65 lines
1.5 KiB
Go
65 lines
1.5 KiB
Go
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// Package gzip implements reading and writing of gzip format compressed files.
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// See the compress/gzip package for more details.
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package gzip
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import (
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"compress/gzip"
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"fmt"
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"io"
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"os"
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)
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// Reader is an io.Reader that can be read to retrieve uncompressed data from a
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// gzip-format compressed file.
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type Reader struct {
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gzip.Reader
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name string
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isEOF bool
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}
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// NewReader creates a new Reader reading the given reader.
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func NewReader(r io.Reader, name string) (*Reader, error) {
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gr, err := gzip.NewReader(r)
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if err != nil {
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return nil, err
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}
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return &Reader{
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Reader: *gr,
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name: name,
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}, nil
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}
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// NextFile returns the file name. Calls subsequent to the first call will
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// return EOF.
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func (r *Reader) NextFile() (name string, err error) {
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if r.isEOF {
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return "", io.EOF
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}
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r.isEOF = true
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return r.name, nil
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}
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// Writer is an io.WriteCloser. Writes to a Writer are compressed and written to w.
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type Writer struct {
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gzip.Writer
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name string
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noMoreFiles bool
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}
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// NextFile never returns a next file, and should not be called more than once.
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func (w *Writer) NextFile(name string, _ os.FileInfo) error {
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if w.noMoreFiles {
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return fmt.Errorf("gzip: only accepts one file: already received %q and now %q", w.name, name)
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}
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w.noMoreFiles = true
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w.name = name
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return nil
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}
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// NewWriter returns a new Writer. Writes to the returned writer are compressed
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// and written to w.
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func NewWriter(w io.Writer) *Writer {
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return &Writer{Writer: *gzip.NewWriter(w)}
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}
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