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SomePie
PostPosted: Wed Oct 18, 2023 11:02 am 
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Joined: Wed Oct 18, 2023 10:54 am
Posts: 7
The moment I try to open a readonly pdf document with the following method:

sourceDocument = PdfReader.Open(file, PdfDocumentOpenMode.ReadOnly);

I get the error
System.InvalidOperationException: 'The document cannot be modified.'
This so far only occorured with 1 single pdf file

The pdf I'm trying to open is the following pdf
https://dlcdnets.asus.com/pub/ASUS/mb/L ... V2_WEB.pdf

Am I doing something wrong or..?

with regards SomePie
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Thomas Hoevel
PostPosted: Wed Oct 18, 2023 11:30 am 
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Joined: Mon Oct 16, 2006 8:16 am
Posts: 3096
Location: Cologne, Germany
SomePie wrote:
Am I doing something wrong or..?
Well, the file is inconsistent: The PDF version is set to 1.7, but the encryption level is set to 5.
Encryption level 5 came with PDF 2.0, therefore PDFsharp tries to change the version to 2.0 - and this fails.

I think I'll change PDFsharp to not adjust the incorrect version number for files opened in ReadOnly mode. Will discuss this with my fellow worker.

Thanks for your feedback.
As a workaround, you could open the file in "modify" mode until the next release comes.

Update: File cannot be opened in Import mode, this leads to a different error message. I'll discuss this with my fellow worker, too.

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Thomas Hoevel
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SomePie
PostPosted: Wed Oct 18, 2023 11:36 am 
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Thomas Hoevel wrote:
SomePie wrote:
Am I doing something wrong or..?
Well, the file is inconsistent: The PDF version is set to 1.7, but the encryption level is set to 5.
Encryption level 5 came with PDF 2.0, therefore PDFsharp tries to change the version to 2.0 - and this fails.

I think I'll change PDFsharp to not adjust the incorrect version number for files opened in ReadOnly mode.

Thanks for your feedback.
As a workaround, you could open the file in "modify" mode until the next release comes.


Thanks for your quick reply, though the modify mode would only be possible if I had the actual password for this one

with regards,
SomePie
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Thomas Hoevel
PostPosted: Wed Oct 18, 2023 11:42 am 
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Location: Cologne, Germany
SomePie wrote:
Thanks for your quick reply, though the modify mode would only be possible if I had the actual password for this one
I already noticed that.
Will discuss this with my fellow worker. Encryption is not my area of expertise.

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Thomas Hoevel
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Thomas Hoevel
PostPosted: Wed Oct 18, 2023 12:00 pm 
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Location: Cologne, Germany
I made a change to SetRequiredVersion in PdfDocument.
Here's the change if you want to try it out:

Code:
        /// <summary>
        /// Adjusts the version if the current version is lower than the required version.
        /// Version is not adjusted for inconsistent files in ReadOnly mode.
        /// </summary>
        /// <param name="requiredVersion">The minimum version number to set version to.</param>
        /// <returns>True, if Version was modified.</returns>
        public bool SetRequiredVersion(int requiredVersion)
        {
            if (requiredVersion > Version && CanModify)
            {
                Version = requiredVersion;
                return true;
            }

            return false;
        }

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SomePie
PostPosted: Wed Oct 18, 2023 1:26 pm 
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Posts: 7
Thomas Hoevel wrote:
I made a change to SetRequiredVersion in PdfDocument.
Here's the change if you want to try it out:

Code:
        /// <summary>
        /// Adjusts the version if the current version is lower than the required version.
        /// Version is not adjusted for inconsistent files in ReadOnly mode.
        /// </summary>
        /// <param name="requiredVersion">The minimum version number to set version to.</param>
        /// <returns>True, if Version was modified.</returns>
        public bool SetRequiredVersion(int requiredVersion)
        {
            if (requiredVersion > Version && CanModify)
            {
                Version = requiredVersion;
                return true;
            }

            return false;
        }


I'll pull the repo later on this week and try this change in it! thank you
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SomePie
PostPosted: Fri Oct 20, 2023 10:33 am 
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Joined: Wed Oct 18, 2023 10:54 am
Posts: 7
Thomas Hoevel wrote:
I made a change to SetRequiredVersion in PdfDocument.
Here's the change if you want to try it out:

Code:
        /// <summary>
        /// Adjusts the version if the current version is lower than the required version.
        /// Version is not adjusted for inconsistent files in ReadOnly mode.
        /// </summary>
        /// <param name="requiredVersion">The minimum version number to set version to.</param>
        /// <returns>True, if Version was modified.</returns>
        public bool SetRequiredVersion(int requiredVersion)
        {
            if (requiredVersion > Version && CanModify)
            {
                Version = requiredVersion;
                return true;
            }

            return false;
        }


I downloaded the repo, added the change in
'PdfSharp\src\foundation\src\PDFsharp\src\PdfSharp\Pdf\PdfDocument.cs'

built the dll, replaced it in the debug of my project after rebuilding, same error still comes up

did I miss a step?

[edit]
When I try
Code:
form = XPdfForm.FromFile(file);

and then read the form.PageCount the same error applies
[/edit]
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