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