Saving .jpg using @ionic-native/file seems to corrupt it somehow

No errors while running, but when viewing the resulting base64 in page the image is corrupt. The base64 string when reading the image after saving it is a lot longer than the one im asking it to save.

Related code:

this.pictureDir=this.file.dataDirectory+'pictures/';


     public saveImage(base64:string, name:string):Promise<string>{
    return new Promise((resolve, reject)=>{
      this.file.writeFile(this.pictureDir, name, base64, )
      .then((data)=>{
        resolve(this.pictureDir+name);
      })
      .catch((err)=>{
        console.log(err.message)
        reject(err);
      })
    })
  }
  public imgUriToBase64(imgUri:string):Promise<string>{
    return new Promise((resolve, reject)=>{
      let path:[string,string]=CatchService.splitUri(imgUri);
      this.file.readAsDataURL(path[0],path[1])
      .then((data)=>{
        resolve(data);
      })
      .catch((err)=>{
        console.log(err.message);
        reject(err);
      })
    })
  }


public static splitUri(imgUri:string):[string,string]{
    let path:string[]=new Array<string>();
    let file:string[]=new Array<string>();
    let fileFound:boolean=false;
    for(let i:number=imgUri.length-1;i>=0;i--){
      if(imgUri.charAt(i)=='/'){
        fileFound=true;
      }
      if(!fileFound){
        file.push(imgUri.charAt(i));
      }else{
        path.push(imgUri.charAt(i));
      }
    }
    let returnPath:string='';
    let returnFile:string='';
    for(let c of path){
      returnPath=c+returnPath;
    }
    for(let c of file){
      returnFile=c+returnFile;
    }
    return [returnPath, returnFile];
  }

Thanks for the help.
Sorry if wrong format etc, new to the forum

This is how far i have come:
The image is saved with the native camera app, then read in base64 with .readAsDataURL from File. This base64 i can show in my page with no problems.
Then i save the file to a picture folder with .writeFile. When using the resulting uri to show the file in my page, its corrupted.

Does .writeFile save a base64 encoded image correctly?

my base64 saving is bad, and I should feel bad.

my saveImage function is not how you save a base64 image at all, at least not withouth removing the “data:image/jpeg:base64,” prefix and maybe converting back to binary first, which im not going into right now.

solved my copying issues with @ionic-native/file’s .copyFile function

Still getting some weird errors when sending the base64 encoded image with json, but it might be a server related issue