[poppler] Bug 69485

[Adrian Johnson]

On 03/01/14 15:15, Ross Moore wrote:
> Hi Adrian,
> 
> On 03/01/2014, at 10:01 AM, Adrian Johnson wrote:
> 
>> Leonard,
>> Do you have any idea why Adobe Distiller fails on the PS output? The PS
>> files print fine on my Xerox printer which has Adobe PS.
> 
> The error occurs in the PostScript around lines  44378-44379.
> Comment out these 2 lines and the file will distill just fine.
> 
> The lines commented-out should look like:
> 
>>> % imagemask
>>> % Gar8O!!3<."p5&6Mu*H<lMpm`s8T;%s*la!#Nl!cb6!e-!5&ILgA~>
> 
> Of course this omits something on page 4.
> It is the red arrow indicating where a signature is required.
> 
> This seems to have been added over the top of the underlying form,
> using coding that looks a bit suspect to me.
> viz.
> 
>>> 8 dict dup begin
>>>   /ImageType 1 def
>>>   /Width 24 def
>>>   /Height 15 def
>>>   /Interpolate false def
>>>   /BitsPerComponent 1 def
>>>   /Decode [ 1 0 ] def
>>>   /DataSource currentfile /ASCII85Decode filter /FlateDecode filter def
>>>   /Interpolate false def
>>>   /ImageMatrix [ 1 0 0 -1 0 15 ] def
>>> end
>>> imagemask
>>> Gar8O!!3<."p5&6Mu*H<lMpm`s8T;%s*la!#Nl!cb6!e-!5&ILgA~>
> 
> Firstly there are 9 entries being defined within the dictionary,
>  but then /Interpolate is given twice.
> 
> The /DataSource  line looks quite wrong. 
>   "DataSource must be a single file, procedure, or string"
>    --- PS Ref. Manual v3
> so maybe this will do:   
>    /DataSource {currentfile /ASCII85Decode filter /FlateDecode filter} def
> but when testing the same /undefined  error occurs with  imagemask ,
> which could indicate something wrong in the preceding dictionary.

Thanks for finding those two issues. I'll update cairo to fix this.

I am unable to reproduce this problem myself so I will have to rely on
others to debug this. The only other thing I can think of is maybe there
is something in the encoded data that Distiller does not like. You could
try replacing the ASCII85 and Flate filters with a single ASCIIHexDecode
and replace the data with some hex characters ensuring there are the
right number of characters for the expected amount of data.


>>
>>
>> On 03/01/14 08:56, Leonard Rosenthol wrote:
>>> Prints just fine from Adobe Acrobat on both Mac and Win.
>>>
>>> I validated both files using the PDF syntax checker in Acrobat and they
>>> both passed fine.
>>>
>>> So there is nothing wrong with the PDFs in question.
>>>
>>> Leonard
> 
> 
> Hope this helps,
> 
> 	Ross
> 
> ------------------------------------------------------------------------
> Ross Moore                                       ross.moore at mq.edu.au 
> Mathematics Department                           office: E7A-206      
> Macquarie University                             tel: +61 (0)2 9850 8955
> Sydney, Australia  2109                          fax: +61 (0)2 9850 8114
> ------------------------------------------------------------------------
> 
> 
> 
> 
> 
> 
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