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zopen.go
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zopen.go
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package m
import (
"compress/bzip2"
"compress/gzip"
"io"
"os"
"strings"
"github.com/klauspost/compress/zstd"
"github.com/ulikunitz/xz"
)
// The second return value is the file name with any compression extension removed.
func ZOpen(filename string) (io.ReadCloser, string, error) {
file, err := os.Open(filename)
if err != nil {
return nil, "", err
}
switch {
case strings.HasSuffix(filename, ".gz"):
reader, err := gzip.NewReader(file)
return reader, strings.TrimSuffix(filename, ".gz"), err
// Ref: https://github.com/walles/moar/issues/194
case strings.HasSuffix(filename, ".tgz"):
reader, err := gzip.NewReader(file)
return reader, strings.TrimSuffix(filename, ".tgz"), err
case strings.HasSuffix(filename, ".bz2"):
return struct {
io.Reader
io.Closer
}{bzip2.NewReader(file), file}, strings.TrimSuffix(filename, ".bz2"), nil
case strings.HasSuffix(filename, ".zst") || strings.HasSuffix(filename, ".zstd"):
decoder, err := zstd.NewReader(file)
if err != nil {
return nil, "", err
}
return decoder.IOReadCloser(), strings.TrimSuffix(filename, ".zst"), nil
case strings.HasSuffix(filename, ".xz"):
xzReader, err := xz.NewReader(file)
if err != nil {
return nil, "", err
}
return struct {
io.Reader
io.Closer
}{xzReader, file}, strings.TrimSuffix(filename, ".xz"), nil
}
return file, filename, nil
}