# Needed since ANDROID 5, these programs run on android-16 (Android 4.1+)
#PIE是给可执行程序使用的flag（Position-Independent Executable位置无关可执行程序）
#ndk读取mk文件编译动态库也不需要指定pic
#LOCAL_CFLAGS += -fPIE
#LOCAL_LDFLAGS += -fPIE -pie

#include $(BUILD_EXECUTABLE)#可执行文件
include $(BUILD_SHARED_LIBRARY)#动态库
#include $(BUILD_STATIC_LIBRARY)#静态库

android {
    compileSdkVersion 28
    defaultConfig {
        ......
        externalNativeBuild {
            cmake {
                cppFlags ""
                abiFilters 'armeabi-v7a','x86'
            }
        }
    }
   externalNativeBuild {
        cmake {
            path "CMakeLists.txt"
        }
    }
   
}

cmake_minimum_required(VERSION 3.4.1)


add_library(
             native-lib
             SHARED
             src/main/cpp/native-lib.cpp )

#设置头文件查找目录
include_directories(
    src/main/cpp/lib7zr/C
    src/main/cpp/lib7zr/CPP
)

#设置库查找目录
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -L${CMAKE_SOURCE_DIR}/src/main/jniLibs/${CMAKE_ANDROID_ARCH_ABI}")

target_link_libraries(
                       native-lib
                       7zr
                       log )

#include <jni.h>
#include <string>
#include <7zTypes.h>
#include <android/log.h>

#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR, "7zr",__VA_ARGS__);

//表示这个函数在别的地方实现
extern int MY_CDECL main
        (
#ifndef _WIN32
        int numArgs, char *args[]
#endif
);

void strArgs(const char *cmd, int &args, char pString[66][1024]);

extern "C"
JNIEXPORT jint JNICALL
Java_com_example_sven_zip_ZipCode_exec(JNIEnv *env, jclass type, jstring cmd_) {
    const char *cmd = env->GetStringUTFChars(cmd_, 0);
    //7zr a /sdcard/7-Zip.7z /sdcard/7-Zip -mx=9
    int numArgs;
    char temp[66][1024] = {0};
    //分割字符串 将值填入变量
    strArgs(cmd, numArgs, temp);
    char *args[] = {0};
    for (int i = 0; i < numArgs; ++i) {
        args[i] = temp[i];
        LOGE("%s", args[i]);
    }
    env->ReleaseStringUTFChars(cmd_, cmd);
    return main(numArgs, args);
}

void strArgs(const char *cmd, int &numArgs, char argv[66][1024]) {
    //获得字符串长度
    int size = strlen(cmd);
    //argv的两个下标
    int a = 0, b = 0;
    //0 = false
    //记录是否进入空格
    //7zr         a /sdcard/7-Zip.7z /sdcard/7-Zip -mx=9
    // argv[0]="7zr\0"
    //argv[1]="a\0"
    //7zr\0
    int inspace = 0;
    for (int i = 0; i < size; ++i) {
        char c = cmd[i];
        switch (c) {
            case ' ':
            case '\t':
                if (inspace) {
                    //字符串结束符号
                    argv[a][b++] = '\0';
                    a++;
                    //加入下一个有效字符前 复原
                    b = 0;
                    inspace = 0;
                }
                break;
            default:
                //如果是字符
                inspace = 1;
                argv[a][b++] = c;
                break;
        }
    }
    //7zr a /sdcard/7-Zip.7z /sdcard/7-Zip -mx=9
    //如果最末尾不是空格 就不会进入  case ' ': case '\t': 补上最后一个结束符
//    if(inspace){}
    if (cmd[size - 1] != ' ' && cmd[size - 1] != '\t') {
        argv[a][b] = '\0';
        a++;
    }
    numArgs = a;
}

public class ZipCode {
    static {
        System.loadLibrary("native-lib");
    }

    public native static int exec(String cmd);
   
}

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            String[] perms = {Manifest.permission.WRITE_EXTERNAL_STORAGE};
            if (checkSelfPermission(perms[0]) == PackageManager.PERMISSION_DENIED) {
                requestPermissions(perms, 200);
            }
        }

        // 解压   7zr x [压缩文件]  -o[输出目录]
        // 压缩   7zr a [输出文件] [待压缩文件/目录] -mx=9
        File src = new File(Environment.getExternalStorageDirectory(), "7-Zip");
        File out = new File(Environment.getExternalStorageDirectory(), "7-Zip.7z");
        int result = ZipCode.exec("7zr a " + out.getAbsolutePath() + " "
                + src.getAbsolutePath() + " -mx=9");
        Log.e("Sven", "ZipCode.exec: "+result);
    }

}