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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| package ioutils | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "compress/gzip" | ||
| "io" | ||
| ) | ||
|
|
||
| // Note: []byte can never be const as they are inherently mutable | ||
| var ( | ||
| // magic bytes to identify gzip. | ||
| // See https://www.ietf.org/rfc/rfc1952.txt | ||
| // and https://github.com/golang/go/blob/master/src/net/http/sniff.go#L186 | ||
| gzipIdent = []byte("\x1F\x8B\x08") | ||
| ) | ||
|
|
||
| // IsGzip returns checks if the file contents are gzip compressed | ||
| func IsGzip(input []byte) bool { | ||
| return len(input) >= 3 && bytes.Equal(gzipIdent, input[0:3]) | ||
| } | ||
|
|
||
| // Gzip compresses the input ([]byte) | ||
| func Gzip(input []byte) ([]byte, error) { | ||
| // Create gzip writer | ||
| var b bytes.Buffer | ||
| w := gzip.NewWriter(&b) | ||
|
|
||
| _, err := w.Write(input) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // You must close this first to flush the bytes to the buffer | ||
| err = w.Close() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return b.Bytes(), nil | ||
| } | ||
|
|
||
| // Gunzip decompresses the input ([]byte) | ||
| func Gunzip(input []byte) ([]byte, error) { | ||
| // Create gzip reader | ||
| b := bytes.NewReader(input) | ||
| r, err := gzip.NewReader(b) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| output, err := io.ReadAll(r) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| err = r.Close() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return output, nil | ||
| } |
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