53 lines
1.2 KiB
Go
53 lines
1.2 KiB
Go
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//go:build linux || freebsd
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// +build linux freebsd
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package compression
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import (
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"compress/lzw"
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"io"
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)
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const lzwLitWidth = 8
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type lzwDecompressor struct {
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*BaseDecompressor
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order lzw.Order
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}
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func NewLzwDecompressor() *lzwDecompressor { return NewLzwDecompressorWithOrder(lzw.LSB) }
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func NewLzwDecompressorWithOrder(order lzw.Order) *lzwDecompressor {
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name := "lzw"
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if order == lzw.MSB {
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name = "lzw-msb"
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}
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return &lzwDecompressor{NewBaseDecompressor(name, []string{}, []string{".z", ".lzw"}), order}
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}
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func (l *lzwDecompressor) Reader(r io.Reader) (io.ReadCloser, error) {
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return lzw.NewReader(r, l.order, lzwLitWidth), nil
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}
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type lzwCompressor struct {
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name string
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order lzw.Order
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}
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func NewLzwCompressor() *lzwCompressor { return NewLzwCompressorWithOrder(lzw.LSB) }
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func NewLzwCompressorWithOrder(order lzw.Order) *lzwCompressor {
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name := "lzw"
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if order == lzw.MSB {
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name = "lzw-msb"
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}
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return &lzwCompressor{name: name, order: order}
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}
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func (l *lzwCompressor) Name() string { return l.name }
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func (l *lzwCompressor) Writer(w io.Writer) (io.WriteCloser, error) {
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return lzw.NewWriter(w, l.order, lzwLitWidth), nil
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}
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func init() { Register(NewLzwDecompressor()) }
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