Small is Beautiful

2019년 3월 25일 월요일

Java Parser (SAX vs DOM)

Java Parser (SAX vs DOM)에 대해 정리한다.

sax paser는 dom parser 대비 메모리 절약의 장점이 있으나, Random access 미지원 (Top down 형식으로 검색.)

- dom parser의 경우 xml 1byte 당 10byte 소모
- dom parser : xml parsing tree 유지

https://www.tutorialspoint.com/java_xml/java_sax_parser.htm
https://www.tutorialspoint.com/java_xml/java_dom_parse_document.htm

#java #sax_parser #domparser

COS - Java Card Smart Card Operation System

COS - Java Card Smart Card Operation System

https://stove99.tistory.com/96

Java 형변환 예제

Google+ 서비스 종료로 인해 과거의 기록들을 이곳으로 옮겨둔다.

Java 형변환에 대한 예.

String to Int

1. Integer.parseInt(string);
2. Integer.valueOf(string);

Integer.parseInt()
int Num = Integer.parseInt(Str);

--------------------------------------------------------------------------------------------------
Int to String

1. String.valueOf(number)
2. Integer.toString(number)
3. number + ""

-> String.valueOf(number) 와 Interger.toString(number) 는 동일.
-> number+"" 는 다른것에 비해 속도가 느리다.

--------------------------------------------------------------------------------------------------
Object to Byte Array

ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutput out = new ObjectOutputStream(bos);
out.writeObject(yourObject);
byte[] yourBytes = bos.toByteArray();

--------------------------------------------------------------------------------------------------
Byte Array to Object

ByteArrayIntputSream bis = new ByteArrayInputStream(yourBytes);
ObjectInput in = new ObjectInputStream(bis);
Object o = in.readObject();

--------------------------------------------------------------------------------------------------
Int to Byte Array

public static byte[] i2b_le(int myInteger){
return ByteBuffer.allocate(4).order(ByteOrder.LITTLE_ENDIAN).putInt(myInteger).array();
}

public static byte[] i2b_be(int myInteger){
return ByteBuffer.allocate(4).order(ByteOrder.BIG_ENDIAN).putInt(myInteger).array();
}

--------------------------------------------------------------------------------------------------
Byte Array to Int

public static int b2i_le(byte [] byteBarray){
return ByteBuffer.wrap(byteBarray).order(ByteOrder.LITTLE_ENDIAN).getInt();
}

public static int b2i_be(byte [] byteBarray){
return ByteBuffer.wrap(byteBarray).order(ByteOrder.BIG_ENDIAN).getInt();
}

--------------------------------------------------------------------------------------------------
String to Byte Array

byte[] b = string.getBytes();
byte[] b = string.getBytes(Charset.forName("UTF-8"));

--------------------------------------------------------------------------------------------------
Byte Array to String

byte [] t_sub3= getbytes(rcvData,8,rcvData.length-8);

String str = new String(t_sub3,0,t_sub3.length);

* t_sub3은 배열 이름, 0~t_sub3.length는 offset 이다.

--------------------------------------------------------------------------------------------------
Byte Array 부분 복사하기

public static void arraycopy(Object src,
int srcPos,
Object dest,
int destPos,
int length)

Copies an array from the specified source array, beginning at the specified position, to the specified position of the destination array.
A subsequence of array components are copied from the source array referenced by src to the destination array referenced by dest.
The number of components copied is equal to the length argument.
The components at positions srcPos through srcPos+length-1 in the source array are copied into positions destPos through destPos+length-1, respectively, of the destination array.

--------------------------------------------------------------------------------------------------
ArrayList 사용 method

myList.size() : 객체의 size 확인
myList.indexOf(d) : 객체의 index 확인
myList.contains(d) : 객체 존재여부 확인
myList.isEmpty() : ArrayList가 비어있는지 확인
myList.remove(d) : ArrayList에 있는 객체 제거

2019년 1월 10일 목요일

[Android] How to make standalone toolchain

Android 7.x 기준으로 NDK standalone toolchain을 생성하는 방법을 정리한다.

1. Android NDK 다운로드 후 압축
: 문서를 작성중인 현재 stable 버전은 r16b이다.
- https://developer.android.com/ndk/downloads/

2. standalone toolchain 생성
$ cd android-ndk
$ make-standalone-toolchain.sh --verbose --toolchain=arm-linux-androideabi-4.9 --package-dir=/home/sisbsoma/toolchain --platform=android-26 --arch=arm

HOST_OS=linux
HOST_EXE=
HOST_ARCH=x86_64
HOST_TAG=linux-x86_64
HOST_NUM_CPUS=8
BUILD_NUM_CPUS=16
## COMMAND: python /opt/android-sdk/ndk-bundle/build/tools/make_standalone_toolchain.py --arch arm --api 26 --stl gnustl --package-dir=/home/sisbsoma/toolchain

정상적으로 생성된 경우 아래와 같은 로그가 출력된다.
Package installed to /home/sisbsoma/toolchain.

생성된 이미지는 tar.bz2 형태로 압축되어 있다.
$ cd /home/sisbsoma/toolchain && ls
arm-linux-androideabi.tar.bz2

2018년 11월 6일 화요일

[Linux] Shell script for git pull - username & password 자동입력

Linux 환경에서 git pull 명령어 수행시 username & password를 script로 처리하기 위한 작업을 정리한다.

System : Ubuntu 14.04 LTS

==================================================================

script 수행을 위해서는 expect 가 설치되어 있어야 한다.
$ sudo apt-get install expect

expect 명령어는 아래와 같이 정의되어 있다. (자세한 내용은 링크 참조)

Expect is a program that "talks" to other interactive programs according to a script.
expect 기본 명령

spawn : 명령어를 실행한다.
expect “문자열” : “문자열"을 만나면
send “문자열\r” : "문자열"을 전송한다.
interact : expect를 끝내고 사용자에게 제어권을 넘긴다.
expect eof : expect 종료

==================================================================

[ Script Sample ]

사용자 옵션이 없을 경우, script에 정의된 default parameter를 기준으로 동작하도록 정의한다.

$ git-pull -d $HOME/work/project1 -u sisbsoma -p 1234

------------------------------------------------------------------------------------------------

[ Sample code]

file path : $HOME/bin/git-pull

#!/bin/bash

# Username & Password

USERNAME=USER_NAME ## set user.name for git repository

PASSWD=PASSWORD ## set password for git repository

# Default Working directory

WORKDIR=$HOME/work ## set default working directory

# Help function

usage() {

echo "usage : $0 [OPTIONS]"

echo " -h : Display Usage"

echo " -d : Working Directory"

echo " -u : Username"

echo " -p : Password"

exit 0

}

# Git pull

func_gitpull() {

cd $WORKDIR

expect <<EOF

spawn git pull

expect "Username"

send $USERNAME\r

expect "Password"

send $PASSWD\r

expect eof

EOF

}

# Update params

while getopts "h:d:u:p:" opt

case $opt in

d) WORKDIR=$OPTARG

;;

u) USERNAME=$OPTARG

;;

p) PASSWD=$OPTARG

;;

h) usage ;;

?) usage ;;

esac

done

func_gitpull

------------------------------------------------------------------------------------------------

2018년 6월 11일 월요일

[Android] Jack Server : How to support Multi User environment

Android Build System - Jack Server : How to support Multi User environment

#android_jack-server_multi-user
OS : Android 7.1

Single Build machine & Multi user 환경에서의 Android platform build 시 자동으로 사용자별(user id를 참조하여) jack-server를 구동하는 방법에 대해 기록한다.

- https://github.com/whitemuse/aosp-jack-server

기본적으로 Jack server는 하나의 build machine (computer)에 single user를 지원하는 구조이다.

Jack limitations (https://source.android.com/setup/build/jack)

By default, the Jack server is mono-user and can be only one user on a computer. To support additional users, select different port number for each user and adjust SERVER_NB_COMPILE accordingly. You can also disable the Jack server by setting SERVER=false in $HOME/.jack

웹 검색을 통해 사용자 별 Jack Server의 포트설정을 다르게 사용하는 것으로 해결이 가능함을 확인 할 수 있다. 다만, jack server 동작을 위한 설정파일($HOME/.jack-server/config.properties, $HOME/.jack-settings) 을 수동으로 편집해야 하는 불편함이 따른다. Build 시 자동으로 설정되도록 아래와 같이 수정한다.

-----------------------------------------------------------------------------------------

Runtime port 설정변경 & New jack server start

1. android/prebuilts/sdk/tools/jack

33 #####################################################

34 # TEAM - SISBSOMA

35 PORT_OFFSET=`id -u`

36 SERVER_PORT_SERVICE=`expr 8076 + ${PORT_OFFSET}`

37 SERVER_PORT_ADMIN=`expr 8077 + ${PORT_OFFSET}`

38 #####################################################

2. android/prebuilts/sdk/tools/jack-admin

45 #####################################################

46 # TEAM - SISBSOMA

47 PORT_OFFSET=`id -u`

48 SERVER_PORT_SERVICE_DEFAULT=8076

49 SERVER_PORT_ADMIN_DEFAULT=8077

51 SERVER_PORT_SERVICE=`expr 8076 + ${PORT_OFFSET}`

52 SERVER_PORT_ADMIN=`expr 8077 + ${PORT_OFFSET}`

53 ######################################################

55 #####################################################

56 # TEAM - SISBSOMA

57 updatePortNum() {

58 echo "Update Port Number - Jack Sever"

59 T_P=`grep SERVER_PORT_SERVICE ~/.jack-settings | cut -d'=' -f2`

60 if [ "$T_P" -ne "$SERVER_PORT_SERVICE" ]; then

61 if [ -f "$CLIENT_SETTING" ]; then

62 sed -i 's/SERVER_PORT_SERVICE.*/SERVER_PORT_SERVICE='$SERVER_PORT_SERVICE'/g' $CLIENT_SETTING

63 sed -i 's/SERVER_PORT_ADMIN.*/SERVER_PORT_ADMIN='$SERVER_PORT_ADMIN'/g' $CLIENT_SETTING

64 fi

65 fi

66 if [ -d "$JACK_HOME" ]; then

67 sed -i 's/jack.server.service.port.*/jack.server.service.port='$SERVER_PORT_SERVICE'/g' "$JACK_HOME/config.properties"

68 sed -i 's/jack.server.admin.port.*/jack.server.admin.port='$SERVER_PORT_ADMIN'/g' "$JACK_HOME/config.properties"

69 fi

70 }

71 #####################################################

216 waitServerStarted () {

217 DONE=1

218 let DATE_TIMEOUT=$(date +%s)+$JACK_CONNECTION_TIMEOUT

219 while [ "$DONE" -ne 0 ]; do

220 HTTP_CODE=$(curl -f $JACK_EXTRA_CURL_OPTIONS \

221 --cert "${JACK_HOME}/client.pem" \

222 --cacert "${JACK_HOME}/server.pem" \

223 --output /dev/null \

224 --no-buffer --write-out '%{http_code}' --silent --connect-timeout $JACK_CONNECTION_TIMEOUT \

225 -X GET \

226 -H "Accept: text/plain$CHARSET_ARGUMENT" \

227 --noproxy ${SERVER_HOST} \

228 https://${SERVER_HOST}:$SERVER_PORT_ADMIN/server \

229 )

230 CURL_CODE=$?

231 if [ $CURL_CODE -eq 7 ] || [ $CURL_CODE -eq 35 ] || [ $CURL_CODE -eq 58 ] || [ $CURL_CODE -eq 60 ] || [ $CURL_CODE -eq 77 ]; then

232 if [ $(date +%s) -ge $DATE_TIMEOUT ]; then

233 echo "Jack server failed to (re)start, try 'jack-diagnose' or see Jack server log" >&2

234 abort

235 else

236 #####################################################

237 # TEAM - SISBSOMA

238 if [ "$CURL_CODE" -eq 7 ]; then

239 if [ -f "$JACK_HOME/config.properties" ]; then

240 JSSP=`grep "jack.server.service.port" "$JACK_HOME/config.properties" | cut -d'=' -f2`

241 if [ "$JSSP" -ne "$SERVER_PORT_SERVICE" ]; then

242 echo "@@ (New) Jack Server start~!!"

243 updatePortNum

244 funcStartServer

245 funcStopServer $JSSP

246 fi

247 fi

248 fi

249 #####################################################

250 sleep 1

251 fi

252 else

253 # A connection was opened, no need to know if it went well

254 DONE=0;

255 fi

256 done

257 }

278 funcStopServer() {

279 echo "Stopping background server : $1"

280 HTTP_CODE=$(curl -f $JACK_EXTRA_CURL_OPTIONS \

281 --cert "${JACK_HOME}/client.pem" \

282 --cacert "${JACK_HOME}/server.pem" \

283 --output /dev/null \

284 --no-buffer --write-out '%{http_code}' --silent --connect-timeout $JACK_CONNECTION_TIMEOUT \

285 -X POST \

286 --noproxy ${SERVER_HOST} \

287 https://${SERVER_HOST}:$1/server/stop \

288 )

289

290 handleHttpErrors $? $HTTP_CODE

291 }

292

293 funcStartServer() {

294 JACK_SERVER_COMMAND="java -XX:MaxJavaStackTraceDepth=-1 -Djava.io.tmpdir=$TMPDIR $JACK_SERVER_VM_ARGUMENTS -cp $LAUNCHER_JAR $LAUNCHER_NAME"

295 echo "Launching Jack server" $JACK_SERVER_COMMAND

296 (

297 trap "" SIGHUP

298 for i in $(seq 3 255); do

299 eval exec "$i"'>&-'

300 done

301 cd "$JACK_HOME"

302 umask $BASE_UMASK

303 exec $JACK_SERVER_COMMAND

304 abort

305 ) >"$JACK_OUT_ERR" 2>&1 &

306 }

[Android] porting - memtester

How to Install memtester on Android system

Memory test를 위한 tool 적용

ref : https://github.com/royzhao/memtester4Android
version : 4.3.0 (32-bit)
=====================================
usage:
cd android/
source ./build/envsetup.sh
lunch xx
cd android/external/
git clone https://github.com/royzhao/memtester4Android.git
cd memtester4Android
mm
=====================================

Android.mk
1 LOCAL_PATH := $(call my-dir)
2 include $(CLEAR_VARS)
3
4 LOCAL_MODULE_TAGS := debug
5
6 LOCAL_SRC_FILES:= \
7 memtester.c tests.c
8 LOCAL_MODULE:= memtester
9 LOCAL_MODULE_FILENAME:=memtester
10 LOCAL_C_INCLUDES:=$(LOCAL_PATH)
11 #LOCAL_C_INCLUDES :=
12 #LOCAL_STATIC_LIBRARIES :=
13 #LOCAL_SHARED_LIBRARIES :=
14 include $(BUILD_EXECUTABLE)
15