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package hotline
import (
"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
}
func receiveFile(r io.Reader, targetFile, resForkFile, infoFork, counterWriter io.Writer) error {
var ffo flattenedFileObject
if _, err := ffo.ReadFrom(r); err != nil {
return err
}
// Write the information fork
_, err := io.Copy(infoFork, &ffo.FlatFileInformationFork)
if err != nil {
return err
}
if _, err = io.CopyN(targetFile, io.TeeReader(r, counterWriter), ffo.dataSize()); 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
}
if _, err = io.CopyN(resForkFile, io.TeeReader(r, counterWriter), ffo.rsrcSize()); err != nil {
return err
}
}
return nil
}
// TODO: read the banner once on startup instead of once per banner fetch
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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