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file.go
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file.go
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package common
import (
"errors"
"io"
"os"
)
func NewFile(path string) File {
desc, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE, os.ModeAppend)
if err != nil {
panic(err)
}
return File{
Path: path,
Desc: desc,
Content: nil,
IsOpened: true,
}
}
var ErrClosedFile error = errors.New("File is closed")
func (f *File) Close() {
if f.IsOpened {
if err := f.Desc.Close(); err != nil {
panic(err)
}
f.IsOpened = false
}
}
func (f *File) ReadBytes() ([]byte, error) {
if !f.IsOpened {
return nil, ErrClosedFile
}
f.Desc.Seek(0, 0)
bytes, err := io.ReadAll(f.Desc)
if err != nil {
panic(err)
}
f.Content = bytes
return bytes, nil
}
func (f File) WriteBytes(bytes []byte) error {
if !f.IsOpened {
return ErrClosedFile
}
if err := f.Desc.Truncate(0); err != nil {
panic(err)
}
f.Append(bytes)
return nil
}
func (f File) WriteString(content string) error {
if !f.IsOpened {
return ErrClosedFile
}
if err := f.Desc.Truncate(0); err != nil {
panic(err)
}
if _, err := f.Desc.WriteString(content); err != nil {
panic(err)
}
return nil
}
func (f File) Append(bytes []byte) error {
if !f.IsOpened {
return ErrClosedFile
}
if _, err := f.Desc.Write(bytes); err != nil {
panic(err)
}
return nil
}