Re: [Podofo-users] PoDoFo cannot load some PDFs with XMP metadata

[Leonard R. <lro...@ad...>]

I haven’t looked at the code in Load() in a while, but I can’t think of a
reason that it is loading the XMP.  Are you SURE that this where the
exception is being thrown - XMP parsing??   I would think it’s somewhere
else in the PDF.  Can you post a sample?

Leonard

On 4/17/14, 9:47 PM, "Uli Zappe" <ul...@ri...> wrote:

>Hi,
>
>I found that PoDoFo 0.9.2. cannot load some PDFs with XMP metadata.
>
>In these cases, when PoDoFo::PdfMemDocument::Load() is called (I didn't
>try reading from a file), an exception is thrown with the error message
>"A number was expected but not found."
>
>Upon closer inspection of the affected PDFs, I found that in all these
>cases, the XMP packet header
>
>   <?xpacket begin='' id='W5M0MpCehiHzreSzNTczkc9d'?>
>
>contains no character between the quotes of
>
>   begin=''
>
>This is allowed according to Adobe's XMP specification. In
>http://wwwimages.adobe.com/www.adobe.com/content/dam/Adobe/en/devnet/xmp/p
>dfs/cc-201306/XMPSpecificationPart1.pdf on page 11, it says:
>
>> the character 􏰀 [the character between the quotes, U.Z.] represents
>>the Unicode character U+FEFF used as a byte-order marker. The U+FEFF may
>>be omitted from the begin="".
>
>
>The current version of PoDoFo, however, stumbles as soon as there is no
>character between the quotes.
>
>NOTE: Also contrary to Adobe's XMP specification (and the behavior of
>Adobe's XMP Toolkit SDK), PoDoFo seems to allow *any* character between
>the quotes of begin='', not only U+FEFF. However, I do feel that this is
>a *good thing* because it makes PoDoFo more fault tolerant. There seem to
>be several applications out there to write XMP data to PDFs, which don't
>get the packet header's U+FEFF character right. As a result, Adobe's XMP
>Toolkit SDK cannot read the XMP data of PDFs edited with these
>applications, while PoDoFo can. I consider this an advantage that should
>not be removed. (Specifically, there is a Java application from 2008
>(still linked from creativecommons.org) that writes Creative Commons
>licenses in such an incorrect XMP format to PDF files. PoDoFo recognizes
>these licenses, Adobe's XMP Toolkit does not.)
>
>Bye
>
>Uli
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