X-Git-Url: https://git.r.bdr.sh/rbdr/mobius/blobdiff_plain/5c34f8752938764668d829fb284626b9c62c5475..5350396308932e1dabdc10c7b342b528d2f60a15:/hotline/transfer.go

diff --git a/hotline/transfer.go b/hotline/transfer.go
index b8bec1d..78bd888 100644
--- a/hotline/transfer.go
+++ b/hotline/transfer.go
@@ -1,50 +1,113 @@
 package hotline
 
 import (
+	"bufio"
 	"bytes"
 	"encoding/binary"
 	"errors"
+	"io"
 )
 
-type Transfer struct {
+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
 }
 
-func NewReadTransfer(b []byte) (Transfer, error) {
-	r := bytes.NewReader(b)
-	var transfer Transfer
+var HTXF = [4]byte{0x48, 0x54, 0x58, 0x46} // (HTXF) is the only supported transfer protocol
 
-	if err := binary.Read(r, binary.BigEndian, &transfer); err != nil {
-		return transfer, err
+func (tf *transfer) Write(b []byte) (int, error) {
+	if err := binary.Read(bytes.NewReader(b), binary.BigEndian, tf); err != nil {
+		return 0, err
 	}
 
-	// 0x48545846 (HTXF) is the only supported transfer protocol
-	if transfer.Protocol != [4]byte{0x48, 0x54, 0x58, 0x46} {
-		return transfer, errors.New("invalid protocol")
+	if tf.Protocol != HTXF {
+		return 0, errors.New("invalid protocol")
 	}
 
-	return transfer, nil
+	return len(b), nil
 }
 
-//
-//type FolderTransfer 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
-//	Action          [2]byte // Next file action
-//}
-//
-//func ReadFolderTransfer(b []byte) (FolderTransfer, error) {
-//	r := bytes.NewReader(b)
-//	var decodedEvent FolderTransfer
-//
-//	if err := binary.Read(r, binary.BigEndian, &decodedEvent); err != nil {
-//		return decodedEvent, err
-//	}
-//
-//	return decodedEvent, nil
-//}
+const fileCopyBufSize = 524288 // 512k
+func receiveFile(conn io.Reader, targetFile io.Writer, resForkFile io.Writer) error {
+	ffhBuf := make([]byte, 24)
+	if _, err := conn.Read(ffhBuf); err != nil {
+		return err
+	}
+
+	var ffh FlatFileHeader
+	err := binary.Read(bytes.NewReader(ffhBuf), binary.BigEndian, &ffh)
+	if err != nil {
+		return err
+	}
+
+	ffifhBuf := make([]byte, 16)
+	if _, err := conn.Read(ffifhBuf); err != nil {
+		return err
+	}
+
+	var ffifh FlatFileInformationForkHeader
+	err = binary.Read(bytes.NewReader(ffifhBuf), binary.BigEndian, &ffifh)
+	if err != nil {
+		return err
+	}
+
+	var ffif FlatFileInformationFork
+
+	dataLen := binary.BigEndian.Uint32(ffifh.DataSize[:])
+	ffifBuf := make([]byte, dataLen)
+	if _, err := conn.Read(ffifBuf); err != nil {
+		return err
+	}
+	if err := ffif.UnmarshalBinary(ffifBuf); err != nil {
+		return err
+	}
+
+	var ffdfh FlatFileDataForkHeader
+	ffdfhBuf := make([]byte, 16)
+	if _, err := conn.Read(ffdfhBuf); err != nil {
+		return err
+	}
+	err = binary.Read(bytes.NewReader(ffdfhBuf), binary.BigEndian, &ffdfh)
+	if err != nil {
+		return err
+	}
+
+	// this will be zero if the file only has a resource fork
+	fileSize := int(binary.BigEndian.Uint32(ffdfh.DataSize[:]))
+
+	bw := bufio.NewWriterSize(targetFile, fileCopyBufSize)
+	_, err = io.CopyN(bw, conn, int64(fileSize))
+	if err != nil {
+		return err
+	}
+	if err := bw.Flush(); err != nil {
+		return err
+	}
+
+	if ffh.ForkCount == [2]byte{0, 3} {
+		var resForkHeader FlatFileDataForkHeader
+		resForkBuf := make([]byte, 16)
+		resForkBufWrter := bufio.NewWriterSize(resForkFile, 16)
+		if _, err := io.CopyN(resForkBufWrter, conn, 16); err != nil {
+			return err
+		}
+		err = binary.Read(bytes.NewReader(resForkBuf), binary.BigEndian, &resForkHeader)
+		if err != nil {
+			return err
+		}
+
+		fileSize = int(binary.BigEndian.Uint32(resForkHeader.DataSize[:]))
+
+		bw = bufio.NewWriterSize(resForkFile, fileCopyBufSize)
+		_, err = io.CopyN(resForkFile, conn, int64(fileSize))
+		if err != nil {
+			return err
+		}
+		if err := bw.Flush(); err != nil {
+			return err
+		}
+	}
+	return nil
+}