vessel/http_file.go

package vessel

import (
	"archive/zip"
	"io"
	"net/http"
	"os"
)

// File implements an http.File
type File struct {
	r      io.ReadCloser
	zip    *zip.File
	offset int64
}

// verify we implement the http.File interface
var _ http.File = (*File)(nil)

func newFile(z *zip.File) (*File, error) {
	r, err := z.Open()
	if err != nil {
		return nil, err
	}

	return &File{
		r:   r,
		zip: z,
	}, nil
}

// Readdir implements http.File
func (f *File) Readdir(count int) ([]os.FileInfo, error) {
	log.Log("read dir: %s\n", f.zip.Name)
	return nil, os.ErrPermission
}

// Stat implements http.File
func (f *File) Stat() (os.FileInfo, error) {
	return f.zip.FileInfo(), nil
}

// Seek implements io.Seeker
func (f *File) Seek(offset int64, whence int) (int64, error) {
	return f.offset, os.ErrInvalid
}

// Read implements io.Reader
func (f *File) Read(p []byte) (n int, err error) {
	c, err := f.r.Read(p)
	if err != nil {
		f.offset += int64(c)
	}
	return c, err
}

// Close implements io.Closer
func (f *File) Close() error {
	return f.r.Close()
}