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  package android.taobao.atlas.util;
  
  import android.annotation.TargetApi;
  import android.os.Build;
  import android.taobao.atlas.framework.Framework;
  import android.text.TextUtils;
  import java.io.BufferedInputStream;
  import java.io.BufferedOutputStream;
  import java.io.File;
  import java.io.FileOutputStream;
  import java.util.zip.ZipEntry;
  
  /**
   * Created by guanjie on 2016/12/12.
   */
  
  public class SoLoader {
  
      private static final File LIB_DIR;
  
      static {
          LIB_DIR = new File(Framework.STORAGE_LOCATION,"lib");
          if(!LIB_DIR.exists()){
              LIB_DIR.mkdirs();
          }
      }
  
      public static void loadLibrary(String libName){
          if(TextUtils.isEmpty(libName)){
              throw new RuntimeException("can not load library without a name");
          }
          try{
              Runtime.getRuntime().loadLibrary(libName);
          }catch(UnsatisfiedLinkError error){
              if(!LIB_DIR.exists()){
                  LIB_DIR.mkdirs();
              }
              if(!LIB_DIR.exists()){
                  throw error;
              }
              String soName = System.mapLibraryName(libName);
              if(supportArmeabi()){
                  File soFile = null;
                  if(findLocalLibrary(soName) == null){
                      extractSoFromApk(soName);
                  }
                  if((soFile=findLocalLibrary(soName))!=null){
                      System.load(soFile.getAbsolutePath());
                  }else{
                      throw error;
                  }
              }
          }
      }
  
      @TargetApi(Build.VERSION_CODES.LOLLIPOP)
      private static boolean supportArmeabi(){
          if(Build.VERSION.SDK_INT>=21) {
              String[] abis = Build.SUPPORTED_ABIS;
              if (abis != null) {
                  for (String abi : abis) {
                      if (abi.equalsIgnoreCase("armeabi")) {
                          return true;
                      }
                  }
              }
          }else{
              if(Build.CPU_ABI.contains("armeabi") || Build.CPU_ABI2.contains("armeabi")){
                  return true;
              }
          }
  
          return false;
      }
  
      private static File findLocalLibrary(String libraryName){
          File soFile;
          if(LIB_DIR.exists() && (soFile=new File(LIB_DIR,libraryName)).exists()){
              return soFile;
          }else{
              return null;
          }
      }
  
      private static synchronized void extractSoFromApk(String soName){
          AtlasFileLock.getInstance().LockExclusive(LIB_DIR);
          if(findLocalLibrary(soName)!=null){
              AtlasFileLock.getInstance().unLock(LIB_DIR);
              return;
          }
          try {
              int retryCount = 2;
              do {
                  --retryCount;
                  String entryName = String.format("lib/armeabi/%s", soName);
                  ZipEntry targetEntry = null;
                  if (ApkUtils.getApk() != null && (targetEntry = ApkUtils.getApk().getEntry(entryName)) != null) {
                      File targetFile = new File(LIB_DIR, soName);
                      File targetFileTmp = new File(LIB_DIR,soName+".tmp");
                      if(!targetFileTmp.exists() || targetFileTmp.length()!=targetEntry.getSize()) {
                          if(targetFileTmp.exists()){
                              targetFileTmp.delete();
                          }
                          BufferedOutputStream bos = new BufferedOutputStream(
                                  new FileOutputStream(targetFileTmp.getAbsolutePath()));
                          BufferedInputStream bi = new BufferedInputStream(ApkUtils.getApk().getInputStream(targetEntry));
                          byte[] readContent = new byte[512];
                          int readCount = bi.read(readContent);
                          while (readCount != -1) {
                              bos.write(readContent, 0, readCount);
                              readCount = bi.read(readContent);
                          }
                          try {
                              bos.close();
                              bi.close();
                          } catch (Throwable e) {
                          }
                      }
                      if (targetFileTmp.exists()) {
                          if(targetFileTmp.length() == targetEntry.getSize()){
                              targetFileTmp.renameTo(targetFile);
                              if(!targetFile.exists()){
                                  targetFileTmp.renameTo(targetFile);
                              }
                              if(targetFile.exists()){
                                  break;
                              }
                          }else{
                              targetFileTmp.delete();
                          }
                      }
  
                  }
              } while (retryCount > 0);
          }catch(Exception e){
              e.printStackTrace();
          }finally {
              AtlasFileLock.getInstance().unLock(LIB_DIR);
          }
  
      }
  }
  