//go:build linux || freebsd
// +build linux freebsd

package compression

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

type bzip2Decompressor struct{ *BaseDecompressor }

func NewBzip2Decompressor() *bzip2Decompressor {
	return &bzip2Decompressor{NewBaseDecompressor("bzip2", []string{"bzip2"}, []string{".bz2", ".tbz", ".tbz2"})}
}

// Reader returns a bzip2 decompression reader wrapped in a NopCloser.
// compress/bzip2.NewReader returns a plain io.Reader (no Close), so we
// wrap it to satisfy the io.ReadCloser contract of the Decompressor
// interface — the bzip2 reader has no internal state that needs
// releasing.
func (b *bzip2Decompressor) Reader(r io.Reader) (io.ReadCloser, error) {
	return io.NopCloser(bzip2.NewReader(r)), nil
}

type bzip2Compressor struct{ name string }

func NewBzip2Compressor() *bzip2Compressor { return &bzip2Compressor{name: "bzip2"} }
func (b *bzip2Compressor) Name() string    { return b.name }
func (b *bzip2Compressor) Writer(w io.Writer) (io.WriteCloser, error) {
	return nil, fmt.Errorf("bzip2 compression not supported in stdlib")
}

func init() { Register(NewBzip2Decompressor()) }