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https://issues.apache.org/jira/browse/PDFBOX-4312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16620995#comment-16620995
 ] 

Tilman Hausherr edited comment on PDFBOX-4312 at 9/19/18 6:22 PM:
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So I was able to reproduce the effect, see attached files. This code
{code:java}
    public void saveIncremental( String fileName ) throws IOException, 
COSVisitorException
    {
        saveIncremental(new BufferedInputStream(new FileInputStream(fileName)), 
                new BufferedOutputStream(new FileOutputStream(fileName, true)));
    }
{code}
is suspicious, because one is writing on the same file than the one where one 
is writing, but I'm not sure is the writing start offset is really correct. 
Likely the solution would be to read the input into a buffer first and to pass 
that one.


was (Author: tilman):
So I was able to reproduce the effect. This code
{code:java}
    public void saveIncremental( String fileName ) throws IOException, 
COSVisitorException
    {
        saveIncremental(new BufferedInputStream(new FileInputStream(fileName)), 
                new BufferedOutputStream(new FileOutputStream(fileName, true)));
    }
{code}
is suspicious, because one is writing on the same file than the one where one 
is writing, but I'm not sure is the writing start offset is really correct. 
Likely the solution would be to read the input into a buffer first and to pass 
that one.

> byte array format to pass to sign method
> ----------------------------------------
>
>                 Key: PDFBOX-4312
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4312
>             Project: PDFBox
>          Issue Type: Wish
>          Components: .NET, PDModel, Signing
>    Affects Versions: 1.8.9
>            Reporter: bal
>            Priority: Major
>         Attachments: Screenshot (30).png, Screenshot (31).png, Screenshot 
> (31).png, testingSignature-signed-SaveIncremental-1param-bad-cutoff.pdf, 
> testingSignature-signed-SaveIncremental-2param-good.pdf, 
> testingSignature.pdf, testingSignature.pdf
>
>
> Hi ,
> I want to sign pdf using signature in pkcs 7 format . I am converting pkcs 7 
> signature to byte array using Convert.FromBase64String method in .net . I am 
> passing this byte array to sign method in signature interface which gets 
> called after calling saveincremental. My byte array is inserting proper but 
> the name of which signature is not shown when i open pdf. May be my byte 
> conversion may not proper or something else i am doing wrong. please let me 
> know.



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