fix screencap error on smartision

adb/send2adb.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+#
+
+set -e
+
+
+while read -p "@? " CMD
+do
+	FULLCMD=$(printf "%04x%s" ${#CMD} "${CMD}")
+	echo -n "$FULLCMD"
+done
+
+exit 0
+#echo "SEND: $FULLCMD"
+echo -n "${PREFIX}$FULLCMD" | nc localhost 5037
+echo ""

adb/tcpusb.go

@@ -0,0 +1,114 @@
+package adb
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"log"
+)
+
+const (
+	SYNC = "SYNC"
+	CXNN = "CXNN"
+	OPEN = "OPEN"
+	OKAY = "OKAY"
+	CLSE = "CLSE"
+	WRTE = "WRTE"
+	AUTH = "AUTH"
+)
+
+func checksum(data []byte) byte {
+	sum := byte(0)
+	for _, c := range data {
+		sum += c
+	}
+	return sum
+}
+
+func xorBytes(a, b []byte) []byte {
+	if len(a) != len(b) {
+		panic(fmt.Sprintf("xorBytes a:%x b:%x have different size", a, b))
+	}
+	dst := make([]byte, len(a))
+	for i := 0; i < len(a); i++ {
+		dst[i] = a[i] ^ b[i]
+	}
+	return dst
+}
+
+type AdbServer struct {
+	version       int
+	mayPayload    int
+	authorized    bool
+	syncToken     int
+	remoteID      int
+	services      map[string]string
+	remoteAddress string
+	token         string
+	signature     string
+}
+
+type PacketReader struct {
+	reader io.Reader
+	err    error
+}
+
+type errReader struct{}
+
+func (e errReader) Read(p []byte) (int, error) {
+	return 0, errors.New("package already read error")
+}
+
+func (p *PacketReader) r() io.Reader {
+	if p.err != nil { // use p.err to short error checks
+		return errReader{}
+	}
+	return p.reader
+}
+
+// Receive packet example
+// 00000000  43 4e 58 4e 01 00 00 01  00 00 10 00 23 00 00 00  |CNXN........#...|
+// 00000010  3c 0d 00 00 bc b1 a7 b1  68 6f 73 74 3a 3a 66 65  |<.......host::fe|
+// 00000020  61 74 75 72 65 73 3d 63  6d 64 2c 73 74 61 74 5f  |atures=cmd,stat_|
+// 00000030  76 32 2c 73 68 65 6c 6c  5f 76 32                 |v2,shell_v2|
+func (p *PacketReader) readPacket() {
+	var (
+		command = p.readStringN(4)
+		arg0    = p.readN(4)
+		arg1    = p.readN(4)
+		length  = p.readInt32()
+		check   = p.readInt32()
+		magic   = p.readN(4)
+	)
+	if p.err != nil {
+		return
+		// log.Println("ERR:", p.err)
+	}
+	if !bytes.Equal(xorBytes([]byte(command), magic), []byte{0xff, 0xff, 0xff, 0xff}) {
+		p.err = errors.New("verify magic failed")
+		return
+	}
+	log.Printf("cmd:%s, arg0:%x, arg1:%x, len:%d, check:%d, magic:%x",
+		command, arg0, arg1, length, check, magic)
+	log.Printf("cmd:%x", []byte(command))
+	body := p.readStringN(int(length))
+	log.Println(body)
+}
+
+func (p *PacketReader) readN(n int) []byte {
+	buf := make([]byte, n)
+	_, p.err = io.ReadFull(p.r(), buf)
+	return buf
+}
+
+func (p *PacketReader) readStringN(n int) string {
+	return string(p.readN(n))
+}
+
+func (p *PacketReader) readInt32() int32 {
+	var i int32
+	p.err = binary.Read(p.r(), binary.LittleEndian, &i)
+	return i
+}

adb/tcpusb_test.go

@@ -0,0 +1,21 @@
+package adb
+
+import (
+	"net"
+	"testing"
+)
+
+func TestTcpUsb(t *testing.T) {
+	lis, err := net.Listen("tcp", ":9000")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer lis.Close()
+	conn, err := lis.Accept()
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Logf("remote: %s", conn.RemoteAddr())
+	prd := PacketReader{reader: conn}
+	prd.readPacket()
+}

screenshot.go

@@ -24,7 +24,7 @@ func anyFuncs(funcs ...func() error) error {
 
 func takeScreenshot(serial, output string) error {
 	execOut := func() error {
-		c := adbCommand(serial, "exec-out", "screencap", "-p")
+		c := adbCommand(serial, "exec-out", "screencap", "-p", "2>/dev/null")
 		imgfile, err := os.Create(output)
 		if err != nil {
 			return err