type Brotli struct {
Quality int
}
// Compress reads in, compresses it, and writes it to out.
func (br *Brotli) Compress(in io.Reader, out io.Writer) error {
w := brotli.NewWriterLevel(out, br.Quality)
defer w.Close()
_, err := io.Copy(w, in)
return err
}
// Decompress reads in, decompresses it, and writes it to out.
func (br *Brotli) Decompress(in io.Reader, out io.Writer) error {
r := brotli.NewReader(in)
_, err := io.Copy(out, r)
return err
}
// CheckExt ensures the file extension matches the format.
func (br *Brotli) CheckExt(filename string) error {
if filepath.Ext(filename) != ".br" {
return fmt.Errorf("filename must have a .br extension")
}
return nil
}
func (br *Brotli) String() string { return "brotli" }
// NewBrotli returns a new, default instance ready to be customized and used.
func NewBrotli() *Brotli {
return &Brotli{
Quality: brotli.DefaultCompression,
}
}
// Compile-time checks to ensure type implements desired interfaces.
var (
_ = Compressor(new(Brotli))
_ = Decompressor(new(Brotli))
)
// DefaultBrotli is a default instance that is conveniently ready to use.
var DefaultBrotli = NewBrotli()
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