69 lines
1.2 KiB
Go
69 lines
1.2 KiB
Go
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package zipread
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import (
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"archive/zip"
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"bytes"
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"io"
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"io/fs"
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"os"
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)
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type SizedReaderAt struct {
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R io.ReaderAt
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Size int64
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}
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func NewSizedReaderFromOsFile(f *os.File) (*SizedReaderAt, error) {
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stat, err := f.Stat()
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if err != nil {
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return nil, err
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}
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return &SizedReaderAt{R: f, Size: stat.Size()}, nil
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}
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func NewSizedReaderFromReader(r io.Reader) (*SizedReaderAt, error) {
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data, err := io.ReadAll(r)
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if err != nil {
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return nil, err
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}
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contents := bytes.NewReader(data)
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return &SizedReaderAt{R: contents, Size: int64(len(data))}, nil
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}
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type ZipRead struct {
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*zip.Reader
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}
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func New(r *SizedReaderAt) (*ZipRead, error) {
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zr, err := zip.NewReader(r.R, r.Size)
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if err != nil {
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return nil, err
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}
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return &ZipRead{zr}, nil
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}
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func FromOsFile(f *os.File) (*ZipRead, error) {
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r, err := NewSizedReaderFromOsFile(f)
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if err != nil {
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return nil, err
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}
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return New(r)
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}
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func FromFsFile(f fs.File) (*ZipRead, error) {
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r, err := NewSizedReaderFromReader(f)
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if err != nil {
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return nil, err
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}
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return New(r)
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}
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func (zr *ZipRead) OpenZip(path string) (*ZipRead, error) {
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f, err := zr.Reader.Open(path)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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return FromFsFile(f)
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}
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