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file_helper.go
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file_helper.go
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package filehelper
import (
"os"
)
type fileDB struct {
filePath string
file *os.File
}
func CreateNewFileDB(filePath string) (*fileDB, error) {
f := &fileDB{filePath: filePath}
return f, f.Open()
}
func (f *fileDB) Open() error {
file, err := os.OpenFile(f.filePath, os.O_RDWR | os.O_APPEND | os.O_CREATE, 0660)
if err != nil {
return err
}
f.file = file
return nil
}
func (f *fileDB) Close() error {
return f.file.Close()
}
func (f *fileDB) Remove() error {
err := f.Close()
if err != nil {
return err
}
return os.Remove(f.filePath)
}
func (f *fileDB) Read(offset int, length int) ([]byte, error) {
b := make([]byte, length)
_, err := f.file.ReadAt(b, int64(offset))
if err != nil {
return nil, err
}
return b, nil
}
func (f *fileDB) Write(b []byte, sync bool) error {
_, err := f.file.Write(b)
if err != nil {
return err
}
if sync {
return f.file.Sync()
}
return nil
}