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package hotline
import (
"bytes"
"encoding/binary"
"errors"
"fmt"
"io"
)
type transfer struct {
Protocol [4]byte // "HTXF" 0x48545846
ReferenceNumber [4]byte // Unique Type 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 fmt.Errorf("read flatted file object: %v", err)
}
// Write the information fork
_, err := io.Copy(infoFork, &ffo.FlatFileInformationFork)
if err != nil {
return fmt.Errorf("write the information fork: %v", err)
}
if _, err = io.CopyN(targetFile, io.TeeReader(r, counterWriter), ffo.dataSize()); err != nil {
return fmt.Errorf("copy file data to partial file: %v", err)
}
if ffo.FlatFileHeader.ForkCount == [2]byte{0, 3} {
if err := binary.Read(r, binary.BigEndian, &ffo.FlatFileResForkHeader); err != nil {
return fmt.Errorf("read resource fork header: %v", err)
}
if _, err = io.CopyN(resForkFile, io.TeeReader(r, counterWriter), ffo.rsrcSize()); err != nil {
return fmt.Errorf("read resource fork: %v", err)
}
}
return nil
}