general/data_from_memory
Create a PVF file which holds an image or PDF and import the data from the PVF file.
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<?php
/*
* PDFlib Virtual File system (PVF):
* Create a PVF file which holds an image or PDF, and import the data from the
* PVF file
*
* This avoids disk access and is especially useful when the same image or PDF
* is imported multiply. For examples, images which sit in a database don't
* have to be written and re-read from disk, but can be passed to PDFlib
* directly in memory. A similar technique can be used for loading other data
* such as fonts, ICC profiles, etc.
*
* Required software: PDFlib/PDFlib+PDI/PPS 9
*/
/* Some constant SVG data as an example for fetching input data from memory */
$svgdata =
"<?xml version='1.0'?>
<svg viewBox='0 0 100 100' version='1.1' xmlns='http://www.w3.org/2000/svg'>
<circle cx='50' cy='50' r='40' fill='orange'/>
</svg>";
// This is where the data files are. Adjust as necessary.
$searchpath = dirname(__FILE__,3)."/input";
try {
// create a new PDFlib object
$p = new PDFlib();
$p->set_option("searchpath={" . $searchpath . "}");
// This means we must check return values of load_font() etc.
$p->set_option("errorpolicy=return");
// open new PDF file; insert a file name to create the PDF on disk
if ($p->begin_document("", "") == 0) {
echo("Error: " . $p->get_errmsg());
exit(1);
}
$p->set_info("Creator", "PDFlib Cookbook");
$p->set_info("Title", "PDFlib Virtual File System");
$p->create_pvf("/pvf/svg", $svgdata, "");
// Load the graphics from the PVF
$svg = $p->load_graphics("svg", "/pvf/svg", "");
if ($svg == 0) {
echo("Error: " . $p->get_errmsg());
exit(1);
}
// Fit the graphics on page 1
$p->begin_page_ext(0, 0, "width=a4.width height=a4.height");
$p->fit_graphics($svg, 350, 750, "");
$p->end_page_ext("");
// Fit the graphics on page 2
$p->begin_page_ext(0, 0, "width=a4.width height=a4.height");
$p->fit_graphics($svg, 350, 50, "");
$p->end_page_ext("");
// Delete the virtual file to free the allocated memory
$p->delete_pvf("/pvf/svg");
$p->end_document("");
$buf = $p->get_buffer();
$len = strlen($buf);
header("Content-type: application/pdf");
header("Content-Length: $len");
header("Content-Disposition: inline; filename=data_from_memory.pdf");
print $buf;
}
catch (PDFlibException $e) {
echo("PDFlib exception occurred:\n" .
"[" . $e->get_errnum() . "] " . $e->get_apiname() . ": " .
$e->get_errmsg() . "\n");
exit(1);
}
catch (Throwable $e) {
echo($e);
exit(1);
}
$p = 0;
?>