pdfmerge.rs

#[macro_use]
extern crate lopdf;

use std::io::Result;

use lopdf::content::{Content, Operation};
use lopdf::{Document, Object, Stream};

pub fn do_it() -> Result<()> {
    let mut doc = Document::with_version("1.5");
    doc.change_producer("PDFMERGE-RS");
    let mut input1 = Document::load("test-data/input1.pdf")?;
    let pages = input1.get_pages();

    for page in pages.iter() {
        let key = page.0;
        let objectid = page.1;
        println!("key: {}, objectid: {:?}", key, objectid);
    }

    let page_1 = pages.get(&1).unwrap();
    let page_1_content = input1.get_and_decode_page_content(*page_1);

    let pages_id = doc.new_object_id();
    let content_id = doc.add_object(Stream::new(
        dictionary!{},
        page_1_content.clone().encode().unwrap(),
    ));
    let page_id = doc.add_object(dictionary! {
        "Type" => "Page",
        "Parent" => pages_id,
        "Contents" => content_id,
    });
    let resources_id = doc.add_object(dictionary!{});
    let pages = dictionary! {
        "Type" => "Pages",
        "Kids" => vec![page_id.into()],
        "Count" => 1,
        "Resources" => resources_id,
        "MediaBox" => vec![0.into(), 0.into(), 595.into(), 842.into()],
    };
    doc.objects.insert(pages_id, Object::Dictionary(pages));
    let catalog_id = doc.add_object(dictionary! {
        "Type" => "Catalog",
        "Pages" => pages_id,
    });
    doc.trailer.set("Root", catalog_id);
    doc.compress();
    doc.save("example.pdf").unwrap();
    Ok(())
}

fn main() {
    do_it().expect("Failed pdf");
}