diff --git a/cmd/soong_jar/soong_jar.go b/cmd/soong_jar/soong_jar.go
new file mode 100644
index 0000000..2314496
--- /dev/null
+++ b/cmd/soong_jar/soong_jar.go
@@ -0,0 +1,220 @@
+// Copyright 2015 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"archive/zip"
+	"flag"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+type fileArg struct {
+	relativeRoot, file string
+}
+
+type fileArgs []fileArg
+
+func (l *fileArgs) String() string {
+	return `""`
+}
+
+func (l *fileArgs) Set(s string) error {
+	if *relativeRoot == "" {
+		return fmt.Errorf("must pass -C before -f")
+	}
+
+	*l = append(*l, fileArg{*relativeRoot, s})
+	return nil
+}
+
+func (l *fileArgs) Get() interface{} {
+	return l
+}
+
+var (
+	out          = flag.String("o", "", "file to write jar file to")
+	manifest     = flag.String("m", "", "input manifest file name")
+	directories  = flag.Bool("d", false, "include directories in jar")
+	relativeRoot = flag.String("C", "", "path to use as relative root of files in next -f or -l argument")
+	listFiles    fileArgs
+	files        fileArgs
+)
+
+func init() {
+	flag.Var(&listFiles, "l", "file containing list of .class files")
+	flag.Var(&files, "f", "file to include in jar")
+}
+
+func usage() {
+	fmt.Fprintf(os.Stderr, "usage: soong_jar -o jarfile [-m manifest] -C dir [-f|-l file]...\n")
+	flag.PrintDefaults()
+	os.Exit(2)
+}
+
+type zipInfo struct {
+	time        time.Time
+	createdDirs map[string]bool
+	directories bool
+}
+
+func main() {
+	flag.Parse()
+
+	if *out == "" {
+		fmt.Fprintf(os.Stderr, "error: -o is required\n")
+		usage()
+	}
+
+	info := zipInfo{
+		time:        time.Now(),
+		createdDirs: make(map[string]bool),
+		directories: *directories,
+	}
+
+	// TODO: Go's zip implementation doesn't support increasing the compression level yet
+	err := writeZipFile(*out, listFiles, *manifest, info)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err.Error())
+		os.Exit(1)
+	}
+}
+
+func writeZipFile(out string, listFiles fileArgs, manifest string, info zipInfo) error {
+	f, err := os.Create(out)
+	if err != nil {
+		return err
+	}
+
+	defer f.Close()
+	defer func() {
+		if err != nil {
+			os.Remove(out)
+		}
+	}()
+
+	zipFile := zip.NewWriter(f)
+	defer zipFile.Close()
+
+	for _, listFile := range listFiles {
+		err = writeListFile(zipFile, listFile, info)
+		if err != nil {
+			return err
+		}
+	}
+
+	for _, file := range files {
+		err = writeRelFile(zipFile, file.relativeRoot, file.file, info)
+		if err != nil {
+			return err
+		}
+	}
+
+	if manifest != "" {
+		err = writeFile(zipFile, "META-INF/MANIFEST.MF", manifest, info)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func writeListFile(zipFile *zip.Writer, listFile fileArg, info zipInfo) error {
+	list, err := ioutil.ReadFile(listFile.file)
+	if err != nil {
+		return err
+	}
+
+	files := strings.Split(string(list), "\n")
+
+	for _, file := range files {
+		file = strings.TrimSpace(file)
+		if file == "" {
+			continue
+		}
+		err = writeRelFile(zipFile, listFile.relativeRoot, file, info)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func writeRelFile(zipFile *zip.Writer, root, file string, info zipInfo) error {
+	rel, err := filepath.Rel(root, file)
+	if err != nil {
+		return err
+	}
+
+	err = writeFile(zipFile, rel, file, info)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func writeFile(zipFile *zip.Writer, rel, file string, info zipInfo) error {
+	if info.directories {
+		dir, _ := filepath.Split(rel)
+		for dir != "" && !info.createdDirs[dir] {
+			info.createdDirs[dir] = true
+
+			dirHeader := &zip.FileHeader{
+				Name: dir,
+			}
+			dirHeader.SetMode(os.ModeDir)
+			dirHeader.SetModTime(info.time)
+
+			_, err := zipFile.CreateHeader(dirHeader)
+			if err != nil {
+				return err
+			}
+
+			dir, _ = filepath.Split(dir)
+		}
+	}
+
+	fileHeader := &zip.FileHeader{
+		Name:   rel,
+		Method: zip.Deflate,
+	}
+	fileHeader.SetModTime(info.time)
+
+	out, err := zipFile.CreateHeader(fileHeader)
+	if err != nil {
+		return err
+	}
+
+	in, err := os.Open(file)
+	if err != nil {
+		return err
+	}
+	defer in.Close()
+
+	_, err = io.Copy(out, in)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}