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file.go
55 lines (45 loc) · 863 Bytes
/
file.go
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package local
import (
"errors"
"os"
)
type File struct {
FullPath string
read *os.File
write *os.File
}
func (f *File) Read(p []byte) (int, error) {
if f.write != nil {
return 0, errors.New("File is already opened in write mode")
}
if f.read == nil {
file, err := os.OpenFile(f.FullPath, os.O_RDONLY, 0700)
if err != nil {
return 0, err
}
f.read = file
}
return f.read.Read(p)
}
func (f *File) Close() error {
if f.read != nil {
return f.read.Close()
}
if f.write != nil {
return f.write.Close()
}
return nil
}
func (f *File) Write(p []byte) (int, error) {
if f.read != nil {
return 0, errors.New("File is already opened in read mode")
}
if f.write == nil {
file, err := os.OpenFile(f.FullPath, os.O_WRONLY|os.O_CREATE, 0700)
if err != nil {
return 0, err
}
f.write = file
}
return f.write.Write(p)
}