fix send dir on Windows

Closes: #16 [via git-merge-pr]

wormhole/send.go

@@ -525,12 +525,15 @@ func makeTmpZip(directoryName string, entries []DirectoryEntry) (*zipResult, err
 	var totalBytes int64
 
 	for _, entry := range entries {
-		if !strings.HasPrefix(entry.Path, directoryName+"/") {
+		entryPath := filepath.ToSlash(entry.Path)
+		prefixPath := filepath.ToSlash(directoryName) + "/"
+
+		if !strings.HasPrefix(entryPath, prefixPath) {
 			return nil, errors.New("each directory entry must be prefixed with the directoryName")
 		}
 
 		header := &zip.FileHeader{
-			Name:   strings.TrimPrefix(entry.Path, directoryName+"/"),
+			Name:   strings.TrimPrefix(entryPath, prefixPath),
 			Method: zip.Deflate,
 		}
 		header.SetMode(entry.Mode)

wormhole/wormhole_test.go

@@ -10,6 +10,7 @@ import (
 	"io"
 	"io/ioutil"
 	"net"
+	"path/filepath"
 	"strings"
 	"sync"
 	"testing"
@@ -322,14 +323,14 @@ func TestWormholeDirectoryTransportSendRecvDirect(t *testing.T) {
 
 	entries := []DirectoryEntry{
 		{
-			Path: "skyjacking/personalize.txt",
+			Path: filepath.Join("skyjacking", "personalize.txt"),
 			Reader: func() (io.ReadCloser, error) {
 				b := bytes.NewReader(personalizeContent)
 				return ioutil.NopCloser(b), nil
 			},
 		},
 		{
-			Path: "skyjacking/bodice-Maytag.txt",
+			Path: filepath.Join("skyjacking", "bodice-Maytag.txt"),
 			Reader: func() (io.ReadCloser, error) {
 				b := bytes.NewReader(bodiceContent)
 				return ioutil.NopCloser(b), nil