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|
// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build ignore
// Gendex generates a dex file used by Go apps created with gomobile.
//
// The dex is a thin extension of NativeActivity, providing access to
// a few platform features (not the SDK UI) not easily accessible from
// NDK headers. Long term these could be made part of the standard NDK,
// however that would limit gomobile to working with newer versions of
// the Android OS, so we do this while we wait.
//
// Respects ANDROID_HOME to set the path of the Android SDK.
// javac must be on the PATH.
package main
import (
"bytes"
"encoding/base64"
"errors"
"flag"
"fmt"
"go/format"
"log"
"os"
"os/exec"
"path/filepath"
"golang.org/x/mobile/internal/sdkpath"
)
var outfile = flag.String("o", "", "result will be written file")
var tmpdir string
func main() {
flag.Parse()
var err error
tmpdir, err = os.MkdirTemp("", "gendex-")
if err != nil {
log.Fatal(err)
}
err = gendex()
os.RemoveAll(tmpdir)
if err != nil {
log.Fatal(err)
}
}
func gendex() error {
androidHome, err := sdkpath.AndroidHome()
if err != nil {
return fmt.Errorf("couldn't find Android SDK: %w", err)
}
if err := os.MkdirAll(tmpdir+"/work/org/golang/app", 0775); err != nil {
return err
}
javaFiles, err := filepath.Glob("../../app/*.java")
if err != nil {
return err
}
if len(javaFiles) == 0 {
return errors.New("could not find ../../app/*.java files")
}
platform, err := findLast(androidHome + "/platforms")
if err != nil {
return err
}
cmd := exec.Command(
"javac",
"-source", "1.8",
"-target", "1.8",
"-bootclasspath", platform+"/android.jar",
"-d", tmpdir+"/work",
)
cmd.Args = append(cmd.Args, javaFiles...)
if out, err := cmd.CombinedOutput(); err != nil {
fmt.Println(cmd.Args)
os.Stderr.Write(out)
return err
}
buildTools, err := findLast(androidHome + "/build-tools")
if err != nil {
return err
}
cmd = exec.Command(
buildTools+"/dx",
"--dex",
"--output="+tmpdir+"/classes.dex",
tmpdir+"/work",
)
if out, err := cmd.CombinedOutput(); err != nil {
os.Stderr.Write(out)
return err
}
src, err := os.ReadFile(tmpdir + "/classes.dex")
if err != nil {
return err
}
data := base64.StdEncoding.EncodeToString(src)
buf := new(bytes.Buffer)
fmt.Fprint(buf, header)
var piece string
for len(data) > 0 {
l := 70
if l > len(data) {
l = len(data)
}
piece, data = data[:l], data[l:]
fmt.Fprintf(buf, "\t`%s` + \n", piece)
}
fmt.Fprintf(buf, "\t``")
out, err := format.Source(buf.Bytes())
if err != nil {
buf.WriteTo(os.Stderr)
return err
}
w, err := os.Create(*outfile)
if err != nil {
return err
}
if _, err := w.Write(out); err != nil {
return err
}
if err := w.Close(); err != nil {
return err
}
return nil
}
func findLast(path string) (string, error) {
dir, err := os.Open(path)
if err != nil {
return "", err
}
children, err := dir.Readdirnames(-1)
if err != nil {
return "", err
}
return path + "/" + children[len(children)-1], nil
}
var header = `// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Code generated by gendex.go. DO NOT EDIT.
package main
var dexStr = `
|
