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package hotline
import (
"bufio"
"bytes"
"encoding/binary"
"errors"
"io"
"os"
"path/filepath"
)
type transfer struct {
Protocol [4]byte // "HTXF" 0x48545846
ReferenceNumber [4]byte // Unique ID generated for the transfer
DataSize [4]byte // File size
RSVD [4]byte // Not implemented in Hotline Protocol
}
var HTXF = [4]byte{0x48, 0x54, 0x58, 0x46} // (HTXF) is the only supported transfer protocol
func (tf *transfer) Write(b []byte) (int, error) {
if err := binary.Read(bytes.NewReader(b), binary.BigEndian, tf); err != nil {
return 0, err
}
if tf.Protocol != HTXF {
return 0, errors.New("invalid protocol")
}
return len(b), nil
}
const fileCopyBufSize = 4096
func receiveFile(r io.Reader, targetFile, resForkFile, infoFork io.Writer) error {
var ffo flattenedFileObject
if _, err := ffo.ReadFrom(r); err != nil {
return err
}
// Write the information fork
_, err := infoFork.Write(ffo.FlatFileInformationFork.MarshalBinary())
if err != nil {
return err
}
// read and write the data fork
bw := bufio.NewWriterSize(targetFile, fileCopyBufSize)
if _, err = io.CopyN(bw, r, ffo.dataSize()); err != nil {
return err
}
if err := bw.Flush(); err != nil {
return err
}
if ffo.FlatFileHeader.ForkCount == [2]byte{0, 3} {
if err := binary.Read(r, binary.BigEndian, &ffo.FlatFileResForkHeader); err != nil {
return err
}
bw = bufio.NewWriterSize(resForkFile, fileCopyBufSize)
_, err = io.CopyN(resForkFile, r, ffo.rsrcSize())
if err != nil {
return err
}
if err := bw.Flush(); err != nil {
return err
}
}
return nil
}
func sendFile(w io.Writer, r io.Reader, offset int) (err error) {
br := bufio.NewReader(r)
if _, err := br.Discard(offset); err != nil {
return err
}
rSendBuffer := make([]byte, 1024)
for {
var bytesRead int
if bytesRead, err = br.Read(rSendBuffer); err == io.EOF {
if _, err := w.Write(rSendBuffer[:bytesRead]); err != nil {
return err
}
return nil
}
if err != nil {
return err
}
// totalSent += int64(bytesRead)
// fileTransfer.BytesSent += bytesRead
if _, err := w.Write(rSendBuffer[:bytesRead]); err != nil {
return err
}
}
}
func (s *Server) bannerDownload(w io.Writer) error {
bannerBytes, err := os.ReadFile(filepath.Join(s.ConfigDir, s.Config.BannerFile))
if err != nil {
return err
}
_, err = w.Write(bannerBytes)
return err
}
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