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package zipfs
import (
"archive/zip"
"io"
"os"
"path/filepath"
"syscall"
"github.com/spf13/afero"
)
type File struct {
fs *Fs
zipfile *zip.File
reader io.ReadCloser
offset int64
isdir, closed bool
buf []byte
}
func (f *File) fillBuffer(offset int64) (err error) {
if f.reader == nil {
if f.reader, err = f.zipfile.Open(); err != nil {
return
}
}
if offset > int64(f.zipfile.UncompressedSize64) {
offset = int64(f.zipfile.UncompressedSize64)
err = io.EOF
}
if len(f.buf) >= int(offset) {
return
}
buf := make([]byte, int(offset)-len(f.buf))
if n, readErr := io.ReadFull(f.reader, buf); n > 0 {
f.buf = append(f.buf, buf[:n]...)
} else if readErr != nil {
err = readErr
}
return
}
func (f *File) Close() (err error) {
f.zipfile = nil
f.closed = true
f.buf = nil
if f.reader != nil {
err = f.reader.Close()
f.reader = nil
}
return
}
func (f *File) Read(p []byte) (n int, err error) {
if f.isdir {
return 0, syscall.EISDIR
}
if f.closed {
return 0, afero.ErrFileClosed
}
err = f.fillBuffer(f.offset + int64(len(p)))
n = copy(p, f.buf[f.offset:])
f.offset += int64(n)
return
}
func (f *File) ReadAt(p []byte, off int64) (n int, err error) {
if f.isdir {
return 0, syscall.EISDIR
}
if f.closed {
return 0, afero.ErrFileClosed
}
err = f.fillBuffer(off + int64(len(p)))
n = copy(p, f.buf[int(off):])
return
}
func (f *File) Seek(offset int64, whence int) (int64, error) {
if f.isdir {
return 0, syscall.EISDIR
}
if f.closed {
return 0, afero.ErrFileClosed
}
switch whence {
case io.SeekStart:
case io.SeekCurrent:
offset += f.offset
case io.SeekEnd:
offset += int64(f.zipfile.UncompressedSize64)
default:
return 0, syscall.EINVAL
}
if offset < 0 || offset > int64(f.zipfile.UncompressedSize64) {
return 0, afero.ErrOutOfRange
}
f.offset = offset
return offset, nil
}
func (f *File) Write(p []byte) (n int, err error) { return 0, syscall.EPERM }
func (f *File) WriteAt(p []byte, off int64) (n int, err error) { return 0, syscall.EPERM }
func (f *File) Name() string {
if f.zipfile == nil {
return string(filepath.Separator)
}
return filepath.Join(splitpath(f.zipfile.Name))
}
func (f *File) getDirEntries() (map[string]*zip.File, error) {
if !f.isdir {
return nil, syscall.ENOTDIR
}
name := f.Name()
entries, ok := f.fs.files[name]
if !ok {
return nil, &os.PathError{Op: "readdir", Path: name, Err: syscall.ENOENT}
}
return entries, nil
}
func (f *File) Readdir(count int) (fi []os.FileInfo, err error) {
zipfiles, err := f.getDirEntries()
if err != nil {
return nil, err
}
for _, zipfile := range zipfiles {
fi = append(fi, zipfile.FileInfo())
if count > 0 && len(fi) >= count {
break
}
}
return
}
func (f *File) Readdirnames(count int) (names []string, err error) {
zipfiles, err := f.getDirEntries()
if err != nil {
return nil, err
}
for filename := range zipfiles {
names = append(names, filename)
if count > 0 && len(names) >= count {
break
}
}
return
}
func (f *File) Stat() (os.FileInfo, error) {
if f.zipfile == nil {
return &pseudoRoot{}, nil
}
return f.zipfile.FileInfo(), nil
}
func (f *File) Sync() error { return nil }
func (f *File) Truncate(size int64) error { return syscall.EPERM }
func (f *File) WriteString(s string) (ret int, err error) { return 0, syscall.EPERM }
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