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|
package rice
import (
"bytes"
"errors"
"os"
"path/filepath"
)
// File implements the io.Reader, io.Seeker, io.Closer and http.File interfaces
type File struct {
// File abstracts file methods so the user doesn't see the difference between rice.virtualFile, rice.virtualDir and os.File
// TODO: maybe use internal File interface and four implementations: *os.File, appendedFile, virtualFile, virtualDir
// real file on disk
realF *os.File
// when embedded (go)
virtualF *virtualFile
virtualD *virtualDir
// when appended (zip)
appendedF *appendedFile
appendedFileReader *bytes.Reader
// TODO: is appendedFileReader subject of races? Might need a lock here..
}
// Close is like (*os.File).Close()
// Visit http://golang.org/pkg/os/#File.Close for more information
func (f *File) Close() error {
if f.appendedF != nil {
if f.appendedFileReader == nil {
return errors.New("already closed")
}
f.appendedFileReader = nil
return nil
}
if f.virtualF != nil {
return f.virtualF.close()
}
if f.virtualD != nil {
return f.virtualD.close()
}
return f.realF.Close()
}
// Stat is like (*os.File).Stat()
// Visit http://golang.org/pkg/os/#File.Stat for more information
func (f *File) Stat() (os.FileInfo, error) {
if f.appendedF != nil {
if f.appendedF.dir {
return f.appendedF.dirInfo, nil
}
if f.appendedFileReader == nil {
return nil, errors.New("file is closed")
}
return f.appendedF.zipFile.FileInfo(), nil
}
if f.virtualF != nil {
return f.virtualF.stat()
}
if f.virtualD != nil {
return f.virtualD.stat()
}
return f.realF.Stat()
}
// Readdir is like (*os.File).Readdir()
// Visit http://golang.org/pkg/os/#File.Readdir for more information
func (f *File) Readdir(count int) ([]os.FileInfo, error) {
if f.appendedF != nil {
if f.appendedF.dir {
fi := make([]os.FileInfo, 0, len(f.appendedF.children))
for _, childAppendedFile := range f.appendedF.children {
if childAppendedFile.dir {
fi = append(fi, childAppendedFile.dirInfo)
} else {
fi = append(fi, childAppendedFile.zipFile.FileInfo())
}
}
return fi, nil
}
//++ TODO: is os.ErrInvalid the correct error for Readdir on file?
return nil, os.ErrInvalid
}
if f.virtualF != nil {
return f.virtualF.readdir(count)
}
if f.virtualD != nil {
return f.virtualD.readdir(count)
}
return f.realF.Readdir(count)
}
// Read is like (*os.File).Read()
// Visit http://golang.org/pkg/os/#File.Read for more information
func (f *File) Read(bts []byte) (int, error) {
if f.appendedF != nil {
if f.appendedFileReader == nil {
return 0, &os.PathError{
Op: "read",
Path: filepath.Base(f.appendedF.zipFile.Name),
Err: errors.New("file is closed"),
}
}
if f.appendedF.dir {
return 0, &os.PathError{
Op: "read",
Path: filepath.Base(f.appendedF.zipFile.Name),
Err: errors.New("is a directory"),
}
}
return f.appendedFileReader.Read(bts)
}
if f.virtualF != nil {
return f.virtualF.read(bts)
}
if f.virtualD != nil {
return f.virtualD.read(bts)
}
return f.realF.Read(bts)
}
// Seek is like (*os.File).Seek()
// Visit http://golang.org/pkg/os/#File.Seek for more information
func (f *File) Seek(offset int64, whence int) (int64, error) {
if f.appendedF != nil {
if f.appendedFileReader == nil {
return 0, &os.PathError{
Op: "seek",
Path: filepath.Base(f.appendedF.zipFile.Name),
Err: errors.New("file is closed"),
}
}
return f.appendedFileReader.Seek(offset, whence)
}
if f.virtualF != nil {
return f.virtualF.seek(offset, whence)
}
if f.virtualD != nil {
return f.virtualD.seek(offset, whence)
}
return f.realF.Seek(offset, whence)
}
|
