Fix cp and stat for assets #45

src/android/src/main/java/com/RNFetchBlob/RNFetchBlobFS.java

         try {
             stream.write(chunk);
             callback.invoke();
-            chunk = null;
         } catch (Exception e) {
             callback.invoke(e.getLocalizedMessage());
         }
 
         try {
 
-            String destFolder = new File(dest).getPath();
-            if(!new File(path).exists()) {
+            if(!isPathExists(path)) {
                 callback.invoke("cp error: source file at path`" + path + "` not exists");
                 return;
             }
             try {
                 String filename = path.replace(assetPrefix, "");
                 AssetFileDescriptor fd = RNFetchBlob.RCTContext.getAssets().openFd(filename);
-                // TODO : handle asset folder
                 callback.invoke(true, false);
             } catch (IOException e) {
                 callback.invoke(false, false);
     static void ls(String path, Callback callback) {
         path = normalizePath(path);
         File src = new File(path);
-        // TODO : handle asset folder
-        if(!src.exists() || !src.isDirectory()) {
+        if (!src.exists() || !src.isDirectory()) {
             callback.invoke("ls error: failed to list path `" + path + "` for it is not exist or it is not a folder");
             return;
         }
-        String [] files = new File(path).list();
+        String[] files = new File(path).list();
         WritableArray arg = Arguments.createArray();
-        for(String i : files) {
+        for (String i : files) {
             arg.pushString(i);
         }
         callback.invoke(null, arg);
 
     static void lstat(String path, final Callback callback) {
         path = normalizePath(path);
-        File src = new File(path);
+
         new AsyncTask<String, Integer, Integer>() {
             @Override
             protected Integer doInBackground(String ...args) {

src/fs.js

   }
 }
 
-function addAssetPrefix(path:string):string {
+function asset(path:string):string {
   if(Platform.OS === 'ios') {
     // path from camera roll
     if(/^assets-library\:\/\//.test(path))
   lstat,
   scanFile,
   dirs,
-  addAssetPrefix
+  asset
 }

src/ios/RNFetchBlob/RNFetchBlob.m

     BOOL exist = nil;
     BOOL isDir = nil;
     NSError * error = nil;
+    
+    path = [RNFetchBlobFS getPathOfAsset:path];
+    
     exist = [fm fileExistsAtPath:path isDirectory:&isDir];
     if(exist == NO) {
         callback(@[[NSString stringWithFormat:@"failed to list path `%@` for it is not exist or it is not exist", path]]);
     NSFileManager* fm = [NSFileManager defaultManager];
     BOOL exist = nil;
     BOOL isDir = nil;
+    
+    path = [RNFetchBlobFS getPathOfAsset:path];
+    
     exist = [fm fileExistsAtPath:path isDirectory:&isDir];
     if(exist == NO) {
         callback(@[[NSString stringWithFormat:@"failed to list path `%@` for it is not exist or it is not exist", path]]);
 
 RCT_EXPORT_METHOD(cp:(NSString *)path toPath:(NSString *)dest callback:(RCTResponseSenderBlock) callback) {
     NSError * error = nil;
+    path = [RNFetchBlobFS getPathOfAsset:path];
     BOOL result = [[NSFileManager defaultManager] copyItemAtURL:[NSURL fileURLWithPath:path] toURL:[NSURL fileURLWithPath:dest] error:&error];
     
     if(error == nil)