[GitHub] [cordova-plugin-file] Jeremy38100 opened a new issue #341: Low performance when read large file with cordova-plugin-file

[GitBox <gi...@apache.org>]

Jeremy38100 opened a new issue #341: Low performance when read large file with cordova-plugin-file
URL: https://github.com/apache/cordova-plugin-file/issues/341
 
 
    am creating a hybrid app with Angular 7, Ionic 4 and Cordova.
   
   I need to read a large file (> 1GB) located on Android file system but i am facing a performance issue. With the current implementation i have a speed about **2.5 MB/sec**.
   
   Is it an issue with the plugin itself or the implementation ?
   
   I tried to modify BLOB_SIZE but the maximum speed i obtained was 2.5 MB/s.
   
   ```typescript
   const BLOB_SIZE = 1024*1024;
   
   usbRead(fileEntry: FileEntry) {
         fileEntry.file((file) => {
           const reader = new FileReader();
   
           reader.onload = () => {
             const buffer = new Uint8Array(reader.result as ArrayBuffer);
             readCounter += buffer.byteLength;
             console.log(textDecoder.decode(buffer));
             offset += BLOB_SIZE;
             if (offset >= file.size) {
               console.log('end');
               return;
             }
             const slice = file.slice(offset, offset + BLOB_SIZE);
             reader.readAsArrayBuffer(slice);
           };
   
           reader.readAsArrayBuffer(file.slice(0, BLOB_SIZE));
         });
       });
     }
   ```
   I tested on Xiaomi Redmi Note 7 with Android 9
   
   My package.json has the following plugin version :
   `@ionic-native/file": "^5.12.0"`
   
   - [x] I searched for existing GitHub issues
   - [x] I updated all Cordova tooling to most recent version
   - [x] I included all the necessary information above
   

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