Corrupt PDFs

Hi Esteban,

Do those corrupted PDFs with size of 0 bytes? Or can't open and with normal size? If the former, I think you can add a retry mechanism to prevent it.

Duo

Can't open with the normal size is our situation.

Hi Esteban,

Have you already got a support ticket of it? Do you have an corrupted example where the PDF doesn't contain sensitive information, and also download an openable copy as a comparison?

Duo

Hi Duo. I attached the two files.

I have attached the original files.  If you open using Notepad++ you will see they are full of NULLS. 

Hi Esteban,

Thanks for the sharing! And true that seems every byte is NULL char for these two files:

        File file = new File("C:\\......\\Application for Refund-TRS6ES-636499.PDF");
        byte[] fileContent = Files.readAllBytes(file.toPath());
        
        for (byte b : fileContent) {
            System.out.println(b == '\u0000');
        }

I believe this provides a thread of thinking about how to test against the downloaded byte array:

         byte[] documentByte = eslClient.downloadDocument(new PackageId("package_id"), "documentId");

However, it's also possible that the corruption happened when processed the output stream storing the byte array to your local or a remote storage. Is it possible to share where you stored these data and the the code around how your application stores the downloaded byte array?

Duo

Hi Duo:

We are using java.io.FileOutputStream to write PDF file to a Windows network drive.

Does that help?

Hi Esteban,

I have few thoughts about it:

#1. You can add a retry mechanism in your code and detect if the downloaded byte array are full of null bytes / if the first char is '%', like below:

        EslClient eslClient = new EslClient(API_KEY, API_URL);
        
        int retry = 3;
        byte[] fileContent = null;
        while(retry-- > 0) {
            fileContent = eslClient.downloadDocument(new PackageId("dL0ACE8iwBQ7zzBQUfzgv-hLLB8="), "Document1");
            if(fileContent != null && (char)fileContent[0] == '%') {
                break;
            }
            
//            or
//            if(fileContent != null && fileContent[0] == '\u0000') {
//                continue;
//            }else {
//                break;
//            }
//            
        }

#2. You can also duplicate the downloaded byte array to a local drive and see if both locations experience the same

Duo

I'll go ahead and try the retry code with a minor modification to loop:

               int retry = 0;
                byte[] fileContent = null;
                while(retry < 3) {
                    fileContent = eslClient.downloadDocument(documentPackage.getId(), document.getId().getId());
                    if(fileContent != null && (char)fileContent[0] == '%') {
                     break;
                    }
                    retry++;
                }