[NTG-pdftex] [ pdftex-Feature Requests-89 ] Handle missing pages in included pdfs better

[noreply at sarovar.org]

Feature Requests item #89, was opened at 2004-07-08 14:38
You can respond by visiting: 
http://sarovar.org/tracker/?func=detail&atid=496&aid=89&group_id=106

Category: None
Group: v1.21
Status: Open
Resolution: None
Priority: 5
Submitted By: Martin Schröder (oneiros)
Assigned to: Nobody (None)
Summary: Handle missing pages in included pdfs better

Initial Comment:
Currently, when one tries to include page 10 of a 9
page document, pdftex quits.

Proposed change:

Behaviour of pdfTeX for pdf image inclusion:

UNKNOWN := -1
Initialization: \pdflastximagepages := UNKNOWN

Continue := Continue with empty xform object with
dimension 1bp x 1bp.
// 1bp because it avoids zero and possible problems and
// the output is small (/BBox [0 0 1 1])

if PDFFileExists
    if PageNumber < 1
        \pdflastximagepages = UNKNOWN
        Warning "Invalid page number"
        Continue
    elsif PageNumber > \pdflastximagepages
        \pdflastximagepages is set
        Warning "Page number to large (out of range)
        Continue
    else
        \pdflastximagepages is set
        image is included
    fi
else
    Warning "PDF file does not exist"
    \pdflastximagepages = UNKNOWN
    Continue
fi

Failure/Success checking:

if [page] < 1
    * Page number too small
elsif \pdflastximagepages = -1
    * PDF file does not exist
elsif [page] > \pdflastximagepages
    * Page number too large
else
    * Success
fi

or with optimization for success:

if [page] < 1
    * Page number too small
elsif [page] > \pdflastximagepages
    if \pdflastximagepages = -1
        * PDF file does not exist
    else
        * Page number too large
    fi
else
    * Success
fi

----------------------------------------------------------------------

You can respond by visiting: 
http://sarovar.org/tracker/?func=detail&atid=496&aid=89&group_id=106