<?php
/*
 * Associated files:
 * Attach associated files to various locations in the document:
 * - document
 * - pages
 * - Form XObjects, e.g. imported PDF pages and SVG graphics
 * - Image XObjects
 * 
 * The following locations are also possible, but are not demonstrated here:
 * - annotations
 * - structure element hierarchy
 * - structure elements
 * - marked content
 * - DPart (document part) node
 * - XMP metadata
 *
 * Required software: PDFlib/PDFlib+PDI/PPS 9
 * Required data: SVG graphics, image, PDF document,
 * suitable associated files (we use the same dummy text file for all objects)
 */

/* This is where the data files are. Adjust as necessary. */
$searchpath = dirname(__FILE__,3)."/input";

/* By default annotations are also imported. In some cases this
 * requires the Noto fonts for creating annotation appearance streams.
 * We therefore set the searchpath to also point to the font directory.
 */
$fontpath = dirname(__FILE__,3)."/resource/font";
$outfile = "";

$graphicsfile = "PDFlib-logo.svg";
$imagefile = "nesrin.jpg";
$pdffilename = "PDFlib-datasheet.pdf";

/* Dummy text file; could contain arbitrary contents */
$af_path = "af1.txt";

$x = 10; $y = 500;
$exitcode = 0;

try {
    $p = new PDFlib();

    $p->set_option("SearchPath=" . $searchpath);

    $p->set_option("SearchPath=" . $fontpath);

    /* This means we must check return values of load_graphics() etc. */
    $p->set_option("errorpolicy=return");

    $p->set_info("Creator", "PDFlib Cookbook");
    $p->set_info("Title", "associated_files");
    
    if ($p->begin_document($outfile, "compatibility=2.0") == 0)
        throw new Exception("Error: " . $p->get_errmsg());

    /* **********************************************************
    * Attach associated file to an image
    */
    $af = $p->load_asset("Attachment", $af_path, "mimetype=text/plain "
            . "description={Associated file for image} "
            . "relationship=Data documentattachment=true "
            . "name={af1}");

    if ($af == 0)
        throw new Exception("Error: " . $p->get_errmsg());

    $image = $p->load_image("auto", $imagefile, "associatedfiles={" . $af . "}");

    if ($image == -1)
        throw new Exception("Error: " . $p->get_errmsg());

    /* **********************************************************
    * Attach associated file to a page
    */
    $af = $p->load_asset("Attachment", $af_path, "mimetype=text/plain "
            . "description={Associated file for page} "
            . "relationship=Data documentattachment=true "
            . "name={af2}");

    if ($af == 0)
        throw new Exception("Error: " . $p->get_errmsg());

    $p->begin_page_ext(0, 0, "width=a4.width height=a4.height " 
            . "associatedfiles={" . $af . "}");
    
    $p->fit_image($image, 10, 10, "boxsize={400 400} position={center} fitmethod=meet");
    
    $p->close_image($image);
    $p->end_page_ext("");

    /* **********************************************************
    * Attach associated file to an imported PDF page
    */
    $af = $p->load_asset("Attachment", $af_path, "mimetype=text/plain "
            . "description={Associated file for imported PDF page} "
            . "relationship=Data documentattachment=true "
            . "name={af3}");

    if ($af == 0)
        throw new Exception("Error: " . $p->get_errmsg());

    /* Open the input PDF */
    $doc = $p->open_pdi_document($pdffilename, "");
    if ($doc == 0)
        throw new Exception("Error: " . $p->get_errmsg());
    
    $page = $p->open_pdi_page($doc, 1, "associatedfiles={" . $af . "}");

    if ($page == 0)
        throw new Exception("Error: " . $p->get_errmsg());
    
    $p->begin_page_ext(0, 0, "width=a4.width height=a4.height");
    
    $p->fit_pdi_page($page, 0, 0, "adjustpage");
    
    $p->close_pdi_page($page);
    $p->close_pdi_document($doc);
    $p->end_page_ext("");
    
    /* **********************************************************
    * Attach associated file to imported SVG graphics
    */            
    $p->begin_page_ext(0, 0, "width=a4.width height=a4.height");

    /* Attach associated file at Form XObject level */
    $af = $p->load_asset("Attachment", $af_path, "mimetype=text/plain "
            . "description={Associated file for SVG graphics} "
            . "relationship=Data documentattachment=true "
            . "name={af4}");

    if ($af == 0)
        throw new Exception("Error: " + $p->get_errmsg());

    /* Load the graphics */
    $graphics = $p->load_graphics("auto", $graphicsfile,
            "templateoptions={associatedfiles={" . $af . "}}");

    if ($graphics == -1)
        throw new Exception("Error: " . $p->get_errmsg());

    $optlist = "boxsize={400 400} position={center} fitmethod=meet";
    $p->fit_graphics($graphics, $x, $y, $optlist);

    $p->close_graphics($graphics);
    $p->end_page_ext("");
    
    /* **********************************************************
    * Attach associated file to the document
    */
    $af = $p->load_asset("Attachment", $af_path, "mimetype=text/plain "
            . "description={Associated file for document} "
            . "relationship=Data documentattachment=true "
            . "name={af5}");

    if ($af == -1)
        throw new Exception("Error: " . $p->get_errmsg());
    
    $p->end_document("associatedfiles={" . $af . "}");

    $buf = $p->get_buffer();
    $len = strlen($buf);

    header("Content-type: application/pdf");
    header("Content-Length: $len");
    header("Content-Disposition: inline; filename=associated_files.pdf");
    print $buf;
}
catch (PDFlibException $e) {
    echo("PDFlib exception occurred in associated_files sample:\n" .
        "[" . $e->get_errnum() . "] " . $e->get_apiname() . ": " .
        $e->get_errmsg() . "\n");
    exit(1);
}
catch (Throwable $e) {
    echo("PHP exception occurred: " . $e->getMessage() . "\n");
    exit(1);
}

$p = 0;
?>