65 lines
964 B
Go
65 lines
964 B
Go
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package compression
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import (
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"bytes"
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"compress/flate"
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"compress/gzip"
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)
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// Gzip compression support
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type Gzip struct {
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*Options
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}
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// NewGzip creates a Gzip + Options variable
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func NewGzip() *Gzip {
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gz := new(Gzip)
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gz.Options = new(Options)
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return gz
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}
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// Compress to gzip
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func (gz *Gzip) Compress(content []byte) ([]byte, error) {
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if !gz.Options.Compress {
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return content, nil
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}
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// method
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var m int
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switch gz.Options.Method {
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case "NoCompression":
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m = flate.NoCompression
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break
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case "BestSpeed":
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m = flate.BestSpeed
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break
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case "BestCompression":
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m = flate.BestCompression
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break
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default:
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m = flate.DefaultCompression
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break
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}
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// compress
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var b bytes.Buffer
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w, err := gzip.NewWriterLevel(&b, m)
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if err != nil {
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return nil, err
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}
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// insert content
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_, err = w.Write(content)
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if err != nil {
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return nil, err
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}
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err = w.Close()
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if err != nil {
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return nil, err
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}
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// compressed content
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return b.Bytes(), nil
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}
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